| /* |
| * Copyright (c) 1994, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.lang; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.module.ModuleReader; |
| import java.lang.reflect.AnnotatedElement; |
| import java.lang.reflect.Array; |
| import java.lang.reflect.GenericArrayType; |
| import java.lang.reflect.GenericDeclaration; |
| import java.lang.reflect.Member; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Executable; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Module; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.Type; |
| import java.lang.reflect.TypeVariable; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.AnnotatedType; |
| import java.lang.reflect.Proxy; |
| import java.lang.ref.SoftReference; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.ObjectStreamField; |
| import java.net.URL; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.Map; |
| import java.util.HashMap; |
| import java.util.Objects; |
| import java.util.StringJoiner; |
| import jdk.internal.HotSpotIntrinsicCandidate; |
| import jdk.internal.loader.BootLoader; |
| import jdk.internal.loader.BuiltinClassLoader; |
| import jdk.internal.misc.Unsafe; |
| import jdk.internal.misc.VM; |
| import sun.reflect.CallerSensitive; |
| import sun.reflect.ConstantPool; |
| import sun.reflect.Reflection; |
| import sun.reflect.ReflectionFactory; |
| import sun.reflect.generics.factory.CoreReflectionFactory; |
| import sun.reflect.generics.factory.GenericsFactory; |
| import sun.reflect.generics.repository.ClassRepository; |
| import sun.reflect.generics.repository.MethodRepository; |
| import sun.reflect.generics.repository.ConstructorRepository; |
| import sun.reflect.generics.scope.ClassScope; |
| import sun.security.util.SecurityConstants; |
| import sun.reflect.annotation.*; |
| import sun.reflect.misc.ReflectUtil; |
| |
| /** |
| * Instances of the class {@code Class} represent classes and |
| * interfaces in a running Java application. An enum is a kind of |
| * class and an annotation is a kind of interface. Every array also |
| * belongs to a class that is reflected as a {@code Class} object |
| * that is shared by all arrays with the same element type and number |
| * of dimensions. The primitive Java types ({@code boolean}, |
| * {@code byte}, {@code char}, {@code short}, |
| * {@code int}, {@code long}, {@code float}, and |
| * {@code double}), and the keyword {@code void} are also |
| * represented as {@code Class} objects. |
| * |
| * <p> {@code Class} has no public constructor. Instead {@code Class} |
| * objects are constructed automatically by the Java Virtual Machine as classes |
| * are loaded and by calls to the {@code defineClass} method in the class |
| * loader. |
| * |
| * <p> The following example uses a {@code Class} object to print the |
| * class name of an object: |
| * |
| * <blockquote><pre> |
| * void printClassName(Object obj) { |
| * System.out.println("The class of " + obj + |
| * " is " + obj.getClass().getName()); |
| * } |
| * </pre></blockquote> |
| * |
| * <p> It is also possible to get the {@code Class} object for a named |
| * type (or for void) using a class literal. See Section 15.8.2 of |
| * <cite>The Java™ Language Specification</cite>. |
| * For example: |
| * |
| * <blockquote> |
| * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} |
| * </blockquote> |
| * |
| * @param <T> the type of the class modeled by this {@code Class} |
| * object. For example, the type of {@code String.class} is {@code |
| * Class<String>}. Use {@code Class<?>} if the class being modeled is |
| * unknown. |
| * |
| * @author unascribed |
| * @see java.lang.ClassLoader#defineClass(byte[], int, int) |
| * @since 1.0 |
| */ |
| public final class Class<T> implements java.io.Serializable, |
| GenericDeclaration, |
| Type, |
| AnnotatedElement { |
| private static final int ANNOTATION= 0x00002000; |
| private static final int ENUM = 0x00004000; |
| private static final int SYNTHETIC = 0x00001000; |
| |
| private static native void registerNatives(); |
| static { |
| registerNatives(); |
| } |
| |
| /* |
| * Private constructor. Only the Java Virtual Machine creates Class objects. |
| * This constructor is not used and prevents the default constructor being |
| * generated. |
| */ |
| private Class(ClassLoader loader, Class<?> arrayComponentType) { |
| // Initialize final field for classLoader. The initialization value of non-null |
| // prevents future JIT optimizations from assuming this final field is null. |
| classLoader = loader; |
| componentType = arrayComponentType; |
| } |
| |
| /** |
| * Converts the object to a string. The string representation is the |
| * string "class" or "interface", followed by a space, and then by the |
| * fully qualified name of the class in the format returned by |
| * {@code getName}. If this {@code Class} object represents a |
| * primitive type, this method returns the name of the primitive type. If |
| * this {@code Class} object represents void this method returns |
| * "void". If this {@code Class} object represents an array type, |
| * this method returns "class " followed by {@code getName}. |
| * |
| * @return a string representation of this class object. |
| */ |
| public String toString() { |
| return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) |
| + getName(); |
| } |
| |
| /** |
| * Returns a string describing this {@code Class}, including |
| * information about modifiers and type parameters. |
| * |
| * The string is formatted as a list of type modifiers, if any, |
| * followed by the kind of type (empty string for primitive types |
| * and {@code class}, {@code enum}, {@code interface}, or |
| * <code>@</code>{@code interface}, as appropriate), followed |
| * by the type's name, followed by an angle-bracketed |
| * comma-separated list of the type's type parameters, if any. |
| * |
| * A space is used to separate modifiers from one another and to |
| * separate any modifiers from the kind of type. The modifiers |
| * occur in canonical order. If there are no type parameters, the |
| * type parameter list is elided. |
| * |
| * For an array type, the string starts with the type name, |
| * followed by an angle-bracketed comma-separated list of the |
| * type's type parameters, if any, followed by a sequence of |
| * {@code []} characters, one set of brackets per dimension of |
| * the array. |
| * |
| * <p>Note that since information about the runtime representation |
| * of a type is being generated, modifiers not present on the |
| * originating source code or illegal on the originating source |
| * code may be present. |
| * |
| * @return a string describing this {@code Class}, including |
| * information about modifiers and type parameters |
| * |
| * @since 1.8 |
| */ |
| public String toGenericString() { |
| if (isPrimitive()) { |
| return toString(); |
| } else { |
| StringBuilder sb = new StringBuilder(); |
| Class<?> component = this; |
| int arrayDepth = 0; |
| |
| if (isArray()) { |
| do { |
| arrayDepth++; |
| component = component.getComponentType(); |
| } while (component.isArray()); |
| sb.append(component.getName()); |
| } else { |
| // Class modifiers are a superset of interface modifiers |
| int modifiers = getModifiers() & Modifier.classModifiers(); |
| if (modifiers != 0) { |
| sb.append(Modifier.toString(modifiers)); |
| sb.append(' '); |
| } |
| |
| if (isAnnotation()) { |
| sb.append('@'); |
| } |
| if (isInterface()) { // Note: all annotation types are interfaces |
| sb.append("interface"); |
| } else { |
| if (isEnum()) |
| sb.append("enum"); |
| else |
| sb.append("class"); |
| } |
| sb.append(' '); |
| sb.append(getName()); |
| } |
| |
| TypeVariable<?>[] typeparms = component.getTypeParameters(); |
| if (typeparms.length > 0) { |
| boolean first = true; |
| sb.append('<'); |
| for(TypeVariable<?> typeparm: typeparms) { |
| if (!first) |
| sb.append(','); |
| sb.append(typeparm.getTypeName()); |
| first = false; |
| } |
| sb.append('>'); |
| } |
| |
| for (int i = 0; i < arrayDepth; i++) |
| sb.append("[]"); |
| |
| return sb.toString(); |
| } |
| } |
| |
| /** |
| * Returns the {@code Class} object associated with the class or |
| * interface with the given string name. Invoking this method is |
| * equivalent to: |
| * |
| * <blockquote> |
| * {@code Class.forName(className, true, currentLoader)} |
| * </blockquote> |
| * |
| * where {@code currentLoader} denotes the defining class loader of |
| * the current class. |
| * |
| * <p> For example, the following code fragment returns the |
| * runtime {@code Class} descriptor for the class named |
| * {@code java.lang.Thread}: |
| * |
| * <blockquote> |
| * {@code Class t = Class.forName("java.lang.Thread")} |
| * </blockquote> |
| * <p> |
| * A call to {@code forName("X")} causes the class named |
| * {@code X} to be initialized. |
| * |
| * @param className the fully qualified name of the desired class. |
| * @return the {@code Class} object for the class with the |
| * specified name. |
| * @exception LinkageError if the linkage fails |
| * @exception ExceptionInInitializerError if the initialization provoked |
| * by this method fails |
| * @exception ClassNotFoundException if the class cannot be located |
| */ |
| @CallerSensitive |
| public static Class<?> forName(String className) |
| throws ClassNotFoundException { |
| Class<?> caller = Reflection.getCallerClass(); |
| return forName0(className, true, ClassLoader.getClassLoader(caller), caller); |
| } |
| |
| |
| /** |
| * Returns the {@code Class} object associated with the class or |
| * interface with the given string name, using the given class loader. |
| * Given the fully qualified name for a class or interface (in the same |
| * format returned by {@code getName}) this method attempts to |
| * locate, load, and link the class or interface. The specified class |
| * loader is used to load the class or interface. If the parameter |
| * {@code loader} is null, the class is loaded through the bootstrap |
| * class loader. The class is initialized only if the |
| * {@code initialize} parameter is {@code true} and if it has |
| * not been initialized earlier. |
| * |
| * <p> If {@code name} denotes a primitive type or void, an attempt |
| * will be made to locate a user-defined class in the unnamed package whose |
| * name is {@code name}. Therefore, this method cannot be used to |
| * obtain any of the {@code Class} objects representing primitive |
| * types or void. |
| * |
| * <p> If {@code name} denotes an array class, the component type of |
| * the array class is loaded but not initialized. |
| * |
| * <p> For example, in an instance method the expression: |
| * |
| * <blockquote> |
| * {@code Class.forName("Foo")} |
| * </blockquote> |
| * |
| * is equivalent to: |
| * |
| * <blockquote> |
| * {@code Class.forName("Foo", true, this.getClass().getClassLoader())} |
| * </blockquote> |
| * |
| * Note that this method throws errors related to loading, linking or |
| * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The |
| * Java Language Specification</em>. |
| * Note that this method does not check whether the requested class |
| * is accessible to its caller. |
| * |
| * <p> If the {@code loader} is {@code null}, and a security |
| * manager is present, and the caller's class loader is not null, then this |
| * method calls the security manager's {@code checkPermission} method |
| * with a {@code RuntimePermission("getClassLoader")} permission to |
| * ensure it's ok to access the bootstrap class loader. |
| * |
| * @param name fully qualified name of the desired class |
| * @param initialize if {@code true} the class will be initialized. |
| * See Section 12.4 of <em>The Java Language Specification</em>. |
| * @param loader class loader from which the class must be loaded |
| * @return class object representing the desired class |
| * |
| * @exception LinkageError if the linkage fails |
| * @exception ExceptionInInitializerError if the initialization provoked |
| * by this method fails |
| * @exception ClassNotFoundException if the class cannot be located by |
| * the specified class loader |
| * |
| * @see java.lang.Class#forName(String) |
| * @see java.lang.ClassLoader |
| * @since 1.2 |
| */ |
| @CallerSensitive |
| public static Class<?> forName(String name, boolean initialize, |
| ClassLoader loader) |
| throws ClassNotFoundException |
| { |
| Class<?> caller = null; |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| // Reflective call to get caller class is only needed if a security manager |
| // is present. Avoid the overhead of making this call otherwise. |
| caller = Reflection.getCallerClass(); |
| if (VM.isSystemDomainLoader(loader)) { |
| ClassLoader ccl = ClassLoader.getClassLoader(caller); |
| if (!VM.isSystemDomainLoader(ccl)) { |
| sm.checkPermission( |
| SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| } |
| } |
| } |
| return forName0(name, initialize, loader, caller); |
| } |
| |
| /** Called after security check for system loader access checks have been made. */ |
| private static native Class<?> forName0(String name, boolean initialize, |
| ClassLoader loader, |
| Class<?> caller) |
| throws ClassNotFoundException; |
| |
| |
| /** |
| * Returns the {@code Class} with the given <a href="ClassLoader.html#name"> |
| * binary name</a> in the given module. |
| * |
| * <p> This method attempts to locate, load, and link the class or interface. |
| * It does not run the class initializer. If the class is not found, this |
| * method returns {@code null}. </p> |
| * |
| * <p> If the class loader of the given module defines other modules and |
| * the given name is a class defined in a different module, this method |
| * returns {@code null} after the class is loaded. </p> |
| * |
| * <p> This method does not check whether the requested class is |
| * accessible to its caller. </p> |
| * |
| * @apiNote |
| * This method returns {@code null} on failure rather than |
| * throwing a {@link ClassNotFoundException}, as is done by |
| * the {@link #forName(String, boolean, ClassLoader)} method. |
| * The security check is a stack-based permission check if the caller |
| * loads a class in another module. |
| * |
| * @param module A module |
| * @param name The <a href="ClassLoader.html#name">binary name</a> |
| * of the class |
| * @return {@code Class} object of the given name defined in the given module; |
| * {@code null} if not found. |
| * |
| * @throws NullPointerException if the given module or name is {@code null} |
| * |
| * @throws LinkageError if the linkage fails |
| * |
| * @throws SecurityException |
| * <ul> |
| * <li> if the caller is not the specified module and |
| * {@code RuntimePermission("getClassLoader")} permission is denied; or</li> |
| * <li> access to the module content is denied. For example, |
| * permission check will be performed when a class loader calls |
| * {@link ModuleReader#open(String)} to read the bytes of a class file |
| * in a module.</li> |
| * </ul> |
| * |
| * @since 9 |
| */ |
| @CallerSensitive |
| public static Class<?> forName(Module module, String name) { |
| Objects.requireNonNull(module); |
| Objects.requireNonNull(name); |
| |
| Class<?> caller = Reflection.getCallerClass(); |
| if (caller != null && caller.getModule() != module) { |
| // if caller is null, Class.forName is the last java frame on the stack. |
| // java.base has all permissions |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| } |
| } |
| |
| PrivilegedAction<ClassLoader> pa = module::getClassLoader; |
| ClassLoader cl = AccessController.doPrivileged(pa); |
| if (module.isNamed() && cl != null) { |
| return cl.loadLocalClass(module, name); |
| } |
| |
| final Class<?> c; |
| if (cl != null) { |
| c = cl.loadLocalClass(name); |
| } else { |
| c = BootLoader.loadClassOrNull(name); |
| } |
| |
| if (c != null && c.getModule() == module) { |
| return c; |
| } else { |
| return null; |
| } |
| } |
| |
| /** |
| * Creates a new instance of the class represented by this {@code Class} |
| * object. The class is instantiated as if by a {@code new} |
| * expression with an empty argument list. The class is initialized if it |
| * has not already been initialized. |
| * |
| * <p>Note that this method propagates any exception thrown by the |
