J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.lang; |
| 27 | |
| 28 | import java.lang.reflect.Array; |
| 29 | import java.lang.reflect.GenericArrayType; |
| 30 | import java.lang.reflect.Member; |
| 31 | import java.lang.reflect.Field; |
| 32 | import java.lang.reflect.Method; |
| 33 | import java.lang.reflect.Constructor; |
| 34 | import java.lang.reflect.GenericDeclaration; |
| 35 | import java.lang.reflect.Modifier; |
| 36 | import java.lang.reflect.Type; |
| 37 | import java.lang.reflect.TypeVariable; |
| 38 | import java.lang.reflect.InvocationTargetException; |
| 39 | import java.lang.ref.SoftReference; |
| 40 | import java.io.InputStream; |
| 41 | import java.io.ObjectStreamField; |
| 42 | import java.security.AccessController; |
| 43 | import java.security.PrivilegedAction; |
| 44 | import java.util.ArrayList; |
| 45 | import java.util.Arrays; |
| 46 | import java.util.Collection; |
| 47 | import java.util.HashSet; |
| 48 | import java.util.Iterator; |
| 49 | import java.util.List; |
| 50 | import java.util.LinkedList; |
| 51 | import java.util.LinkedHashSet; |
| 52 | import java.util.Set; |
| 53 | import java.util.Map; |
| 54 | import java.util.HashMap; |
| 55 | import sun.misc.Unsafe; |
| 56 | import sun.reflect.ConstantPool; |
| 57 | import sun.reflect.Reflection; |
| 58 | import sun.reflect.ReflectionFactory; |
| 59 | import sun.reflect.SignatureIterator; |
| 60 | import sun.reflect.generics.factory.CoreReflectionFactory; |
| 61 | import sun.reflect.generics.factory.GenericsFactory; |
| 62 | import sun.reflect.generics.repository.ClassRepository; |
| 63 | import sun.reflect.generics.repository.MethodRepository; |
| 64 | import sun.reflect.generics.repository.ConstructorRepository; |
| 65 | import sun.reflect.generics.scope.ClassScope; |
| 66 | import sun.security.util.SecurityConstants; |
| 67 | import java.lang.annotation.Annotation; |
| 68 | import sun.reflect.annotation.*; |
| 69 | |
| 70 | /** |
| 71 | * Instances of the class {@code Class} represent classes and |
| 72 | * interfaces in a running Java application. An enum is a kind of |
| 73 | * class and an annotation is a kind of interface. Every array also |
| 74 | * belongs to a class that is reflected as a {@code Class} object |
| 75 | * that is shared by all arrays with the same element type and number |
| 76 | * of dimensions. The primitive Java types ({@code boolean}, |
| 77 | * {@code byte}, {@code char}, {@code short}, |
| 78 | * {@code int}, {@code long}, {@code float}, and |
| 79 | * {@code double}), and the keyword {@code void} are also |
| 80 | * represented as {@code Class} objects. |
| 81 | * |
| 82 | * <p> {@code Class} has no public constructor. Instead {@code Class} |
| 83 | * objects are constructed automatically by the Java Virtual Machine as classes |
| 84 | * are loaded and by calls to the {@code defineClass} method in the class |
| 85 | * loader. |
| 86 | * |
| 87 | * <p> The following example uses a {@code Class} object to print the |
| 88 | * class name of an object: |
| 89 | * |
| 90 | * <p> <blockquote><pre> |
| 91 | * void printClassName(Object obj) { |
| 92 | * System.out.println("The class of " + obj + |
| 93 | * " is " + obj.getClass().getName()); |
| 94 | * } |
| 95 | * </pre></blockquote> |
| 96 | * |
| 97 | * <p> It is also possible to get the {@code Class} object for a named |
| 98 | * type (or for void) using a class literal |
| 99 | * (JLS Section <A HREF="http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#251530">15.8.2</A>). |
| 100 | * For example: |
| 101 | * |
| 102 | * <p> <blockquote> |
| 103 | * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} |
| 104 | * </blockquote> |
| 105 | * |
| 106 | * @param <T> the type of the class modeled by this {@code Class} |
| 107 | * object. For example, the type of {@code String.class} is {@code |
| 108 | * Class<String>}. Use {@code Class<?>} if the class being modeled is |
| 109 | * unknown. |
| 110 | * |
| 111 | * @author unascribed |
| 112 | * @see java.lang.ClassLoader#defineClass(byte[], int, int) |
| 113 | * @since JDK1.0 |
| 114 | */ |
| 115 | public final |
| 116 | class Class<T> implements java.io.Serializable, |
| 117 | java.lang.reflect.GenericDeclaration, |
| 118 | java.lang.reflect.Type, |
| 119 | java.lang.reflect.AnnotatedElement { |
| 120 | private static final int ANNOTATION= 0x00002000; |
| 121 | private static final int ENUM = 0x00004000; |
| 122 | private static final int SYNTHETIC = 0x00001000; |
| 123 | |
| 124 | private static native void registerNatives(); |
| 125 | static { |
| 126 | registerNatives(); |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * Constructor. Only the Java Virtual Machine creates Class |
| 131 | * objects. |
| 132 | */ |
| 133 | private Class() {} |
| 134 | |
| 135 | |
| 136 | /** |
| 137 | * Converts the object to a string. The string representation is the |
| 138 | * string "class" or "interface", followed by a space, and then by the |
| 139 | * fully qualified name of the class in the format returned by |
| 140 | * {@code getName}. If this {@code Class} object represents a |
| 141 | * primitive type, this method returns the name of the primitive type. If |
| 142 | * this {@code Class} object represents void this method returns |
| 143 | * "void". |
| 144 | * |
| 145 | * @return a string representation of this class object. |
| 146 | */ |
| 147 | public String toString() { |
| 148 | return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) |
| 149 | + getName(); |
| 150 | } |
| 151 | |
| 152 | |
| 153 | /** |
| 154 | * Returns the {@code Class} object associated with the class or |
| 155 | * interface with the given string name. Invoking this method is |
| 156 | * equivalent to: |
| 157 | * |
| 158 | * <blockquote> |
| 159 | * {@code Class.forName(className, true, currentLoader)} |
| 160 | * </blockquote> |
| 161 | * |
| 162 | * where {@code currentLoader} denotes the defining class loader of |
| 163 | * the current class. |
| 164 | * |
| 165 | * <p> For example, the following code fragment returns the |
| 166 | * runtime {@code Class} descriptor for the class named |
| 167 | * {@code java.lang.Thread}: |
| 168 | * |
| 169 | * <blockquote> |
| 170 | * {@code Class t = Class.forName("java.lang.Thread")} |
| 171 | * </blockquote> |
| 172 | * <p> |
| 173 | * A call to {@code forName("X")} causes the class named |
| 174 | * {@code X} to be initialized. |
| 175 | * |
| 176 | * @param className the fully qualified name of the desired class. |
| 177 | * @return the {@code Class} object for the class with the |
| 178 | * specified name. |
| 179 | * @exception LinkageError if the linkage fails |
| 180 | * @exception ExceptionInInitializerError if the initialization provoked |
| 181 | * by this method fails |
| 182 | * @exception ClassNotFoundException if the class cannot be located |
| 183 | */ |
| 184 | public static Class<?> forName(String className) |
| 185 | throws ClassNotFoundException { |
| 186 | return forName0(className, true, ClassLoader.getCallerClassLoader()); |
| 187 | } |
| 188 | |
| 189 | |
| 190 | /** |
| 191 | * Returns the {@code Class} object associated with the class or |
| 192 | * interface with the given string name, using the given class loader. |
| 193 | * Given the fully qualified name for a class or interface (in the same |
| 194 | * format returned by {@code getName}) this method attempts to |
| 195 | * locate, load, and link the class or interface. The specified class |
| 196 | * loader is used to load the class or interface. If the parameter |
| 197 | * {@code loader} is null, the class is loaded through the bootstrap |
| 198 | * class loader. The class is initialized only if the |
| 199 | * {@code initialize} parameter is {@code true} and if it has |
| 200 | * not been initialized earlier. |
| 201 | * |
| 202 | * <p> If {@code name} denotes a primitive type or void, an attempt |
| 203 | * will be made to locate a user-defined class in the unnamed package whose |
| 204 | * name is {@code name}. Therefore, this method cannot be used to |
| 205 | * obtain any of the {@code Class} objects representing primitive |
| 206 | * types or void. |
| 207 | * |
| 208 | * <p> If {@code name} denotes an array class, the component type of |
| 209 | * the array class is loaded but not initialized. |
| 210 | * |
| 211 | * <p> For example, in an instance method the expression: |
| 212 | * |
| 213 | * <blockquote> |
| 214 | * {@code Class.forName("Foo")} |
| 215 | * </blockquote> |
| 216 | * |
| 217 | * is equivalent to: |
| 218 | * |
| 219 | * <blockquote> |
| 220 | * {@code Class.forName("Foo", true, this.getClass().getClassLoader())} |
| 221 | * </blockquote> |
| 222 | * |
| 223 | * Note that this method throws errors related to loading, linking or |
| 224 | * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The |
| 225 | * Java Language Specification</em>. |
| 226 | * Note that this method does not check whether the requested class |
| 227 | * is accessible to its caller. |
| 228 | * |
| 229 | * <p> If the {@code loader} is {@code null}, and a security |
| 230 | * manager is present, and the caller's class loader is not null, then this |
| 231 | * method calls the security manager's {@code checkPermission} method |
| 232 | * with a {@code RuntimePermission("getClassLoader")} permission to |
| 233 | * ensure it's ok to access the bootstrap class loader. |
| 234 | * |
| 235 | * @param name fully qualified name of the desired class |
| 236 | * @param initialize whether the class must be initialized |
| 237 | * @param loader class loader from which the class must be loaded |
| 238 | * @return class object representing the desired class |
| 239 | * |
| 240 | * @exception LinkageError if the linkage fails |
| 241 | * @exception ExceptionInInitializerError if the initialization provoked |
| 242 | * by this method fails |
| 243 | * @exception ClassNotFoundException if the class cannot be located by |
| 244 | * the specified class loader |
| 245 | * |
| 246 | * @see java.lang.Class#forName(String) |
| 247 | * @see java.lang.ClassLoader |
| 248 | * @since 1.2 |
| 249 | */ |
| 250 | public static Class<?> forName(String name, boolean initialize, |
| 251 | ClassLoader loader) |
| 252 | throws ClassNotFoundException |
| 253 | { |
| 254 | if (loader == null) { |
| 255 | SecurityManager sm = System.getSecurityManager(); |
| 256 | if (sm != null) { |
| 257 | ClassLoader ccl = ClassLoader.getCallerClassLoader(); |
| 258 | if (ccl != null) { |
| 259 | sm.checkPermission( |
| 260 | SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| 261 | } |
| 262 | } |
| 263 | } |
| 264 | return forName0(name, initialize, loader); |
| 265 | } |
| 266 | |
| 267 | /** Called after security checks have been made. */ |
| 268 | private static native Class forName0(String name, boolean initialize, |
| 269 | ClassLoader loader) |
| 270 | throws ClassNotFoundException; |
| 271 | |
| 272 | /** |
| 273 | * Creates a new instance of the class represented by this {@code Class} |
| 274 | * object. The class is instantiated as if by a {@code new} |
| 275 | * expression with an empty argument list. The class is initialized if it |
| 276 | * has not already been initialized. |
| 277 | * |
| 278 | * <p>Note that this method propagates any exception thrown by the |
| 279 | * nullary constructor, including a checked exception. Use of |
| 280 | * this method effectively bypasses the compile-time exception |
| 281 | * checking that would otherwise be performed by the compiler. |
| 282 | * The {@link |
| 283 | * java.lang.reflect.Constructor#newInstance(java.lang.Object...) |
| 284 | * Constructor.newInstance} method avoids this problem by wrapping |
| 285 | * any exception thrown by the constructor in a (checked) {@link |
| 286 | * java.lang.reflect.InvocationTargetException}. |
| 287 | * |
| 288 | * @return a newly allocated instance of the class represented by this |
| 289 | * object. |
| 290 | * @exception IllegalAccessException if the class or its nullary |
| 291 | * constructor is not accessible. |
| 292 | * @exception InstantiationException |
| 293 | * if this {@code Class} represents an abstract class, |
| 294 | * an interface, an array class, a primitive type, or void; |
| 295 | * or if the class has no nullary constructor; |
| 296 | * or if the instantiation fails for some other reason. |
| 297 | * @exception ExceptionInInitializerError if the initialization |
| 298 | * provoked by this method fails. |
| 299 | * @exception SecurityException |
| 300 | * If a security manager, <i>s</i>, is present and any of the |
| 301 | * following conditions is met: |
| 302 | * |
| 303 | * <ul> |
| 304 | * |
| 305 | * <li> invocation of |
| 306 | * {@link SecurityManager#checkMemberAccess |
| 307 | * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| 308 | * creation of new instances of this class |
| 309 | * |
| 310 | * <li> the caller's class loader is not the same as or an |
| 311 | * ancestor of the class loader for the current class and |
| 312 | * invocation of {@link SecurityManager#checkPackageAccess |
| 313 | * s.checkPackageAccess()} denies access to the package |
| 314 | * of this class |
| 315 | * |
| 316 | * </ul> |
| 317 | * |
| 318 | */ |
| 319 | public T newInstance() |
| 320 | throws InstantiationException, IllegalAccessException |
| 321 | { |
| 322 | if (System.getSecurityManager() != null) { |
| 323 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 324 | } |
| 325 | return newInstance0(); |
| 326 | } |
| 327 | |
| 328 | private T newInstance0() |
| 329 | throws InstantiationException, IllegalAccessException |
| 330 | { |
| 331 | // NOTE: the following code may not be strictly correct under |
| 332 | // the current Java memory model. |
| 333 | |
| 334 | // Constructor lookup |
| 335 | if (cachedConstructor == null) { |
| 336 | if (this == Class.class) { |
| 337 | throw new IllegalAccessException( |
| 338 | "Can not call newInstance() on the Class for java.lang.Class" |
| 339 | ); |
| 340 | } |
| 341 | try { |
| 342 | Class[] empty = {}; |
| 343 | final Constructor<T> c = getConstructor0(empty, Member.DECLARED); |
| 344 | // Disable accessibility checks on the constructor |
| 345 | // since we have to do the security check here anyway |
| 346 | // (the stack depth is wrong for the Constructor's |
| 347 | // security check to work) |
| 348 | java.security.AccessController.doPrivileged |
| 349 | (new java.security.PrivilegedAction() { |
| 350 | public Object run() { |
| 351 | c.setAccessible(true); |
| 352 | return null; |
| 353 | } |
| 354 | }); |
| 355 | cachedConstructor = c; |
| 356 | } catch (NoSuchMethodException e) { |
| 357 | throw new InstantiationException(getName()); |
| 358 | } |
| 359 | } |
| 360 | Constructor<T> tmpConstructor = cachedConstructor; |
| 361 | // Security check (same as in java.lang.reflect.Constructor) |
| 362 | int modifiers = tmpConstructor.getModifiers(); |
| 363 | if (!Reflection.quickCheckMemberAccess(this, modifiers)) { |
| 364 | Class caller = Reflection.getCallerClass(3); |
| 365 | if (newInstanceCallerCache != caller) { |
| 366 | Reflection.ensureMemberAccess(caller, this, null, modifiers); |
| 367 | newInstanceCallerCache = caller; |
| 368 | } |
| 369 | } |
| 370 | // Run constructor |
| 371 | try { |
| 372 | return tmpConstructor.newInstance((Object[])null); |
| 373 | } catch (InvocationTargetException e) { |
| 374 | Unsafe.getUnsafe().throwException(e.getTargetException()); |
| 375 | // Not reached |
| 376 | return null; |
| 377 | } |
| 378 | } |
| 379 | private volatile transient Constructor<T> cachedConstructor; |
| 380 | private volatile transient Class newInstanceCallerCache; |
| 381 | |
| 382 | |
| 383 | /** |
| 384 | * Determines if the specified {@code Object} is assignment-compatible |
| 385 | * with the object represented by this {@code Class}. This method is |
| 386 | * the dynamic equivalent of the Java language {@code instanceof} |
| 387 | * operator. The method returns {@code true} if the specified |
| 388 | * {@code Object} argument is non-null and can be cast to the |
| 389 | * reference type represented by this {@code Class} object without |
| 390 | * raising a {@code ClassCastException.} It returns {@code false} |
| 391 | * otherwise. |
| 392 | * |
| 393 | * <p> Specifically, if this {@code Class} object represents a |
| 394 | * declared class, this method returns {@code true} if the specified |
| 395 | * {@code Object} argument is an instance of the represented class (or |
| 396 | * of any of its subclasses); it returns {@code false} otherwise. If |
| 397 | * this {@code Class} object represents an array class, this method |
| 398 | * returns {@code true} if the specified {@code Object} argument |
