| /* |
| * Copyright (c) 1996, 2017, 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.reflect; |
| |
| import jdk.internal.misc.SharedSecrets; |
| import jdk.internal.reflect.CallerSensitive; |
| import jdk.internal.reflect.ConstructorAccessor; |
| import jdk.internal.reflect.Reflection; |
| import jdk.internal.vm.annotation.ForceInline; |
| import sun.reflect.annotation.TypeAnnotation; |
| import sun.reflect.annotation.TypeAnnotationParser; |
| import sun.reflect.generics.repository.ConstructorRepository; |
| import sun.reflect.generics.factory.CoreReflectionFactory; |
| import sun.reflect.generics.factory.GenericsFactory; |
| import sun.reflect.generics.scope.ConstructorScope; |
| import java.lang.annotation.Annotation; |
| import java.lang.annotation.AnnotationFormatError; |
| import java.util.StringJoiner; |
| |
| /** |
| * {@code Constructor} provides information about, and access to, a single |
| * constructor for a class. |
| * |
| * <p>{@code Constructor} permits widening conversions to occur when matching the |
| * actual parameters to newInstance() with the underlying |
| * constructor's formal parameters, but throws an |
| * {@code IllegalArgumentException} if a narrowing conversion would occur. |
| * |
| * @param <T> the class in which the constructor is declared |
| * |
| * @see Member |
| * @see java.lang.Class |
| * @see java.lang.Class#getConstructors() |
| * @see java.lang.Class#getConstructor(Class[]) |
| * @see java.lang.Class#getDeclaredConstructors() |
| * |
| * @author Kenneth Russell |
| * @author Nakul Saraiya |
| * @since 1.1 |
| */ |
| public final class Constructor<T> extends Executable { |
| private Class<T> clazz; |
| private int slot; |
| private Class<?>[] parameterTypes; |
| private Class<?>[] exceptionTypes; |
| private int modifiers; |
| // Generics and annotations support |
| private transient String signature; |
| // generic info repository; lazily initialized |
| private transient ConstructorRepository genericInfo; |
| private byte[] annotations; |
| private byte[] parameterAnnotations; |
| |
| // Generics infrastructure |
| // Accessor for factory |
| private GenericsFactory getFactory() { |
| // create scope and factory |
| return CoreReflectionFactory.make(this, ConstructorScope.make(this)); |
| } |
| |
| // Accessor for generic info repository |
| @Override |
| ConstructorRepository getGenericInfo() { |
| // lazily initialize repository if necessary |
| if (genericInfo == null) { |
| // create and cache generic info repository |
| genericInfo = |
| ConstructorRepository.make(getSignature(), |
| getFactory()); |
| } |
| return genericInfo; //return cached repository |
| } |
| |
| private volatile ConstructorAccessor constructorAccessor; |
| // For sharing of ConstructorAccessors. This branching structure |
| // is currently only two levels deep (i.e., one root Constructor |
| // and potentially many Constructor objects pointing to it.) |
| // |
| // If this branching structure would ever contain cycles, deadlocks can |
| // occur in annotation code. |
| private Constructor<T> root; |
| |
| /** |
| * Used by Excecutable for annotation sharing. |
| */ |
| @Override |
| Executable getRoot() { |
| return root; |
| } |
| |
| /** |
| * Package-private constructor used by ReflectAccess to enable |
| * instantiation of these objects in Java code from the java.lang |
| * package via sun.reflect.LangReflectAccess. |
| */ |
| Constructor(Class<T> declaringClass, |
| Class<?>[] parameterTypes, |
| Class<?>[] checkedExceptions, |
| int modifiers, |
| int slot, |
| String signature, |
| byte[] annotations, |
| byte[] parameterAnnotations) { |
| this.clazz = declaringClass; |
| this.parameterTypes = parameterTypes; |
| this.exceptionTypes = checkedExceptions; |
| this.modifiers = modifiers; |
| this.slot = slot; |
| this.signature = signature; |
| this.annotations = annotations; |
| this.parameterAnnotations = parameterAnnotations; |
| } |
| |
| /** |
| * Package-private routine (exposed to java.lang.Class via |