| * nullary constructor, including a checked exception. Use of |
| * this method effectively bypasses the compile-time exception |
| * checking that would otherwise be performed by the compiler. |
| * The {@link |
| * java.lang.reflect.Constructor#newInstance(java.lang.Object...) |
| * Constructor.newInstance} method avoids this problem by wrapping |
| * any exception thrown by the constructor in a (checked) {@link |
| * java.lang.reflect.InvocationTargetException}. |
| * |
| * @return a newly allocated instance of the class represented by this |
| * object. |
| * @throws IllegalAccessException if the class or its nullary |
| * constructor is not accessible. |
| * @throws InstantiationException |
| * if this {@code Class} represents an abstract class, |
| * an interface, an array class, a primitive type, or void; |
| * or if the class has no nullary constructor; |
| * or if the instantiation fails for some other reason. |
| * @throws ExceptionInInitializerError if the initialization |
| * provoked by this method fails. |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| */ |
| @CallerSensitive |
| public T newInstance() |
| throws InstantiationException, IllegalAccessException |
| { |
| if (System.getSecurityManager() != null) { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false); |
| } |
| |
| // NOTE: the following code may not be strictly correct under |
| // the current Java memory model. |
| |
| // Constructor lookup |
| if (cachedConstructor == null) { |
| if (this == Class.class) { |
| throw new IllegalAccessException( |
| "Can not call newInstance() on the Class for java.lang.Class" |
| ); |
| } |
| try { |
| Class<?>[] empty = {}; |
| final Constructor<T> c = getConstructor0(empty, Member.DECLARED); |
| // Disable accessibility checks on the constructor |
| // since we have to do the security check here anyway |
| // (the stack depth is wrong for the Constructor's |
| // security check to work) |
| java.security.AccessController.doPrivileged( |
| new java.security.PrivilegedAction<>() { |
| public Void run() { |
| c.setAccessible(true); |
| return null; |
| } |
| }); |
| cachedConstructor = c; |
| } catch (NoSuchMethodException e) { |
| throw (InstantiationException) |
| new InstantiationException(getName()).initCause(e); |
| } |
| } |
| Constructor<T> tmpConstructor = cachedConstructor; |
| // Security check (same as in java.lang.reflect.Constructor) |
| Class<?> caller = Reflection.getCallerClass(); |
| if (newInstanceCallerCache != caller) { |
| int modifiers = tmpConstructor.getModifiers(); |
| Reflection.ensureMemberAccess(caller, this, null, modifiers); |
| newInstanceCallerCache = caller; |
| } |
| // Run constructor |
| try { |
| return tmpConstructor.newInstance((Object[])null); |
| } catch (InvocationTargetException e) { |
| Unsafe.getUnsafe().throwException(e.getTargetException()); |
| // Not reached |
| return null; |
| } |
| } |
| private transient volatile Constructor<T> cachedConstructor; |
| private transient volatile Class<?> newInstanceCallerCache; |
| |
| |
| /** |
| * Determines if the specified {@code Object} is assignment-compatible |
| * with the object represented by this {@code Class}. This method is |
| * the dynamic equivalent of the Java language {@code instanceof} |
| * operator. The method returns {@code true} if the specified |
| * {@code Object} argument is non-null and can be cast to the |
| * reference type represented by this {@code Class} object without |
| * raising a {@code ClassCastException.} It returns {@code false} |
| * otherwise. |
| * |
| * <p> Specifically, if this {@code Class} object represents a |
| * declared class, this method returns {@code true} if the specified |
| * {@code Object} argument is an instance of the represented class (or |
| * of any of its subclasses); it returns {@code false} otherwise. If |
| * this {@code Class} object represents an array class, this method |
| * returns {@code true} if the specified {@code Object} argument |
| * can be converted to an object of the array class by an identity |
| * conversion or by a widening reference conversion; it returns |
| * {@code false} otherwise. If this {@code Class} object |
| * represents an interface, this method returns {@code true} if the |
| * class or any superclass of the specified {@code Object} argument |
| * implements this interface; it returns {@code false} otherwise. If |
| * this {@code Class} object represents a primitive type, this method |
| * returns {@code false}. |
| * |
| * @param obj the object to check |
| * @return true if {@code obj} is an instance of this class |
| * |
| * @since 1.1 |
| */ |
| @HotSpotIntrinsicCandidate |
| public native boolean isInstance(Object obj); |
| |
| |
| /** |
| * Determines if the class or interface represented by this |
| * {@code Class} object is either the same as, or is a superclass or |
| * superinterface of, the class or interface represented by the specified |
| * {@code Class} parameter. It returns {@code true} if so; |
| * otherwise it returns {@code false}. If this {@code Class} |
| * object represents a primitive type, this method returns |
| * {@code true} if the specified {@code Class} parameter is |
| * exactly this {@code Class} object; otherwise it returns |
| * {@code false}. |
| * |
| * <p> Specifically, this method tests whether the type represented by the |
| * specified {@code Class} parameter can be converted to the type |
| * represented by this {@code Class} object via an identity conversion |
| * or via a widening reference conversion. See <em>The Java Language |
| * Specification</em>, sections 5.1.1 and 5.1.4 , for details. |
| * |
| * @param cls the {@code Class} object to be checked |
| * @return the {@code boolean} value indicating whether objects of the |
| * type {@code cls} can be assigned to objects of this class |
| * @exception NullPointerException if the specified Class parameter is |
| * null. |
| * @since 1.1 |
| */ |
| @HotSpotIntrinsicCandidate |
| public native boolean isAssignableFrom(Class<?> cls); |
| |
| |
| /** |
| * Determines if the specified {@code Class} object represents an |
| * interface type. |
| * |
| * @return {@code true} if this object represents an interface; |
| * {@code false} otherwise. |
| */ |
| @HotSpotIntrinsicCandidate |
| public native boolean isInterface(); |
| |
| |
| /** |
| * Determines if this {@code Class} object represents an array class. |
| * |
| * @return {@code true} if this object represents an array class; |
| * {@code false} otherwise. |
| * @since 1.1 |
| */ |
| @HotSpotIntrinsicCandidate |
| public native boolean isArray(); |
| |
| |
| /** |
| * Determines if the specified {@code Class} object represents a |
| * primitive type. |
| * |
| * <p> There are nine predefined {@code Class} objects to represent |
| * the eight primitive types and void. These are created by the Java |
| * Virtual Machine, and have the same names as the primitive types that |
| * they represent, namely {@code boolean}, {@code byte}, |
| * {@code char}, {@code short}, {@code int}, |
| * {@code long}, {@code float}, and {@code double}. |
| * |
| * <p> These objects may only be accessed via the following public static |
| * final variables, and are the only {@code Class} objects for which |
| * this method returns {@code true}. |
| * |
| * @return true if and only if this class represents a primitive type |
| * |
| * @see java.lang.Boolean#TYPE |
| * @see java.lang.Character#TYPE |
| * @see java.lang.Byte#TYPE |
| * @see java.lang.Short#TYPE |
| * @see java.lang.Integer#TYPE |
| * @see java.lang.Long#TYPE |
| * @see java.lang.Float#TYPE |
| * @see java.lang.Double#TYPE |
| * @see java.lang.Void#TYPE |
| * @since 1.1 |
| */ |
| @HotSpotIntrinsicCandidate |
| public native boolean isPrimitive(); |
| |
| /** |
| * Returns true if this {@code Class} object represents an annotation |
| * type. Note that if this method returns true, {@link #isInterface()} |
| * would also return true, as all annotation types are also interfaces. |
| * |
| * @return {@code true} if this class object represents an annotation |
| * type; {@code false} otherwise |
| * @since 1.5 |
| */ |
| public boolean isAnnotation() { |
| return (getModifiers() & ANNOTATION) != 0; |
| } |
| |
| /** |
| * Returns {@code true} if this class is a synthetic class; |
| * returns {@code false} otherwise. |
| * @return {@code true} if and only if this class is a synthetic class as |
| * defined by the Java Language Specification. |
| * @jls 13.1 The Form of a Binary |
| * @since 1.5 |
| */ |
| public boolean isSynthetic() { |
| return (getModifiers() & SYNTHETIC) != 0; |
| } |
| |
| /** |
| * Returns the name of the entity (class, interface, array class, |
| * primitive type, or void) represented by this {@code Class} object, |
| * as a {@code String}. |
| * |
| * <p> If this class object represents a reference type that is not an |
| * array type then the binary name of the class is returned, as specified |
| * by |
| * <cite>The Java™ Language Specification</cite>. |
| * |
| * <p> If this class object represents a primitive type or void, then the |
| * name returned is a {@code String} equal to the Java language |
| * keyword corresponding to the primitive type or void. |
| * |
| * <p> If this class object represents a class of arrays, then the internal |
| * form of the name consists of the name of the element type preceded by |
| * one or more '{@code [}' characters representing the depth of the array |
| * nesting. The encoding of element type names is as follows: |
| * |
| * <blockquote><table summary="Element types and encodings"> |
| * <tr><th> Element Type <th> <th> Encoding |
| * <tr><td> boolean <td> <td align=center> Z |
| * <tr><td> byte <td> <td align=center> B |
| * <tr><td> char <td> <td align=center> C |
| * <tr><td> class or interface |
| * <td> <td align=center> L<i>classname</i>; |
| * <tr><td> double <td> <td align=center> D |
| * <tr><td> float <td> <td align=center> F |
| * <tr><td> int <td> <td align=center> I |
| * <tr><td> long <td> <td align=center> J |
| * <tr><td> short <td> <td align=center> S |
| * </table></blockquote> |
| * |
| * <p> The class or interface name <i>classname</i> is the binary name of |
| * the class specified above. |
| * |
| * <p> Examples: |
| * <blockquote><pre> |
| * String.class.getName() |
| * returns "java.lang.String" |
| * byte.class.getName() |
| * returns "byte" |
| * (new Object[3]).getClass().getName() |
| * returns "[Ljava.lang.Object;" |
| * (new int[3][4][5][6][7][8][9]).getClass().getName() |
| * returns "[[[[[[[I" |
| * </pre></blockquote> |
| * |
| * @return the name of the class or interface |
| * represented by this object. |
| */ |
| public String getName() { |
| String name = this.name; |
| if (name == null) |
| this.name = name = getName0(); |
| return name; |
| } |
| |
| // cache the name to reduce the number of calls into the VM |
| private transient String name; |
| private native String getName0(); |
| |
| /** |
| * Returns the class loader for the class. Some implementations may use |
| * null to represent the bootstrap class loader. This method will return |
| * null in such implementations if this class was loaded by the bootstrap |
| * class loader. |
| * |
| * <p> If a security manager is present, and the caller's class loader is |
| * not null and the caller's class loader is not the same as or an ancestor of |
| * the class loader for the class whose class loader is requested, then |
| * this method calls the security manager's {@code checkPermission} |
| * method with a {@code RuntimePermission("getClassLoader")} |
| * permission to ensure it's ok to access the class loader for the class. |
| * |
| * <p>If this object |
| * represents a primitive type or void, null is returned. |
| * |
| * @return the class loader that loaded the class or interface |
| * represented by this object. |
| * @throws SecurityException |
| * if a security manager exists and its |
| * {@code checkPermission} method denies |
| * access to the class loader for the class. |
| * @see java.lang.ClassLoader |
| * @see SecurityManager#checkPermission |
| * @see java.lang.RuntimePermission |
| */ |
| @CallerSensitive |
| public ClassLoader getClassLoader() { |
| ClassLoader cl = getClassLoader0(); |
| if (cl == null) |
| return null; |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass()); |
| } |
| return cl; |
| } |
| |
| // Package-private to allow ClassLoader access |
| ClassLoader getClassLoader0() { return classLoader; } |
| |
| /** |
| * Returns the module that this class or interface is a member of. |
| * |
| * If this class represents an array type then this method returns the |
| * {@code Module} for the element type. If this class represents a |
| * primitive type or void, then the {@code Module} object for the |
| * {@code java.base} module is returned. |
| * |
| * If this class is in an unnamed module then the {@link |
| * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class |
| * loader for this class is returned. |
| * |
| * @return the module that this class or interface is a member of |
| * |
| * @since 9 |
| */ |
| public Module getModule() { |
| return module; |
| } |
| |
| // set by VM |
| private transient Module module; |
| |
| // Initialized in JVM not by private constructor |
| // This field is filtered from reflection access, i.e. getDeclaredField |
| // will throw NoSuchFieldException |
| private final ClassLoader classLoader; |
| |
| /** |
| * Returns an array of {@code TypeVariable} objects that represent the |
| * type variables declared by the generic declaration represented by this |
| * {@code GenericDeclaration} object, in declaration order. Returns an |
| * array of length 0 if the underlying generic declaration declares no type |
| * variables. |
| * |
| * @return an array of {@code TypeVariable} objects that represent |
| * the type variables declared by this generic declaration |
| * @throws java.lang.reflect.GenericSignatureFormatError if the generic |
| * signature of this generic declaration does not conform to |
| * the format specified in |
| * <cite>The Java™ Virtual Machine Specification</cite> |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| public TypeVariable<Class<T>>[] getTypeParameters() { |
| ClassRepository info = getGenericInfo(); |
| if (info != null) |
| return (TypeVariable<Class<T>>[])info.getTypeParameters(); |
| else |
| return (TypeVariable<Class<T>>[])new TypeVariable<?>[0]; |
| } |
| |
| |
| /** |
| * Returns the {@code Class} representing the direct superclass of the |
| * entity (class, interface, primitive type or void) represented by |
| * this {@code Class}. If this {@code Class} represents either the |
| * {@code Object} class, an interface, a primitive type, or void, then |
| * null is returned. If this object represents an array class then the |
| * {@code Class} object representing the {@code Object} class is |
| * returned. |
| * |
| * @return the direct superclass of the class represented by this object |
| */ |
| @HotSpotIntrinsicCandidate |
| public native Class<? super T> getSuperclass(); |
| |
| |
| /** |
| * Returns the {@code Type} representing the direct superclass of |
| * the entity (class, interface, primitive type or void) represented by |
| * this {@code Class}. |
| * |
| * <p>If the superclass is a parameterized type, the {@code Type} |
| * object returned must accurately reflect the actual type |
| * parameters used in the source code. The parameterized type |
| * representing the superclass is created if it had not been |
| * created before. See the declaration of {@link |
| * java.lang.reflect.ParameterizedType ParameterizedType} for the |
| * semantics of the creation process for parameterized types. If |
| * this {@code Class} represents either the {@code Object} |
| * class, an interface, a primitive type, or void, then null is |
| * returned. If this object represents an array class then the |
| * {@code Class} object representing the {@code Object} class is |
| * returned. |
| * |
| * @throws java.lang.reflect.GenericSignatureFormatError if the generic |
| * class signature does not conform to the format specified in |
| * <cite>The Java™ Virtual Machine Specification</cite> |
| * @throws TypeNotPresentException if the generic superclass |
| * refers to a non-existent type declaration |
