1 /*
2 * Copyright (c) 1994, 2013, Oracle and/or its affiliates. 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang;
27
28 import java.lang.reflect.AnnotatedElement;
29 import java.lang.reflect.Array;
30 import java.lang.reflect.GenericArrayType;
31 import java.lang.reflect.GenericDeclaration;
32 import java.lang.reflect.Member;
33 import java.lang.reflect.Field;
34 import java.lang.reflect.Executable;
35 import java.lang.reflect.Method;
36 import java.lang.reflect.Constructor;
37 import java.lang.reflect.Modifier;
38 import java.lang.reflect.Type;
39 import java.lang.reflect.TypeVariable;
40 import java.lang.reflect.InvocationTargetException;
41 import java.lang.reflect.AnnotatedType;
42 import java.lang.ref.SoftReference;
43 import java.io.InputStream;
44 import java.io.ObjectStreamField;
45 import java.security.AccessController;
46 import java.security.PrivilegedAction;
47 import java.util.ArrayList;
48 import java.util.Arrays;
49 import java.util.Collection;
50 import java.util.HashSet;
51 import java.util.LinkedHashMap;
52 import java.util.List;
53 import java.util.Set;
54 import java.util.Map;
55 import java.util.HashMap;
56 import java.util.Objects;
57 import sun.misc.Unsafe;
58 import sun.reflect.CallerSensitive;
59 import sun.reflect.ConstantPool;
60 import sun.reflect.Reflection;
61 import sun.reflect.ReflectionFactory;
62 import sun.reflect.generics.factory.CoreReflectionFactory;
63 import sun.reflect.generics.factory.GenericsFactory;
64 import sun.reflect.generics.repository.ClassRepository;
65 import sun.reflect.generics.repository.MethodRepository;
66 import sun.reflect.generics.repository.ConstructorRepository;
67 import sun.reflect.generics.scope.ClassScope;
68 import sun.security.util.SecurityConstants;
69 import java.lang.annotation.Annotation;
70 import java.lang.reflect.Proxy;
71 import sun.reflect.annotation.*;
72 import sun.reflect.misc.ReflectUtil;
73
74 /**
75 * Instances of the class {@code Class} represent classes and
76 * interfaces in a running Java application. An enum is a kind of
77 * class and an annotation is a kind of interface. Every array also
78 * belongs to a class that is reflected as a {@code Class} object
79 * that is shared by all arrays with the same element type and number
80 * of dimensions. The primitive Java types ({@code boolean},
81 * {@code byte}, {@code char}, {@code short},
82 * {@code int}, {@code long}, {@code float}, and
83 * {@code double}), and the keyword {@code void} are also
84 * represented as {@code Class} objects.
85 *
86 * <p> {@code Class} has no public constructor. Instead {@code Class}
87 * objects are constructed automatically by the Java Virtual Machine as classes
88 * are loaded and by calls to the {@code defineClass} method in the class
89 * loader.
90 *
91 * <p> The following example uses a {@code Class} object to print the
92 * class name of an object:
93 *
94 * <p> <blockquote><pre>
95 * void printClassName(Object obj) {
96 * System.out.println("The class of " + obj +
97 * " is " + obj.getClass().getName());
98 * }
99 * </pre></blockquote>
100 *
101 * <p> It is also possible to get the {@code Class} object for a named
102 * type (or for void) using a class literal. See Section 15.8.2 of
103 * <cite>The Java™ Language Specification</cite>.
104 * For example:
105 *
106 * <p> <blockquote>
107 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
108 * </blockquote>
109 *
110 * @param <T> the type of the class modeled by this {@code Class}
111 * object. For example, the type of {@code String.class} is {@code
112 * Class<String>}. Use {@code Class<?>} if the class being modeled is
113 * unknown.