| * ReflectAccess) which returns a copy of this Constructor. The copy's |
| * "root" field points to this Constructor. |
| */ |
| Constructor<T> copy() { |
| // This routine enables sharing of ConstructorAccessor objects |
| // among Constructor objects which refer to the same underlying |
| // method in the VM. (All of this contortion is only necessary |
| // because of the "accessibility" bit in AccessibleObject, |
| // which implicitly requires that new java.lang.reflect |
| // objects be fabricated for each reflective call on Class |
| // objects.) |
| if (this.root != null) |
| throw new IllegalArgumentException("Can not copy a non-root Constructor"); |
| |
| Constructor<T> res = new Constructor<>(clazz, |
| parameterTypes, |
| exceptionTypes, modifiers, slot, |
| signature, |
| annotations, |
| parameterAnnotations); |
| res.root = this; |
| // Might as well eagerly propagate this if already present |
| res.constructorAccessor = constructorAccessor; |
| return res; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <p> A {@code SecurityException} is also thrown if this object is a |
| * {@code Constructor} object for the class {@code Class} and {@code flag} |
| * is true. </p> |
| * |
| * @param flag {@inheritDoc} |
| * |
| * @throws InaccessibleObjectException {@inheritDoc} |
| * @throws SecurityException if the request is denied by the security manager |
| * or this is a constructor for {@code java.lang.Class} |
| * |
| * @spec JPMS |
| */ |
| @Override |
| @CallerSensitive |
| public void setAccessible(boolean flag) { |
| AccessibleObject.checkPermission(); |
| if (flag) { |
| checkCanSetAccessible(Reflection.getCallerClass()); |
| } |
| setAccessible0(flag); |
| } |
| |
| @Override |
| void checkCanSetAccessible(Class<?> caller) { |
| checkCanSetAccessible(caller, clazz); |
| if (clazz == Class.class) { |
| // can we change this to InaccessibleObjectException? |
| throw new SecurityException("Cannot make a java.lang.Class" |
| + " constructor accessible"); |
| } |
| } |
| |
| @Override |
| boolean hasGenericInformation() { |
| return (getSignature() != null); |
| } |
| |
| @Override |
| byte[] getAnnotationBytes() { |
| return annotations; |
| } |
| |
| /** |
| * Returns the {@code Class} object representing the class that |
| * declares the constructor represented by this object. |
| */ |
| @Override |
| public Class<T> getDeclaringClass() { |
| return clazz; |
| } |
| |
| /** |
| * Returns the name of this constructor, as a string. This is |
| * the binary name of the constructor's declaring class. |
| */ |
| @Override |
| public String getName() { |
| return getDeclaringClass().getName(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public int getModifiers() { |
| return modifiers; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @throws GenericSignatureFormatError {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| @SuppressWarnings({"rawtypes", "unchecked"}) |
| public TypeVariable<Constructor<T>>[] getTypeParameters() { |
| if (getSignature() != null) { |
| return (TypeVariable<Constructor<T>>[])getGenericInfo().getTypeParameters(); |
| } else |
| return (TypeVariable<Constructor<T>>[])new TypeVariable[0]; |
| } |
| |
| |
| @Override |
| Class<?>[] getSharedParameterTypes() { |
| return parameterTypes; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Class<?>[] getParameterTypes() { |
| return parameterTypes.clone(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.8 |
| */ |
| public int getParameterCount() { return parameterTypes.length; } |
| |
| /** |
| * {@inheritDoc} |
| * @throws GenericSignatureFormatError {@inheritDoc} |
| * @throws TypeNotPresentException {@inheritDoc} |
| * @throws MalformedParameterizedTypeException {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| public Type[] getGenericParameterTypes() { |
| return super.getGenericParameterTypes(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Class<?>[] getExceptionTypes() { |