| * @throws java.lang.reflect.MalformedParameterizedTypeException if the |
| * generic superclass refers to a parameterized type that cannot be |
| * instantiated for any reason |
| * @return the direct superclass of the class represented by this object |
| * @since 1.5 |
| */ |
| public Type getGenericSuperclass() { |
| ClassRepository info = getGenericInfo(); |
| if (info == null) { |
| return getSuperclass(); |
| } |
| |
| // Historical irregularity: |
| // Generic signature marks interfaces with superclass = Object |
| // but this API returns null for interfaces |
| if (isInterface()) { |
| return null; |
| } |
| |
| return info.getSuperclass(); |
| } |
| |
| /** |
| * Gets the package of this class. |
| * |
| * <p>If this class represents an array type, a primitive type or void, |
| * this method returns {@code null}. |
| * |
| * @return the package of this class. |
| */ |
| public Package getPackage() { |
| if (isPrimitive() || isArray()) { |
| return null; |
| } |
| ClassLoader cl = getClassLoader0(); |
| return cl != null ? cl.definePackage(this) |
| : BootLoader.definePackage(this); |
| } |
| |
| /** |
| * Returns the fully qualified package name. |
| * |
| * <p> If this class is a top level class, then this method returns the fully |
| * qualified name of the package that the class is a member of, or the |
| * empty string if the class is in an unnamed package. |
| * |
| * <p> If this class is a member class, then this method is equivalent to |
| * invoking {@code getPackageName()} on the {@link #getEnclosingClass |
| * enclosing class}. |
| * |
| * <p> If this class is a {@link #isLocalClass local class} or an {@link |
| * #isAnonymousClass() anonymous class}, then this method is equivalent to |
| * invoking {@code getPackageName()} on the {@link #getDeclaringClass |
| * declaring class} of the {@link #getEnclosingMethod enclosing method} or |
| * {@link #getEnclosingConstructor enclosing constructor}. |
| * |
| * <p> This method returns {@code null} if this class represents an array type, |
| * a primitive type or void. |
| * |
| * @return the fully qualified package name |
| * |
| * @since 9 |
| * @jls 6.7 Fully Qualified Names |
| */ |
| public String getPackageName() { |
| String pn = this.packageName; |
| if (pn == null && !isArray() && !isPrimitive()) { |
| String cn = getName(); |
| int dot = cn.lastIndexOf('.'); |
| pn = (dot != -1) ? cn.substring(0, dot).intern() : ""; |
| this.packageName = pn; |
| } |
| return pn; |
| } |
| |
| // cached package name |
| private String packageName; |
| |
| /** |
| * Returns the interfaces directly implemented by the class or interface |
| * represented by this object. |
| * |
| * <p>If this object represents a class, the return value is an array |
| * containing objects representing all interfaces directly implemented by |
| * the class. The order of the interface objects in the array corresponds |
| * to the order of the interface names in the {@code implements} clause of |
| * the declaration of the class represented by this object. For example, |
| * given the declaration: |
| * <blockquote> |
| * {@code class Shimmer implements FloorWax, DessertTopping { ... }} |
| * </blockquote> |
| * suppose the value of {@code s} is an instance of |
| * {@code Shimmer}; the value of the expression: |
| * <blockquote> |
| * {@code s.getClass().getInterfaces()[0]} |
| * </blockquote> |
| * is the {@code Class} object that represents interface |
| * {@code FloorWax}; and the value of: |
| * <blockquote> |
| * {@code s.getClass().getInterfaces()[1]} |
| * </blockquote> |
| * is the {@code Class} object that represents interface |
| * {@code DessertTopping}. |
| * |
| * <p>If this object represents an interface, the array contains objects |
| * representing all interfaces directly extended by the interface. The |
| * order of the interface objects in the array corresponds to the order of |
| * the interface names in the {@code extends} clause of the declaration of |
| * the interface represented by this object. |
| * |
| * <p>If this object represents a class or interface that implements no |
| * interfaces, the method returns an array of length 0. |
| * |
| * <p>If this object represents a primitive type or void, the method |
| * returns an array of length 0. |
| * |
| * <p>If this {@code Class} object represents an array type, the |
| * interfaces {@code Cloneable} and {@code java.io.Serializable} are |
| * returned in that order. |
| * |
| * @return an array of interfaces directly implemented by this class |
| */ |
| public Class<?>[] getInterfaces() { |
| ReflectionData<T> rd = reflectionData(); |
| if (rd == null) { |
| // no cloning required |
| return getInterfaces0(); |
| } else { |
| Class<?>[] interfaces = rd.interfaces; |
| if (interfaces == null) { |
| interfaces = getInterfaces0(); |
| rd.interfaces = interfaces; |
| } |
| // defensively copy before handing over to user code |
| return interfaces.clone(); |
| } |
| } |
| |
| private native Class<?>[] getInterfaces0(); |
| |
| /** |
| * Returns the {@code Type}s representing the interfaces |
| * directly implemented by the class or interface represented by |
| * this object. |
| * |
| * <p>If a superinterface is a parameterized type, the |
| * {@code Type} object returned for it must accurately reflect |
| * the actual type parameters used in the source code. The |
| * parameterized type representing each superinterface is created |
| * if it had not been created before. See the declaration of |
| * {@link java.lang.reflect.ParameterizedType ParameterizedType} |
| * for the semantics of the creation process for parameterized |
| * types. |
| * |
| * <p>If this object represents a class, the return value is an array |
| * containing objects representing all interfaces directly implemented by |
| * the class. The order of the interface objects in the array corresponds |
| * to the order of the interface names in the {@code implements} clause of |
| * the declaration of the class represented by this object. |
| * |
| * <p>If this object represents an interface, the array contains objects |
| * representing all interfaces directly extended by the interface. The |
| * order of the interface objects in the array corresponds to the order of |
| * the interface names in the {@code extends} clause of the declaration of |
| * the interface represented by this object. |
| * |
| * <p>If this object represents a class or interface that implements no |
| * interfaces, the method returns an array of length 0. |
| * |
| * <p>If this object represents a primitive type or void, the method |
| * returns an array of length 0. |
| * |
| * <p>If this {@code Class} object represents an array type, the |
| * interfaces {@code Cloneable} and {@code java.io.Serializable} are |
| * returned in that order. |
| * |
| * @throws java.lang.reflect.GenericSignatureFormatError |
| * if the generic class signature does not conform to the format |
| * specified in |
| * <cite>The Java™ Virtual Machine Specification</cite> |
| * @throws TypeNotPresentException if any of the generic |
| * superinterfaces refers to a non-existent type declaration |
| * @throws java.lang.reflect.MalformedParameterizedTypeException |
| * if any of the generic superinterfaces refer to a parameterized |
| * type that cannot be instantiated for any reason |
| * @return an array of interfaces directly implemented by this class |
| * @since 1.5 |
| */ |
| public Type[] getGenericInterfaces() { |
| ClassRepository info = getGenericInfo(); |
| return (info == null) ? getInterfaces() : info.getSuperInterfaces(); |
| } |
| |
| |
| /** |
| * Returns the {@code Class} representing the component type of an |
| * array. If this class does not represent an array class this method |
| * returns null. |
| * |
| * @return the {@code Class} representing the component type of this |
| * class if this class is an array |
| * @see java.lang.reflect.Array |
| * @since 1.1 |
| */ |
| public Class<?> getComponentType() { |
| // Only return for array types. Storage may be reused for Class for instance types. |
| if (isArray()) { |
| return componentType; |
| } else { |
| return null; |
| } |
| } |
| |
| private final Class<?> componentType; |
| |
| |
| /** |
| * Returns the Java language modifiers for this class or interface, encoded |
| * in an integer. The modifiers consist of the Java Virtual Machine's |
| * constants for {@code public}, {@code protected}, |
| * {@code private}, {@code final}, {@code static}, |
| * {@code abstract} and {@code interface}; they should be decoded |
| * using the methods of class {@code Modifier}. |
| * |
| * <p> If the underlying class is an array class, then its |
| * {@code public}, {@code private} and {@code protected} |
| * modifiers are the same as those of its component type. If this |
| * {@code Class} represents a primitive type or void, its |
| * {@code public} modifier is always {@code true}, and its |
| * {@code protected} and {@code private} modifiers are always |
| * {@code false}. If this object represents an array class, a |
| * primitive type or void, then its {@code final} modifier is always |
| * {@code true} and its interface modifier is always |
| * {@code false}. The values of its other modifiers are not determined |
| * by this specification. |
| * |
| * <p> The modifier encodings are defined in <em>The Java Virtual Machine |
| * Specification</em>, table 4.1. |
| * |
| * @return the {@code int} representing the modifiers for this class |
| * @see java.lang.reflect.Modifier |
| * @since 1.1 |
| */ |
| @HotSpotIntrinsicCandidate |
| public native int getModifiers(); |
| |
| |
| /** |
| * Gets the signers of this class. |
| * |
| * @return the signers of this class, or null if there are no signers. In |
| * particular, this method returns null if this object represents |
| * a primitive type or void. |
| * @since 1.1 |
| */ |
| public native Object[] getSigners(); |
| |
| |
| /** |
| * Set the signers of this class. |
| */ |
| native void setSigners(Object[] signers); |
| |
| |
| /** |
| * If this {@code Class} object represents a local or anonymous |
| * class within a method, returns a {@link |
| * java.lang.reflect.Method Method} object representing the |
| * immediately enclosing method of the underlying class. Returns |
| * {@code null} otherwise. |
| * |
| * In particular, this method returns {@code null} if the underlying |
| * class is a local or anonymous class immediately enclosed by a type |
| * declaration, instance initializer or static initializer. |
| * |
| * @return the immediately enclosing method of the underlying class, if |
| * that class is a local or anonymous class; otherwise {@code null}. |
| * |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of the enclosing class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the methods within the enclosing class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the enclosing class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of the enclosing class |
| * |
| * </ul> |
| * @since 1.5 |
| */ |
| @CallerSensitive |
| public Method getEnclosingMethod() throws SecurityException { |
| EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| |
| if (enclosingInfo == null) |
| return null; |
| else { |
| if (!enclosingInfo.isMethod()) |
| return null; |
| |
| MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(), |
| getFactory()); |
| Class<?> returnType = toClass(typeInfo.getReturnType()); |
| Type [] parameterTypes = typeInfo.getParameterTypes(); |
| Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; |
| |
| // Convert Types to Classes; returned types *should* |
| // be class objects since the methodDescriptor's used |
| // don't have generics information |
| for(int i = 0; i < parameterClasses.length; i++) |
| parameterClasses[i] = toClass(parameterTypes[i]); |
| |
| // Perform access check |
| final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass(); |
| enclosingCandidate.checkMemberAccess(Member.DECLARED, |
| Reflection.getCallerClass(), true); |
| // Client is ok to access declared methods but j.l.Class might not be. |
| Method[] candidates = AccessController.doPrivileged( |
| new PrivilegedAction<>() { |
| @Override |
| public Method[] run() { |
| return enclosingCandidate.getDeclaredMethods(); |
| } |
| }); |
| /* |
| * Loop over all declared methods; match method name, |
| * number of and type of parameters, *and* return |
| * type. Matching return type is also necessary |
| * because of covariant returns, etc. |
| */ |
| for(Method m: candidates) { |
| if (m.getName().equals(enclosingInfo.getName()) ) { |
| Class<?>[] candidateParamClasses = m.getParameterTypes(); |
| if (candidateParamClasses.length == parameterClasses.length) { |
| boolean matches = true; |
| for(int i = 0; i < candidateParamClasses.length; i++) { |
| if (!candidateParamClasses[i].equals(parameterClasses[i])) { |
| matches = false; |
| break; |
| } |
| } |
| |
| if (matches) { // finally, check return type |
| if (m.getReturnType().equals(returnType) ) |
| return m; |
| } |
| } |
| } |
| } |
| |
| throw new InternalError("Enclosing method not found"); |
| } |
| } |
| |
| private native Object[] getEnclosingMethod0(); |
| |
| private EnclosingMethodInfo getEnclosingMethodInfo() { |
| Object[] enclosingInfo = getEnclosingMethod0(); |
| if (enclosingInfo == null) |
| return null; |
| else { |
| return new EnclosingMethodInfo(enclosingInfo); |
| } |
| } |
| |
| private static final class EnclosingMethodInfo { |
| private Class<?> enclosingClass; |
| private String name; |
| private String descriptor; |
| |
| private EnclosingMethodInfo(Object[] enclosingInfo) { |
| if (enclosingInfo.length != 3) |
| throw new InternalError("Malformed enclosing method information"); |
| try { |
| // The array is expected to have three elements: |
| |
| // the immediately enclosing class |
| enclosingClass = (Class<?>) enclosingInfo[0]; |
| assert(enclosingClass != null); |
| |
| // the immediately enclosing method or constructor's |
| // name (can be null). |
| name = (String) enclosingInfo[1]; |
| |
| // the immediately enclosing method or constructor's |
| // descriptor (null iff name is). |
| descriptor = (String) enclosingInfo[2]; |
| assert((name != null && descriptor != null) || name == descriptor); |
| } catch (ClassCastException cce) { |
| throw new InternalError("Invalid type in enclosing method information", cce); |
| } |
| } |
| |
| boolean isPartial() { |
| return enclosingClass == null || name == null || descriptor == null; |
| } |
| |
| boolean isConstructor() { return !isPartial() && "<init>".equals(name); } |
| |
| boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); } |
| |
| Class<?> getEnclosingClass() { return enclosingClass; } |
| |
| String getName() { return name; } |
| |
| String getDescriptor() { return descriptor; } |
| |
| } |
| |
| private static Class<?> toClass(Type o) { |
| if (o instanceof GenericArrayType) |
| return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()), |
| 0) |
| .getClass(); |
| return (Class<?>)o; |
| } |
| |
| /** |
| * If this {@code Class} object represents a local or anonymous |
| * class within a constructor, returns a {@link |
| * java.lang.reflect.Constructor Constructor} object representing |
| * the immediately enclosing constructor of the underlying |
| * class. Returns {@code null} otherwise. In particular, this |
| * method returns {@code null} if the underlying class is a local |
| * or anonymous class immediately enclosed by a type declaration, |
| * instance initializer or static initializer. |
| * |
| * @return the immediately enclosing constructor of the underlying class, if |
| * that class is a local or anonymous class; otherwise {@code null}. |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of the enclosing class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the constructors within the enclosing class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the enclosing class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of the enclosing class |
| * |
| * </ul> |
| * @since 1.5 |
| */ |
| @CallerSensitive |
| public Constructor<?> getEnclosingConstructor() throws SecurityException { |
| EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| |
| if (enclosingInfo == null) |
| return null; |
| else { |