| 399 | * can be converted to an object of the array class by an identity |
| 400 | * conversion or by a widening reference conversion; it returns |
| 401 | * {@code false} otherwise. If this {@code Class} object |
| 402 | * represents an interface, this method returns {@code true} if the |
| 403 | * class or any superclass of the specified {@code Object} argument |
| 404 | * implements this interface; it returns {@code false} otherwise. If |
| 405 | * this {@code Class} object represents a primitive type, this method |
| 406 | * returns {@code false}. |
| 407 | * |
| 408 | * @param obj the object to check |
| 409 | * @return true if {@code obj} is an instance of this class |
| 410 | * |
| 411 | * @since JDK1.1 |
| 412 | */ |
| 413 | public native boolean isInstance(Object obj); |
| 414 | |
| 415 | |
| 416 | /** |
| 417 | * Determines if the class or interface represented by this |
| 418 | * {@code Class} object is either the same as, or is a superclass or |
| 419 | * superinterface of, the class or interface represented by the specified |
| 420 | * {@code Class} parameter. It returns {@code true} if so; |
| 421 | * otherwise it returns {@code false}. If this {@code Class} |
| 422 | * object represents a primitive type, this method returns |
| 423 | * {@code true} if the specified {@code Class} parameter is |
| 424 | * exactly this {@code Class} object; otherwise it returns |
| 425 | * {@code false}. |
| 426 | * |
| 427 | * <p> Specifically, this method tests whether the type represented by the |
| 428 | * specified {@code Class} parameter can be converted to the type |
| 429 | * represented by this {@code Class} object via an identity conversion |
| 430 | * or via a widening reference conversion. See <em>The Java Language |
| 431 | * Specification</em>, sections 5.1.1 and 5.1.4 , for details. |
| 432 | * |
| 433 | * @param cls the {@code Class} object to be checked |
| 434 | * @return the {@code boolean} value indicating whether objects of the |
| 435 | * type {@code cls} can be assigned to objects of this class |
| 436 | * @exception NullPointerException if the specified Class parameter is |
| 437 | * null. |
| 438 | * @since JDK1.1 |
| 439 | */ |
| 440 | public native boolean isAssignableFrom(Class<?> cls); |
| 441 | |
| 442 | |
| 443 | /** |
| 444 | * Determines if the specified {@code Class} object represents an |
| 445 | * interface type. |
| 446 | * |
| 447 | * @return {@code true} if this object represents an interface; |
| 448 | * {@code false} otherwise. |
| 449 | */ |
| 450 | public native boolean isInterface(); |
| 451 | |
| 452 | |
| 453 | /** |
| 454 | * Determines if this {@code Class} object represents an array class. |
| 455 | * |
| 456 | * @return {@code true} if this object represents an array class; |
| 457 | * {@code false} otherwise. |
| 458 | * @since JDK1.1 |
| 459 | */ |
| 460 | public native boolean isArray(); |
| 461 | |
| 462 | |
| 463 | /** |
| 464 | * Determines if the specified {@code Class} object represents a |
| 465 | * primitive type. |
| 466 | * |
| 467 | * <p> There are nine predefined {@code Class} objects to represent |
| 468 | * the eight primitive types and void. These are created by the Java |
| 469 | * Virtual Machine, and have the same names as the primitive types that |
| 470 | * they represent, namely {@code boolean}, {@code byte}, |
| 471 | * {@code char}, {@code short}, {@code int}, |
| 472 | * {@code long}, {@code float}, and {@code double}. |
| 473 | * |
| 474 | * <p> These objects may only be accessed via the following public static |
| 475 | * final variables, and are the only {@code Class} objects for which |
| 476 | * this method returns {@code true}. |
| 477 | * |
| 478 | * @return true if and only if this class represents a primitive type |
| 479 | * |
| 480 | * @see java.lang.Boolean#TYPE |
| 481 | * @see java.lang.Character#TYPE |
| 482 | * @see java.lang.Byte#TYPE |
| 483 | * @see java.lang.Short#TYPE |
| 484 | * @see java.lang.Integer#TYPE |
| 485 | * @see java.lang.Long#TYPE |
| 486 | * @see java.lang.Float#TYPE |
| 487 | * @see java.lang.Double#TYPE |
| 488 | * @see java.lang.Void#TYPE |
| 489 | * @since JDK1.1 |
| 490 | */ |
| 491 | public native boolean isPrimitive(); |
| 492 | |
| 493 | /** |
| 494 | * Returns true if this {@code Class} object represents an annotation |
| 495 | * type. Note that if this method returns true, {@link #isInterface()} |
| 496 | * would also return true, as all annotation types are also interfaces. |
| 497 | * |
| 498 | * @return {@code true} if this class object represents an annotation |
| 499 | * type; {@code false} otherwise |
| 500 | * @since 1.5 |
| 501 | */ |
| 502 | public boolean isAnnotation() { |
| 503 | return (getModifiers() & ANNOTATION) != 0; |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * Returns {@code true} if this class is a synthetic class; |
| 508 | * returns {@code false} otherwise. |
| 509 | * @return {@code true} if and only if this class is a synthetic class as |
| 510 | * defined by the Java Language Specification. |
| 511 | * @since 1.5 |
| 512 | */ |
| 513 | public boolean isSynthetic() { |
| 514 | return (getModifiers() & SYNTHETIC) != 0; |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * Returns the name of the entity (class, interface, array class, |
| 519 | * primitive type, or void) represented by this {@code Class} object, |
| 520 | * as a {@code String}. |
| 521 | * |
| 522 | * <p> If this class object represents a reference type that is not an |
| 523 | * array type then the binary name of the class is returned, as specified |
| 524 | * by the Java Language Specification, Second Edition. |
| 525 | * |
| 526 | * <p> If this class object represents a primitive type or void, then the |
| 527 | * name returned is a {@code String} equal to the Java language |
| 528 | * keyword corresponding to the primitive type or void. |
| 529 | * |
| 530 | * <p> If this class object represents a class of arrays, then the internal |
| 531 | * form of the name consists of the name of the element type preceded by |
| 532 | * one or more '{@code [}' characters representing the depth of the array |
| 533 | * nesting. The encoding of element type names is as follows: |
| 534 | * |
| 535 | * <blockquote><table summary="Element types and encodings"> |
| 536 | * <tr><th> Element Type <th> <th> Encoding |
| 537 | * <tr><td> boolean <td> <td align=center> Z |
| 538 | * <tr><td> byte <td> <td align=center> B |
| 539 | * <tr><td> char <td> <td align=center> C |
| 540 | * <tr><td> class or interface |
| 541 | * <td> <td align=center> L<i>classname</i>; |
| 542 | * <tr><td> double <td> <td align=center> D |
| 543 | * <tr><td> float <td> <td align=center> F |
| 544 | * <tr><td> int <td> <td align=center> I |
| 545 | * <tr><td> long <td> <td align=center> J |
| 546 | * <tr><td> short <td> <td align=center> S |
| 547 | * </table></blockquote> |
| 548 | * |
| 549 | * <p> The class or interface name <i>classname</i> is the binary name of |
| 550 | * the class specified above. |
| 551 | * |
| 552 | * <p> Examples: |
| 553 | * <blockquote><pre> |
| 554 | * String.class.getName() |
| 555 | * returns "java.lang.String" |
| 556 | * byte.class.getName() |
| 557 | * returns "byte" |
| 558 | * (new Object[3]).getClass().getName() |
| 559 | * returns "[Ljava.lang.Object;" |
| 560 | * (new int[3][4][5][6][7][8][9]).getClass().getName() |
| 561 | * returns "[[[[[[[I" |
| 562 | * </pre></blockquote> |
| 563 | * |
| 564 | * @return the name of the class or interface |
| 565 | * represented by this object. |
| 566 | */ |
| 567 | public String getName() { |
| 568 | if (name == null) |
| 569 | name = getName0(); |
| 570 | return name; |
| 571 | } |
| 572 | |
| 573 | // cache the name to reduce the number of calls into the VM |
| 574 | private transient String name; |
| 575 | private native String getName0(); |
| 576 | |
| 577 | /** |
| 578 | * Returns the class loader for the class. Some implementations may use |
| 579 | * null to represent the bootstrap class loader. This method will return |
| 580 | * null in such implementations if this class was loaded by the bootstrap |
| 581 | * class loader. |
| 582 | * |
| 583 | * <p> If a security manager is present, and the caller's class loader is |
| 584 | * not null and the caller's class loader is not the same as or an ancestor of |
| 585 | * the class loader for the class whose class loader is requested, then |
| 586 | * this method calls the security manager's {@code checkPermission} |
| 587 | * method with a {@code RuntimePermission("getClassLoader")} |
| 588 | * permission to ensure it's ok to access the class loader for the class. |
| 589 | * |
| 590 | * <p>If this object |
| 591 | * represents a primitive type or void, null is returned. |
| 592 | * |
| 593 | * @return the class loader that loaded the class or interface |
| 594 | * represented by this object. |
| 595 | * @throws SecurityException |
| 596 | * if a security manager exists and its |
| 597 | * {@code checkPermission} method denies |
| 598 | * access to the class loader for the class. |
| 599 | * @see java.lang.ClassLoader |
| 600 | * @see SecurityManager#checkPermission |
| 601 | * @see java.lang.RuntimePermission |
| 602 | */ |
| 603 | public ClassLoader getClassLoader() { |
| 604 | ClassLoader cl = getClassLoader0(); |
| 605 | if (cl == null) |
| 606 | return null; |
| 607 | SecurityManager sm = System.getSecurityManager(); |
| 608 | if (sm != null) { |
| 609 | ClassLoader ccl = ClassLoader.getCallerClassLoader(); |
| 610 | if (ccl != null && ccl != cl && !cl.isAncestor(ccl)) { |
| 611 | sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| 612 | } |
| 613 | } |
| 614 | return cl; |
| 615 | } |
| 616 | |
| 617 | // Package-private to allow ClassLoader access |
| 618 | native ClassLoader getClassLoader0(); |
| 619 | |
| 620 | |
| 621 | /** |
| 622 | * Returns an array of {@code TypeVariable} objects that represent the |
| 623 | * type variables declared by the generic declaration represented by this |
| 624 | * {@code GenericDeclaration} object, in declaration order. Returns an |
| 625 | * array of length 0 if the underlying generic declaration declares no type |
| 626 | * variables. |
| 627 | * |
| 628 | * @return an array of {@code TypeVariable} objects that represent |
| 629 | * the type variables declared by this generic declaration |
| 630 | * @throws GenericSignatureFormatError if the generic |
| 631 | * signature of this generic declaration does not conform to |
| 632 | * the format specified in the Java Virtual Machine Specification, |
| 633 | * 3rd edition |
| 634 | * @since 1.5 |
| 635 | */ |
| 636 | public TypeVariable<Class<T>>[] getTypeParameters() { |
| 637 | if (getGenericSignature() != null) |
| 638 | return (TypeVariable<Class<T>>[])getGenericInfo().getTypeParameters(); |
| 639 | else |
| 640 | return (TypeVariable<Class<T>>[])new TypeVariable[0]; |
| 641 | } |
| 642 | |
| 643 | |
| 644 | /** |
| 645 | * Returns the {@code Class} representing the superclass of the entity |
| 646 | * (class, interface, primitive type or void) represented by this |
| 647 | * {@code Class}. If this {@code Class} represents either the |
| 648 | * {@code Object} class, an interface, a primitive type, or void, then |
| 649 | * null is returned. If this object represents an array class then the |
| 650 | * {@code Class} object representing the {@code Object} class is |
| 651 | * returned. |
| 652 | * |
| 653 | * @return the superclass of the class represented by this object. |
| 654 | */ |
| 655 | public native Class<? super T> getSuperclass(); |
| 656 | |
| 657 | |
| 658 | /** |
| 659 | * Returns the {@code Type} representing the direct superclass of |
| 660 | * the entity (class, interface, primitive type or void) represented by |
| 661 | * this {@code Class}. |
| 662 | * |
| 663 | * <p>If the superclass is a parameterized type, the {@code Type} |
| 664 | * object returned must accurately reflect the actual type |
| 665 | * parameters used in the source code. The parameterized type |
| 666 | * representing the superclass is created if it had not been |
| 667 | * created before. See the declaration of {@link |
| 668 | * java.lang.reflect.ParameterizedType ParameterizedType} for the |
| 669 | * semantics of the creation process for parameterized types. If |
| 670 | * this {@code Class} represents either the {@code Object} |
| 671 | * class, an interface, a primitive type, or void, then null is |
| 672 | * returned. If this object represents an array class then the |
| 673 | * {@code Class} object representing the {@code Object} class is |
| 674 | * returned. |
| 675 | * |
| 676 | * @throws GenericSignatureFormatError if the generic |
| 677 | * class signature does not conform to the format specified in the |
| 678 | * Java Virtual Machine Specification, 3rd edition |
| 679 | * @throws TypeNotPresentException if the generic superclass |
| 680 | * refers to a non-existent type declaration |
| 681 | * @throws MalformedParameterizedTypeException if the |
| 682 | * generic superclass refers to a parameterized type that cannot be |
| 683 | * instantiated for any reason |
| 684 | * @return the superclass of the class represented by this object |
| 685 | * @since 1.5 |
| 686 | */ |
| 687 | public Type getGenericSuperclass() { |
| 688 | if (getGenericSignature() != null) { |
| 689 | // Historical irregularity: |
| 690 | // Generic signature marks interfaces with superclass = Object |
| 691 | // but this API returns null for interfaces |
| 692 | if (isInterface()) |
| 693 | return null; |
| 694 | return getGenericInfo().getSuperclass(); |
| 695 | } else |
| 696 | return getSuperclass(); |
| 697 | } |
| 698 | |
| 699 | /** |
| 700 | * Gets the package for this class. The class loader of this class is used |
| 701 | * to find the package. If the class was loaded by the bootstrap class |
| 702 | * loader the set of packages loaded from CLASSPATH is searched to find the |
| 703 | * package of the class. Null is returned if no package object was created |
| 704 | * by the class loader of this class. |
| 705 | * |
| 706 | * <p> Packages have attributes for versions and specifications only if the |
| 707 | * information was defined in the manifests that accompany the classes, and |
| 708 | * if the class loader created the package instance with the attributes |
| 709 | * from the manifest. |
| 710 | * |
| 711 | * @return the package of the class, or null if no package |
| 712 | * information is available from the archive or codebase. |
| 713 | */ |
| 714 | public Package getPackage() { |
| 715 | return Package.getPackage(this); |
| 716 | } |
| 717 | |
| 718 | |
| 719 | /** |
| 720 | * Determines the interfaces implemented by the class or interface |
| 721 | * represented by this object. |
| 722 | * |
| 723 | * <p> If this object represents a class, the return value is an array |
| 724 | * containing objects representing all interfaces implemented by the |
| 725 | * class. The order of the interface objects in the array corresponds to |
| 726 | * the order of the interface names in the {@code implements} clause |
| 727 | * of the declaration of the class represented by this object. For |
| 728 | * example, given the declaration: |
| 729 | * <blockquote> |
| 730 | * {@code class Shimmer implements FloorWax, DessertTopping { ... }} |
| 731 | * </blockquote> |
| 732 | * suppose the value of {@code s} is an instance of |
| 733 | * {@code Shimmer}; the value of the expression: |
| 734 | * <blockquote> |
| 735 | * {@code s.getClass().getInterfaces()[0]} |
| 736 | * </blockquote> |
| 737 | * is the {@code Class} object that represents interface |
| 738 | * {@code FloorWax}; and the value of: |
| 739 | * <blockquote> |
| 740 | * {@code s.getClass().getInterfaces()[1]} |
| 741 | * </blockquote> |
| 742 | * is the {@code Class} object that represents interface |
| 743 | * {@code DessertTopping}. |
| 744 | * |
| 745 | * <p> If this object represents an interface, the array contains objects |
| 746 | * representing all interfaces extended by the interface. The order of the |
| 747 | * interface objects in the array corresponds to the order of the interface |
| 748 | * names in the {@code extends} clause of the declaration of the |
| 749 | * interface represented by this object. |
| 750 | * |
| 751 | * <p> If this object represents a class or interface that implements no |
| 752 | * interfaces, the method returns an array of length 0. |
| 753 | * |
| 754 | * <p> If this object represents a primitive type or void, the method |
| 755 | * returns an array of length 0. |
| 756 | * |
| 757 | * @return an array of interfaces implemented by this class. |