| return exceptionTypes.clone(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| * @throws GenericSignatureFormatError {@inheritDoc} |
| * @throws TypeNotPresentException {@inheritDoc} |
| * @throws MalformedParameterizedTypeException {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| public Type[] getGenericExceptionTypes() { |
| return super.getGenericExceptionTypes(); |
| } |
| |
| /** |
| * Compares this {@code Constructor} against the specified object. |
| * Returns true if the objects are the same. Two {@code Constructor} objects are |
| * the same if they were declared by the same class and have the |
| * same formal parameter types. |
| */ |
| public boolean equals(Object obj) { |
| if (obj != null && obj instanceof Constructor) { |
| Constructor<?> other = (Constructor<?>)obj; |
| if (getDeclaringClass() == other.getDeclaringClass()) { |
| return equalParamTypes(parameterTypes, other.parameterTypes); |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Returns a hashcode for this {@code Constructor}. The hashcode is |
| * the same as the hashcode for the underlying constructor's |
| * declaring class name. |
| */ |
| public int hashCode() { |
| return getDeclaringClass().getName().hashCode(); |
| } |
| |
| /** |
| * Returns a string describing this {@code Constructor}. The string is |
| * formatted as the constructor access modifiers, if any, |
| * followed by the fully-qualified name of the declaring class, |
| * followed by a parenthesized, comma-separated list of the |
| * constructor's formal parameter types. For example: |
| * <pre>{@code |
| * public java.util.Hashtable(int,float) |
| * }</pre> |
| * |
| * <p>If the constructor is declared to throw exceptions, the |
| * parameter list is followed by a space, followed by the word |
| * "{@code throws}" followed by a comma-separated list of the |
| * thrown exception types. |
| * |
| * <p>The only possible modifiers for constructors are the access |
| * modifiers {@code public}, {@code protected} or |
| * {@code private}. Only one of these may appear, or none if the |
| * constructor has default (package) access. |
| * |
| * @return a string describing this {@code Constructor} |
| * @jls 8.8.3 Constructor Modifiers |
| * @jls 8.9.2 Enum Body Declarations |
| */ |
| public String toString() { |
| return sharedToString(Modifier.constructorModifiers(), |
| false, |
| parameterTypes, |
| exceptionTypes); |
| } |
| |
| @Override |
| void specificToStringHeader(StringBuilder sb) { |
| sb.append(getDeclaringClass().getTypeName()); |
| } |
| |
| @Override |
| String toShortString() { |
| StringBuilder sb = new StringBuilder("constructor "); |
| sb.append(getDeclaringClass().getTypeName()); |
| sb.append('('); |
| StringJoiner sj = new StringJoiner(","); |
| for (Class<?> parameterType : getParameterTypes()) { |
| sj.add(parameterType.getTypeName()); |
| } |
| sb.append(sj); |
| sb.append(')'); |
| return sb.toString(); |
| } |
| |
| /** |
| * Returns a string describing this {@code Constructor}, |
| * including type parameters. The string is formatted as the |
| * constructor access modifiers, if any, followed by an |
| * angle-bracketed comma separated list of the constructor's type |
| * parameters, if any, followed by the fully-qualified name of the |
| * declaring class, followed by a parenthesized, comma-separated |
| * list of the constructor's generic formal parameter types. |
| * |
| * If this constructor was declared to take a variable number of |
| * arguments, instead of denoting the last parameter as |
| * "<code><i>Type</i>[]</code>", it is denoted as |
| * "<code><i>Type</i>...</code>". |
| * |
| * A space is used to separate access modifiers from one another |
| * and from the type parameters or class name. If there are no |
| * type parameters, the type parameter list is elided; if the type |
| * parameter list is present, a space separates the list from the |
| * class name. If the constructor is declared to throw |
| * exceptions, the parameter list is followed by a space, followed |
| * by the word "{@code throws}" followed by a |