| if (!enclosingInfo.isConstructor()) |
| return null; |
| |
| ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(), |
| getFactory()); |
| Type [] parameterTypes = typeInfo.getParameterTypes(); |
| Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; |
| |
| // Convert Types to Classes; returned types *should* |
| // be class objects since the methodDescriptor's used |
| // don't have generics information |
| for(int i = 0; i < parameterClasses.length; i++) |
| parameterClasses[i] = toClass(parameterTypes[i]); |
| |
| // Perform access check |
| final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass(); |
| enclosingCandidate.checkMemberAccess(Member.DECLARED, |
| Reflection.getCallerClass(), true); |
| // Client is ok to access declared methods but j.l.Class might not be. |
| Constructor<?>[] candidates = AccessController.doPrivileged( |
| new PrivilegedAction<>() { |
| @Override |
| public Constructor<?>[] run() { |
| return enclosingCandidate.getDeclaredConstructors(); |
| } |
| }); |
| /* |
| * Loop over all declared constructors; match number |
| * of and type of parameters. |
| */ |
| for(Constructor<?> c: candidates) { |
| Class<?>[] candidateParamClasses = c.getParameterTypes(); |
| if (candidateParamClasses.length == parameterClasses.length) { |
| boolean matches = true; |
| for(int i = 0; i < candidateParamClasses.length; i++) { |
| if (!candidateParamClasses[i].equals(parameterClasses[i])) { |
| matches = false; |
| break; |
| } |
| } |
| |
| if (matches) |
| return c; |
| } |
| } |
| |
| throw new InternalError("Enclosing constructor not found"); |
| } |
| } |
| |
| |
| /** |
| * If the class or interface represented by this {@code Class} object |
| * is a member of another class, returns the {@code Class} object |
| * representing the class in which it was declared. This method returns |
| * null if this class or interface is not a member of any other class. If |
| * this {@code Class} object represents an array class, a primitive |
| * type, or void,then this method returns null. |
| * |
| * @return the declaring class for this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and the caller's |
| * class loader is not the same as or an ancestor of the class |
| * loader for the declaring class and invocation of {@link |
| * SecurityManager#checkPackageAccess s.checkPackageAccess()} |
| * denies access to the package of the declaring class |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Class<?> getDeclaringClass() throws SecurityException { |
| final Class<?> candidate = getDeclaringClass0(); |
| |
| if (candidate != null) |
| candidate.checkPackageAccess( |
| ClassLoader.getClassLoader(Reflection.getCallerClass()), true); |
| return candidate; |
| } |
| |
| private native Class<?> getDeclaringClass0(); |
| |
| |
| /** |
| * Returns the immediately enclosing class of the underlying |
| * class. If the underlying class is a top level class this |
| * method returns {@code null}. |
| * @return the immediately enclosing class of the underlying class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and the caller's |
| * class loader is not the same as or an ancestor of the class |
| * loader for the enclosing class and invocation of {@link |
| * SecurityManager#checkPackageAccess s.checkPackageAccess()} |
| * denies access to the package of the enclosing class |
| * @since 1.5 |
| */ |
| @CallerSensitive |
| public Class<?> getEnclosingClass() throws SecurityException { |
| // There are five kinds of classes (or interfaces): |
| // a) Top level classes |
| // b) Nested classes (static member classes) |
| // c) Inner classes (non-static member classes) |
| // d) Local classes (named classes declared within a method) |
| // e) Anonymous classes |
| |
| |
| // JVM Spec 4.7.7: A class must have an EnclosingMethod |
| // attribute if and only if it is a local class or an |
| // anonymous class. |
| EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| Class<?> enclosingCandidate; |
| |
| if (enclosingInfo == null) { |
| // This is a top level or a nested class or an inner class (a, b, or c) |
| enclosingCandidate = getDeclaringClass(); |
| } else { |
| Class<?> enclosingClass = enclosingInfo.getEnclosingClass(); |
| // This is a local class or an anonymous class (d or e) |
| if (enclosingClass == this || enclosingClass == null) |
| throw new InternalError("Malformed enclosing method information"); |
| else |
| enclosingCandidate = enclosingClass; |
| } |
| |
| if (enclosingCandidate != null) |
| enclosingCandidate.checkPackageAccess( |
| ClassLoader.getClassLoader(Reflection.getCallerClass()), true); |
| return enclosingCandidate; |
| } |
| |
| /** |
| * Returns the simple name of the underlying class as given in the |
| * source code. Returns an empty string if the underlying class is |
| * anonymous. |
| * |
| * <p>The simple name of an array is the simple name of the |
| * component type with "[]" appended. In particular the simple |
| * name of an array whose component type is anonymous is "[]". |
| * |
| * @return the simple name of the underlying class |
| * @since 1.5 |
| */ |
| public String getSimpleName() { |
| if (isArray()) |
| return getComponentType().getSimpleName()+"[]"; |
| |
| String simpleName = getSimpleBinaryName(); |
| if (simpleName == null) { // top level class |
| simpleName = getName(); |
| return simpleName.substring(simpleName.lastIndexOf('.')+1); // strip the package name |
| } |
| return simpleName; |
| } |
| |
| /** |
| * Return an informative string for the name of this type. |
| * |
| * @return an informative string for the name of this type |
| * @since 1.8 |
| */ |
| public String getTypeName() { |
| if (isArray()) { |
| try { |
| Class<?> cl = this; |
| int dimensions = 0; |
| while (cl.isArray()) { |
| dimensions++; |
| cl = cl.getComponentType(); |
| } |
| StringBuilder sb = new StringBuilder(); |
| sb.append(cl.getName()); |
| for (int i = 0; i < dimensions; i++) { |
| sb.append("[]"); |
| } |
| return sb.toString(); |
| } catch (Throwable e) { /*FALLTHRU*/ } |
| } |
| return getName(); |
| } |
| |
| /** |
| * Character.isDigit answers {@code true} to some non-ascii |
| * digits. This one does not. |
| */ |
| private static boolean isAsciiDigit(char c) { |
| return '0' <= c && c <= '9'; |
| } |
| |
| /** |
| * Returns the canonical name of the underlying class as |
| * defined by the Java Language Specification. Returns null if |
| * the underlying class does not have a canonical name (i.e., if |
| * it is a local or anonymous class or an array whose component |
| * type does not have a canonical name). |
| * @return the canonical name of the underlying class if it exists, and |
| * {@code null} otherwise. |
| * @since 1.5 |
| */ |
| public String getCanonicalName() { |
| if (isArray()) { |
| String canonicalName = getComponentType().getCanonicalName(); |
| if (canonicalName != null) |
| return canonicalName + "[]"; |
| else |
| return null; |
| } |
| if (isLocalOrAnonymousClass()) |
| return null; |
| Class<?> enclosingClass = getEnclosingClass(); |
| if (enclosingClass == null) { // top level class |
| return getName(); |
| } else { |
| String enclosingName = enclosingClass.getCanonicalName(); |
| if (enclosingName == null) |
| return null; |
| return enclosingName + "." + getSimpleName(); |
| } |
| } |
| |
| /** |
| * Returns {@code true} if and only if the underlying class |
| * is an anonymous class. |
| * |
| * @return {@code true} if and only if this class is an anonymous class. |
| * @since 1.5 |
| */ |
| public boolean isAnonymousClass() { |
| return "".equals(getSimpleName()); |
| } |
| |
| /** |
| * Returns {@code true} if and only if the underlying class |
| * is a local class. |
| * |
| * @return {@code true} if and only if this class is a local class. |
| * @since 1.5 |
| */ |
| public boolean isLocalClass() { |
| return isLocalOrAnonymousClass() && !isAnonymousClass(); |
| } |
| |
| /** |
| * Returns {@code true} if and only if the underlying class |
| * is a member class. |
| * |
| * @return {@code true} if and only if this class is a member class. |
| * @since 1.5 |
| */ |
| public boolean isMemberClass() { |
| return getSimpleBinaryName() != null && !isLocalOrAnonymousClass(); |
| } |
| |
| /** |
| * Returns the "simple binary name" of the underlying class, i.e., |
| * the binary name without the leading enclosing class name. |
| * Returns {@code null} if the underlying class is a top level |
| * class. |
| */ |
| private String getSimpleBinaryName() { |
| Class<?> enclosingClass = getEnclosingClass(); |
| if (enclosingClass == null) // top level class |
| return null; |
| String name = getSimpleBinaryName0(); |
| if (name == null) // anonymous class |
| return ""; |
| return name; |
| } |
| |
| private native String getSimpleBinaryName0(); |
| |
| /** |
| * Returns {@code true} if this is a local class or an anonymous |
| * class. Returns {@code false} otherwise. |
| */ |
| private boolean isLocalOrAnonymousClass() { |
| // JVM Spec 4.7.7: A class must have an EnclosingMethod |
| // attribute if and only if it is a local class or an |
| // anonymous class. |
| return getEnclosingMethodInfo() != null; |
| } |
| |
| /** |
| * Returns an array containing {@code Class} objects representing all |
| * the public classes and interfaces that are members of the class |
| * represented by this {@code Class} object. This includes public |
| * class and interface members inherited from superclasses and public class |
| * and interface members declared by the class. This method returns an |
| * array of length 0 if this {@code Class} object has no public member |
| * classes or interfaces. This method also returns an array of length 0 if |
| * this {@code Class} object represents a primitive type, an array |
| * class, or void. |
| * |
| * @return the array of {@code Class} objects representing the public |
| * members of this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| * |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Class<?>[] getClasses() { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false); |
| |
| // Privileged so this implementation can look at DECLARED classes, |
| // something the caller might not have privilege to do. The code here |
| // is allowed to look at DECLARED classes because (1) it does not hand |
| // out anything other than public members and (2) public member access |
| // has already been ok'd by the SecurityManager. |
| |
| return java.security.AccessController.doPrivileged( |
| new java.security.PrivilegedAction<>() { |
| public Class<?>[] run() { |
| List<Class<?>> list = new ArrayList<>(); |
| Class<?> currentClass = Class.this; |
| while (currentClass != null) { |
| for (Class<?> m : currentClass.getDeclaredClasses()) { |
| if (Modifier.isPublic(m.getModifiers())) { |
| list.add(m); |
| } |
| } |
| currentClass = currentClass.getSuperclass(); |
| } |
| return list.toArray(new Class<?>[0]); |
| } |
| }); |
| } |
| |
| |
| /** |
| * Returns an array containing {@code Field} objects reflecting all |
| * the accessible public fields of the class or interface represented by |
| * this {@code Class} object. |
| * |
| * <p> If this {@code Class} object represents a class or interface with |
| * no accessible public fields, then this method returns an array of length |
| * 0. |
| * |
| * <p> If this {@code Class} object represents a class, then this method |
| * returns the public fields of the class and of all its superclasses and |
| * superinterfaces. |
| * |
| * <p> If this {@code Class} object represents an interface, then this |
| * method returns the fields of the interface and of all its |
| * superinterfaces. |
| * |
| * <p> If this {@code Class} object represents an array type, a primitive |
| * type, or void, then this method returns an array of length 0. |
| * |
| * <p> The elements in the returned array are not sorted and are not in any |
| * particular order. |
| * |
| * @return the array of {@code Field} objects representing the |
| * public fields |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| * |
| * @since 1.1 |
| * @jls 8.2 Class Members |
| * @jls 8.3 Field Declarations |
| */ |
| @CallerSensitive |
| public Field[] getFields() throws SecurityException { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); |
| return copyFields(privateGetPublicFields(null)); |
| } |
| |
| |
| /** |
| * Returns an array containing {@code Method} objects reflecting all the |
| * public methods of the class or interface represented by this {@code |
| * Class} object, including those declared by the class or interface and |
| * those inherited from superclasses and superinterfaces. |
| * |
| * <p> If this {@code Class} object represents a type that has multiple |
| * public methods with the same name and parameter types, but different |
| * return types, then the returned array has a {@code Method} object for |
| * each such method. |
| * |
| * <p> If this {@code Class} object represents a type with a class |
| * initialization method {@code <clinit>}, then the returned array does |
| * <em>not</em> have a corresponding {@code Method} object. |
| * |
| * <p> If this {@code Class} object represents an array type, then the |
| * returned array has a {@code Method} object for each of the public |
| * methods inherited by the array type from {@code Object}. It does not |
| * contain a {@code Method} object for {@code clone()}. |
| * |
| * <p> If this {@code Class} object represents an interface then the |
| * returned array does not contain any implicitly declared methods from |
| * {@code Object}. Therefore, if no methods are explicitly declared in |
| * this interface or any of its superinterfaces then the returned array |
| * has length 0. (Note that a {@code Class} object which represents a class |
| * always has public methods, inherited from {@code Object}.) |
| * |
| * <p> If this {@code Class} object represents a primitive type or void, |
| * then the returned array has length 0. |
| * |
| * <p> Static methods declared in superinterfaces of the class or interface |
| * represented by this {@code Class} object are not considered members of |
| * the class or interface. |
| * |
| * <p> The elements in the returned array are not sorted and are not in any |
| * particular order. |
| * |
| * @return the array of {@code Method} objects representing the |
| * public methods of this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| * |
| * @jls 8.2 Class Members |
| * @jls 8.4 Method Declarations |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Method[] getMethods() throws SecurityException { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); |
| return copyMethods(privateGetPublicMethods()); |
| } |
| |
| |
| /** |
| * Returns an array containing {@code Constructor} objects reflecting |
| * all the public constructors of the class represented by this |
| * {@code Class} object. An array of length 0 is returned if the |
| * class has no public constructors, or if the class is an array class, or |
| * if the class reflects a primitive type or void. |
| * |
| * Note that while this method returns an array of {@code |
| * Constructor<T>} objects (that is an array of constructors from |
| * this class), the return type of this method is {@code |
| * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as |
| * might be expected. This less informative return type is |
| * necessary since after being returned from this method, the |
| * array could be modified to hold {@code Constructor} objects for |
| * different classes, which would violate the type guarantees of |
| * {@code Constructor<T>[]}. |
| * |
| * @return the array of {@code Constructor} objects representing the |
| * public constructors of this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| * |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Constructor<?>[] getConstructors() throws SecurityException { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); |
| return copyConstructors(privateGetDeclaredConstructors(true)); |
| } |
| |
| |
| /** |
| * Returns a {@code Field} object that reflects the specified public member |
| * field of the class or interface represented by this {@code Class} |
| * object. The {@code name} parameter is a {@code String} specifying the |
| * simple name of the desired field. |
| * |