| 758 | */ |
| 759 | public native Class<?>[] getInterfaces(); |
| 760 | |
| 761 | /** |
| 762 | * Returns the {@code Type}s representing the interfaces |
| 763 | * directly implemented by the class or interface represented by |
| 764 | * this object. |
| 765 | * |
| 766 | * <p>If a superinterface is a parameterized type, the |
| 767 | * {@code Type} object returned for it must accurately reflect |
| 768 | * the actual type parameters used in the source code. The |
| 769 | * parameterized type representing each superinterface is created |
| 770 | * if it had not been created before. See the declaration of |
| 771 | * {@link java.lang.reflect.ParameterizedType ParameterizedType} |
| 772 | * for the semantics of the creation process for parameterized |
| 773 | * types. |
| 774 | * |
| 775 | * <p> If this object represents a class, the return value is an |
| 776 | * array containing objects representing all interfaces |
| 777 | * implemented by the class. The order of the interface objects in |
| 778 | * the array corresponds to the order of the interface names in |
| 779 | * the {@code implements} clause of the declaration of the class |
| 780 | * represented by this object. In the case of an array class, the |
| 781 | * interfaces {@code Cloneable} and {@code Serializable} are |
| 782 | * returned in that order. |
| 783 | * |
| 784 | * <p>If this object represents an interface, the array contains |
| 785 | * objects representing all interfaces directly extended by the |
| 786 | * interface. The order of the interface objects in the array |
| 787 | * corresponds to the order of the interface names in the |
| 788 | * {@code extends} clause of the declaration of the interface |
| 789 | * represented by this object. |
| 790 | * |
| 791 | * <p>If this object represents a class or interface that |
| 792 | * implements no interfaces, the method returns an array of length |
| 793 | * 0. |
| 794 | * |
| 795 | * <p>If this object represents a primitive type or void, the |
| 796 | * method returns an array of length 0. |
| 797 | * |
| 798 | * @throws GenericSignatureFormatError |
| 799 | * if the generic class signature does not conform to the format |
| 800 | * specified in the Java Virtual Machine Specification, 3rd edition |
| 801 | * @throws TypeNotPresentException if any of the generic |
| 802 | * superinterfaces refers to a non-existent type declaration |
| 803 | * @throws MalformedParameterizedTypeException if any of the |
| 804 | * generic superinterfaces refer to a parameterized type that cannot |
| 805 | * be instantiated for any reason |
| 806 | * @return an array of interfaces implemented by this class |
| 807 | * @since 1.5 |
| 808 | */ |
| 809 | public Type[] getGenericInterfaces() { |
| 810 | if (getGenericSignature() != null) |
| 811 | return getGenericInfo().getSuperInterfaces(); |
| 812 | else |
| 813 | return getInterfaces(); |
| 814 | } |
| 815 | |
| 816 | |
| 817 | /** |
| 818 | * Returns the {@code Class} representing the component type of an |
| 819 | * array. If this class does not represent an array class this method |
| 820 | * returns null. |
| 821 | * |
| 822 | * @return the {@code Class} representing the component type of this |
| 823 | * class if this class is an array |
| 824 | * @see java.lang.reflect.Array |
| 825 | * @since JDK1.1 |
| 826 | */ |
| 827 | public native Class<?> getComponentType(); |
| 828 | |
| 829 | |
| 830 | /** |
| 831 | * Returns the Java language modifiers for this class or interface, encoded |
| 832 | * in an integer. The modifiers consist of the Java Virtual Machine's |
| 833 | * constants for {@code public}, {@code protected}, |
| 834 | * {@code private}, {@code final}, {@code static}, |
| 835 | * {@code abstract} and {@code interface}; they should be decoded |
| 836 | * using the methods of class {@code Modifier}. |
| 837 | * |
| 838 | * <p> If the underlying class is an array class, then its |
| 839 | * {@code public}, {@code private} and {@code protected} |
| 840 | * modifiers are the same as those of its component type. If this |
| 841 | * {@code Class} represents a primitive type or void, its |
| 842 | * {@code public} modifier is always {@code true}, and its |
| 843 | * {@code protected} and {@code private} modifiers are always |
| 844 | * {@code false}. If this object represents an array class, a |
| 845 | * primitive type or void, then its {@code final} modifier is always |
| 846 | * {@code true} and its interface modifier is always |
| 847 | * {@code false}. The values of its other modifiers are not determined |
| 848 | * by this specification. |
| 849 | * |
| 850 | * <p> The modifier encodings are defined in <em>The Java Virtual Machine |
| 851 | * Specification</em>, table 4.1. |
| 852 | * |
| 853 | * @return the {@code int} representing the modifiers for this class |
| 854 | * @see java.lang.reflect.Modifier |
| 855 | * @since JDK1.1 |
| 856 | */ |
| 857 | public native int getModifiers(); |
| 858 | |
| 859 | |
| 860 | /** |
| 861 | * Gets the signers of this class. |
| 862 | * |
| 863 | * @return the signers of this class, or null if there are no signers. In |
| 864 | * particular, this method returns null if this object represents |
| 865 | * a primitive type or void. |
| 866 | * @since JDK1.1 |
| 867 | */ |
| 868 | public native Object[] getSigners(); |
| 869 | |
| 870 | |
| 871 | /** |
| 872 | * Set the signers of this class. |
| 873 | */ |
| 874 | native void setSigners(Object[] signers); |
| 875 | |
| 876 | |
| 877 | /** |
| 878 | * If this {@code Class} object represents a local or anonymous |
| 879 | * class within a method, returns a {@link |
| 880 | * java.lang.reflect.Method Method} object representing the |
| 881 | * immediately enclosing method of the underlying class. Returns |
| 882 | * {@code null} otherwise. |
| 883 | * |
| 884 | * In particular, this method returns {@code null} if the underlying |
| 885 | * class is a local or anonymous class immediately enclosed by a type |
| 886 | * declaration, instance initializer or static initializer. |
| 887 | * |
| 888 | * @return the immediately enclosing method of the underlying class, if |
| 889 | * that class is a local or anonymous class; otherwise {@code null}. |
| 890 | * @since 1.5 |
| 891 | */ |
| 892 | public Method getEnclosingMethod() { |
| 893 | EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| 894 | |
| 895 | if (enclosingInfo == null) |
| 896 | return null; |
| 897 | else { |
| 898 | if (!enclosingInfo.isMethod()) |
| 899 | return null; |
| 900 | |
| 901 | MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(), |
| 902 | getFactory()); |
| 903 | Class returnType = toClass(typeInfo.getReturnType()); |
| 904 | Type [] parameterTypes = typeInfo.getParameterTypes(); |
| 905 | Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; |
| 906 | |
| 907 | // Convert Types to Classes; returned types *should* |
| 908 | // be class objects since the methodDescriptor's used |
| 909 | // don't have generics information |
| 910 | for(int i = 0; i < parameterClasses.length; i++) |
| 911 | parameterClasses[i] = toClass(parameterTypes[i]); |
| 912 | |
| 913 | /* |
| 914 | * Loop over all declared methods; match method name, |
| 915 | * number of and type of parameters, *and* return |
| 916 | * type. Matching return type is also necessary |
| 917 | * because of covariant returns, etc. |
| 918 | */ |
| 919 | for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) { |
| 920 | if (m.getName().equals(enclosingInfo.getName()) ) { |
| 921 | Class<?>[] candidateParamClasses = m.getParameterTypes(); |
| 922 | if (candidateParamClasses.length == parameterClasses.length) { |
| 923 | boolean matches = true; |
| 924 | for(int i = 0; i < candidateParamClasses.length; i++) { |
| 925 | if (!candidateParamClasses[i].equals(parameterClasses[i])) { |
| 926 | matches = false; |
| 927 | break; |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | if (matches) { // finally, check return type |
| 932 | if (m.getReturnType().equals(returnType) ) |
| 933 | return m; |
| 934 | } |
| 935 | } |
| 936 | } |
| 937 | } |
| 938 | |
| 939 | throw new InternalError("Enclosing method not found"); |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | private native Object[] getEnclosingMethod0(); |
| 944 | |
| 945 | private EnclosingMethodInfo getEnclosingMethodInfo() { |
| 946 | Object[] enclosingInfo = getEnclosingMethod0(); |
| 947 | if (enclosingInfo == null) |
| 948 | return null; |
| 949 | else { |
| 950 | return new EnclosingMethodInfo(enclosingInfo); |
| 951 | } |
| 952 | } |
| 953 | |
| 954 | private final static class EnclosingMethodInfo { |
| 955 | private Class<?> enclosingClass; |
| 956 | private String name; |
| 957 | private String descriptor; |
| 958 | |
| 959 | private EnclosingMethodInfo(Object[] enclosingInfo) { |
| 960 | if (enclosingInfo.length != 3) |
| 961 | throw new InternalError("Malformed enclosing method information"); |
| 962 | try { |
| 963 | // The array is expected to have three elements: |
| 964 | |
| 965 | // the immediately enclosing class |
| 966 | enclosingClass = (Class<?>) enclosingInfo[0]; |
| 967 | assert(enclosingClass != null); |
| 968 | |
| 969 | // the immediately enclosing method or constructor's |
| 970 | // name (can be null). |
| 971 | name = (String) enclosingInfo[1]; |
| 972 | |
| 973 | // the immediately enclosing method or constructor's |
| 974 | // descriptor (null iff name is). |
| 975 | descriptor = (String) enclosingInfo[2]; |
| 976 | assert((name != null && descriptor != null) || name == descriptor); |
| 977 | } catch (ClassCastException cce) { |
| 978 | throw new InternalError("Invalid type in enclosing method information"); |
| 979 | } |
| 980 | } |
| 981 | |
| 982 | boolean isPartial() { |
| 983 | return enclosingClass == null || name == null || descriptor == null; |
| 984 | } |
| 985 | |
| 986 | boolean isConstructor() { return !isPartial() && "<init>".equals(name); } |
| 987 | |
| 988 | boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); } |
| 989 | |
| 990 | Class<?> getEnclosingClass() { return enclosingClass; } |
| 991 | |
| 992 | String getName() { return name; } |
| 993 | |
| 994 | String getDescriptor() { return descriptor; } |
| 995 | |
| 996 | } |
| 997 | |
| 998 | private static Class toClass(Type o) { |
| 999 | if (o instanceof GenericArrayType) |
| 1000 | return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()), |
| 1001 | 0) |
| 1002 | .getClass(); |
| 1003 | return (Class)o; |
| 1004 | } |
| 1005 | |
| 1006 | /** |
| 1007 | * If this {@code Class} object represents a local or anonymous |
| 1008 | * class within a constructor, returns a {@link |
| 1009 | * java.lang.reflect.Constructor Constructor} object representing |
| 1010 | * the immediately enclosing constructor of the underlying |
| 1011 | * class. Returns {@code null} otherwise. In particular, this |
| 1012 | * method returns {@code null} if the underlying class is a local |
| 1013 | * or anonymous class immediately enclosed by a type declaration, |
| 1014 | * instance initializer or static initializer. |
| 1015 | * |
| 1016 | * @return the immediately enclosing constructor of the underlying class, if |
| 1017 | * that class is a local or anonymous class; otherwise {@code null}. |
| 1018 | * @since 1.5 |
| 1019 | */ |
| 1020 | public Constructor<?> getEnclosingConstructor() { |
| 1021 | EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| 1022 | |
| 1023 | if (enclosingInfo == null) |
| 1024 | return null; |
| 1025 | else { |
| 1026 | if (!enclosingInfo.isConstructor()) |
| 1027 | return null; |
| 1028 | |
| 1029 | ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(), |
| 1030 | getFactory()); |
| 1031 | Type [] parameterTypes = typeInfo.getParameterTypes(); |
| 1032 | Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; |
| 1033 | |
| 1034 | // Convert Types to Classes; returned types *should* |
| 1035 | // be class objects since the methodDescriptor's used |
| 1036 | // don't have generics information |
| 1037 | for(int i = 0; i < parameterClasses.length; i++) |
| 1038 | parameterClasses[i] = toClass(parameterTypes[i]); |
| 1039 | |
| 1040 | /* |
| 1041 | * Loop over all declared constructors; match number |
| 1042 | * of and type of parameters. |
| 1043 | */ |
| 1044 | for(Constructor c: enclosingInfo.getEnclosingClass().getDeclaredConstructors()) { |
| 1045 | Class<?>[] candidateParamClasses = c.getParameterTypes(); |
| 1046 | if (candidateParamClasses.length == parameterClasses.length) { |
| 1047 | boolean matches = true; |
| 1048 | for(int i = 0; i < candidateParamClasses.length; i++) { |
| 1049 | if (!candidateParamClasses[i].equals(parameterClasses[i])) { |
| 1050 | matches = false; |
| 1051 | break; |
| 1052 | } |
| 1053 | } |
| 1054 | |
| 1055 | if (matches) |
| 1056 | return c; |
| 1057 | } |
| 1058 | } |
| 1059 | |
| 1060 | throw new InternalError("Enclosing constructor not found"); |
| 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | |
| 1065 | /** |
| 1066 | * If the class or interface represented by this {@code Class} object |
| 1067 | * is a member of another class, returns the {@code Class} object |
| 1068 | * representing the class in which it was declared. This method returns |
| 1069 | * null if this class or interface is not a member of any other class. If |
| 1070 | * this {@code Class} object represents an array class, a primitive |
| 1071 | * type, or void,then this method returns null. |
| 1072 | * |
| 1073 | * @return the declaring class for this class |
| 1074 | * @since JDK1.1 |
| 1075 | */ |
| 1076 | public native Class<?> getDeclaringClass(); |
| 1077 | |
| 1078 | |
| 1079 | /** |
| 1080 | * Returns the immediately enclosing class of the underlying |
| 1081 | * class. If the underlying class is a top level class this |
| 1082 | * method returns {@code null}. |
| 1083 | * @return the immediately enclosing class of the underlying class |
| 1084 | * @since 1.5 |
| 1085 | */ |
| 1086 | public Class<?> getEnclosingClass() { |
| 1087 | // There are five kinds of classes (or interfaces): |
| 1088 | // a) Top level classes |
| 1089 | // b) Nested classes (static member classes) |
| 1090 | // c) Inner classes (non-static member classes) |
| 1091 | // d) Local classes (named classes declared within a method) |
| 1092 | // e) Anonymous classes |
| 1093 | |
| 1094 | |
| 1095 | // JVM Spec 4.8.6: A class must have an EnclosingMethod |
| 1096 | // attribute if and only if it is a local class or an |
| 1097 | // anonymous class. |
| 1098 | EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| 1099 | |
| 1100 | if (enclosingInfo == null) { |
| 1101 | // This is a top level or a nested class or an inner class (a, b, or c) |
| 1102 | return getDeclaringClass(); |
| 1103 | } else { |
| 1104 | Class<?> enclosingClass = enclosingInfo.getEnclosingClass(); |
| 1105 | // This is a local class or an anonymous class (d or e) |
| 1106 | if (enclosingClass == this || enclosingClass == null) |
| 1107 | throw new InternalError("Malformed enclosing method information"); |
| 1108 | else |
| 1109 | return enclosingClass; |
| 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | /** |
| 1114 | * Returns the simple name of the underlying class as given in the |
| 1115 | * source code. Returns an empty string if the underlying class is |
| 1116 | * anonymous. |
| 1117 | * |
| 1118 | * <p>The simple name of an array is the simple name of the |
| 1119 | * component type with "[]" appended. In particular the simple |
| 1120 | * name of an array whose component type is anonymous is "[]". |
| 1121 | * |
| 1122 | * @return the simple name of the underlying class |
| 1123 | * @since 1.5 |
| 1124 | */ |
| 1125 | public String getSimpleName() { |
| 1126 | if (isArray()) |
| 1127 | return getComponentType().getSimpleName()+"[]"; |
| 1128 | |
| 1129 | String simpleName = getSimpleBinaryName(); |
| 1130 | if (simpleName == null) { // top level class |
| 1131 | simpleName = getName(); |
| 1132 | return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name |
| 1133 | } |
| 1134 | // According to JLS3 "Binary Compatibility" (13.1) the binary |
| 1135 | // name of non-package classes (not top level) is the binary |
| 1136 | // name of the immediately enclosing class followed by a '$' followed by: |
| 1137 | // (for nested and inner classes): the simple name. |
| 1138 | // (for local classes): 1 or more digits followed by the simple name. |
| 1139 | // (for anonymous classes): 1 or more digits. |
| 1140 | |
| 1141 | // Since getSimpleBinaryName() will strip the binary name of |
| 1142 | // the immediatly enclosing class, we are now looking at a |
| 1143 | // string that matches the regular expression "\$[0-9]*" |