114 *
115 * @author unascribed
116 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
117 * @since JDK1.0
118 */
119 public final class Class<T> implements java.io.Serializable,
120 GenericDeclaration,
121 Type,
122 AnnotatedElement {
123 private static final int ANNOTATION= 0x00002000;
124 private static final int ENUM = 0x00004000;
125 private static final int SYNTHETIC = 0x00001000;
126
127 private static native void registerNatives();
128 static {
129 registerNatives();
130 }
131
132 /*
133 * Constructor. Only the Java Virtual Machine creates Class
134 * objects.
135 */
136 private Class() {}
137
138
139 /**
140 * Converts the object to a string. The string representation is the
141 * string "class" or "interface", followed by a space, and then by the
142 * fully qualified name of the class in the format returned by
143 * {@code getName}. If this {@code Class} object represents a
144 * primitive type, this method returns the name of the primitive type. If
145 * this {@code Class} object represents void this method returns
146 * "void".
147 *
148 * @return a string representation of this class object.
149 */
150 public String toString() {
151 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
152 + getName();
153 }
154
155 /**
156 * Returns a string describing this {@code Class}, including
157 * information about modifiers and type parameters.
158 *
159 * The string is formatted as a list of type modifiers, if any,
160 * followed by the kind of type (empty string for primitive types
161 * and {@code class}, {@code enum}, {@code interface}, or
162 * <code>@</code>{@code interface}, as appropriate), followed
163 * by the type's name, followed by an angle-bracketed
164 * comma-separated list of the type's type parameters, if any.
165 *
166 * A space is used to separate modifiers from one another and to
167 * separate any modifiers from the kind of type. The modifiers
168 * occur in canonical order. If there are no type parameters, the
169 * type parameter list is elided.
170 *
171 * <p>Note that since information about the runtime representation
172 * of a type is being generated, modifiers not present on the
173 * originating source code or illegal on the originating source
174 * code may be present.
175 *
176 * @return a string describing this {@code Class}, including
177 * information about modifiers and type parameters
178 *
179 * @since 1.8
180 */
181 public String toGenericString() {
182 if (isPrimitive()) {
183 return toString();
184 } else {
185 StringBuilder sb = new StringBuilder();
186
187 // Class modifiers are a superset of interface modifiers
188 int modifiers = getModifiers() & Modifier.classModifiers();
189 if (modifiers != 0) {
190 sb.append(Modifier.toString(modifiers));
191 sb.append(' ');
192 }
193
194 if (isAnnotation()) {
195 sb.append('@');
196 }
197 if (isInterface()) { // Note: all annotation types are interfaces
198 sb.append("interface");
199 } else {
200 if (isEnum())
201 sb.append("enum");
202 else
203 sb.append("class");
204 }
205 sb.append(' ');
206 sb.append(getName());
207
208 TypeVariable<?>[] typeparms = getTypeParameters();
209 if (typeparms.length > 0) {
210 boolean first = true;
211 sb.append('<');
212 for(TypeVariable<?> typeparm: typeparms) {
213 if (!first)
214 sb.append(',');
215 sb.append(typeparm.getTypeName());
216 first = false;
217 }
218 sb.append('>');
219 }
220
221 return sb.toString();
222 }
223 }
224
225 /**
226 * Returns the {@code Class} object associated with the class or
227 * interface with the given string name. Invoking this method is
228 * equivalent to:
229 *
230 * <blockquote>
231 * {@code Class.forName(className, true, currentLoader)}
232 * </blockquote>
233 *
234 * where {@code currentLoader} denotes the defining class loader of
235 * the current class.
236 *
237 * <p> For example, the following code fragment returns the
238 * runtime {@code Class} descriptor for the class named
239 * {@code java.lang.Thread}:
240 *
241 * <blockquote>
242 * {@code Class t = Class.forName("java.lang.Thread")}
243 * </blockquote>
244 * <p>
245 * A call to {@code forName("X")} causes the class named
246 * {@code X} to be initialized.
247 *
248 * @param className the fully qualified name of the desired class.
249 * @return the {@code Class} object for the class with the
250 * specified name.