| * <p> The field to be reflected is determined by the algorithm that |
| * follows. Let C be the class or interface represented by this object: |
| * |
| * <OL> |
| * <LI> If C declares a public field with the name specified, that is the |
| * field to be reflected.</LI> |
| * <LI> If no field was found in step 1 above, this algorithm is applied |
| * recursively to each direct superinterface of C. The direct |
| * superinterfaces are searched in the order they were declared.</LI> |
| * <LI> If no field was found in steps 1 and 2 above, and C has a |
| * superclass S, then this algorithm is invoked recursively upon S. |
| * If C has no superclass, then a {@code NoSuchFieldException} |
| * is thrown.</LI> |
| * </OL> |
| * |
| * <p> If this {@code Class} object represents an array type, then this |
| * method does not find the {@code length} field of the array type. |
| * |
| * @param name the field name |
| * @return the {@code Field} object of this class specified by |
| * {@code name} |
| * @throws NoSuchFieldException if a field with the specified name is |
| * not found. |
| * @throws NullPointerException if {@code name} is {@code null} |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| * |
| * @since 1.1 |
| * @jls 8.2 Class Members |
| * @jls 8.3 Field Declarations |
| */ |
| @CallerSensitive |
| public Field getField(String name) |
| throws NoSuchFieldException, SecurityException { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); |
| Field field = getField0(name); |
| if (field == null) { |
| throw new NoSuchFieldException(name); |
| } |
| return field; |
| } |
| |
| |
| /** |
| * Returns a {@code Method} object that reflects the specified public |
| * member method of the class or interface represented by this |
| * {@code Class} object. The {@code name} parameter is a |
| * {@code String} specifying the simple name of the desired method. The |
| * {@code parameterTypes} parameter is an array of {@code Class} |
| * objects that identify the method's formal parameter types, in declared |
| * order. If {@code parameterTypes} is {@code null}, it is |
| * treated as if it were an empty array. |
| * |
| * <p> If the {@code name} is "{@code <init>}" or "{@code <clinit>}" a |
| * {@code NoSuchMethodException} is raised. Otherwise, the method to |
| * be reflected is determined by the algorithm that follows. Let C be the |
| * class or interface represented by this object: |
| * <OL> |
| * <LI> C is searched for a <I>matching method</I>, as defined below. If a |
| * matching method is found, it is reflected.</LI> |
| * <LI> If no matching method is found by step 1 then: |
| * <OL TYPE="a"> |
| * <LI> If C is a class other than {@code Object}, then this algorithm is |
| * invoked recursively on the superclass of C.</LI> |
| * <LI> If C is the class {@code Object}, or if C is an interface, then |
| * the superinterfaces of C (if any) are searched for a matching |
| * method. If any such method is found, it is reflected.</LI> |
| * </OL></LI> |
| * </OL> |
| * |
| * <p> To find a matching method in a class or interface C: If C |
| * declares exactly one public method with the specified name and exactly |
| * the same formal parameter types, that is the method reflected. If more |
| * than one such method is found in C, and one of these methods has a |
| * return type that is more specific than any of the others, that method is |
| * reflected; otherwise one of the methods is chosen arbitrarily. |
| * |
| * <p>Note that there may be more than one matching method in a |
| * class because while the Java language forbids a class to |
| * declare multiple methods with the same signature but different |
| * return types, the Java virtual machine does not. This |
| * increased flexibility in the virtual machine can be used to |
| * implement various language features. For example, covariant |
| * returns can be implemented with {@linkplain |
| * java.lang.reflect.Method#isBridge bridge methods}; the bridge |
| * method and the method being overridden would have the same |
| * signature but different return types. |
| * |
| * <p> If this {@code Class} object represents an array type, then this |
| * method does not find the {@code clone()} method. |
| * |
| * <p> Static methods declared in superinterfaces of the class or interface |
| * represented by this {@code Class} object are not considered members of |
| * the class or interface. |
| * |
| * @param name the name of the method |
| * @param parameterTypes the list of parameters |
| * @return the {@code Method} object that matches the specified |
| * {@code name} and {@code parameterTypes} |
| * @throws NoSuchMethodException if a matching method is not found |
| * or if the name is "<init>"or "<clinit>". |
| * @throws NullPointerException if {@code name} is {@code null} |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| * |
| * @jls 8.2 Class Members |
| * @jls 8.4 Method Declarations |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Method getMethod(String name, Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); |
| Method method = getMethod0(name, parameterTypes, true); |
| if (method == null) { |
| throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); |
| } |
| return method; |
| } |
| |
| |
| /** |
| * Returns a {@code Constructor} object that reflects the specified |
| * public constructor of the class represented by this {@code Class} |
| * object. The {@code parameterTypes} parameter is an array of |
| * {@code Class} objects that identify the constructor's formal |
| * parameter types, in declared order. |
| * |
| * If this {@code Class} object represents an inner class |
| * declared in a non-static context, the formal parameter types |
| * include the explicit enclosing instance as the first parameter. |
| * |
| * <p> The constructor to reflect is the public constructor of the class |
| * represented by this {@code Class} object whose formal parameter |
| * types match those specified by {@code parameterTypes}. |
| * |
| * @param parameterTypes the parameter array |
| * @return the {@code Constructor} object of the public constructor that |
| * matches the specified {@code parameterTypes} |
| * @throws NoSuchMethodException if a matching method is not found. |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and |
| * the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class. |
| * |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Constructor<T> getConstructor(Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); |
| return getConstructor0(parameterTypes, Member.PUBLIC); |
| } |
| |
| |
| /** |
| * Returns an array of {@code Class} objects reflecting all the |
| * classes and interfaces declared as members of the class represented by |
| * this {@code Class} object. This includes public, protected, default |
| * (package) access, and private classes and interfaces declared by the |
| * class, but excludes inherited classes and interfaces. This method |
| * returns an array of length 0 if the class declares no classes or |
| * interfaces as members, or if this {@code Class} object represents a |
| * primitive type, an array class, or void. |
| * |
| * @return the array of {@code Class} objects representing all the |
| * declared members of this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of this class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the declared classes within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Class<?>[] getDeclaredClasses() throws SecurityException { |
| checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), false); |
| return getDeclaredClasses0(); |
| } |
| |
| |
| /** |
| * Returns an array of {@code Field} objects reflecting all the fields |
| * declared by the class or interface represented by this |
| * {@code Class} object. This includes public, protected, default |
| * (package) access, and private fields, but excludes inherited fields. |
| * |
| * <p> If this {@code Class} object represents a class or interface with no |
| * declared fields, then this method returns an array of length 0. |
| * |
| * <p> If this {@code Class} object represents an array type, a primitive |
| * type, or void, then this method returns an array of length 0. |
| * |
| * <p> The elements in the returned array are not sorted and are not in any |
| * particular order. |
| * |
| * @return the array of {@code Field} objects representing all the |
| * declared fields of this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of this class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the declared fields within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since 1.1 |
| * @jls 8.2 Class Members |
| * @jls 8.3 Field Declarations |
| */ |
| @CallerSensitive |
| public Field[] getDeclaredFields() throws SecurityException { |
| checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); |
| return copyFields(privateGetDeclaredFields(false)); |
| } |
| |
| |
| /** |
| * |
| * Returns an array containing {@code Method} objects reflecting all the |
| * declared methods of the class or interface represented by this {@code |
| * Class} object, including public, protected, default (package) |
| * access, and private methods, but excluding inherited methods. |
| * |
| * <p> If this {@code Class} object represents a type that has multiple |
| * declared methods with the same name and parameter types, but different |
| * return types, then the returned array has a {@code Method} object for |
| * each such method. |
| * |
| * <p> If this {@code Class} object represents a type that has a class |
| * initialization method {@code <clinit>}, then the returned array does |
| * <em>not</em> have a corresponding {@code Method} object. |
| * |
| * <p> If this {@code Class} object represents a class or interface with no |
| * declared methods, then the returned array has length 0. |
| * |
| * <p> If this {@code Class} object represents an array type, a primitive |
| * type, or void, then the returned array has length 0. |
| * |
| * <p> The elements in the returned array are not sorted and are not in any |
| * particular order. |
| * |
| * @return the array of {@code Method} objects representing all the |
| * declared methods of this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of this class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the declared methods within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @jls 8.2 Class Members |
| * @jls 8.4 Method Declarations |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Method[] getDeclaredMethods() throws SecurityException { |
| checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); |
| return copyMethods(privateGetDeclaredMethods(false)); |
| } |
| |
| |
| /** |
| * Returns an array of {@code Constructor} objects reflecting all the |
| * constructors declared by the class represented by this |
| * {@code Class} object. These are public, protected, default |
| * (package) access, and private constructors. The elements in the array |
| * returned are not sorted and are not in any particular order. If the |
| * class has a default constructor, it is included in the returned array. |
| * This method returns an array of length 0 if this {@code Class} |
| * object represents an interface, a primitive type, an array class, or |
| * void. |
| * |
| * <p> See <em>The Java Language Specification</em>, section 8.2. |
| * |
| * @return the array of {@code Constructor} objects representing all the |
| * declared constructors of this class |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of this class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the declared constructors within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Constructor<?>[] getDeclaredConstructors() throws SecurityException { |
| checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); |
| return copyConstructors(privateGetDeclaredConstructors(false)); |
| } |
| |
| |
| /** |
| * Returns a {@code Field} object that reflects the specified declared |
| * field of the class or interface represented by this {@code Class} |
| * object. The {@code name} parameter is a {@code String} that specifies |
| * the simple name of the desired field. |
| * |
| * <p> If this {@code Class} object represents an array type, then this |
| * method does not find the {@code length} field of the array type. |
| * |
| * @param name the name of the field |
| * @return the {@code Field} object for the specified field in this |
| * class |
| * @throws NoSuchFieldException if a field with the specified name is |
| * not found. |
| * @throws NullPointerException if {@code name} is {@code null} |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of this class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the declared field |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since 1.1 |
| * @jls 8.2 Class Members |
| * @jls 8.3 Field Declarations |
| */ |
| @CallerSensitive |
| public Field getDeclaredField(String name) |
| throws NoSuchFieldException, SecurityException { |
| checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); |
| Field field = searchFields(privateGetDeclaredFields(false), name); |
| if (field == null) { |
| throw new NoSuchFieldException(name); |
| } |
| return field; |
| } |
| |
| |
| /** |
| * Returns a {@code Method} object that reflects the specified |
| * declared method of the class or interface represented by this |
| * {@code Class} object. The {@code name} parameter is a |
| * {@code String} that specifies the simple name of the desired |
| * method, and the {@code parameterTypes} parameter is an array of |
| * {@code Class} objects that identify the method's formal parameter |
| * types, in declared order. If more than one method with the same |
| * parameter types is declared in a class, and one of these methods has a |
| * return type that is more specific than any of the others, that method is |
| * returned; otherwise one of the methods is chosen arbitrarily. If the |
| * name is "<init>"or "<clinit>" a {@code NoSuchMethodException} |
| * is raised. |
| * |
| * <p> If this {@code Class} object represents an array type, then this |
| * method does not find the {@code clone()} method. |
| * |
| * @param name the name of the method |
| * @param parameterTypes the parameter array |
| * @return the {@code Method} object for the method of this class |
| * matching the specified name and parameters |
| * @throws NoSuchMethodException if a matching method is not found. |
| * @throws NullPointerException if {@code name} is {@code null} |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of this class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the declared method |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @jls 8.2 Class Members |
| * @jls 8.4 Method Declarations |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Method getDeclaredMethod(String name, Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); |
| Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); |
| if (method == null) { |
| throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); |
| } |
| return method; |
| } |
| |
| |
| /** |
| * Returns a {@code Constructor} object that reflects the specified |
| * constructor of the class or interface represented by this |
| * {@code Class} object. The {@code parameterTypes} parameter is |
| * an array of {@code Class} objects that identify the constructor's |
| * formal parameter types, in declared order. |
| * |
| * If this {@code Class} object represents an inner class |
| * declared in a non-static context, the formal parameter types |
| * include the explicit enclosing instance as the first parameter. |
| * |
| * @param parameterTypes the parameter array |
| * @return The {@code Constructor} object for the constructor with the |
| * specified parameter list |
| * @throws NoSuchMethodException if a matching method is not found. |
| * @throws SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> the caller's class loader is not the same as the |
| * class loader of this class and invocation of |
| * {@link SecurityManager#checkPermission |
| * s.checkPermission} method with |
| * {@code RuntimePermission("accessDeclaredMembers")} |
| * denies access to the declared constructor |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); |