| 1144 | // followed by a simple name (considering the simple of an |
| 1145 | // anonymous class to be the empty string). |
| 1146 | |
| 1147 | // Remove leading "\$[0-9]*" from the name |
| 1148 | int length = simpleName.length(); |
| 1149 | if (length < 1 || simpleName.charAt(0) != '$') |
| 1150 | throw new InternalError("Malformed class name"); |
| 1151 | int index = 1; |
| 1152 | while (index < length && isAsciiDigit(simpleName.charAt(index))) |
| 1153 | index++; |
| 1154 | // Eventually, this is the empty string iff this is an anonymous class |
| 1155 | return simpleName.substring(index); |
| 1156 | } |
| 1157 | |
| 1158 | /** |
| 1159 | * Character.isDigit answers {@code true} to some non-ascii |
| 1160 | * digits. This one does not. |
| 1161 | */ |
| 1162 | private static boolean isAsciiDigit(char c) { |
| 1163 | return '0' <= c && c <= '9'; |
| 1164 | } |
| 1165 | |
| 1166 | /** |
| 1167 | * Returns the canonical name of the underlying class as |
| 1168 | * defined by the Java Language Specification. Returns null if |
| 1169 | * the underlying class does not have a canonical name (i.e., if |
| 1170 | * it is a local or anonymous class or an array whose component |
| 1171 | * type does not have a canonical name). |
| 1172 | * @return the canonical name of the underlying class if it exists, and |
| 1173 | * {@code null} otherwise. |
| 1174 | * @since 1.5 |
| 1175 | */ |
| 1176 | public String getCanonicalName() { |
| 1177 | if (isArray()) { |
| 1178 | String canonicalName = getComponentType().getCanonicalName(); |
| 1179 | if (canonicalName != null) |
| 1180 | return canonicalName + "[]"; |
| 1181 | else |
| 1182 | return null; |
| 1183 | } |
| 1184 | if (isLocalOrAnonymousClass()) |
| 1185 | return null; |
| 1186 | Class<?> enclosingClass = getEnclosingClass(); |
| 1187 | if (enclosingClass == null) { // top level class |
| 1188 | return getName(); |
| 1189 | } else { |
| 1190 | String enclosingName = enclosingClass.getCanonicalName(); |
| 1191 | if (enclosingName == null) |
| 1192 | return null; |
| 1193 | return enclosingName + "." + getSimpleName(); |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | /** |
| 1198 | * Returns {@code true} if and only if the underlying class |
| 1199 | * is an anonymous class. |
| 1200 | * |
| 1201 | * @return {@code true} if and only if this class is an anonymous class. |
| 1202 | * @since 1.5 |
| 1203 | */ |
| 1204 | public boolean isAnonymousClass() { |
| 1205 | return "".equals(getSimpleName()); |
| 1206 | } |
| 1207 | |
| 1208 | /** |
| 1209 | * Returns {@code true} if and only if the underlying class |
| 1210 | * is a local class. |
| 1211 | * |
| 1212 | * @return {@code true} if and only if this class is a local class. |
| 1213 | * @since 1.5 |
| 1214 | */ |
| 1215 | public boolean isLocalClass() { |
| 1216 | return isLocalOrAnonymousClass() && !isAnonymousClass(); |
| 1217 | } |
| 1218 | |
| 1219 | /** |
| 1220 | * Returns {@code true} if and only if the underlying class |
| 1221 | * is a member class. |
| 1222 | * |
| 1223 | * @return {@code true} if and only if this class is a member class. |
| 1224 | * @since 1.5 |
| 1225 | */ |
| 1226 | public boolean isMemberClass() { |
| 1227 | return getSimpleBinaryName() != null && !isLocalOrAnonymousClass(); |
| 1228 | } |
| 1229 | |
| 1230 | /** |
| 1231 | * Returns the "simple binary name" of the underlying class, i.e., |
| 1232 | * the binary name without the leading enclosing class name. |
| 1233 | * Returns {@code null} if the underlying class is a top level |
| 1234 | * class. |
| 1235 | */ |
| 1236 | private String getSimpleBinaryName() { |
| 1237 | Class<?> enclosingClass = getEnclosingClass(); |
| 1238 | if (enclosingClass == null) // top level class |
| 1239 | return null; |
| 1240 | // Otherwise, strip the enclosing class' name |
| 1241 | try { |
| 1242 | return getName().substring(enclosingClass.getName().length()); |
| 1243 | } catch (IndexOutOfBoundsException ex) { |
| 1244 | throw new InternalError("Malformed class name"); |
| 1245 | } |
| 1246 | } |
| 1247 | |
| 1248 | /** |
| 1249 | * Returns {@code true} if this is a local class or an anonymous |
| 1250 | * class. Returns {@code false} otherwise. |
| 1251 | */ |
| 1252 | private boolean isLocalOrAnonymousClass() { |
| 1253 | // JVM Spec 4.8.6: A class must have an EnclosingMethod |
| 1254 | // attribute if and only if it is a local class or an |
| 1255 | // anonymous class. |
| 1256 | return getEnclosingMethodInfo() != null; |
| 1257 | } |
| 1258 | |
| 1259 | /** |
| 1260 | * Returns an array containing {@code Class} objects representing all |
| 1261 | * the public classes and interfaces that are members of the class |
| 1262 | * represented by this {@code Class} object. This includes public |
| 1263 | * class and interface members inherited from superclasses and public class |
| 1264 | * and interface members declared by the class. This method returns an |
| 1265 | * array of length 0 if this {@code Class} object has no public member |
| 1266 | * classes or interfaces. This method also returns an array of length 0 if |
| 1267 | * this {@code Class} object represents a primitive type, an array |
| 1268 | * class, or void. |
| 1269 | * |
| 1270 | * @return the array of {@code Class} objects representing the public |
| 1271 | * members of this class |
| 1272 | * @exception SecurityException |
| 1273 | * If a security manager, <i>s</i>, is present and any of the |
| 1274 | * following conditions is met: |
| 1275 | * |
| 1276 | * <ul> |
| 1277 | * |
| 1278 | * <li> invocation of |
| 1279 | * {@link SecurityManager#checkMemberAccess |
| 1280 | * s.checkMemberAccess(this, Member.PUBLIC)} method |
| 1281 | * denies access to the classes within this class |
| 1282 | * |
| 1283 | * <li> the caller's class loader is not the same as or an |
| 1284 | * ancestor of the class loader for the current class and |
| 1285 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1286 | * s.checkPackageAccess()} denies access to the package |
| 1287 | * of this class |
| 1288 | * |
| 1289 | * </ul> |
| 1290 | * |
| 1291 | * @since JDK1.1 |
| 1292 | */ |
| 1293 | public Class<?>[] getClasses() { |
| 1294 | // be very careful not to change the stack depth of this |
| 1295 | // checkMemberAccess call for security reasons |
| 1296 | // see java.lang.SecurityManager.checkMemberAccess |
| 1297 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 1298 | |
| 1299 | // Privileged so this implementation can look at DECLARED classes, |
| 1300 | // something the caller might not have privilege to do. The code here |
| 1301 | // is allowed to look at DECLARED classes because (1) it does not hand |
| 1302 | // out anything other than public members and (2) public member access |
| 1303 | // has already been ok'd by the SecurityManager. |
| 1304 | |
| 1305 | Class[] result = (Class[]) java.security.AccessController.doPrivileged |
| 1306 | (new java.security.PrivilegedAction() { |
| 1307 | public Object run() { |
| 1308 | java.util.List<Class> list = new java.util.ArrayList(); |
| 1309 | Class currentClass = Class.this; |
| 1310 | while (currentClass != null) { |
| 1311 | Class[] members = currentClass.getDeclaredClasses(); |
| 1312 | for (int i = 0; i < members.length; i++) { |
| 1313 | if (Modifier.isPublic(members[i].getModifiers())) { |
| 1314 | list.add(members[i]); |
| 1315 | } |
| 1316 | } |
| 1317 | currentClass = currentClass.getSuperclass(); |
| 1318 | } |
| 1319 | Class[] empty = {}; |
| 1320 | return list.toArray(empty); |
| 1321 | } |
| 1322 | }); |
| 1323 | |
| 1324 | return result; |
| 1325 | } |
| 1326 | |
| 1327 | |
| 1328 | /** |
| 1329 | * Returns an array containing {@code Field} objects reflecting all |
| 1330 | * the accessible public fields of the class or interface represented by |
| 1331 | * this {@code Class} object. The elements in the array returned are |
| 1332 | * not sorted and are not in any particular order. This method returns an |
| 1333 | * array of length 0 if the class or interface has no accessible public |
| 1334 | * fields, or if it represents an array class, a primitive type, or void. |
| 1335 | * |
| 1336 | * <p> Specifically, if this {@code Class} object represents a class, |
| 1337 | * this method returns the public fields of this class and of all its |
| 1338 | * superclasses. If this {@code Class} object represents an |
| 1339 | * interface, this method returns the fields of this interface and of all |
| 1340 | * its superinterfaces. |
| 1341 | * |
| 1342 | * <p> The implicit length field for array class is not reflected by this |
| 1343 | * method. User code should use the methods of class {@code Array} to |
| 1344 | * manipulate arrays. |
| 1345 | * |
| 1346 | * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. |
| 1347 | * |
| 1348 | * @return the array of {@code Field} objects representing the |
| 1349 | * public fields |
| 1350 | * @exception SecurityException |
| 1351 | * If a security manager, <i>s</i>, is present and any of the |
| 1352 | * following conditions is met: |
| 1353 | * |
| 1354 | * <ul> |
| 1355 | * |
| 1356 | * <li> invocation of |
| 1357 | * {@link SecurityManager#checkMemberAccess |
| 1358 | * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| 1359 | * access to the fields within this class |
| 1360 | * |
| 1361 | * <li> the caller's class loader is not the same as or an |
| 1362 | * ancestor of the class loader for the current class and |
| 1363 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1364 | * s.checkPackageAccess()} denies access to the package |
| 1365 | * of this class |
| 1366 | * |
| 1367 | * </ul> |
| 1368 | * |
| 1369 | * @since JDK1.1 |
| 1370 | */ |
| 1371 | public Field[] getFields() throws SecurityException { |
| 1372 | // be very careful not to change the stack depth of this |
| 1373 | // checkMemberAccess call for security reasons |
| 1374 | // see java.lang.SecurityManager.checkMemberAccess |
| 1375 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 1376 | return copyFields(privateGetPublicFields(null)); |
| 1377 | } |
| 1378 | |
| 1379 | |
| 1380 | /** |
| 1381 | * Returns an array containing {@code Method} objects reflecting all |
| 1382 | * the public <em>member</em> methods of the class or interface represented |
| 1383 | * by this {@code Class} object, including those declared by the class |
| 1384 | * or interface and those inherited from superclasses and |
| 1385 | * superinterfaces. Array classes return all the (public) member methods |
| 1386 | * inherited from the {@code Object} class. The elements in the array |
| 1387 | * returned are not sorted and are not in any particular order. This |
| 1388 | * method returns an array of length 0 if this {@code Class} object |
| 1389 | * represents a class or interface that has no public member methods, or if |
| 1390 | * this {@code Class} object represents a primitive type or void. |
| 1391 | * |
| 1392 | * <p> The class initialization method {@code <clinit>} is not |
| 1393 | * included in the returned array. If the class declares multiple public |
| 1394 | * member methods with the same parameter types, they are all included in |
| 1395 | * the returned array. |
| 1396 | * |
| 1397 | * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4. |
| 1398 | * |
| 1399 | * @return the array of {@code Method} objects representing the |
| 1400 | * public methods of this class |
| 1401 | * @exception SecurityException |
| 1402 | * If a security manager, <i>s</i>, is present and any of the |
| 1403 | * following conditions is met: |
| 1404 | * |
| 1405 | * <ul> |
| 1406 | * |
| 1407 | * <li> invocation of |
| 1408 | * {@link SecurityManager#checkMemberAccess |
| 1409 | * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| 1410 | * access to the methods within this class |
| 1411 | * |
| 1412 | * <li> the caller's class loader is not the same as or an |
| 1413 | * ancestor of the class loader for the current class and |
| 1414 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1415 | * s.checkPackageAccess()} denies access to the package |
| 1416 | * of this class |
| 1417 | * |
| 1418 | * </ul> |
| 1419 | * |
| 1420 | * @since JDK1.1 |
| 1421 | */ |
| 1422 | public Method[] getMethods() throws SecurityException { |
| 1423 | // be very careful not to change the stack depth of this |
| 1424 | // checkMemberAccess call for security reasons |
| 1425 | // see java.lang.SecurityManager.checkMemberAccess |
| 1426 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 1427 | return copyMethods(privateGetPublicMethods()); |
| 1428 | } |
| 1429 | |
| 1430 | |
| 1431 | /** |
| 1432 | * Returns an array containing {@code Constructor} objects reflecting |
| 1433 | * all the public constructors of the class represented by this |
| 1434 | * {@code Class} object. An array of length 0 is returned if the |
| 1435 | * class has no public constructors, or if the class is an array class, or |
| 1436 | * if the class reflects a primitive type or void. |
| 1437 | * |
| 1438 | * Note that while this method returns an array of {@code |
| 1439 | * Constructor<T>} objects (that is an array of constructors from |
| 1440 | * this class), the return type of this method is {@code |
| 1441 | * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as |
| 1442 | * might be expected. This less informative return type is |
| 1443 | * necessary since after being returned from this method, the |
| 1444 | * array could be modified to hold {@code Constructor} objects for |
| 1445 | * different classes, which would violate the type guarantees of |
| 1446 | * {@code Constructor<T>[]}. |
| 1447 | * |
| 1448 | * @return the array of {@code Constructor} objects representing the |
| 1449 | * public constructors of this class |
| 1450 | * @exception SecurityException |
| 1451 | * If a security manager, <i>s</i>, is present and any of the |
| 1452 | * following conditions is met: |
| 1453 | * |
| 1454 | * <ul> |
| 1455 | * |
| 1456 | * <li> invocation of |
| 1457 | * {@link SecurityManager#checkMemberAccess |
| 1458 | * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| 1459 | * access to the constructors within this class |
| 1460 | * |
| 1461 | * <li> the caller's class loader is not the same as or an |
| 1462 | * ancestor of the class loader for the current class and |
| 1463 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1464 | * s.checkPackageAccess()} denies access to the package |
| 1465 | * of this class |
| 1466 | * |
| 1467 | * </ul> |
| 1468 | * |
| 1469 | * @since JDK1.1 |
| 1470 | */ |
| 1471 | public Constructor<?>[] getConstructors() throws SecurityException { |
| 1472 | // be very careful not to change the stack depth of this |
| 1473 | // checkMemberAccess call for security reasons |
| 1474 | // see java.lang.SecurityManager.checkMemberAccess |
| 1475 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 1476 | return copyConstructors(privateGetDeclaredConstructors(true)); |
| 1477 | } |
| 1478 | |
| 1479 | |
| 1480 | /** |
| 1481 | * Returns a {@code Field} object that reflects the specified public |
| 1482 | * member field of the class or interface represented by this |
| 1483 | * {@code Class} object. The {@code name} parameter is a |
| 1484 | * {@code String} specifying the simple name of the desired field. |
| 1485 | * |
| 1486 | * <p> The field to be reflected is determined by the algorithm that |
| 1487 | * follows. Let C be the class represented by this object: |
| 1488 | * <OL> |
| 1489 | * <LI> If C declares a public field with the name specified, that is the |
| 1490 | * field to be reflected.</LI> |
| 1491 | * <LI> If no field was found in step 1 above, this algorithm is applied |
| 1492 | * recursively to each direct superinterface of C. The direct |
| 1493 | * superinterfaces are searched in the order they were declared.</LI> |
| 1494 | * <LI> If no field was found in steps 1 and 2 above, and C has a |
| 1495 | * superclass S, then this algorithm is invoked recursively upon S. |
| 1496 | * If C has no superclass, then a {@code NoSuchFieldException} |
| 1497 | * is thrown.</LI> |
| 1498 | * </OL> |
| 1499 | * |
| 1500 | * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. |
| 1501 | * |
| 1502 | * @param name the field name |
| 1503 | * @return the {@code Field} object of this class specified by |
| 1504 | * {@code name} |
| 1505 | * @exception NoSuchFieldException if a field with the specified name is |
| 1506 | * not found. |
| 1507 | * @exception NullPointerException if {@code name} is {@code null} |
| 1508 | * @exception SecurityException |
| 1509 | * If a security manager, <i>s</i>, is present and any of the |
| 1510 | * following conditions is met: |