| * comma-separated list of the generic thrown exception types. |
| * |
| * <p>The only possible modifiers for constructors are the access |
| * modifiers {@code public}, {@code protected} or |
| * {@code private}. Only one of these may appear, or none if the |
| * constructor has default (package) access. |
| * |
| * @return a string describing this {@code Constructor}, |
| * include type parameters |
| * |
| * @since 1.5 |
| * @jls 8.8.3 Constructor Modifiers |
| * @jls 8.9.2 Enum Body Declarations |
| */ |
| @Override |
| public String toGenericString() { |
| return sharedToGenericString(Modifier.constructorModifiers(), false); |
| } |
| |
| @Override |
| void specificToGenericStringHeader(StringBuilder sb) { |
| specificToStringHeader(sb); |
| } |
| |
| /** |
| * Uses the constructor represented by this {@code Constructor} object to |
| * create and initialize a new instance of the constructor's |
| * declaring class, with the specified initialization parameters. |
| * Individual parameters are automatically unwrapped to match |
| * primitive formal parameters, and both primitive and reference |
| * parameters are subject to method invocation conversions as necessary. |
| * |
| * <p>If the number of formal parameters required by the underlying constructor |
| * is 0, the supplied {@code initargs} array may be of length 0 or null. |
| * |
| * <p>If the constructor's declaring class is an inner class in a |
| * non-static context, the first argument to the constructor needs |
| * to be the enclosing instance; see section 15.9.3 of |
| * <cite>The Java™ Language Specification</cite>. |
| * |
| * <p>If the required access and argument checks succeed and the |
| * instantiation will proceed, the constructor's declaring class |
| * is initialized if it has not already been initialized. |
| * |
| * <p>If the constructor completes normally, returns the newly |
| * created and initialized instance. |
| * |
| * @param initargs array of objects to be passed as arguments to |
| * the constructor call; values of primitive types are wrapped in |
| * a wrapper object of the appropriate type (e.g. a {@code float} |
| * in a {@link java.lang.Float Float}) |
| * |
| * @return a new object created by calling the constructor |
| * this object represents |
| * |
| * @exception IllegalAccessException if this {@code Constructor} object |
| * is enforcing Java language access control and the underlying |
| * constructor is inaccessible. |
| * @exception IllegalArgumentException if the number of actual |
| * and formal parameters differ; if an unwrapping |
| * conversion for primitive arguments fails; or if, |
| * after possible unwrapping, a parameter value |
| * cannot be converted to the corresponding formal |
| * parameter type by a method invocation conversion; if |
| * this constructor pertains to an enum type. |
| * @exception InstantiationException if the class that declares the |
| * underlying constructor represents an abstract class. |
| * @exception InvocationTargetException if the underlying constructor |
| * throws an exception. |
| * @exception ExceptionInInitializerError if the initialization provoked |
| * by this method fails. |
| */ |
| @CallerSensitive |
| @ForceInline // to ensure Reflection.getCallerClass optimization |
| public T newInstance(Object ... initargs) |
| throws InstantiationException, IllegalAccessException, |
| IllegalArgumentException, InvocationTargetException |
| { |
| if (!override) { |
| Class<?> caller = Reflection.getCallerClass(); |
| checkAccess(caller, clazz, clazz, modifiers); |
| } |
| if ((clazz.getModifiers() & Modifier.ENUM) != 0) |
| throw new IllegalArgumentException("Cannot reflectively create enum objects"); |
| ConstructorAccessor ca = constructorAccessor; // read volatile |
| if (ca == null) { |
| ca = acquireConstructorAccessor(); |
| } |
| @SuppressWarnings("unchecked") |
| T inst = (T) ca.newInstance(initargs); |
| return inst; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| public boolean isVarArgs() { |