| return getConstructor0(parameterTypes, Member.DECLARED); |
| } |
| |
| /** |
| * Finds a resource with a given name. If this class is in a named {@link |
| * Module Module}, and the caller of this method is in the same module, |
| * then this method will attempt to find the resource in that module. |
| * Otherwise, the rules for searching resources |
| * associated with a given class are implemented by the defining |
| * {@linkplain ClassLoader class loader} of the class. This method |
| * delegates to this object's class loader. If this object was loaded by |
| * the bootstrap class loader, the method delegates to {@link |
| * ClassLoader#getSystemResourceAsStream}. |
| * |
| * <p> Before finding a resource in the caller's module or delegation to a |
| * class loader, an absolute resource name is constructed from the given |
| * resource name using this algorithm: |
| * |
| * <ul> |
| * |
| * <li> If the {@code name} begins with a {@code '/'} |
| * (<tt>'\u002f'</tt>), then the absolute name of the resource is the |
| * portion of the {@code name} following the {@code '/'}. |
| * |
| * <li> Otherwise, the absolute name is of the following form: |
| * |
| * <blockquote> |
| * {@code modified_package_name/name} |
| * </blockquote> |
| * |
| * <p> Where the {@code modified_package_name} is the package name of this |
| * object with {@code '/'} substituted for {@code '.'} |
| * (<tt>'\u002e'</tt>). |
| * |
| * </ul> |
| * |
| * @param name name of the desired resource |
| * @return A {@link java.io.InputStream} object or {@code null} if |
| * no resource with this name is found |
| * @throws NullPointerException If {@code name} is {@code null} |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public InputStream getResourceAsStream(String name) { |
| name = resolveName(name); |
| |
| // if this Class and the caller are in the same named module |
| // then attempt to get an input stream to the resource in the |
| // module |
| Module module = getModule(); |
| if (module.isNamed()) { |
| Class<?> caller = Reflection.getCallerClass(); |
| if (caller != null && caller.getModule() == module) { |
| ClassLoader cl = getClassLoader0(); |
| String mn = module.getName(); |
| try { |
| |
| // special-case built-in class loaders to avoid the |
| // need for a URL connection |
| if (cl == null) { |
| return BootLoader.findResourceAsStream(mn, name); |
| } else if (cl instanceof BuiltinClassLoader) { |
| return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name); |
| } else { |
| URL url = cl.findResource(mn, name); |
| return (url != null) ? url.openStream() : null; |
| } |
| |
| } catch (IOException | SecurityException e) { |
| return null; |
| } |
| } |
| } |
| |
| // this Class and caller not in the same named module |
| ClassLoader cl = getClassLoader0(); |
| if (cl == null) { |
| return ClassLoader.getSystemResourceAsStream(name); |
| } else { |
| return cl.getResourceAsStream(name); |
| } |
| } |
| |
| /** |
| * Finds a resource with a given name. If this class is in a named {@link |
| * Module Module}, and the caller of this method is in the same module, |
| * then this method will attempt to find the resource in that module. |
| * Otherwise, the rules for searching resources |
| * associated with a given class are implemented by the defining |
| * {@linkplain ClassLoader class loader} of the class. This method |
| * delegates to this object's class loader. If this object was loaded by |
| * the bootstrap class loader, the method delegates to {@link |
| * ClassLoader#getSystemResource}. |
| * |
| * <p> Before delegation, an absolute resource name is constructed from the |
| * given resource name using this algorithm: |
| * |
| * <ul> |
| * |
| * <li> If the {@code name} begins with a {@code '/'} |
| * (<tt>'\u002f'</tt>), then the absolute name of the resource is the |
| * portion of the {@code name} following the {@code '/'}. |
| * |
| * <li> Otherwise, the absolute name is of the following form: |
| * |
| * <blockquote> |
| * {@code modified_package_name/name} |
| * </blockquote> |
| * |
| * <p> Where the {@code modified_package_name} is the package name of this |
| * object with {@code '/'} substituted for {@code '.'} |
| * (<tt>'\u002e'</tt>). |
| * |
| * </ul> |
| * |
| * @param name name of the desired resource |
| * @return A {@link java.net.URL} object; {@code null} if no |
| * resource with this name is found or the resource cannot |
| * be located by a URL. |
| * @since 1.1 |
| */ |
| @CallerSensitive |
| public URL getResource(String name) { |
| name = resolveName(name); |
| |
| // if this Class and the caller are in the same named module |
| // then attempt to get URL to the resource in the module |
| Module module = getModule(); |
| if (module.isNamed()) { |
| Class<?> caller = Reflection.getCallerClass(); |
| if (caller != null && caller.getModule() == module) { |
| String mn = getModule().getName(); |
| ClassLoader cl = getClassLoader0(); |
| try { |
| if (cl == null) { |
| return BootLoader.findResource(mn, name); |
| } else { |
| return cl.findResource(mn, name); |
| } |
| } catch (IOException ioe) { |
| return null; |
| } |
| } |
| } |
| |
| ClassLoader cl = getClassLoader0(); |
| if (cl == null) { |
| return ClassLoader.getSystemResource(name); |
| } else { |
| return cl.getResource(name); |
| } |
| } |
| |
| /** protection domain returned when the internal domain is null */ |
| private static java.security.ProtectionDomain allPermDomain; |
| |
| |
| /** |
| * Returns the {@code ProtectionDomain} of this class. If there is a |
| * security manager installed, this method first calls the security |
| * manager's {@code checkPermission} method with a |
| * {@code RuntimePermission("getProtectionDomain")} permission to |
| * ensure it's ok to get the |
| * {@code ProtectionDomain}. |
| * |
| * @return the ProtectionDomain of this class |
| * |
| * @throws SecurityException |
| * if a security manager exists and its |
| * {@code checkPermission} method doesn't allow |
| * getting the ProtectionDomain. |
| * |
| * @see java.security.ProtectionDomain |
| * @see SecurityManager#checkPermission |
| * @see java.lang.RuntimePermission |
| * @since 1.2 |
| */ |
| public java.security.ProtectionDomain getProtectionDomain() { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(SecurityConstants.GET_PD_PERMISSION); |
| } |
| java.security.ProtectionDomain pd = getProtectionDomain0(); |
| if (pd == null) { |
| if (allPermDomain == null) { |
| java.security.Permissions perms = |
| new java.security.Permissions(); |
| perms.add(SecurityConstants.ALL_PERMISSION); |
| allPermDomain = |
| new java.security.ProtectionDomain(null, perms); |
| } |
| pd = allPermDomain; |
| } |
| return pd; |
| } |
| |
| |
| /** |
| * Returns the ProtectionDomain of this class. |
| */ |
| private native java.security.ProtectionDomain getProtectionDomain0(); |
| |
| /* |
| * Return the Virtual Machine's Class object for the named |
| * primitive type. |
| */ |
| static native Class<?> getPrimitiveClass(String name); |
| |
| /* |
| * Check if client is allowed to access members. If access is denied, |
| * throw a SecurityException. |
| * |
| * This method also enforces package access. |
| * |
| * <p> Default policy: allow all clients access with normal Java access |
| * control. |
| */ |
| private void checkMemberAccess(int which, Class<?> caller, boolean checkProxyInterfaces) { |
| final SecurityManager s = System.getSecurityManager(); |
| if (s != null) { |
| /* Default policy allows access to all {@link Member#PUBLIC} members, |
| * as well as access to classes that have the same class loader as the caller. |
| * In all other cases, it requires RuntimePermission("accessDeclaredMembers") |
| * permission. |
| */ |
| final ClassLoader ccl = ClassLoader.getClassLoader(caller); |
| final ClassLoader cl = getClassLoader0(); |
| if (which != Member.PUBLIC) { |
| if (ccl != cl) { |
| s.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION); |
| } |
| } |
| this.checkPackageAccess(ccl, checkProxyInterfaces); |
| } |
| } |
| |
| /* |
| * Checks if a client loaded in ClassLoader ccl is allowed to access this |
| * class under the current package access policy. If access is denied, |
| * throw a SecurityException. |
| */ |
| private void checkPackageAccess(final ClassLoader ccl, boolean checkProxyInterfaces) { |
| final SecurityManager s = System.getSecurityManager(); |
| if (s != null) { |
| final ClassLoader cl = getClassLoader0(); |
| |
| if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) { |
| String name = this.getName(); |
| int i = name.lastIndexOf('.'); |
| if (i != -1) { |
| // skip the package access check on a proxy class in default proxy package |
| String pkg = name.substring(0, i); |
| if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) { |
| s.checkPackageAccess(pkg); |
| } |
| } |
| } |
| // check package access on the proxy interfaces |
| if (checkProxyInterfaces && Proxy.isProxyClass(this)) { |
| ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces()); |
| } |
| } |
| } |
| |
| /** |
| * Add a package name prefix if the name is not absolute Remove leading "/" |
| * if name is absolute |
| */ |
| private String resolveName(String name) { |
| if (name == null) { |
| return name; |
| } |
| if (!name.startsWith("/")) { |
| Class<?> c = this; |
| while (c.isArray()) { |
| c = c.getComponentType(); |
| } |
| String baseName = c.getName(); |
| int index = baseName.lastIndexOf('.'); |
| if (index != -1) { |
| name = baseName.substring(0, index).replace('.', '/') |
| +"/"+name; |
| } |
| } else { |
| name = name.substring(1); |
| } |
| return name; |
| } |
| |
| /** |
| * Atomic operations support. |
| */ |
| private static class Atomic { |
| // initialize Unsafe machinery here, since we need to call Class.class instance method |
| // and have to avoid calling it in the static initializer of the Class class... |
| private static final Unsafe unsafe = Unsafe.getUnsafe(); |
| // offset of Class.reflectionData instance field |
| private static final long reflectionDataOffset; |
| // offset of Class.annotationType instance field |
| private static final long annotationTypeOffset; |
| // offset of Class.annotationData instance field |
| private static final long annotationDataOffset; |
| |
| static { |
| Field[] fields = Class.class.getDeclaredFields0(false); // bypass caches |
| reflectionDataOffset = objectFieldOffset(fields, "reflectionData"); |
| annotationTypeOffset = objectFieldOffset(fields, "annotationType"); |
| annotationDataOffset = objectFieldOffset(fields, "annotationData"); |
| } |
| |
| private static long objectFieldOffset(Field[] fields, String fieldName) { |
| Field field = searchFields(fields, fieldName); |
| if (field == null) { |
| throw new Error("No " + fieldName + " field found in java.lang.Class"); |
| } |
| return unsafe.objectFieldOffset(field); |
| } |
| |
| static <T> boolean casReflectionData(Class<?> clazz, |
| SoftReference<ReflectionData<T>> oldData, |
| SoftReference<ReflectionData<T>> newData) { |
| return unsafe.compareAndSwapObject(clazz, reflectionDataOffset, oldData, newData); |
| } |
| |
| static <T> boolean casAnnotationType(Class<?> clazz, |
| AnnotationType oldType, |
| AnnotationType newType) { |
| return unsafe.compareAndSwapObject(clazz, annotationTypeOffset, oldType, newType); |
| } |
| |
| static <T> boolean casAnnotationData(Class<?> clazz, |
| AnnotationData oldData, |
| AnnotationData newData) { |
| return unsafe.compareAndSwapObject(clazz, annotationDataOffset, oldData, newData); |
| } |
| } |
| |
| /** |
| * Reflection support. |
| */ |
| |
| // Caches for certain reflective results |
| private static boolean useCaches = true; |
| |
| // reflection data that might get invalidated when JVM TI RedefineClasses() is called |
| private static class ReflectionData<T> { |
| volatile Field[] declaredFields; |
| volatile Field[] publicFields; |
| volatile Method[] declaredMethods; |
| volatile Method[] publicMethods; |
| volatile Constructor<T>[] declaredConstructors; |
| volatile Constructor<T>[] publicConstructors; |
| // Intermediate results for getFields and getMethods |
| volatile Field[] declaredPublicFields; |
| volatile Method[] declaredPublicMethods; |
| volatile Class<?>[] interfaces; |
| |
| // Value of classRedefinedCount when we created this ReflectionData instance |
| final int redefinedCount; |
| |
| ReflectionData(int redefinedCount) { |
| this.redefinedCount = redefinedCount; |
| } |
| } |
| |
| private transient volatile SoftReference<ReflectionData<T>> reflectionData; |
| |
| // Incremented by the VM on each call to JVM TI RedefineClasses() |
| // that redefines this class or a superclass. |
| private transient volatile int classRedefinedCount; |
| |
| // Lazily create and cache ReflectionData |
| private ReflectionData<T> reflectionData() { |
| SoftReference<ReflectionData<T>> reflectionData = this.reflectionData; |
| int classRedefinedCount = this.classRedefinedCount; |
| ReflectionData<T> rd; |
| if (useCaches && |
| reflectionData != null && |
| (rd = reflectionData.get()) != null && |
| rd.redefinedCount == classRedefinedCount) { |
| return rd; |
| } |
| // else no SoftReference or cleared SoftReference or stale ReflectionData |
| // -> create and replace new instance |
| return newReflectionData(reflectionData, classRedefinedCount); |
| } |
| |
| private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData, |
| int classRedefinedCount) { |
| if (!useCaches) return null; |
| |
| while (true) { |
| ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount); |
| // try to CAS it... |
| if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) { |
| return rd; |
| } |
| // else retry |
| oldReflectionData = this.reflectionData; |
| classRedefinedCount = this.classRedefinedCount; |
| if (oldReflectionData != null && |
| (rd = oldReflectionData.get()) != null && |
| rd.redefinedCount == classRedefinedCount) { |
| return rd; |
| } |
| } |
| } |
| |
| // Generic signature handling |
| private native String getGenericSignature0(); |
| |
| // Generic info repository; lazily initialized |
| private transient volatile ClassRepository genericInfo; |
| |
| // accessor for factory |
| private GenericsFactory getFactory() { |
| // create scope and factory |
| return CoreReflectionFactory.make(this, ClassScope.make(this)); |
| } |
| |
| // accessor for generic info repository; |
| // generic info is lazily initialized |
| private ClassRepository getGenericInfo() { |
| ClassRepository genericInfo = this.genericInfo; |
| if (genericInfo == null) { |
| String signature = getGenericSignature0(); |
| if (signature == null) { |
| genericInfo = ClassRepository.NONE; |
| } else { |
| genericInfo = ClassRepository.make(signature, getFactory()); |
| } |
| this.genericInfo = genericInfo; |
| } |
| return (genericInfo != ClassRepository.NONE) ? genericInfo : null; |
| } |
| |
| // Annotations handling |
| native byte[] getRawAnnotations(); |
| // Since 1.8 |
| native byte[] getRawTypeAnnotations(); |
| static byte[] getExecutableTypeAnnotationBytes(Executable ex) { |
| return getReflectionFactory().getExecutableTypeAnnotationBytes(ex); |
| } |
| |
| native ConstantPool getConstantPool(); |
| |
| // |
| // |
| // java.lang.reflect.Field handling |
| // |
| // |
| |
| // Returns an array of "root" fields. These Field objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyField. |
| private Field[] privateGetDeclaredFields(boolean publicOnly) { |
| checkInitted(); |
| Field[] res; |
| ReflectionData<T> rd = reflectionData(); |
| if (rd != null) { |
| res = publicOnly ? rd.declaredPublicFields : rd.declaredFields; |
| if (res != null) return res; |
| } |
| // No cached value available; request value from VM |
| res = Reflection.filterFields(this, getDeclaredFields0(publicOnly)); |
| if (rd != null) { |
| if (publicOnly) { |
| rd.declaredPublicFields = res; |
| } else { |
| rd.declaredFields = res; |
| } |
| } |
| return res; |
| } |
| |
| // Returns an array of "root" fields. These Field objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyField. |
| private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) { |
| checkInitted(); |
| Field[] res; |
| ReflectionData<T> rd = reflectionData(); |
| if (rd != null) { |
| res = rd.publicFields; |
| if (res != null) return res; |