| 1511 | * |
| 1512 | * <ul> |
| 1513 | * |
| 1514 | * <li> invocation of |
| 1515 | * {@link SecurityManager#checkMemberAccess |
| 1516 | * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| 1517 | * access to the field |
| 1518 | * |
| 1519 | * <li> the caller's class loader is not the same as or an |
| 1520 | * ancestor of the class loader for the current class and |
| 1521 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1522 | * s.checkPackageAccess()} denies access to the package |
| 1523 | * of this class |
| 1524 | * |
| 1525 | * </ul> |
| 1526 | * |
| 1527 | * @since JDK1.1 |
| 1528 | */ |
| 1529 | public Field getField(String name) |
| 1530 | throws NoSuchFieldException, SecurityException { |
| 1531 | // be very careful not to change the stack depth of this |
| 1532 | // checkMemberAccess call for security reasons |
| 1533 | // see java.lang.SecurityManager.checkMemberAccess |
| 1534 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 1535 | Field field = getField0(name); |
| 1536 | if (field == null) { |
| 1537 | throw new NoSuchFieldException(name); |
| 1538 | } |
| 1539 | return field; |
| 1540 | } |
| 1541 | |
| 1542 | |
| 1543 | /** |
| 1544 | * Returns a {@code Method} object that reflects the specified public |
| 1545 | * member method of the class or interface represented by this |
| 1546 | * {@code Class} object. The {@code name} parameter is a |
| 1547 | * {@code String} specifying the simple name of the desired method. The |
| 1548 | * {@code parameterTypes} parameter is an array of {@code Class} |
| 1549 | * objects that identify the method's formal parameter types, in declared |
| 1550 | * order. If {@code parameterTypes} is {@code null}, it is |
| 1551 | * treated as if it were an empty array. |
| 1552 | * |
| 1553 | * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a |
| 1554 | * {@code NoSuchMethodException} is raised. Otherwise, the method to |
| 1555 | * be reflected is determined by the algorithm that follows. Let C be the |
| 1556 | * class represented by this object: |
| 1557 | * <OL> |
| 1558 | * <LI> C is searched for any <I>matching methods</I>. If no matching |
| 1559 | * method is found, the algorithm of step 1 is invoked recursively on |
| 1560 | * the superclass of C.</LI> |
| 1561 | * <LI> If no method was found in step 1 above, the superinterfaces of C |
| 1562 | * are searched for a matching method. If any such method is found, it |
| 1563 | * is reflected.</LI> |
| 1564 | * </OL> |
| 1565 | * |
| 1566 | * To find a matching method in a class C: If C declares exactly one |
| 1567 | * public method with the specified name and exactly the same formal |
| 1568 | * parameter types, that is the method reflected. If more than one such |
| 1569 | * method is found in C, and one of these methods has a return type that is |
| 1570 | * more specific than any of the others, that method is reflected; |
| 1571 | * otherwise one of the methods is chosen arbitrarily. |
| 1572 | * |
| 1573 | * <p>Note that there may be more than one matching method in a |
| 1574 | * class because while the Java language forbids a class to |
| 1575 | * declare multiple methods with the same signature but different |
| 1576 | * return types, the Java virtual machine does not. This |
| 1577 | * increased flexibility in the virtual machine can be used to |
| 1578 | * implement various language features. For example, covariant |
| 1579 | * returns can be implemented with {@linkplain |
| 1580 | * java.lang.reflect.Method#isBridge bridge methods}; the bridge |
| 1581 | * method and the method being overridden would have the same |
| 1582 | * signature but different return types. |
| 1583 | * |
| 1584 | * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4. |
| 1585 | * |
| 1586 | * @param name the name of the method |
| 1587 | * @param parameterTypes the list of parameters |
| 1588 | * @return the {@code Method} object that matches the specified |
| 1589 | * {@code name} and {@code parameterTypes} |
| 1590 | * @exception NoSuchMethodException if a matching method is not found |
| 1591 | * or if the name is "<init>"or "<clinit>". |
| 1592 | * @exception NullPointerException if {@code name} is {@code null} |
| 1593 | * @exception SecurityException |
| 1594 | * If a security manager, <i>s</i>, is present and any of the |
| 1595 | * following conditions is met: |
| 1596 | * |
| 1597 | * <ul> |
| 1598 | * |
| 1599 | * <li> invocation of |
| 1600 | * {@link SecurityManager#checkMemberAccess |
| 1601 | * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| 1602 | * access to the method |
| 1603 | * |
| 1604 | * <li> the caller's class loader is not the same as or an |
| 1605 | * ancestor of the class loader for the current class and |
| 1606 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1607 | * s.checkPackageAccess()} denies access to the package |
| 1608 | * of this class |
| 1609 | * |
| 1610 | * </ul> |
| 1611 | * |
| 1612 | * @since JDK1.1 |
| 1613 | */ |
| 1614 | public Method getMethod(String name, Class<?>... parameterTypes) |
| 1615 | throws NoSuchMethodException, SecurityException { |
| 1616 | // be very careful not to change the stack depth of this |
| 1617 | // checkMemberAccess call for security reasons |
| 1618 | // see java.lang.SecurityManager.checkMemberAccess |
| 1619 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 1620 | Method method = getMethod0(name, parameterTypes); |
| 1621 | if (method == null) { |
| 1622 | throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); |
| 1623 | } |
| 1624 | return method; |
| 1625 | } |
| 1626 | |
| 1627 | |
| 1628 | /** |
| 1629 | * Returns a {@code Constructor} object that reflects the specified |
| 1630 | * public constructor of the class represented by this {@code Class} |
| 1631 | * object. The {@code parameterTypes} parameter is an array of |
| 1632 | * {@code Class} objects that identify the constructor's formal |
| 1633 | * parameter types, in declared order. |
| 1634 | * |
| 1635 | * If this {@code Class} object represents an inner class |
| 1636 | * declared in a non-static context, the formal parameter types |
| 1637 | * include the explicit enclosing instance as the first parameter. |
| 1638 | * |
| 1639 | * <p> The constructor to reflect is the public constructor of the class |
| 1640 | * represented by this {@code Class} object whose formal parameter |
| 1641 | * types match those specified by {@code parameterTypes}. |
| 1642 | * |
| 1643 | * @param parameterTypes the parameter array |
| 1644 | * @return the {@code Constructor} object of the public constructor that |
| 1645 | * matches the specified {@code parameterTypes} |
| 1646 | * @exception NoSuchMethodException if a matching method is not found. |
| 1647 | * @exception SecurityException |
| 1648 | * If a security manager, <i>s</i>, is present and any of the |
| 1649 | * following conditions is met: |
| 1650 | * |
| 1651 | * <ul> |
| 1652 | * |
| 1653 | * <li> invocation of |
| 1654 | * {@link SecurityManager#checkMemberAccess |
| 1655 | * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| 1656 | * access to the constructor |
| 1657 | * |
| 1658 | * <li> the caller's class loader is not the same as or an |
| 1659 | * ancestor of the class loader for the current class and |
| 1660 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1661 | * s.checkPackageAccess()} denies access to the package |
| 1662 | * of this class |
| 1663 | * |
| 1664 | * </ul> |
| 1665 | * |
| 1666 | * @since JDK1.1 |
| 1667 | */ |
| 1668 | public Constructor<T> getConstructor(Class<?>... parameterTypes) |
| 1669 | throws NoSuchMethodException, SecurityException { |
| 1670 | // be very careful not to change the stack depth of this |
| 1671 | // checkMemberAccess call for security reasons |
| 1672 | // see java.lang.SecurityManager.checkMemberAccess |
| 1673 | checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| 1674 | return getConstructor0(parameterTypes, Member.PUBLIC); |
| 1675 | } |
| 1676 | |
| 1677 | |
| 1678 | /** |
| 1679 | * Returns an array of {@code Class} objects reflecting all the |
| 1680 | * classes and interfaces declared as members of the class represented by |
| 1681 | * this {@code Class} object. This includes public, protected, default |
| 1682 | * (package) access, and private classes and interfaces declared by the |
| 1683 | * class, but excludes inherited classes and interfaces. This method |
| 1684 | * returns an array of length 0 if the class declares no classes or |
| 1685 | * interfaces as members, or if this {@code Class} object represents a |
| 1686 | * primitive type, an array class, or void. |
| 1687 | * |
| 1688 | * @return the array of {@code Class} objects representing all the |
| 1689 | * declared members of this class |
| 1690 | * @exception SecurityException |
| 1691 | * If a security manager, <i>s</i>, is present and any of the |
| 1692 | * following conditions is met: |
| 1693 | * |
| 1694 | * <ul> |
| 1695 | * |
| 1696 | * <li> invocation of |
| 1697 | * {@link SecurityManager#checkMemberAccess |
| 1698 | * s.checkMemberAccess(this, Member.DECLARED)} denies |
| 1699 | * access to the declared classes within this class |
| 1700 | * |
| 1701 | * <li> the caller's class loader is not the same as or an |
| 1702 | * ancestor of the class loader for the current class and |
| 1703 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1704 | * s.checkPackageAccess()} denies access to the package |
| 1705 | * of this class |
| 1706 | * |
| 1707 | * </ul> |
| 1708 | * |
| 1709 | * @since JDK1.1 |
| 1710 | */ |
| 1711 | public Class<?>[] getDeclaredClasses() throws SecurityException { |
| 1712 | // be very careful not to change the stack depth of this |
| 1713 | // checkMemberAccess call for security reasons |
| 1714 | // see java.lang.SecurityManager.checkMemberAccess |
| 1715 | checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| 1716 | return getDeclaredClasses0(); |
| 1717 | } |
| 1718 | |
| 1719 | |
| 1720 | /** |
| 1721 | * Returns an array of {@code Field} objects reflecting all the fields |
| 1722 | * declared by the class or interface represented by this |
| 1723 | * {@code Class} object. This includes public, protected, default |
| 1724 | * (package) access, and private fields, but excludes inherited fields. |
| 1725 | * The elements in the array returned are not sorted and are not in any |
| 1726 | * particular order. This method returns an array of length 0 if the class |
| 1727 | * or interface declares no fields, or if this {@code Class} object |
| 1728 | * represents a primitive type, an array class, or void. |
| 1729 | * |
| 1730 | * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. |
| 1731 | * |
| 1732 | * @return the array of {@code Field} objects representing all the |
| 1733 | * declared fields of this class |
| 1734 | * @exception SecurityException |
| 1735 | * If a security manager, <i>s</i>, is present and any of the |
| 1736 | * following conditions is met: |
| 1737 | * |
| 1738 | * <ul> |
| 1739 | * |
| 1740 | * <li> invocation of |
| 1741 | * {@link SecurityManager#checkMemberAccess |
| 1742 | * s.checkMemberAccess(this, Member.DECLARED)} denies |
| 1743 | * access to the declared fields within this class |
| 1744 | * |
| 1745 | * <li> the caller's class loader is not the same as or an |
| 1746 | * ancestor of the class loader for the current class and |
| 1747 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1748 | * s.checkPackageAccess()} denies access to the package |
| 1749 | * of this class |
| 1750 | * |
| 1751 | * </ul> |
| 1752 | * |
| 1753 | * @since JDK1.1 |
| 1754 | */ |
| 1755 | public Field[] getDeclaredFields() throws SecurityException { |
| 1756 | // be very careful not to change the stack depth of this |
| 1757 | // checkMemberAccess call for security reasons |
| 1758 | // see java.lang.SecurityManager.checkMemberAccess |
| 1759 | checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| 1760 | return copyFields(privateGetDeclaredFields(false)); |
| 1761 | } |
| 1762 | |
| 1763 | |
| 1764 | /** |
| 1765 | * Returns an array of {@code Method} objects reflecting all the |
| 1766 | * methods declared by the class or interface represented by this |
| 1767 | * {@code Class} object. This includes public, protected, default |
| 1768 | * (package) access, and private methods, but excludes inherited methods. |
| 1769 | * The elements in the array returned are not sorted and are not in any |
| 1770 | * particular order. This method returns an array of length 0 if the class |
| 1771 | * or interface declares no methods, or if this {@code Class} object |
| 1772 | * represents a primitive type, an array class, or void. The class |
| 1773 | * initialization method {@code <clinit>} is not included in the |
| 1774 | * returned array. If the class declares multiple public member methods |
| 1775 | * with the same parameter types, they are all included in the returned |
| 1776 | * array. |
| 1777 | * |
| 1778 | * <p> See <em>The Java Language Specification</em>, section 8.2. |
| 1779 | * |
| 1780 | * @return the array of {@code Method} objects representing all the |
| 1781 | * declared methods of this class |
| 1782 | * @exception SecurityException |
| 1783 | * If a security manager, <i>s</i>, is present and any of the |
| 1784 | * following conditions is met: |
| 1785 | * |
| 1786 | * <ul> |
| 1787 | * |
| 1788 | * <li> invocation of |
| 1789 | * {@link SecurityManager#checkMemberAccess |
| 1790 | * s.checkMemberAccess(this, Member.DECLARED)} denies |
| 1791 | * access to the declared methods within this class |
| 1792 | * |
| 1793 | * <li> the caller's class loader is not the same as or an |
| 1794 | * ancestor of the class loader for the current class and |
| 1795 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1796 | * s.checkPackageAccess()} denies access to the package |
| 1797 | * of this class |
| 1798 | * |
| 1799 | * </ul> |
| 1800 | * |
| 1801 | * @since JDK1.1 |
| 1802 | */ |
| 1803 | public Method[] getDeclaredMethods() throws SecurityException { |
| 1804 | // be very careful not to change the stack depth of this |
| 1805 | // checkMemberAccess call for security reasons |
| 1806 | // see java.lang.SecurityManager.checkMemberAccess |
| 1807 | checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| 1808 | return copyMethods(privateGetDeclaredMethods(false)); |
| 1809 | } |
| 1810 | |
| 1811 | |
| 1812 | /** |
| 1813 | * Returns an array of {@code Constructor} objects reflecting all the |
| 1814 | * constructors declared by the class represented by this |
| 1815 | * {@code Class} object. These are public, protected, default |
| 1816 | * (package) access, and private constructors. The elements in the array |
| 1817 | * returned are not sorted and are not in any particular order. If the |
| 1818 | * class has a default constructor, it is included in the returned array. |
| 1819 | * This method returns an array of length 0 if this {@code Class} |
| 1820 | * object represents an interface, a primitive type, an array class, or |
| 1821 | * void. |
| 1822 | * |
| 1823 | * <p> See <em>The Java Language Specification</em>, section 8.2. |
| 1824 | * |
| 1825 | * @return the array of {@code Constructor} objects representing all the |
| 1826 | * declared constructors of this class |
| 1827 | * @exception SecurityException |
| 1828 | * If a security manager, <i>s</i>, is present and any of the |
| 1829 | * following conditions is met: |
| 1830 | * |
| 1831 | * <ul> |
| 1832 | * |
| 1833 | * <li> invocation of |
| 1834 | * {@link SecurityManager#checkMemberAccess |
| 1835 | * s.checkMemberAccess(this, Member.DECLARED)} denies |
| 1836 | * access to the declared constructors within this class |
| 1837 | * |
| 1838 | * <li> the caller's class loader is not the same as or an |
| 1839 | * ancestor of the class loader for the current class and |
| 1840 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1841 | * s.checkPackageAccess()} denies access to the package |
| 1842 | * of this class |
| 1843 | * |
| 1844 | * </ul> |
| 1845 | * |
| 1846 | * @since JDK1.1 |
| 1847 | */ |
| 1848 | public Constructor<?>[] getDeclaredConstructors() throws SecurityException { |
| 1849 | // be very careful not to change the stack depth of this |
| 1850 | // checkMemberAccess call for security reasons |
| 1851 | // see java.lang.SecurityManager.checkMemberAccess |
| 1852 | checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| 1853 | return copyConstructors(privateGetDeclaredConstructors(false)); |
| 1854 | } |
| 1855 | |
| 1856 | |
| 1857 | /** |
| 1858 | * Returns a {@code Field} object that reflects the specified declared |