| return super.isVarArgs(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @jls 13.1 The Form of a Binary |
| * @since 1.5 |
| */ |
| @Override |
| public boolean isSynthetic() { |
| return super.isSynthetic(); |
| } |
| |
| // NOTE that there is no synchronization used here. It is correct |
| // (though not efficient) to generate more than one |
| // ConstructorAccessor for a given Constructor. However, avoiding |
| // synchronization will probably make the implementation more |
| // scalable. |
| private ConstructorAccessor acquireConstructorAccessor() { |
| // First check to see if one has been created yet, and take it |
| // if so. |
| ConstructorAccessor tmp = null; |
| if (root != null) tmp = root.getConstructorAccessor(); |
| if (tmp != null) { |
| constructorAccessor = tmp; |
| } else { |
| // Otherwise fabricate one and propagate it up to the root |
| tmp = reflectionFactory.newConstructorAccessor(this); |
| setConstructorAccessor(tmp); |
| } |
| |
| return tmp; |
| } |
| |
| // Returns ConstructorAccessor for this Constructor object, not |
| // looking up the chain to the root |
| ConstructorAccessor getConstructorAccessor() { |
| return constructorAccessor; |
| } |
| |
| // Sets the ConstructorAccessor for this Constructor object and |
| // (recursively) its root |
| void setConstructorAccessor(ConstructorAccessor accessor) { |
| constructorAccessor = accessor; |
| // Propagate up |
| if (root != null) { |
| root.setConstructorAccessor(accessor); |
| } |
| } |
| |
| int getSlot() { |
| return slot; |
| } |
| |
| String getSignature() { |
| return signature; |
| } |
| |
| byte[] getRawAnnotations() { |
| return annotations; |
| } |
| |
| byte[] getRawParameterAnnotations() { |
| return parameterAnnotations; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.5 |
| */ |
| public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { |
| return super.getAnnotation(annotationClass); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.5 |
| */ |
| public Annotation[] getDeclaredAnnotations() { |
| return super.getDeclaredAnnotations(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| public Annotation[][] getParameterAnnotations() { |
| return sharedGetParameterAnnotations(parameterTypes, parameterAnnotations); |
| } |
| |
| @Override |
| boolean handleParameterNumberMismatch(int resultLength, int numParameters) { |
| Class<?> declaringClass = getDeclaringClass(); |
| if (declaringClass.isEnum() || |
| declaringClass.isAnonymousClass() || |
| declaringClass.isLocalClass() ) |
| return false; // Can't do reliable parameter counting |
| else { |
| if (declaringClass.isMemberClass() && |
| ((declaringClass.getModifiers() & Modifier.STATIC) == 0) && |
| resultLength + 1 == numParameters) { |
| return true; |
| } else { |
| throw new AnnotationFormatError( |
| "Parameter annotations don't match number of parameters"); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| public AnnotatedType getAnnotatedReturnType() { |
| return getAnnotatedReturnType0(getDeclaringClass()); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| public AnnotatedType getAnnotatedReceiverType() { |
| Class<?> thisDeclClass = getDeclaringClass(); |
| Class<?> enclosingClass = thisDeclClass.getEnclosingClass(); |
| |
| if (enclosingClass == null) { |
| // A Constructor for a top-level class |
| return null; |
| } |
| |
| Class<?> outerDeclaringClass = thisDeclClass.getDeclaringClass(); |
| if (outerDeclaringClass == null) { |
| // A constructor for a local or anonymous class |
| return null; |
| } |
| |
| // Either static nested or inner class |
| if (Modifier.isStatic(thisDeclClass.getModifiers())) { |
| // static nested |
| return null; |
| } |
| |
| // A Constructor for an inner class |
| return TypeAnnotationParser.buildAnnotatedType(getTypeAnnotationBytes0(), |
| SharedSecrets.getJavaLangAccess(). |
| getConstantPool(thisDeclClass), |
| this, |
| thisDeclClass, |
| enclosingClass, |
| TypeAnnotation.TypeAnnotationTarget.METHOD_RECEIVER); |
| } |
| } |