| } |
| |
| // No cached value available; compute value recursively. |
| // Traverse in correct order for getField(). |
| List<Field> fields = new ArrayList<>(); |
| if (traversedInterfaces == null) { |
| traversedInterfaces = new HashSet<>(); |
| } |
| |
| // Local fields |
| Field[] tmp = privateGetDeclaredFields(true); |
| addAll(fields, tmp); |
| |
| // Direct superinterfaces, recursively |
| for (Class<?> c : getInterfaces()) { |
| if (!traversedInterfaces.contains(c)) { |
| traversedInterfaces.add(c); |
| addAll(fields, c.privateGetPublicFields(traversedInterfaces)); |
| } |
| } |
| |
| // Direct superclass, recursively |
| if (!isInterface()) { |
| Class<?> c = getSuperclass(); |
| if (c != null) { |
| addAll(fields, c.privateGetPublicFields(traversedInterfaces)); |
| } |
| } |
| |
| res = new Field[fields.size()]; |
| fields.toArray(res); |
| if (rd != null) { |
| rd.publicFields = res; |
| } |
| return res; |
| } |
| |
| private static void addAll(Collection<Field> c, Field[] o) { |
| for (Field f : o) { |
| c.add(f); |
| } |
| } |
| |
| |
| // |
| // |
| // java.lang.reflect.Constructor handling |
| // |
| // |
| |
| // Returns an array of "root" constructors. These Constructor |
| // objects must NOT be propagated to the outside world, but must |
| // instead be copied via ReflectionFactory.copyConstructor. |
| private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) { |
| checkInitted(); |
| Constructor<T>[] res; |
| ReflectionData<T> rd = reflectionData(); |
| if (rd != null) { |
| res = publicOnly ? rd.publicConstructors : rd.declaredConstructors; |
| if (res != null) return res; |
| } |
| // No cached value available; request value from VM |
| if (isInterface()) { |
| @SuppressWarnings("unchecked") |
| Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0]; |
| res = temporaryRes; |
| } else { |
| res = getDeclaredConstructors0(publicOnly); |
| } |
| if (rd != null) { |
| if (publicOnly) { |
| rd.publicConstructors = res; |
| } else { |
| rd.declaredConstructors = res; |
| } |
| } |
| return res; |
| } |
| |
| // |
| // |
| // java.lang.reflect.Method handling |
| // |
| // |
| |
| // Returns an array of "root" methods. These Method objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyMethod. |
| private Method[] privateGetDeclaredMethods(boolean publicOnly) { |
| checkInitted(); |
| Method[] res; |
| ReflectionData<T> rd = reflectionData(); |
| if (rd != null) { |
| res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods; |
| if (res != null) return res; |
| } |
| // No cached value available; request value from VM |
| res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly)); |
| if (rd != null) { |
| if (publicOnly) { |
| rd.declaredPublicMethods = res; |
| } else { |
| rd.declaredMethods = res; |
| } |
| } |
| return res; |
| } |
| |
| static class MethodArray { |
| // Don't add or remove methods except by add() or remove() calls. |
| private Method[] methods; |
| private int length; |
| private int defaults; |
| |
| MethodArray() { |
| this(20); |
| } |
| |
| MethodArray(int initialSize) { |
| if (initialSize < 2) |
| throw new IllegalArgumentException("Size should be 2 or more"); |
| |
| methods = new Method[initialSize]; |
| length = 0; |
| defaults = 0; |
| } |
| |
| boolean hasDefaults() { |
| return defaults != 0; |
| } |
| |
| void add(Method m) { |
| if (length == methods.length) { |
| methods = Arrays.copyOf(methods, 2 * methods.length); |
| } |
| methods[length++] = m; |
| |
| if (m != null && m.isDefault()) |
| defaults++; |
| } |
| |
| void addAll(Method[] ma) { |
| for (Method m : ma) { |
| add(m); |
| } |
| } |
| |
| void addAll(MethodArray ma) { |
| for (int i = 0; i < ma.length(); i++) { |
| add(ma.get(i)); |
| } |
| } |
| |
| void addIfNotPresent(Method newMethod) { |
| for (int i = 0; i < length; i++) { |
| Method m = methods[i]; |
| if (m == newMethod || (m != null && m.equals(newMethod))) { |
| return; |
| } |
| } |
| add(newMethod); |
| } |
| |
| void addAllIfNotPresent(MethodArray newMethods) { |
| for (int i = 0; i < newMethods.length(); i++) { |
| Method m = newMethods.get(i); |
| if (m != null) { |
| addIfNotPresent(m); |
| } |
| } |
| } |
| |
| /* Add Methods declared in an interface to this MethodArray. |
| * Static methods declared in interfaces are not inherited. |
| */ |
| void addInterfaceMethods(Method[] methods) { |
| for (Method candidate : methods) { |
| if (!Modifier.isStatic(candidate.getModifiers())) { |
| add(candidate); |
| } |
| } |
| } |
| |
| int length() { |
| return length; |
| } |
| |
| Method get(int i) { |
| return methods[i]; |
| } |
| |
| Method getFirst() { |
| for (Method m : methods) |
| if (m != null) |
| return m; |
| return null; |
| } |
| |
| void removeByNameAndDescriptor(Method toRemove) { |
| for (int i = 0; i < length; i++) { |
| Method m = methods[i]; |
| if (m != null && matchesNameAndDescriptor(m, toRemove)) { |
| remove(i); |
| } |
| } |
| } |
| |
| private void remove(int i) { |
| if (methods[i] != null && methods[i].isDefault()) |
| defaults--; |
| methods[i] = null; |
| } |
| |
| private boolean matchesNameAndDescriptor(Method m1, Method m2) { |
| return m1.getReturnType() == m2.getReturnType() && |
| m1.getName() == m2.getName() && // name is guaranteed to be interned |
| arrayContentsEq(m1.getParameterTypes(), |
| m2.getParameterTypes()); |
| } |
| |
| void compactAndTrim() { |
| int newPos = 0; |
| // Get rid of null slots |
| for (int pos = 0; pos < length; pos++) { |
| Method m = methods[pos]; |
| if (m != null) { |
| if (pos != newPos) { |
| methods[newPos] = m; |
| } |
| newPos++; |
| } |
| } |
| if (newPos != methods.length) { |
| methods = Arrays.copyOf(methods, newPos); |
| } |
| } |
| |
| /* Removes all Methods from this MethodArray that have a more specific |
| * default Method in this MethodArray. |
| * |
| * Users of MethodArray are responsible for pruning Methods that have |
| * a more specific <em>concrete</em> Method. |
| */ |
| void removeLessSpecifics() { |
| if (!hasDefaults()) |
| return; |
| |
| for (int i = 0; i < length; i++) { |
| Method m = get(i); |
| if (m == null || !m.isDefault()) |
| continue; |
| |
| for (int j = 0; j < length; j++) { |
| if (i == j) |
| continue; |
| |
| Method candidate = get(j); |
| if (candidate == null) |
| continue; |
| |
| if (!matchesNameAndDescriptor(m, candidate)) |
| continue; |
| |
| if (hasMoreSpecificClass(m, candidate)) |
| remove(j); |
| } |
| } |
| } |
| |
| Method[] getArray() { |
| return methods; |
| } |
| |
| // Returns true if m1 is more specific than m2 |
| static boolean hasMoreSpecificClass(Method m1, Method m2) { |
| Class<?> m1Class = m1.getDeclaringClass(); |
| Class<?> m2Class = m2.getDeclaringClass(); |
| return m1Class != m2Class && m2Class.isAssignableFrom(m1Class); |
| } |
| } |
| |
| |
| // Returns an array of "root" methods. These Method objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyMethod. |
| private Method[] privateGetPublicMethods() { |
| checkInitted(); |
| Method[] res; |
| ReflectionData<T> rd = reflectionData(); |
| if (rd != null) { |
| res = rd.publicMethods; |
| if (res != null) return res; |
| } |
| |
| // No cached value available; compute value recursively. |
| // Start by fetching public declared methods |
| MethodArray methods = new MethodArray(); |
| { |
| Method[] tmp = privateGetDeclaredMethods(true); |
| methods.addAll(tmp); |
| } |
| // Now recur over superclass and direct superinterfaces. |
| // Go over superinterfaces first so we can more easily filter |
| // out concrete implementations inherited from superclasses at |
| // the end. |
| MethodArray inheritedMethods = new MethodArray(); |
| for (Class<?> i : getInterfaces()) { |
| inheritedMethods.addInterfaceMethods(i.privateGetPublicMethods()); |
| } |
| if (!isInterface()) { |
| Class<?> c = getSuperclass(); |
| if (c != null) { |
| MethodArray supers = new MethodArray(); |
| supers.addAll(c.privateGetPublicMethods()); |
| // Filter out concrete implementations of any |
| // interface methods |
| for (int i = 0; i < supers.length(); i++) { |
| Method m = supers.get(i); |
| if (m != null && |
| !Modifier.isAbstract(m.getModifiers()) && |
| !m.isDefault()) { |
| inheritedMethods.removeByNameAndDescriptor(m); |
| } |
| } |
| // Insert superclass's inherited methods before |
| // superinterfaces' to satisfy getMethod's search |
| // order |
| supers.addAll(inheritedMethods); |
| inheritedMethods = supers; |
| } |
| } |
| // Filter out all local methods from inherited ones |
| for (int i = 0; i < methods.length(); i++) { |
| Method m = methods.get(i); |
| inheritedMethods.removeByNameAndDescriptor(m); |
| } |
| methods.addAllIfNotPresent(inheritedMethods); |
| methods.removeLessSpecifics(); |
| methods.compactAndTrim(); |
| res = methods.getArray(); |
| if (rd != null) { |
| rd.publicMethods = res; |
| } |
| return res; |
| } |
| |
| |
| // |
| // Helpers for fetchers of one field, method, or constructor |
| // |
| |
| private static Field searchFields(Field[] fields, String name) { |
| String internedName = name.intern(); |
| for (Field field : fields) { |
| if (field.getName() == internedName) { |
| return getReflectionFactory().copyField(field); |
| } |
| } |
| return null; |
| } |
| |
| private Field getField0(String name) throws NoSuchFieldException { |
| // Note: the intent is that the search algorithm this routine |
| // uses be equivalent to the ordering imposed by |
| // privateGetPublicFields(). It fetches only the declared |
| // public fields for each class, however, to reduce the number |
| // of Field objects which have to be created for the common |
| // case where the field being requested is declared in the |
| // class which is being queried. |
| Field res; |
| // Search declared public fields |
| if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) { |
| return res; |
| } |
| // Direct superinterfaces, recursively |
| Class<?>[] interfaces = getInterfaces(); |
| for (Class<?> c : interfaces) { |
| if ((res = c.getField0(name)) != null) { |
| return res; |
| } |
| } |
| // Direct superclass, recursively |
| if (!isInterface()) { |
| Class<?> c = getSuperclass(); |
| if (c != null) { |
| if ((res = c.getField0(name)) != null) { |
| return res; |
| } |
| } |
| } |
| return null; |
| } |
| |
| private static Method searchMethods(Method[] methods, |
| String name, |
| Class<?>[] parameterTypes) |
| { |
| Method res = null; |
| String internedName = name.intern(); |
| for (Method m : methods) { |
| if (m.getName() == internedName |
| && arrayContentsEq(parameterTypes, m.getParameterTypes()) |
| && (res == null |
| || res.getReturnType().isAssignableFrom(m.getReturnType()))) |
| res = m; |
| } |
| |
| return (res == null ? res : getReflectionFactory().copyMethod(res)); |
| } |
| |
| private Method getMethod0(String name, Class<?>[] parameterTypes, boolean includeStaticMethods) { |
| MethodArray interfaceCandidates = new MethodArray(2); |
| Method res = privateGetMethodRecursive(name, parameterTypes, includeStaticMethods, interfaceCandidates); |
| if (res != null) |
| return res; |
| |
| // Not found on class or superclass directly |
| interfaceCandidates.removeLessSpecifics(); |
| return interfaceCandidates.getFirst(); // may be null |
| } |
| |
| private Method privateGetMethodRecursive(String name, |
| Class<?>[] parameterTypes, |
| boolean includeStaticMethods, |
| MethodArray allInterfaceCandidates) { |
| // Note: the intent is that the search algorithm this routine |
| // uses be equivalent to the ordering imposed by |
| // privateGetPublicMethods(). It fetches only the declared |
| // public methods for each class, however, to reduce the |
| // number of Method objects which have to be created for the |
| // common case where the method being requested is declared in |
| // the class which is being queried. |
| // |
| // Due to default methods, unless a method is found on a superclass, |
| // methods declared in any superinterface needs to be considered. |
| // Collect all candidates declared in superinterfaces in {@code |
| // allInterfaceCandidates} and select the most specific if no match on |
| // a superclass is found. |
| |
| // Must _not_ return root methods |
| Method res; |
| // Search declared public methods |
| if ((res = searchMethods(privateGetDeclaredMethods(true), |
| name, |
| parameterTypes)) != null) { |
| if (includeStaticMethods || !Modifier.isStatic(res.getModifiers())) |
| return res; |
| } |
| // Search superclass's methods |
| if (!isInterface()) { |
| Class<? super T> c = getSuperclass(); |
| if (c != null) { |
| if ((res = c.getMethod0(name, parameterTypes, true)) != null) { |
| return res; |
| } |
| } |
| } |
| // Search superinterfaces' methods |
| Class<?>[] interfaces = getInterfaces(); |
| for (Class<?> c : interfaces) |
| if ((res = c.getMethod0(name, parameterTypes, false)) != null) |
| allInterfaceCandidates.add(res); |
| // Not found |
| return null; |
| } |
| |
| private Constructor<T> getConstructor0(Class<?>[] parameterTypes, |
| int which) throws NoSuchMethodException |
| { |
| Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC)); |
| for (Constructor<T> constructor : constructors) { |
| if (arrayContentsEq(parameterTypes, |
| constructor.getParameterTypes())) { |
| return getReflectionFactory().copyConstructor(constructor); |
| } |
| } |
| throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes)); |
| } |
| |
| // |
| // Other helpers and base implementation |
| // |
| |
| private static boolean arrayContentsEq(Object[] a1, Object[] a2) { |
| if (a1 == null) { |
| return a2 == null || a2.length == 0; |
| } |
| |
| if (a2 == null) { |
| return a1.length == 0; |
| } |
| |
| if (a1.length != a2.length) { |
| return false; |
| } |
| |
| for (int i = 0; i < a1.length; i++) { |
| if (a1[i] != a2[i]) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| private static Field[] copyFields(Field[] arg) { |
| Field[] out = new Field[arg.length]; |
| ReflectionFactory fact = getReflectionFactory(); |
| for (int i = 0; i < arg.length; i++) { |
| out[i] = fact.copyField(arg[i]); |
| } |
| return out; |
| } |
| |
| private static Method[] copyMethods(Method[] arg) { |
| Method[] out = new Method[arg.length]; |
| ReflectionFactory fact = getReflectionFactory(); |
| for (int i = 0; i < arg.length; i++) { |
| out[i] = fact.copyMethod(arg[i]); |
| } |
| return out; |
| } |
| |
| private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) { |
| Constructor<U>[] out = arg.clone(); |
| ReflectionFactory fact = getReflectionFactory(); |
| for (int i = 0; i < out.length; i++) { |
| out[i] = fact.copyConstructor(out[i]); |
| } |
| return out; |
| } |
| |
| private native Field[] getDeclaredFields0(boolean publicOnly); |
| private native Method[] getDeclaredMethods0(boolean publicOnly); |
| private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly); |
| private native Class<?>[] getDeclaredClasses0(); |
| |
| private static String argumentTypesToString(Class<?>[] argTypes) { |
| StringJoiner sj = new StringJoiner(", ", "(", ")"); |
| if (argTypes != null) { |
| for (int i = 0; i < argTypes.length; i++) { |
| Class<?> c = argTypes[i]; |
| sj.add((c == null) ? "null" : c.getName()); |
| } |
| } |
| return sj.toString(); |
| } |
| |
| /** use serialVersionUID from JDK 1.1 for interoperability */ |
| private static final long serialVersionUID = 3206093459760846163L; |
| |
| |
| /** |
| * Class Class is special cased within the Serialization Stream Protocol. |
| * |
| * A Class instance is written initially into an ObjectOutputStream in the |
| * following format: |
| * <pre> |
| * {@code TC_CLASS} ClassDescriptor |
| * A ClassDescriptor is a special cased serialization of |
| * a {@code java.io.ObjectStreamClass} instance. |
| * </pre> |
| * A new handle is generated for the initial time the class descriptor |
| * is written into the stream. Future references to the class descriptor |
| * are written as references to the initial class descriptor instance. |
| * |
| * @see java.io.ObjectStreamClass |
| */ |
| private static final ObjectStreamField[] serialPersistentFields = |
| new ObjectStreamField[0]; |
| |
| |
| /** |
| * Returns the assertion status that would be assigned to this |
| * class if it were to be initialized at the time this method is invoked. |
| * If this class has had its assertion status set, the most recent |