| 1859 | * field of the class or interface represented by this {@code Class} |
| 1860 | * object. The {@code name} parameter is a {@code String} that |
| 1861 | * specifies the simple name of the desired field. Note that this method |
| 1862 | * will not reflect the {@code length} field of an array class. |
| 1863 | * |
| 1864 | * @param name the name of the field |
| 1865 | * @return the {@code Field} object for the specified field in this |
| 1866 | * class |
| 1867 | * @exception NoSuchFieldException if a field with the specified name is |
| 1868 | * not found. |
| 1869 | * @exception NullPointerException if {@code name} is {@code null} |
| 1870 | * @exception SecurityException |
| 1871 | * If a security manager, <i>s</i>, is present and any of the |
| 1872 | * following conditions is met: |
| 1873 | * |
| 1874 | * <ul> |
| 1875 | * |
| 1876 | * <li> invocation of |
| 1877 | * {@link SecurityManager#checkMemberAccess |
| 1878 | * s.checkMemberAccess(this, Member.DECLARED)} denies |
| 1879 | * access to the declared field |
| 1880 | * |
| 1881 | * <li> the caller's class loader is not the same as or an |
| 1882 | * ancestor of the class loader for the current class and |
| 1883 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1884 | * s.checkPackageAccess()} denies access to the package |
| 1885 | * of this class |
| 1886 | * |
| 1887 | * </ul> |
| 1888 | * |
| 1889 | * @since JDK1.1 |
| 1890 | */ |
| 1891 | public Field getDeclaredField(String name) |
| 1892 | throws NoSuchFieldException, SecurityException { |
| 1893 | // be very careful not to change the stack depth of this |
| 1894 | // checkMemberAccess call for security reasons |
| 1895 | // see java.lang.SecurityManager.checkMemberAccess |
| 1896 | checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| 1897 | Field field = searchFields(privateGetDeclaredFields(false), name); |
| 1898 | if (field == null) { |
| 1899 | throw new NoSuchFieldException(name); |
| 1900 | } |
| 1901 | return field; |
| 1902 | } |
| 1903 | |
| 1904 | |
| 1905 | /** |
| 1906 | * Returns a {@code Method} object that reflects the specified |
| 1907 | * declared method of the class or interface represented by this |
| 1908 | * {@code Class} object. The {@code name} parameter is a |
| 1909 | * {@code String} that specifies the simple name of the desired |
| 1910 | * method, and the {@code parameterTypes} parameter is an array of |
| 1911 | * {@code Class} objects that identify the method's formal parameter |
| 1912 | * types, in declared order. If more than one method with the same |
| 1913 | * parameter types is declared in a class, and one of these methods has a |
| 1914 | * return type that is more specific than any of the others, that method is |
| 1915 | * returned; otherwise one of the methods is chosen arbitrarily. If the |
| 1916 | * name is "<init>"or "<clinit>" a {@code NoSuchMethodException} |
| 1917 | * is raised. |
| 1918 | * |
| 1919 | * @param name the name of the method |
| 1920 | * @param parameterTypes the parameter array |
| 1921 | * @return the {@code Method} object for the method of this class |
| 1922 | * matching the specified name and parameters |
| 1923 | * @exception NoSuchMethodException if a matching method is not found. |
| 1924 | * @exception NullPointerException if {@code name} is {@code null} |
| 1925 | * @exception SecurityException |
| 1926 | * If a security manager, <i>s</i>, is present and any of the |
| 1927 | * following conditions is met: |
| 1928 | * |
| 1929 | * <ul> |
| 1930 | * |
| 1931 | * <li> invocation of |
| 1932 | * {@link SecurityManager#checkMemberAccess |
| 1933 | * s.checkMemberAccess(this, Member.DECLARED)} denies |
| 1934 | * access to the declared method |
| 1935 | * |
| 1936 | * <li> the caller's class loader is not the same as or an |
| 1937 | * ancestor of the class loader for the current class and |
| 1938 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1939 | * s.checkPackageAccess()} denies access to the package |
| 1940 | * of this class |
| 1941 | * |
| 1942 | * </ul> |
| 1943 | * |
| 1944 | * @since JDK1.1 |
| 1945 | */ |
| 1946 | public Method getDeclaredMethod(String name, Class<?>... parameterTypes) |
| 1947 | throws NoSuchMethodException, SecurityException { |
| 1948 | // be very careful not to change the stack depth of this |
| 1949 | // checkMemberAccess call for security reasons |
| 1950 | // see java.lang.SecurityManager.checkMemberAccess |
| 1951 | checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| 1952 | Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); |
| 1953 | if (method == null) { |
| 1954 | throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); |
| 1955 | } |
| 1956 | return method; |
| 1957 | } |
| 1958 | |
| 1959 | |
| 1960 | /** |
| 1961 | * Returns a {@code Constructor} object that reflects the specified |
| 1962 | * constructor of the class or interface represented by this |
| 1963 | * {@code Class} object. The {@code parameterTypes} parameter is |
| 1964 | * an array of {@code Class} objects that identify the constructor's |
| 1965 | * formal parameter types, in declared order. |
| 1966 | * |
| 1967 | * If this {@code Class} object represents an inner class |
| 1968 | * declared in a non-static context, the formal parameter types |
| 1969 | * include the explicit enclosing instance as the first parameter. |
| 1970 | * |
| 1971 | * @param parameterTypes the parameter array |
| 1972 | * @return The {@code Constructor} object for the constructor with the |
| 1973 | * specified parameter list |
| 1974 | * @exception NoSuchMethodException if a matching method is not found. |
| 1975 | * @exception SecurityException |
| 1976 | * If a security manager, <i>s</i>, is present and any of the |
| 1977 | * following conditions is met: |
| 1978 | * |
| 1979 | * <ul> |
| 1980 | * |
| 1981 | * <li> invocation of |
| 1982 | * {@link SecurityManager#checkMemberAccess |
| 1983 | * s.checkMemberAccess(this, Member.DECLARED)} denies |
| 1984 | * access to the declared constructor |
| 1985 | * |
| 1986 | * <li> the caller's class loader is not the same as or an |
| 1987 | * ancestor of the class loader for the current class and |
| 1988 | * invocation of {@link SecurityManager#checkPackageAccess |
| 1989 | * s.checkPackageAccess()} denies access to the package |
| 1990 | * of this class |
| 1991 | * |
| 1992 | * </ul> |
| 1993 | * |
| 1994 | * @since JDK1.1 |
| 1995 | */ |
| 1996 | public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) |
| 1997 | throws NoSuchMethodException, SecurityException { |
| 1998 | // be very careful not to change the stack depth of this |
| 1999 | // checkMemberAccess call for security reasons |
| 2000 | // see java.lang.SecurityManager.checkMemberAccess |
| 2001 | checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| 2002 | return getConstructor0(parameterTypes, Member.DECLARED); |
| 2003 | } |
| 2004 | |
| 2005 | /** |
| 2006 | * Finds a resource with a given name. The rules for searching resources |
| 2007 | * associated with a given class are implemented by the defining |
| 2008 | * {@linkplain ClassLoader class loader} of the class. This method |
| 2009 | * delegates to this object's class loader. If this object was loaded by |
| 2010 | * the bootstrap class loader, the method delegates to {@link |
| 2011 | * ClassLoader#getSystemResourceAsStream}. |
| 2012 | * |
| 2013 | * <p> Before delegation, an absolute resource name is constructed from the |
| 2014 | * given resource name using this algorithm: |
| 2015 | * |
| 2016 | * <ul> |
| 2017 | * |
| 2018 | * <li> If the {@code name} begins with a {@code '/'} |
| 2019 | * (<tt>'\u002f'</tt>), then the absolute name of the resource is the |
| 2020 | * portion of the {@code name} following the {@code '/'}. |
| 2021 | * |
| 2022 | * <li> Otherwise, the absolute name is of the following form: |
| 2023 | * |
| 2024 | * <blockquote> |
| 2025 | * {@code modified_package_name/name} |
| 2026 | * </blockquote> |
| 2027 | * |
| 2028 | * <p> Where the {@code modified_package_name} is the package name of this |
| 2029 | * object with {@code '/'} substituted for {@code '.'} |
| 2030 | * (<tt>'\u002e'</tt>). |
| 2031 | * |
| 2032 | * </ul> |
| 2033 | * |
| 2034 | * @param name name of the desired resource |
| 2035 | * @return A {@link java.io.InputStream} object or {@code null} if |
| 2036 | * no resource with this name is found |
| 2037 | * @throws NullPointerException If {@code name} is {@code null} |
| 2038 | * @since JDK1.1 |
| 2039 | */ |
| 2040 | public InputStream getResourceAsStream(String name) { |
| 2041 | name = resolveName(name); |
| 2042 | ClassLoader cl = getClassLoader0(); |
| 2043 | if (cl==null) { |
| 2044 | // A system class. |
| 2045 | return ClassLoader.getSystemResourceAsStream(name); |
| 2046 | } |
| 2047 | return cl.getResourceAsStream(name); |
| 2048 | } |
| 2049 | |
| 2050 | /** |
| 2051 | * Finds a resource with a given name. The rules for searching resources |
| 2052 | * associated with a given class are implemented by the defining |
| 2053 | * {@linkplain ClassLoader class loader} of the class. This method |
| 2054 | * delegates to this object's class loader. If this object was loaded by |
| 2055 | * the bootstrap class loader, the method delegates to {@link |
| 2056 | * ClassLoader#getSystemResource}. |
| 2057 | * |
| 2058 | * <p> Before delegation, an absolute resource name is constructed from the |
| 2059 | * given resource name using this algorithm: |
| 2060 | * |
| 2061 | * <ul> |
| 2062 | * |
| 2063 | * <li> If the {@code name} begins with a {@code '/'} |
| 2064 | * (<tt>'\u002f'</tt>), then the absolute name of the resource is the |
| 2065 | * portion of the {@code name} following the {@code '/'}. |
| 2066 | * |
| 2067 | * <li> Otherwise, the absolute name is of the following form: |
| 2068 | * |
| 2069 | * <blockquote> |
| 2070 | * {@code modified_package_name/name} |
| 2071 | * </blockquote> |
| 2072 | * |
| 2073 | * <p> Where the {@code modified_package_name} is the package name of this |
| 2074 | * object with {@code '/'} substituted for {@code '.'} |
| 2075 | * (<tt>'\u002e'</tt>). |
| 2076 | * |
| 2077 | * </ul> |
| 2078 | * |
| 2079 | * @param name name of the desired resource |
| 2080 | * @return A {@link java.net.URL} object or {@code null} if no |
| 2081 | * resource with this name is found |
| 2082 | * @since JDK1.1 |
| 2083 | */ |
| 2084 | public java.net.URL getResource(String name) { |
| 2085 | name = resolveName(name); |
| 2086 | ClassLoader cl = getClassLoader0(); |
| 2087 | if (cl==null) { |
| 2088 | // A system class. |
| 2089 | return ClassLoader.getSystemResource(name); |
| 2090 | } |
| 2091 | return cl.getResource(name); |
| 2092 | } |
| 2093 | |
| 2094 | |
| 2095 | |
| 2096 | /** protection domain returned when the internal domain is null */ |
| 2097 | private static java.security.ProtectionDomain allPermDomain; |
| 2098 | |
| 2099 | |
| 2100 | /** |
| 2101 | * Returns the {@code ProtectionDomain} of this class. If there is a |
| 2102 | * security manager installed, this method first calls the security |
| 2103 | * manager's {@code checkPermission} method with a |
| 2104 | * {@code RuntimePermission("getProtectionDomain")} permission to |
| 2105 | * ensure it's ok to get the |
| 2106 | * {@code ProtectionDomain}. |
| 2107 | * |
| 2108 | * @return the ProtectionDomain of this class |
| 2109 | * |
| 2110 | * @throws SecurityException |
| 2111 | * if a security manager exists and its |
| 2112 | * {@code checkPermission} method doesn't allow |
| 2113 | * getting the ProtectionDomain. |
| 2114 | * |
| 2115 | * @see java.security.ProtectionDomain |
| 2116 | * @see SecurityManager#checkPermission |
| 2117 | * @see java.lang.RuntimePermission |
| 2118 | * @since 1.2 |
| 2119 | */ |
| 2120 | public java.security.ProtectionDomain getProtectionDomain() { |
| 2121 | SecurityManager sm = System.getSecurityManager(); |
| 2122 | if (sm != null) { |
| 2123 | sm.checkPermission(SecurityConstants.GET_PD_PERMISSION); |
| 2124 | } |
| 2125 | java.security.ProtectionDomain pd = getProtectionDomain0(); |
| 2126 | if (pd == null) { |
| 2127 | if (allPermDomain == null) { |
| 2128 | java.security.Permissions perms = |
| 2129 | new java.security.Permissions(); |
| 2130 | perms.add(SecurityConstants.ALL_PERMISSION); |
| 2131 | allPermDomain = |
| 2132 | new java.security.ProtectionDomain(null, perms); |
| 2133 | } |
| 2134 | pd = allPermDomain; |
| 2135 | } |
| 2136 | return pd; |
| 2137 | } |
| 2138 | |
| 2139 | |
| 2140 | /** |
| 2141 | * Returns the ProtectionDomain of this class. |
| 2142 | */ |
| 2143 | private native java.security.ProtectionDomain getProtectionDomain0(); |
| 2144 | |
| 2145 | |
| 2146 | /** |
| 2147 | * Set the ProtectionDomain for this class. Called by |
| 2148 | * ClassLoader.defineClass. |
| 2149 | */ |
| 2150 | native void setProtectionDomain0(java.security.ProtectionDomain pd); |
| 2151 | |
| 2152 | |
| 2153 | /* |
| 2154 | * Return the Virtual Machine's Class object for the named |
| 2155 | * primitive type. |
| 2156 | */ |
| 2157 | static native Class getPrimitiveClass(String name); |
| 2158 | |
| 2159 | |
| 2160 | /* |
| 2161 | * Check if client is allowed to access members. If access is denied, |
| 2162 | * throw a SecurityException. |
| 2163 | * |
| 2164 | * Be very careful not to change the stack depth of this checkMemberAccess |
| 2165 | * call for security reasons. |
| 2166 | * See java.lang.SecurityManager.checkMemberAccess. |
| 2167 | * |
| 2168 | * <p> Default policy: allow all clients access with normal Java access |
| 2169 | * control. |
| 2170 | */ |
| 2171 | private void checkMemberAccess(int which, ClassLoader ccl) { |
| 2172 | SecurityManager s = System.getSecurityManager(); |
| 2173 | if (s != null) { |
| 2174 | s.checkMemberAccess(this, which); |
| 2175 | ClassLoader cl = getClassLoader0(); |
| 2176 | if ((ccl != null) && (ccl != cl) && |
| 2177 | ((cl == null) || !cl.isAncestor(ccl))) { |
| 2178 | String name = this.getName(); |
| 2179 | int i = name.lastIndexOf('.'); |
| 2180 | if (i != -1) { |
| 2181 | s.checkPackageAccess(name.substring(0, i)); |
| 2182 | } |
| 2183 | } |
| 2184 | } |
| 2185 | } |
| 2186 | |
| 2187 | /** |
| 2188 | * Add a package name prefix if the name is not absolute Remove leading "/" |
| 2189 | * if name is absolute |
| 2190 | */ |
| 2191 | private String resolveName(String name) { |
| 2192 | if (name == null) { |
| 2193 | return name; |
| 2194 | } |
| 2195 | if (!name.startsWith("/")) { |
| 2196 | Class c = this; |
| 2197 | while (c.isArray()) { |
| 2198 | c = c.getComponentType(); |
| 2199 | } |
| 2200 | String baseName = c.getName(); |
| 2201 | int index = baseName.lastIndexOf('.'); |
| 2202 | if (index != -1) { |
| 2203 | name = baseName.substring(0, index).replace('.', '/') |
| 2204 | +"/"+name; |
| 2205 | } |
| 2206 | } else { |
| 2207 | name = name.substring(1); |
| 2208 | } |
| 2209 | return name; |
| 2210 | } |
| 2211 | |
| 2212 | /** |
| 2213 | * Reflection support. |
| 2214 | */ |
| 2215 | |
| 2216 | // Caches for certain reflective results |
| 2217 | private static boolean useCaches = true; |
| 2218 | private volatile transient SoftReference declaredFields; |
| 2219 | private volatile transient SoftReference publicFields; |
| 2220 | private volatile transient SoftReference declaredMethods; |
| 2221 | private volatile transient SoftReference publicMethods; |
| 2222 | private volatile transient SoftReference declaredConstructors; |
| 2223 | private volatile transient SoftReference publicConstructors; |
| 2224 | // Intermediate results for getFields and getMethods |
| 2225 | private volatile transient SoftReference declaredPublicFields; |
| 2226 | private volatile transient SoftReference declaredPublicMethods; |
| 2227 | |
| 2228 | // Incremented by the VM on each call to JVM TI RedefineClasses() |
| 2229 | // that redefines this class or a superclass. |
| 2230 | private volatile transient int classRedefinedCount = 0; |
| 2231 | |
| 2232 | // Value of classRedefinedCount when we last cleared the cached values |
| 2233 | // that are sensitive to class redefinition. |
| 2234 | private volatile transient int lastRedefinedCount = 0; |
| 2235 | |
| 2236 | // Clears cached values that might possibly have been obsoleted by |
| 2237 | // a class redefinition. |
| 2238 | private void clearCachesOnClassRedefinition() { |
| 2239 | if (lastRedefinedCount != classRedefinedCount) { |
| 2240 | declaredFields = publicFields = declaredPublicFields = null; |
| 2241 | declaredMethods = publicMethods = declaredPublicMethods = null; |
| 2242 | declaredConstructors = publicConstructors = null; |
| 2243 | annotations = declaredAnnotations = null; |