251 * @exception LinkageError if the linkage fails
252 * @exception ExceptionInInitializerError if the initialization provoked
253 * by this method fails
254 * @exception ClassNotFoundException if the class cannot be located
255 */
256 @CallerSensitive
257 public static Class<?> forName(String className)
258 throws ClassNotFoundException {
259 return forName0(className, true,
260 ClassLoader.getClassLoader(Reflection.getCallerClass()));
261 }
262
263
264 /**
265 * Returns the {@code Class} object associated with the class or
266 * interface with the given string name, using the given class loader.
267 * Given the fully qualified name for a class or interface (in the same
268 * format returned by {@code getName}) this method attempts to
269 * locate, load, and link the class or interface. The specified class
270 * loader is used to load the class or interface. If the parameter
271 * {@code loader} is null, the class is loaded through the bootstrap
272 * class loader. The class is initialized only if the
273 * {@code initialize} parameter is {@code true} and if it has
274 * not been initialized earlier.
275 *
276 * <p> If {@code name} denotes a primitive type or void, an attempt
277 * will be made to locate a user-defined class in the unnamed package whose
278 * name is {@code name}. Therefore, this method cannot be used to
279 * obtain any of the {@code Class} objects representing primitive
280 * types or void.
281 *
282 * <p> If {@code name} denotes an array class, the component type of
283 * the array class is loaded but not initialized.
284 *
285 * <p> For example, in an instance method the expression:
286 *
287 * <blockquote>
288 * {@code Class.forName("Foo")}
289 * </blockquote>
290 *
291 * is equivalent to:
292 *
293 * <blockquote>
294 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
295 * </blockquote>
296 *
297 * Note that this method throws errors related to loading, linking or
298 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
299 * Java Language Specification</em>.
300 * Note that this method does not check whether the requested class
301 * is accessible to its caller.
302 *
303 * <p> If the {@code loader} is {@code null}, and a security
304 * manager is present, and the caller's class loader is not null, then this
305 * method calls the security manager's {@code checkPermission} method
306 * with a {@code RuntimePermission("getClassLoader")} permission to
307 * ensure it's ok to access the bootstrap class loader.
308 *
309 * @param name fully qualified name of the desired class
310 * @param initialize if {@code true} the class will be initialized.
311 * See Section 12.4 of <em>The Java Language Specification</em>.
312 * @param loader class loader from which the class must be loaded
313 * @return class object representing the desired class
314 *
315 * @exception LinkageError if the linkage fails
316 * @exception ExceptionInInitializerError if the initialization provoked
317 * by this method fails
318 * @exception ClassNotFoundException if the class cannot be located by
319 * the specified class loader
320 *
321 * @see java.lang.Class#forName(String)
322 * @see java.lang.ClassLoader
323 * @since 1.2
324 */
325 @CallerSensitive
326 public static Class<?> forName(String name, boolean initialize,
327 ClassLoader loader)
328 throws ClassNotFoundException
329 {
330 if (sun.misc.VM.isSystemDomainLoader(loader)) {
331 SecurityManager sm = System.getSecurityManager();
332 if (sm != null) {
333 ClassLoader ccl = ClassLoader.getClassLoader(Reflection.getCallerClass());
334 if (!sun.misc.VM.isSystemDomainLoader(ccl)) {
335 sm.checkPermission(
336 SecurityConstants.GET_CLASSLOADER_PERMISSION);
337 }
338 }
339 }
340 return forName0(name, initialize, loader);
341 }
342
343 /** Called after security checks have been made. */
344 private static native Class<?> forName0(String name, boolean initialize,
345 ClassLoader loader)
346 throws ClassNotFoundException;
347
348 /**
349 * Creates a new instance of the class represented by this {@code Class}
350 * object. The class is instantiated as if by a {@code new}
351 * expression with an empty argument list. The class is initialized if it
352 * has not already been initialized.
353 *
354 * <p>Note that this method propagates any exception thrown by the
355 * nullary constructor, including a checked exception. Use of
356 * this method effectively bypasses the compile-time exception
357 * checking that would otherwise be performed by the compiler.