| * setting will be returned; otherwise, if any package default assertion |
| * status pertains to this class, the most recent setting for the most |
| * specific pertinent package default assertion status is returned; |
| * otherwise, if this class is not a system class (i.e., it has a |
| * class loader) its class loader's default assertion status is returned; |
| * otherwise, the system class default assertion status is returned. |
| * <p> |
| * Few programmers will have any need for this method; it is provided |
| * for the benefit of the JRE itself. (It allows a class to determine at |
| * the time that it is initialized whether assertions should be enabled.) |
| * Note that this method is not guaranteed to return the actual |
| * assertion status that was (or will be) associated with the specified |
| * class when it was (or will be) initialized. |
| * |
| * @return the desired assertion status of the specified class. |
| * @see java.lang.ClassLoader#setClassAssertionStatus |
| * @see java.lang.ClassLoader#setPackageAssertionStatus |
| * @see java.lang.ClassLoader#setDefaultAssertionStatus |
| * @since 1.4 |
| */ |
| public boolean desiredAssertionStatus() { |
| ClassLoader loader = getClassLoader(); |
| // If the loader is null this is a system class, so ask the VM |
| if (loader == null) |
| return desiredAssertionStatus0(this); |
| |
| // If the classloader has been initialized with the assertion |
| // directives, ask it. Otherwise, ask the VM. |
| synchronized(loader.assertionLock) { |
| if (loader.classAssertionStatus != null) { |
| return loader.desiredAssertionStatus(getName()); |
| } |
| } |
| return desiredAssertionStatus0(this); |
| } |
| |
| // Retrieves the desired assertion status of this class from the VM |
| private static native boolean desiredAssertionStatus0(Class<?> clazz); |
| |
| /** |
| * Returns true if and only if this class was declared as an enum in the |
| * source code. |
| * |
| * @return true if and only if this class was declared as an enum in the |
| * source code |
| * @since 1.5 |
| */ |
| public boolean isEnum() { |
| // An enum must both directly extend java.lang.Enum and have |
| // the ENUM bit set; classes for specialized enum constants |
| // don't do the former. |
| return (this.getModifiers() & ENUM) != 0 && |
| this.getSuperclass() == java.lang.Enum.class; |
| } |
| |
| // Fetches the factory for reflective objects |
| private static ReflectionFactory getReflectionFactory() { |
| if (reflectionFactory == null) { |
| reflectionFactory = |
| java.security.AccessController.doPrivileged |
| (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction()); |
| } |
| return reflectionFactory; |
| } |
| private static ReflectionFactory reflectionFactory; |
| |
| // To be able to query system properties as soon as they're available |
| private static boolean initted = false; |
| private static void checkInitted() { |
| if (initted) return; |
| AccessController.doPrivileged(new PrivilegedAction<>() { |
| public Void run() { |
| // Tests to ensure the system properties table is fully |
| // initialized. This is needed because reflection code is |
| // called very early in the initialization process (before |
| // command-line arguments have been parsed and therefore |
| // these user-settable properties installed.) We assume that |
| // if System.out is non-null then the System class has been |
| // fully initialized and that the bulk of the startup code |
| // has been run. |
| |
| if (System.out == null) { |
| // java.lang.System not yet fully initialized |
| return null; |
| } |
| |
| // Doesn't use Boolean.getBoolean to avoid class init. |
| String val = |
| System.getProperty("sun.reflect.noCaches"); |
| if (val != null && val.equals("true")) { |
| useCaches = false; |
| } |
| |
| initted = true; |
| return null; |
| } |
| }); |
| } |
| |
| /** |
| * Returns the elements of this enum class or null if this |
| * Class object does not represent an enum type. |
| * |
| * @return an array containing the values comprising the enum class |
| * represented by this Class object in the order they're |
| * declared, or null if this Class object does not |
| * represent an enum type |
| * @since 1.5 |
| */ |
| public T[] getEnumConstants() { |
| T[] values = getEnumConstantsShared(); |
| return (values != null) ? values.clone() : null; |
| } |
| |
| /** |
| * Returns the elements of this enum class or null if this |
| * Class object does not represent an enum type; |
| * identical to getEnumConstants except that the result is |
| * uncloned, cached, and shared by all callers. |
| */ |
| T[] getEnumConstantsShared() { |
| T[] constants = enumConstants; |
| if (constants == null) { |
| if (!isEnum()) return null; |
| try { |
| final Method values = getMethod("values"); |
| java.security.AccessController.doPrivileged( |
| new java.security.PrivilegedAction<>() { |
| public Void run() { |
| values.setAccessible(true); |
| return null; |
| } |
| }); |
| @SuppressWarnings("unchecked") |
| T[] temporaryConstants = (T[])values.invoke(null); |
| enumConstants = constants = temporaryConstants; |
| } |
| // These can happen when users concoct enum-like classes |
| // that don't comply with the enum spec. |
| catch (InvocationTargetException | NoSuchMethodException | |
| IllegalAccessException ex) { return null; } |
| } |
| return constants; |
| } |
| private transient volatile T[] enumConstants; |
| |
| /** |
| * Returns a map from simple name to enum constant. This package-private |
| * method is used internally by Enum to implement |
| * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)} |
| * efficiently. Note that the map is returned by this method is |
| * created lazily on first use. Typically it won't ever get created. |
| */ |
| Map<String, T> enumConstantDirectory() { |
| Map<String, T> directory = enumConstantDirectory; |
| if (directory == null) { |
| T[] universe = getEnumConstantsShared(); |
| if (universe == null) |
| throw new IllegalArgumentException( |
| getName() + " is not an enum type"); |
| directory = new HashMap<>(2 * universe.length); |
| for (T constant : universe) { |
| directory.put(((Enum<?>)constant).name(), constant); |
| } |
| enumConstantDirectory = directory; |
| } |
| return directory; |
| } |
| private transient volatile Map<String, T> enumConstantDirectory; |
| |
| /** |
| * Casts an object to the class or interface represented |
| * by this {@code Class} object. |
| * |
| * @param obj the object to be cast |
| * @return the object after casting, or null if obj is null |
| * |
| * @throws ClassCastException if the object is not |
| * null and is not assignable to the type T. |
| * |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| @HotSpotIntrinsicCandidate |
| public T cast(Object obj) { |
| if (obj != null && !isInstance(obj)) |
| throw new ClassCastException(cannotCastMsg(obj)); |
| return (T) obj; |
| } |
| |
| private String cannotCastMsg(Object obj) { |
| return "Cannot cast " + obj.getClass().getName() + " to " + getName(); |
| } |
| |
| /** |
| * Casts this {@code Class} object to represent a subclass of the class |
| * represented by the specified class object. Checks that the cast |
| * is valid, and throws a {@code ClassCastException} if it is not. If |
| * this method succeeds, it always returns a reference to this class object. |
| * |
| * <p>This method is useful when a client needs to "narrow" the type of |
| * a {@code Class} object to pass it to an API that restricts the |
| * {@code Class} objects that it is willing to accept. A cast would |
| * generate a compile-time warning, as the correctness of the cast |
| * could not be checked at runtime (because generic types are implemented |
| * by erasure). |
| * |
| * @param <U> the type to cast this class object to |
| * @param clazz the class of the type to cast this class object to |
| * @return this {@code Class} object, cast to represent a subclass of |
| * the specified class object. |
| * @throws ClassCastException if this {@code Class} object does not |
| * represent a subclass of the specified class (here "subclass" includes |
| * the class itself). |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| public <U> Class<? extends U> asSubclass(Class<U> clazz) { |
| if (clazz.isAssignableFrom(this)) |
| return (Class<? extends U>) this; |
| else |
| throw new ClassCastException(this.toString()); |
| } |
| |
| /** |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| public <A extends Annotation> A getAnnotation(Class<A> annotationClass) { |
| Objects.requireNonNull(annotationClass); |
| |
| return (A) annotationData().annotations.get(annotationClass); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) { |
| return GenericDeclaration.super.isAnnotationPresent(annotationClass); |
| } |
| |
| /** |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) { |
| Objects.requireNonNull(annotationClass); |
| |
| AnnotationData annotationData = annotationData(); |
| return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations, |
| this, |
| annotationClass); |
| } |
| |
| /** |
| * @since 1.5 |
| */ |
| public Annotation[] getAnnotations() { |
| return AnnotationParser.toArray(annotationData().annotations); |
| } |
| |
| /** |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| @SuppressWarnings("unchecked") |
| public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) { |
| Objects.requireNonNull(annotationClass); |
| |
| return (A) annotationData().declaredAnnotations.get(annotationClass); |
| } |
| |
| /** |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) { |
| Objects.requireNonNull(annotationClass); |
| |
| return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations, |
| annotationClass); |
| } |
| |
| /** |
| * @since 1.5 |
| */ |
| public Annotation[] getDeclaredAnnotations() { |
| return AnnotationParser.toArray(annotationData().declaredAnnotations); |
| } |
| |
| // annotation data that might get invalidated when JVM TI RedefineClasses() is called |
| private static class AnnotationData { |
| final Map<Class<? extends Annotation>, Annotation> annotations; |
| final Map<Class<? extends Annotation>, Annotation> declaredAnnotations; |
| |
| // Value of classRedefinedCount when we created this AnnotationData instance |
| final int redefinedCount; |
| |
| AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations, |
| Map<Class<? extends Annotation>, Annotation> declaredAnnotations, |
| int redefinedCount) { |
| this.annotations = annotations; |
| this.declaredAnnotations = declaredAnnotations; |
| this.redefinedCount = redefinedCount; |
| } |
| } |
| |
| // Annotations cache |
| @SuppressWarnings("UnusedDeclaration") |
| private transient volatile AnnotationData annotationData; |
| |
| private AnnotationData annotationData() { |
| while (true) { // retry loop |
| AnnotationData annotationData = this.annotationData; |
| int classRedefinedCount = this.classRedefinedCount; |
| if (annotationData != null && |
| annotationData.redefinedCount == classRedefinedCount) { |
| return annotationData; |
| } |
| // null or stale annotationData -> optimistically create new instance |
| AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount); |
| // try to install it |
| if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) { |
| // successfully installed new AnnotationData |
| return newAnnotationData; |
| } |
| } |
| } |
| |
| private AnnotationData createAnnotationData(int classRedefinedCount) { |
| Map<Class<? extends Annotation>, Annotation> declaredAnnotations = |
| AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this); |
| Class<?> superClass = getSuperclass(); |
| Map<Class<? extends Annotation>, Annotation> annotations = null; |
| if (superClass != null) { |
| Map<Class<? extends Annotation>, Annotation> superAnnotations = |
| superClass.annotationData().annotations; |
| for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) { |
| Class<? extends Annotation> annotationClass = e.getKey(); |
| if (AnnotationType.getInstance(annotationClass).isInherited()) { |
| if (annotations == null) { // lazy construction |
| annotations = new LinkedHashMap<>((Math.max( |
| declaredAnnotations.size(), |
| Math.min(12, declaredAnnotations.size() + superAnnotations.size()) |
| ) * 4 + 2) / 3 |
| ); |
| } |
| annotations.put(annotationClass, e.getValue()); |
| } |
| } |
| } |
| if (annotations == null) { |
| // no inherited annotations -> share the Map with declaredAnnotations |
| annotations = declaredAnnotations; |
| } else { |
| // at least one inherited annotation -> declared may override inherited |
| annotations.putAll(declaredAnnotations); |
| } |
| return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount); |
| } |
| |
| // Annotation types cache their internal (AnnotationType) form |
| |
| @SuppressWarnings("UnusedDeclaration") |
| private transient volatile AnnotationType annotationType; |
| |
| boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) { |
| return Atomic.casAnnotationType(this, oldType, newType); |
| } |
| |
| AnnotationType getAnnotationType() { |
| return annotationType; |
| } |
| |
| Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() { |
| return annotationData().declaredAnnotations; |
| } |
| |
| /* Backing store of user-defined values pertaining to this class. |
| * Maintained by the ClassValue class. |
| */ |
| transient ClassValue.ClassValueMap classValueMap; |
| |
| /** |
| * Returns an {@code AnnotatedType} object that represents the use of a |
| * type to specify the superclass of the entity represented by this {@code |
| * Class} object. (The <em>use</em> of type Foo to specify the superclass |
| * in '... extends Foo' is distinct from the <em>declaration</em> of type |
| * Foo.) |
| * |
| * <p> If this {@code Class} object represents a type whose declaration |
| * does not explicitly indicate an annotated superclass, then the return |
| * value is an {@code AnnotatedType} object representing an element with no |
| * annotations. |
| * |
| * <p> If this {@code Class} represents either the {@code Object} class, an |
| * interface type, an array type, a primitive type, or void, the return |
| * value is {@code null}. |
| * |
| * @return an object representing the superclass |
| * @since 1.8 |
| */ |
| public AnnotatedType getAnnotatedSuperclass() { |
| if (this == Object.class || |
| isInterface() || |
| isArray() || |
| isPrimitive() || |
| this == Void.TYPE) { |
| return null; |
| } |
| |
| return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this); |
| } |
| |
| /** |
| * Returns an array of {@code AnnotatedType} objects that represent the use |
| * of types to specify superinterfaces of the entity represented by this |
| * {@code Class} object. (The <em>use</em> of type Foo to specify a |
| * superinterface in '... implements Foo' is distinct from the |
| * <em>declaration</em> of type Foo.) |
| * |
| * <p> If this {@code Class} object represents a class, the return value is |
| * an array containing objects representing the uses of interface types to |
| * specify interfaces implemented by the class. The order of the objects in |
| * the array corresponds to the order of the interface types used in the |
| * 'implements' clause of the declaration of this {@code Class} object. |
| * |
| * <p> If this {@code Class} object represents an interface, the return |
| * value is an array containing objects representing the uses of interface |
| * types to specify interfaces directly extended by the interface. The |
| * order of the objects in the array corresponds to the order of the |
| * interface types used in the 'extends' clause of the declaration of this |
| * {@code Class} object. |
| * |
| * <p> If this {@code Class} object represents a class or interface whose |
| * declaration does not explicitly indicate any annotated superinterfaces, |
| * the return value is an array of length 0. |
| * |
| * <p> If this {@code Class} object represents either the {@code Object} |
| * class, an array type, a primitive type, or void, the return value is an |
| * array of length 0. |
| * |
| * @return an array representing the superinterfaces |
| * @since 1.8 |
| */ |
| public AnnotatedType[] getAnnotatedInterfaces() { |
| return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this); |
| } |
| } |