| 2244 | |
| 2245 | // Use of "volatile" (and synchronization by caller in the case |
| 2246 | // of annotations) ensures that no thread sees the update to |
| 2247 | // lastRedefinedCount before seeing the caches cleared. |
| 2248 | // We do not guard against brief windows during which multiple |
| 2249 | // threads might redundantly work to fill an empty cache. |
| 2250 | lastRedefinedCount = classRedefinedCount; |
| 2251 | } |
| 2252 | } |
| 2253 | |
| 2254 | // Generic signature handling |
| 2255 | private native String getGenericSignature(); |
| 2256 | |
| 2257 | // Generic info repository; lazily initialized |
| 2258 | private transient ClassRepository genericInfo; |
| 2259 | |
| 2260 | // accessor for factory |
| 2261 | private GenericsFactory getFactory() { |
| 2262 | // create scope and factory |
| 2263 | return CoreReflectionFactory.make(this, ClassScope.make(this)); |
| 2264 | } |
| 2265 | |
| 2266 | // accessor for generic info repository |
| 2267 | private ClassRepository getGenericInfo() { |
| 2268 | // lazily initialize repository if necessary |
| 2269 | if (genericInfo == null) { |
| 2270 | // create and cache generic info repository |
| 2271 | genericInfo = ClassRepository.make(getGenericSignature(), |
| 2272 | getFactory()); |
| 2273 | } |
| 2274 | return genericInfo; //return cached repository |
| 2275 | } |
| 2276 | |
| 2277 | // Annotations handling |
| 2278 | private native byte[] getRawAnnotations(); |
| 2279 | |
| 2280 | native ConstantPool getConstantPool(); |
| 2281 | |
| 2282 | // |
| 2283 | // |
| 2284 | // java.lang.reflect.Field handling |
| 2285 | // |
| 2286 | // |
| 2287 | |
| 2288 | // Returns an array of "root" fields. These Field objects must NOT |
| 2289 | // be propagated to the outside world, but must instead be copied |
| 2290 | // via ReflectionFactory.copyField. |
| 2291 | private Field[] privateGetDeclaredFields(boolean publicOnly) { |
| 2292 | checkInitted(); |
| 2293 | Field[] res = null; |
| 2294 | if (useCaches) { |
| 2295 | clearCachesOnClassRedefinition(); |
| 2296 | if (publicOnly) { |
| 2297 | if (declaredPublicFields != null) { |
| 2298 | res = (Field[]) declaredPublicFields.get(); |
| 2299 | } |
| 2300 | } else { |
| 2301 | if (declaredFields != null) { |
| 2302 | res = (Field[]) declaredFields.get(); |
| 2303 | } |
| 2304 | } |
| 2305 | if (res != null) return res; |
| 2306 | } |
| 2307 | // No cached value available; request value from VM |
| 2308 | res = Reflection.filterFields(this, getDeclaredFields0(publicOnly)); |
| 2309 | if (useCaches) { |
| 2310 | if (publicOnly) { |
| 2311 | declaredPublicFields = new SoftReference(res); |
| 2312 | } else { |
| 2313 | declaredFields = new SoftReference(res); |
| 2314 | } |
| 2315 | } |
| 2316 | return res; |
| 2317 | } |
| 2318 | |
| 2319 | // Returns an array of "root" fields. These Field objects must NOT |
| 2320 | // be propagated to the outside world, but must instead be copied |
| 2321 | // via ReflectionFactory.copyField. |
| 2322 | private Field[] privateGetPublicFields(Set traversedInterfaces) { |
| 2323 | checkInitted(); |
| 2324 | Field[] res = null; |
| 2325 | if (useCaches) { |
| 2326 | clearCachesOnClassRedefinition(); |
| 2327 | if (publicFields != null) { |
| 2328 | res = (Field[]) publicFields.get(); |
| 2329 | } |
| 2330 | if (res != null) return res; |
| 2331 | } |
| 2332 | |
| 2333 | // No cached value available; compute value recursively. |
| 2334 | // Traverse in correct order for getField(). |
| 2335 | List fields = new ArrayList(); |
| 2336 | if (traversedInterfaces == null) { |
| 2337 | traversedInterfaces = new HashSet(); |
| 2338 | } |
| 2339 | |
| 2340 | // Local fields |
| 2341 | Field[] tmp = privateGetDeclaredFields(true); |
| 2342 | addAll(fields, tmp); |
| 2343 | |
| 2344 | // Direct superinterfaces, recursively |
| 2345 | Class[] interfaces = getInterfaces(); |
| 2346 | for (int i = 0; i < interfaces.length; i++) { |
| 2347 | Class c = interfaces[i]; |
| 2348 | if (!traversedInterfaces.contains(c)) { |
| 2349 | traversedInterfaces.add(c); |
| 2350 | addAll(fields, c.privateGetPublicFields(traversedInterfaces)); |
| 2351 | } |
| 2352 | } |
| 2353 | |
| 2354 | // Direct superclass, recursively |
| 2355 | if (!isInterface()) { |
| 2356 | Class c = getSuperclass(); |
| 2357 | if (c != null) { |
| 2358 | addAll(fields, c.privateGetPublicFields(traversedInterfaces)); |
| 2359 | } |
| 2360 | } |
| 2361 | |
| 2362 | res = new Field[fields.size()]; |
| 2363 | fields.toArray(res); |
| 2364 | if (useCaches) { |
| 2365 | publicFields = new SoftReference(res); |
| 2366 | } |
| 2367 | return res; |
| 2368 | } |
| 2369 | |
| 2370 | private static void addAll(Collection c, Field[] o) { |
| 2371 | for (int i = 0; i < o.length; i++) { |
| 2372 | c.add(o[i]); |
| 2373 | } |
| 2374 | } |
| 2375 | |
| 2376 | |
| 2377 | // |
| 2378 | // |
| 2379 | // java.lang.reflect.Constructor handling |
| 2380 | // |
| 2381 | // |
| 2382 | |
| 2383 | // Returns an array of "root" constructors. These Constructor |
| 2384 | // objects must NOT be propagated to the outside world, but must |
| 2385 | // instead be copied via ReflectionFactory.copyConstructor. |
| 2386 | private Constructor[] privateGetDeclaredConstructors(boolean publicOnly) { |
| 2387 | checkInitted(); |
| 2388 | Constructor[] res = null; |
| 2389 | if (useCaches) { |
| 2390 | clearCachesOnClassRedefinition(); |
| 2391 | if (publicOnly) { |
| 2392 | if (publicConstructors != null) { |
| 2393 | res = (Constructor[]) publicConstructors.get(); |
| 2394 | } |
| 2395 | } else { |
| 2396 | if (declaredConstructors != null) { |
| 2397 | res = (Constructor[]) declaredConstructors.get(); |
| 2398 | } |
| 2399 | } |
| 2400 | if (res != null) return res; |
| 2401 | } |
| 2402 | // No cached value available; request value from VM |
| 2403 | if (isInterface()) { |
| 2404 | res = new Constructor[0]; |
| 2405 | } else { |
| 2406 | res = getDeclaredConstructors0(publicOnly); |
| 2407 | } |
| 2408 | if (useCaches) { |
| 2409 | if (publicOnly) { |
| 2410 | publicConstructors = new SoftReference(res); |
| 2411 | } else { |
| 2412 | declaredConstructors = new SoftReference(res); |
| 2413 | } |
| 2414 | } |
| 2415 | return res; |
| 2416 | } |
| 2417 | |
| 2418 | // |
| 2419 | // |
| 2420 | // java.lang.reflect.Method handling |
| 2421 | // |
| 2422 | // |
| 2423 | |
| 2424 | // Returns an array of "root" methods. These Method objects must NOT |
| 2425 | // be propagated to the outside world, but must instead be copied |
| 2426 | // via ReflectionFactory.copyMethod. |
| 2427 | private Method[] privateGetDeclaredMethods(boolean publicOnly) { |
| 2428 | checkInitted(); |
| 2429 | Method[] res = null; |
| 2430 | if (useCaches) { |
| 2431 | clearCachesOnClassRedefinition(); |
| 2432 | if (publicOnly) { |
| 2433 | if (declaredPublicMethods != null) { |
| 2434 | res = (Method[]) declaredPublicMethods.get(); |
| 2435 | } |
| 2436 | } else { |
| 2437 | if (declaredMethods != null) { |
| 2438 | res = (Method[]) declaredMethods.get(); |
| 2439 | } |
| 2440 | } |
| 2441 | if (res != null) return res; |
| 2442 | } |
| 2443 | // No cached value available; request value from VM |
| 2444 | res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly)); |
| 2445 | if (useCaches) { |
| 2446 | if (publicOnly) { |
| 2447 | declaredPublicMethods = new SoftReference(res); |
| 2448 | } else { |
| 2449 | declaredMethods = new SoftReference(res); |
| 2450 | } |
| 2451 | } |
| 2452 | return res; |
| 2453 | } |
| 2454 | |
| 2455 | static class MethodArray { |
| 2456 | private Method[] methods; |
| 2457 | private int length; |
| 2458 | |
| 2459 | MethodArray() { |
| 2460 | methods = new Method[20]; |
| 2461 | length = 0; |
| 2462 | } |
| 2463 | |
| 2464 | void add(Method m) { |
| 2465 | if (length == methods.length) { |
| 2466 | methods = Arrays.copyOf(methods, 2 * methods.length); |
| 2467 | } |
| 2468 | methods[length++] = m; |
| 2469 | } |
| 2470 | |
| 2471 | void addAll(Method[] ma) { |
| 2472 | for (int i = 0; i < ma.length; i++) { |
| 2473 | add(ma[i]); |
| 2474 | } |
| 2475 | } |
| 2476 | |
| 2477 | void addAll(MethodArray ma) { |
| 2478 | for (int i = 0; i < ma.length(); i++) { |
| 2479 | add(ma.get(i)); |
| 2480 | } |
| 2481 | } |
| 2482 | |
| 2483 | void addIfNotPresent(Method newMethod) { |
| 2484 | for (int i = 0; i < length; i++) { |
| 2485 | Method m = methods[i]; |
| 2486 | if (m == newMethod || (m != null && m.equals(newMethod))) { |
| 2487 | return; |
| 2488 | } |
| 2489 | } |
| 2490 | add(newMethod); |
| 2491 | } |
| 2492 | |
| 2493 | void addAllIfNotPresent(MethodArray newMethods) { |
| 2494 | for (int i = 0; i < newMethods.length(); i++) { |
| 2495 | Method m = newMethods.get(i); |
| 2496 | if (m != null) { |
| 2497 | addIfNotPresent(m); |
| 2498 | } |
| 2499 | } |
| 2500 | } |
| 2501 | |
| 2502 | int length() { |
| 2503 | return length; |
| 2504 | } |
| 2505 | |
| 2506 | Method get(int i) { |
| 2507 | return methods[i]; |
| 2508 | } |
| 2509 | |
| 2510 | void removeByNameAndSignature(Method toRemove) { |
| 2511 | for (int i = 0; i < length; i++) { |
| 2512 | Method m = methods[i]; |
| 2513 | if (m != null && |
| 2514 | m.getReturnType() == toRemove.getReturnType() && |
| 2515 | m.getName() == toRemove.getName() && |
| 2516 | arrayContentsEq(m.getParameterTypes(), |
| 2517 | toRemove.getParameterTypes())) { |
| 2518 | methods[i] = null; |
| 2519 | } |
| 2520 | } |
| 2521 | } |
| 2522 | |
| 2523 | void compactAndTrim() { |
| 2524 | int newPos = 0; |
| 2525 | // Get rid of null slots |
| 2526 | for (int pos = 0; pos < length; pos++) { |
| 2527 | Method m = methods[pos]; |
| 2528 | if (m != null) { |
| 2529 | if (pos != newPos) { |
| 2530 | methods[newPos] = m; |
| 2531 | } |
| 2532 | newPos++; |
| 2533 | } |
| 2534 | } |
| 2535 | if (newPos != methods.length) { |
| 2536 | methods = Arrays.copyOf(methods, newPos); |
| 2537 | } |
| 2538 | } |
| 2539 | |
| 2540 | Method[] getArray() { |
| 2541 | return methods; |
| 2542 | } |
| 2543 | } |
| 2544 | |
| 2545 | |
| 2546 | // Returns an array of "root" methods. These Method objects must NOT |
| 2547 | // be propagated to the outside world, but must instead be copied |
| 2548 | // via ReflectionFactory.copyMethod. |
| 2549 | private Method[] privateGetPublicMethods() { |
| 2550 | checkInitted(); |
| 2551 | Method[] res = null; |
| 2552 | if (useCaches) { |
| 2553 | clearCachesOnClassRedefinition(); |
| 2554 | if (publicMethods != null) { |
| 2555 | res = (Method[]) publicMethods.get(); |
| 2556 | } |
| 2557 | if (res != null) return res; |
| 2558 | } |
| 2559 | |
| 2560 | // No cached value available; compute value recursively. |
| 2561 | // Start by fetching public declared methods |
| 2562 | MethodArray methods = new MethodArray(); |
| 2563 | { |
| 2564 | Method[] tmp = privateGetDeclaredMethods(true); |
| 2565 | methods.addAll(tmp); |
| 2566 | } |
| 2567 | // Now recur over superclass and direct superinterfaces. |
| 2568 | // Go over superinterfaces first so we can more easily filter |
| 2569 | // out concrete implementations inherited from superclasses at |
| 2570 | // the end. |
| 2571 | MethodArray inheritedMethods = new MethodArray(); |
| 2572 | Class[] interfaces = getInterfaces(); |
| 2573 | for (int i = 0; i < interfaces.length; i++) { |
| 2574 | inheritedMethods.addAll(interfaces[i].privateGetPublicMethods()); |
| 2575 | } |
| 2576 | if (!isInterface()) { |
| 2577 | Class c = getSuperclass(); |
| 2578 | if (c != null) { |
| 2579 | MethodArray supers = new MethodArray(); |
| 2580 | supers.addAll(c.privateGetPublicMethods()); |
| 2581 | // Filter out concrete implementations of any |
| 2582 | // interface methods |
| 2583 | for (int i = 0; i < supers.length(); i++) { |
| 2584 | Method m = supers.get(i); |
| 2585 | if (m != null && !Modifier.isAbstract(m.getModifiers())) { |
| 2586 | inheritedMethods.removeByNameAndSignature(m); |
| 2587 | } |
| 2588 | } |
| 2589 | // Insert superclass's inherited methods before |
| 2590 | // superinterfaces' to satisfy getMethod's search |
| 2591 | // order |
| 2592 | supers.addAll(inheritedMethods); |
| 2593 | inheritedMethods = supers; |
| 2594 | } |
| 2595 | } |
| 2596 | // Filter out all local methods from inherited ones |
| 2597 | for (int i = 0; i < methods.length(); i++) { |
| 2598 | Method m = methods.get(i); |
| 2599 | inheritedMethods.removeByNameAndSignature(m); |
| 2600 | } |
| 2601 | methods.addAllIfNotPresent(inheritedMethods); |
| 2602 | methods.compactAndTrim(); |
| 2603 | res = methods.getArray(); |
| 2604 | if (useCaches) { |
| 2605 | publicMethods = new SoftReference(res); |
| 2606 | } |
| 2607 | return res; |
| 2608 | } |
| 2609 | |
| 2610 | |
| 2611 | // |
| 2612 | // Helpers for fetchers of one field, method, or constructor |
| 2613 | // |
| 2614 | |
| 2615 | private Field searchFields(Field[] fields, String name) { |
| 2616 | String internedName = name.intern(); |
| 2617 | for (int i = 0; i < fields.length; i++) { |
| 2618 | if (fields[i].getName() == internedName) { |
| 2619 | return getReflectionFactory().copyField(fields[i]); |
| 2620 | } |
| 2621 | } |
| 2622 | return null; |
| 2623 | } |
| 2624 | |
| 2625 | private Field getField0(String name) throws NoSuchFieldException { |
| 2626 | // Note: the intent is that the search algorithm this routine |
| 2627 | // uses be equivalent to the ordering imposed by |
| 2628 | // privateGetPublicFields(). It fetches only the declared |
| 2629 | // public fields for each class, however, to reduce the number |
| 2630 | // of Field objects which have to be created for the common |
| 2631 | // case where the field being requested is declared in the |
| 2632 | // class which is being queried. |
| 2633 | Field res = null; |
| 2634 | // Search declared public fields |
| 2635 | if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) { |
| 2636 | return res; |
| 2637 | } |
| 2638 | // Direct superinterfaces, recursively |
| 2639 | Class[] interfaces = getInterfaces(); |
| 2640 | for (int i = 0; i < interfaces.length; i++) { |
| 2641 | Class c = interfaces[i]; |
| 2642 | if ((res = c.getField0(name)) != null) { |
| 2643 | return res; |
| 2644 | } |
| 2645 | } |
| 2646 | // Direct superclass, recursively |
| 2647 | if (!isInterface()) { |
| 2648 | Class c = getSuperclass(); |
| 2649 | if (c != null) { |
| 2650 | if ((res = c.getField0(name)) != null) { |
| 2651 | return res; |
| 2652 | } |
| 2653 | } |
| 2654 | } |
| 2655 | return null; |
| 2656 | } |
| 2657 | |
| 2658 | private static Method searchMethods(Method[] methods, |
| 2659 | String name, |
| 2660 | Class[] parameterTypes) |
| 2661 | { |
| 2662 | Method res = null; |
| 2663 | String internedName = name.intern(); |
| 2664 | for (int i = 0; i < methods.length; i++) { |
| 2665 | Method m = methods[i]; |
| 2666 | if (m.getName() == internedName |
| 2667 | && arrayContentsEq(parameterTypes, m.getParameterTypes()) |
| 2668 | && (res == null |
| 2669 | || res.getReturnType().isAssignableFrom(m.getReturnType()))) |
| 2670 | res = m; |
| 2671 | } |
| 2672 | |
| 2673 | return (res == null ? res : getReflectionFactory().copyMethod(res)); |
| 2674 | } |
| 2675 | |
| 2676 | |
| 2677 | private Method getMethod0(String name, Class[] parameterTypes) { |
| 2678 | // Note: the intent is that the search algorithm this routine |
| 2679 | // uses be equivalent to the ordering imposed by |
| 2680 | // privateGetPublicMethods(). It fetches only the declared |
| 2681 | // public methods for each class, however, to reduce the |
| 2682 | // number of Method objects which have to be created for the |
| 2683 | // common case where the method being requested is declared in |
| 2684 | // the class which is being queried. |
| 2685 | Method res = null; |
| 2686 | // Search declared public methods |
| 2687 | if ((res = searchMethods(privateGetDeclaredMethods(true), |
| 2688 | name, |
| 2689 | parameterTypes)) != null) { |
| 2690 | return res; |
| 2691 | } |
| 2692 | // Search superclass's methods |
| 2693 | if (!isInterface()) { |
| 2694 | Class c = getSuperclass(); |
| 2695 | if (c != null) { |
| 2696 | if ((res = c.getMethod0(name, parameterTypes)) != null) { |
| 2697 | return res; |
| 2698 | } |
| 2699 | } |
| 2700 | } |
| 2701 | // Search superinterfaces' methods |
| 2702 | Class[] interfaces = getInterfaces(); |
| 2703 | for (int i = 0; i < interfaces.length; i++) { |
| 2704 | Class c = interfaces[i]; |
| 2705 | if ((res = c.getMethod0(name, parameterTypes)) != null) { |
| 2706 | return res; |
| 2707 | } |
| 2708 | } |
| 2709 | // Not found |
| 2710 | return null; |
| 2711 | } |
| 2712 | |
| 2713 | private Constructor<T> getConstructor0(Class[] parameterTypes, |
| 2714 | int which) throws NoSuchMethodException |
| 2715 | { |