358 * The {@link
359 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
360 * Constructor.newInstance} method avoids this problem by wrapping
361 * any exception thrown by the constructor in a (checked) {@link
362 * java.lang.reflect.InvocationTargetException}.
363 *
364 * @return a newly allocated instance of the class represented by this
365 * object.
366 * @throws IllegalAccessException if the class or its nullary
367 * constructor is not accessible.
368 * @throws InstantiationException
369 * if this {@code Class} represents an abstract class,
370 * an interface, an array class, a primitive type, or void;
371 * or if the class has no nullary constructor;
372 * or if the instantiation fails for some other reason.
373 * @throws ExceptionInInitializerError if the initialization
374 * provoked by this method fails.
375 * @throws SecurityException
376 * If a security manager, <i>s</i>, is present and
377 * the caller's class loader is not the same as or an
378 * ancestor of the class loader for the current class and
379 * invocation of {@link SecurityManager#checkPackageAccess
380 * s.checkPackageAccess()} denies access to the package
381 * of this class.
382 */
383 @CallerSensitive
384 public T newInstance()
385 throws InstantiationException, IllegalAccessException
386 {
387 if (System.getSecurityManager() != null) {
388 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
389 }
390
391 // NOTE: the following code may not be strictly correct under
392 // the current Java memory model.
393
394 // Constructor lookup
395 if (cachedConstructor == null) {
396 if (this == Class.class) {
397 throw new IllegalAccessException(
398 "Can not call newInstance() on the Class for java.lang.Class"
399 );
400 }
401 try {
402 Class<?>[] empty = {};
403 final Constructor<T> c = getConstructor0(empty, Member.DECLARED);
404 // Disable accessibility checks on the constructor
405 // since we have to do the security check here anyway
406 // (the stack depth is wrong for the Constructor's
407 // security check to work)
408 java.security.AccessController.doPrivileged(
409 new java.security.PrivilegedAction<Void>() {
410 public Void run() {
411 c.setAccessible(true);
412 return null;
413 }
414 });
415 cachedConstructor = c;
416 } catch (NoSuchMethodException e) {
417 throw (InstantiationException)
418 new InstantiationException(getName()).initCause(e);
419 }
420 }
421 Constructor<T> tmpConstructor = cachedConstructor;
422 // Security check (same as in java.lang.reflect.Constructor)
423 int modifiers = tmpConstructor.getModifiers();
424 if (!Reflection.quickCheckMemberAccess(this, modifiers)) {
425 Class<?> caller = Reflection.getCallerClass();
426 if (newInstanceCallerCache != caller) {
427 Reflection.ensureMemberAccess(caller, this, null, modifiers);
428 newInstanceCallerCache = caller;
429 }
430 }
431 // Run constructor
432 try {
433 return tmpConstructor.newInstance((Object[])null);
434 } catch (InvocationTargetException e) {
435 Unsafe.getUnsafe().throwException(e.getTargetException());
436 // Not reached
437 return null;
438 }
439 }
440 private volatile transient Constructor<T> cachedConstructor;
441 private volatile transient Class<?> newInstanceCallerCache;
442
443
444 /**
445 * Determines if the specified {@code Object} is assignment-compatible
446 * with the object represented by this {@code Class}. This method is
447 * the dynamic equivalent of the Java language {@code instanceof}
448 * operator. The method returns {@code true} if the specified
449 * {@code Object} argument is non-null and can be cast to the
450 * reference type represented by this {@code Class} object without
451 * raising a {@code ClassCastException.} It returns {@code false}
452 * otherwise.