| 2716 | Constructor[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC)); |
| 2717 | for (int i = 0; i < constructors.length; i++) { |
| 2718 | if (arrayContentsEq(parameterTypes, |
| 2719 | constructors[i].getParameterTypes())) { |
| 2720 | return getReflectionFactory().copyConstructor(constructors[i]); |
| 2721 | } |
| 2722 | } |
| 2723 | throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes)); |
| 2724 | } |
| 2725 | |
| 2726 | // |
| 2727 | // Other helpers and base implementation |
| 2728 | // |
| 2729 | |
| 2730 | private static boolean arrayContentsEq(Object[] a1, Object[] a2) { |
| 2731 | if (a1 == null) { |
| 2732 | return a2 == null || a2.length == 0; |
| 2733 | } |
| 2734 | |
| 2735 | if (a2 == null) { |
| 2736 | return a1.length == 0; |
| 2737 | } |
| 2738 | |
| 2739 | if (a1.length != a2.length) { |
| 2740 | return false; |
| 2741 | } |
| 2742 | |
| 2743 | for (int i = 0; i < a1.length; i++) { |
| 2744 | if (a1[i] != a2[i]) { |
| 2745 | return false; |
| 2746 | } |
| 2747 | } |
| 2748 | |
| 2749 | return true; |
| 2750 | } |
| 2751 | |
| 2752 | private static Field[] copyFields(Field[] arg) { |
| 2753 | Field[] out = new Field[arg.length]; |
| 2754 | ReflectionFactory fact = getReflectionFactory(); |
| 2755 | for (int i = 0; i < arg.length; i++) { |
| 2756 | out[i] = fact.copyField(arg[i]); |
| 2757 | } |
| 2758 | return out; |
| 2759 | } |
| 2760 | |
| 2761 | private static Method[] copyMethods(Method[] arg) { |
| 2762 | Method[] out = new Method[arg.length]; |
| 2763 | ReflectionFactory fact = getReflectionFactory(); |
| 2764 | for (int i = 0; i < arg.length; i++) { |
| 2765 | out[i] = fact.copyMethod(arg[i]); |
| 2766 | } |
| 2767 | return out; |
| 2768 | } |
| 2769 | |
| 2770 | private static Constructor[] copyConstructors(Constructor[] arg) { |
| 2771 | Constructor[] out = new Constructor[arg.length]; |
| 2772 | ReflectionFactory fact = getReflectionFactory(); |
| 2773 | for (int i = 0; i < arg.length; i++) { |
| 2774 | out[i] = fact.copyConstructor(arg[i]); |
| 2775 | } |
| 2776 | return out; |
| 2777 | } |
| 2778 | |
| 2779 | private native Field[] getDeclaredFields0(boolean publicOnly); |
| 2780 | private native Method[] getDeclaredMethods0(boolean publicOnly); |
| 2781 | private native Constructor[] getDeclaredConstructors0(boolean publicOnly); |
| 2782 | private native Class[] getDeclaredClasses0(); |
| 2783 | |
| 2784 | private static String argumentTypesToString(Class[] argTypes) { |
| 2785 | StringBuilder buf = new StringBuilder(); |
| 2786 | buf.append("("); |
| 2787 | if (argTypes != null) { |
| 2788 | for (int i = 0; i < argTypes.length; i++) { |
| 2789 | if (i > 0) { |
| 2790 | buf.append(", "); |
| 2791 | } |
| 2792 | Class c = argTypes[i]; |
| 2793 | buf.append((c == null) ? "null" : c.getName()); |
| 2794 | } |
| 2795 | } |
| 2796 | buf.append(")"); |
| 2797 | return buf.toString(); |
| 2798 | } |
| 2799 | |
| 2800 | /** use serialVersionUID from JDK 1.1 for interoperability */ |
| 2801 | private static final long serialVersionUID = 3206093459760846163L; |
| 2802 | |
| 2803 | |
| 2804 | /** |
| 2805 | * Class Class is special cased within the Serialization Stream Protocol. |
| 2806 | * |
| 2807 | * A Class instance is written initially into an ObjectOutputStream in the |
| 2808 | * following format: |
| 2809 | * <pre> |
| 2810 | * {@code TC_CLASS} ClassDescriptor |
| 2811 | * A ClassDescriptor is a special cased serialization of |
| 2812 | * a {@code java.io.ObjectStreamClass} instance. |
| 2813 | * </pre> |
| 2814 | * A new handle is generated for the initial time the class descriptor |
| 2815 | * is written into the stream. Future references to the class descriptor |
| 2816 | * are written as references to the initial class descriptor instance. |
| 2817 | * |
| 2818 | * @see java.io.ObjectStreamClass |
| 2819 | */ |
| 2820 | private static final ObjectStreamField[] serialPersistentFields = |
| 2821 | new ObjectStreamField[0]; |
| 2822 | |
| 2823 | |
| 2824 | /** |
| 2825 | * Returns the assertion status that would be assigned to this |
| 2826 | * class if it were to be initialized at the time this method is invoked. |
| 2827 | * If this class has had its assertion status set, the most recent |
| 2828 | * setting will be returned; otherwise, if any package default assertion |
| 2829 | * status pertains to this class, the most recent setting for the most |
| 2830 | * specific pertinent package default assertion status is returned; |
| 2831 | * otherwise, if this class is not a system class (i.e., it has a |
| 2832 | * class loader) its class loader's default assertion status is returned; |
| 2833 | * otherwise, the system class default assertion status is returned. |
| 2834 | * <p> |
| 2835 | * Few programmers will have any need for this method; it is provided |
| 2836 | * for the benefit of the JRE itself. (It allows a class to determine at |
| 2837 | * the time that it is initialized whether assertions should be enabled.) |
| 2838 | * Note that this method is not guaranteed to return the actual |
| 2839 | * assertion status that was (or will be) associated with the specified |
| 2840 | * class when it was (or will be) initialized. |
| 2841 | * |
| 2842 | * @return the desired assertion status of the specified class. |
| 2843 | * @see java.lang.ClassLoader#setClassAssertionStatus |
| 2844 | * @see java.lang.ClassLoader#setPackageAssertionStatus |
| 2845 | * @see java.lang.ClassLoader#setDefaultAssertionStatus |
| 2846 | * @since 1.4 |
| 2847 | */ |
| 2848 | public boolean desiredAssertionStatus() { |
| 2849 | ClassLoader loader = getClassLoader(); |
| 2850 | // If the loader is null this is a system class, so ask the VM |
| 2851 | if (loader == null) |
| 2852 | return desiredAssertionStatus0(this); |
| 2853 | |
| 2854 | synchronized(loader) { |
| 2855 | // If the classloader has been initialized with |
| 2856 | // the assertion directives, ask it. Otherwise, |
| 2857 | // ask the VM. |
| 2858 | return (loader.classAssertionStatus == null ? |
| 2859 | desiredAssertionStatus0(this) : |
| 2860 | loader.desiredAssertionStatus(getName())); |
| 2861 | } |
| 2862 | } |
| 2863 | |
| 2864 | // Retrieves the desired assertion status of this class from the VM |
| 2865 | private static native boolean desiredAssertionStatus0(Class clazz); |
| 2866 | |
| 2867 | /** |
| 2868 | * Returns true if and only if this class was declared as an enum in the |
| 2869 | * source code. |
| 2870 | * |
| 2871 | * @return true if and only if this class was declared as an enum in the |
| 2872 | * source code |
| 2873 | * @since 1.5 |
| 2874 | */ |
| 2875 | public boolean isEnum() { |
| 2876 | // An enum must both directly extend java.lang.Enum and have |
| 2877 | // the ENUM bit set; classes for specialized enum constants |
| 2878 | // don't do the former. |
| 2879 | return (this.getModifiers() & ENUM) != 0 && |
| 2880 | this.getSuperclass() == java.lang.Enum.class; |
| 2881 | } |
| 2882 | |
| 2883 | // Fetches the factory for reflective objects |
| 2884 | private static ReflectionFactory getReflectionFactory() { |
| 2885 | if (reflectionFactory == null) { |
| 2886 | reflectionFactory = (ReflectionFactory) |
| 2887 | java.security.AccessController.doPrivileged |
| 2888 | (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction()); |
| 2889 | } |
| 2890 | return reflectionFactory; |
| 2891 | } |
| 2892 | private static ReflectionFactory reflectionFactory; |
| 2893 | |
| 2894 | // To be able to query system properties as soon as they're available |
| 2895 | private static boolean initted = false; |
| 2896 | private static void checkInitted() { |
| 2897 | if (initted) return; |
| 2898 | AccessController.doPrivileged(new PrivilegedAction() { |
| 2899 | public Object run() { |
| 2900 | // Tests to ensure the system properties table is fully |
| 2901 | // initialized. This is needed because reflection code is |
| 2902 | // called very early in the initialization process (before |
| 2903 | // command-line arguments have been parsed and therefore |
| 2904 | // these user-settable properties installed.) We assume that |
| 2905 | // if System.out is non-null then the System class has been |
| 2906 | // fully initialized and that the bulk of the startup code |
| 2907 | // has been run. |
| 2908 | |
| 2909 | if (System.out == null) { |
| 2910 | // java.lang.System not yet fully initialized |
| 2911 | return null; |
| 2912 | } |
| 2913 | |
| 2914 | String val = |
| 2915 | System.getProperty("sun.reflect.noCaches"); |
| 2916 | if (val != null && val.equals("true")) { |
| 2917 | useCaches = false; |
| 2918 | } |
| 2919 | |
| 2920 | initted = true; |
| 2921 | return null; |
| 2922 | } |
| 2923 | }); |
| 2924 | } |
| 2925 | |
| 2926 | /** |
| 2927 | * Returns the elements of this enum class or null if this |
| 2928 | * Class object does not represent an enum type. |
| 2929 | * |
| 2930 | * @return an array containing the values comprising the enum class |
| 2931 | * represented by this Class object in the order they're |
| 2932 | * declared, or null if this Class object does not |
| 2933 | * represent an enum type |
| 2934 | * @since 1.5 |
| 2935 | */ |
| 2936 | public T[] getEnumConstants() { |
| 2937 | T[] values = getEnumConstantsShared(); |
| 2938 | return (values != null) ? values.clone() : null; |
| 2939 | } |
| 2940 | |
| 2941 | /** |
| 2942 | * Returns the elements of this enum class or null if this |
| 2943 | * Class object does not represent an enum type; |
| 2944 | * identical to getEnumConstantsShared except that |
| 2945 | * the result is uncloned, cached, and shared by all callers. |
| 2946 | */ |
| 2947 | T[] getEnumConstantsShared() { |
| 2948 | if (enumConstants == null) { |
| 2949 | if (!isEnum()) return null; |
| 2950 | try { |
| 2951 | final Method values = getMethod("values"); |
| 2952 | java.security.AccessController.doPrivileged |
| 2953 | (new java.security.PrivilegedAction() { |
| 2954 | public Object run() { |
| 2955 | values.setAccessible(true); |
| 2956 | return null; |
| 2957 | } |
| 2958 | }); |
| 2959 | enumConstants = (T[])values.invoke(null); |
| 2960 | } |
| 2961 | // These can happen when users concoct enum-like classes |
| 2962 | // that don't comply with the enum spec. |
| 2963 | catch (InvocationTargetException ex) { return null; } |
| 2964 | catch (NoSuchMethodException ex) { return null; } |
| 2965 | catch (IllegalAccessException ex) { return null; } |
| 2966 | } |
| 2967 | return enumConstants; |
| 2968 | } |
| 2969 | private volatile transient T[] enumConstants = null; |
| 2970 | |
| 2971 | /** |
| 2972 | * Returns a map from simple name to enum constant. This package-private |
| 2973 | * method is used internally by Enum to implement |
| 2974 | * public static <T extends Enum<T>> T valueOf(Class<T>, String) |
| 2975 | * efficiently. Note that the map is returned by this method is |
| 2976 | * created lazily on first use. Typically it won't ever get created. |
| 2977 | */ |
| 2978 | Map<String, T> enumConstantDirectory() { |
| 2979 | if (enumConstantDirectory == null) { |
| 2980 | T[] universe = getEnumConstantsShared(); |
| 2981 | if (universe == null) |
| 2982 | throw new IllegalArgumentException( |
| 2983 | getName() + " is not an enum type"); |
| 2984 | Map<String, T> m = new HashMap<String, T>(2 * universe.length); |
| 2985 | for (T constant : universe) |
| 2986 | m.put(((Enum)constant).name(), constant); |
| 2987 | enumConstantDirectory = m; |
| 2988 | } |
| 2989 | return enumConstantDirectory; |
| 2990 | } |
| 2991 | private volatile transient Map<String, T> enumConstantDirectory = null; |
| 2992 | |
| 2993 | /** |
| 2994 | * Casts an object to the class or interface represented |
| 2995 | * by this {@code Class} object. |
| 2996 | * |
| 2997 | * @param obj the object to be cast |
| 2998 | * @return the object after casting, or null if obj is null |
| 2999 | * |
| 3000 | * @throws ClassCastException if the object is not |
| 3001 | * null and is not assignable to the type T. |
| 3002 | * |
| 3003 | * @since 1.5 |
| 3004 | */ |
| 3005 | public T cast(Object obj) { |
| 3006 | if (obj != null && !isInstance(obj)) |
| 3007 | throw new ClassCastException(cannotCastMsg(obj)); |
| 3008 | return (T) obj; |
| 3009 | } |
| 3010 | |
| 3011 | private String cannotCastMsg(Object obj) { |
| 3012 | return "Cannot cast " + obj.getClass().getName() + " to " + getName(); |
| 3013 | } |
| 3014 | |
| 3015 | /** |
| 3016 | * Casts this {@code Class} object to represent a subclass of the class |
| 3017 | * represented by the specified class object. Checks that that the cast |
| 3018 | * is valid, and throws a {@code ClassCastException} if it is not. If |
| 3019 | * this method succeeds, it always returns a reference to this class object. |
| 3020 | * |
| 3021 | * <p>This method is useful when a client needs to "narrow" the type of |
| 3022 | * a {@code Class} object to pass it to an API that restricts the |
| 3023 | * {@code Class} objects that it is willing to accept. A cast would |
| 3024 | * generate a compile-time warning, as the correctness of the cast |
| 3025 | * could not be checked at runtime (because generic types are implemented |
| 3026 | * by erasure). |
| 3027 | * |
| 3028 | * @return this {@code Class} object, cast to represent a subclass of |
| 3029 | * the specified class object. |
| 3030 | * @throws ClassCastException if this {@code Class} object does not |
| 3031 | * represent a subclass of the specified class (here "subclass" includes |
| 3032 | * the class itself). |
| 3033 | * @since 1.5 |
| 3034 | */ |
| 3035 | public <U> Class<? extends U> asSubclass(Class<U> clazz) { |
| 3036 | if (clazz.isAssignableFrom(this)) |
| 3037 | return (Class<? extends U>) this; |
| 3038 | else |
| 3039 | throw new ClassCastException(this.toString()); |
| 3040 | } |
| 3041 | |
| 3042 | /** |
| 3043 | * @throws NullPointerException {@inheritDoc} |
| 3044 | * @since 1.5 |
| 3045 | */ |
| 3046 | public <A extends Annotation> A getAnnotation(Class<A> annotationClass) { |
| 3047 | if (annotationClass == null) |
| 3048 | throw new NullPointerException(); |
| 3049 | |
| 3050 | initAnnotationsIfNecessary(); |
| 3051 | return (A) annotations.get(annotationClass); |
| 3052 | } |
| 3053 | |
| 3054 | /** |
| 3055 | * @throws NullPointerException {@inheritDoc} |
| 3056 | * @since 1.5 |
| 3057 | */ |
| 3058 | public boolean isAnnotationPresent( |
| 3059 | Class<? extends Annotation> annotationClass) { |
| 3060 | if (annotationClass == null) |
| 3061 | throw new NullPointerException(); |
| 3062 | |
| 3063 | return getAnnotation(annotationClass) != null; |
| 3064 | } |
| 3065 | |
| 3066 | |
| 3067 | private static Annotation[] EMPTY_ANNOTATIONS_ARRAY = new Annotation[0]; |
| 3068 | |
| 3069 | /** |
| 3070 | * @since 1.5 |
| 3071 | */ |
| 3072 | public Annotation[] getAnnotations() { |
| 3073 | initAnnotationsIfNecessary(); |
| 3074 | return annotations.values().toArray(EMPTY_ANNOTATIONS_ARRAY); |
| 3075 | } |
| 3076 | |
| 3077 | /** |
| 3078 | * @since 1.5 |
| 3079 | */ |
| 3080 | public Annotation[] getDeclaredAnnotations() { |
| 3081 | initAnnotationsIfNecessary(); |
| 3082 | return declaredAnnotations.values().toArray(EMPTY_ANNOTATIONS_ARRAY); |
| 3083 | } |
| 3084 | |
| 3085 | // Annotations cache |
| 3086 | private transient Map<Class, Annotation> annotations; |
| 3087 | private transient Map<Class, Annotation> declaredAnnotations; |
| 3088 | |
| 3089 | private synchronized void initAnnotationsIfNecessary() { |
| 3090 | clearCachesOnClassRedefinition(); |
| 3091 | if (annotations != null) |
| 3092 | return; |
| 3093 | declaredAnnotations = AnnotationParser.parseAnnotations( |
| 3094 | getRawAnnotations(), getConstantPool(), this); |
| 3095 | Class<?> superClass = getSuperclass(); |
| 3096 | if (superClass == null) { |
| 3097 | annotations = declaredAnnotations; |
| 3098 | } else { |
| 3099 | annotations = new HashMap<Class, Annotation>(); |
| 3100 | superClass.initAnnotationsIfNecessary(); |
| 3101 | for (Map.Entry<Class, Annotation> e : superClass.annotations.entrySet()) { |
| 3102 | Class annotationClass = e.getKey(); |
| 3103 | if (AnnotationType.getInstance(annotationClass).isInherited()) |
| 3104 | annotations.put(annotationClass, e.getValue()); |
| 3105 | } |
| 3106 | annotations.putAll(declaredAnnotations); |
| 3107 | } |
| 3108 | } |
| 3109 | |
| 3110 | // Annotation types cache their internal (AnnotationType) form |
| 3111 | |
| 3112 | private AnnotationType annotationType; |
| 3113 | |
| 3114 | void setAnnotationType(AnnotationType type) { |
| 3115 | annotationType = type; |
| 3116 | } |
| 3117 | |
| 3118 | AnnotationType getAnnotationType() { |
| 3119 | return annotationType; |
| 3120 | } |
| 3121 | } |