453 *
454 * <p> Specifically, if this {@code Class} object represents a
455 * declared class, this method returns {@code true} if the specified
456 * {@code Object} argument is an instance of the represented class (or
457 * of any of its subclasses); it returns {@code false} otherwise. If
458 * this {@code Class} object represents an array class, this method
459 * returns {@code true} if the specified {@code Object} argument
460 * can be converted to an object of the array class by an identity
461 * conversion or by a widening reference conversion; it returns
462 * {@code false} otherwise. If this {@code Class} object
463 * represents an interface, this method returns {@code true} if the
464 * class or any superclass of the specified {@code Object} argument
465 * implements this interface; it returns {@code false} otherwise. If
466 * this {@code Class} object represents a primitive type, this method
467 * returns {@code false}.
468 *
469 * @param obj the object to check
470 * @return true if {@code obj} is an instance of this class
471 *
472 * @since JDK1.1
473 */
474 public native boolean isInstance(Object obj);
475
476
477 /**
478 * Determines if the class or interface represented by this
479 * {@code Class} object is either the same as, or is a superclass or
480 * superinterface of, the class or interface represented by the specified
481 * {@code Class} parameter. It returns {@code true} if so;
482 * otherwise it returns {@code false}. If this {@code Class}
483 * object represents a primitive type, this method returns
484 * {@code true} if the specified {@code Class} parameter is
485 * exactly this {@code Class} object; otherwise it returns
486 * {@code false}.
487 *
488 * <p> Specifically, this method tests whether the type represented by the
489 * specified {@code Class} parameter can be converted to the type
490 * represented by this {@code Class} object via an identity conversion
491 * or via a widening reference conversion. See <em>The Java Language
492 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
493 *
494 * @param cls the {@code Class} object to be checked
495 * @return the {@code boolean} value indicating whether objects of the
496 * type {@code cls} can be assigned to objects of this class
497 * @exception NullPointerException if the specified Class parameter is
498 * null.
499 * @since JDK1.1
500 */
501 public native boolean isAssignableFrom(Class<?> cls);
502
503
504 /**
505 * Determines if the specified {@code Class} object represents an
506 * interface type.
507 *
508 * @return {@code true} if this object represents an interface;
509 * {@code false} otherwise.
510 */
511 public native boolean isInterface();
512
513
514 /**
515 * Determines if this {@code Class} object represents an array class.
516 *
517 * @return {@code true} if this object represents an array class;
518 * {@code false} otherwise.
519 * @since JDK1.1
520 */
521 public native boolean isArray();
522
523
524 /**
525 * Determines if the specified {@code Class} object represents a
526 * primitive type.
527 *
528 * <p> There are nine predefined {@code Class} objects to represent
529 * the eight primitive types and void. These are created by the Java
530 * Virtual Machine, and have the same names as the primitive types that
531 * they represent, namely {@code boolean}, {@code byte},
532 * {@code char}, {@code short}, {@code int},
533 * {@code long}, {@code float}, and {@code double}.
534 *
535 * <p> These objects may only be accessed via the following public static
536 * final variables, and are the only {@code Class} objects for which
537 * this method returns {@code true}.
538 *
539 * @return true if and only if this class represents a primitive type
540 *
541 * @see java.lang.Boolean#TYPE
542 * @see java.lang.Character#TYPE
543 * @see java.lang.Byte#TYPE
544 * @see java.lang.Short#TYPE
545 * @see java.lang.Integer#TYPE
546 * @see java.lang.Long#TYPE
547 * @see java.lang.Float#TYPE
548 * @see java.lang.Double#TYPE
549 * @see java.lang.Void#TYPE
550 * @since JDK1.1
551 */
552 public native boolean isPrimitive();
553
554 /**
555 * Returns true if this {@code Class} object represents an annotation
556 * type. Note that if this method returns true, {@link #isInterface()}
557 * would also return true, as all annotation types are also interfaces.
558 *
559 * @return {@code true} if this class object represents an annotation
560 * type; {@code false} otherwise
561 * @since 1.5
562 */
563 public boolean isAnnotation() {
564 return (getModifiers() & ANNOTATION) != 0;
565 }
566
567 /**
568 * Returns {@code true} if this class is a synthetic class;
569 * returns {@code false} otherwise.
570 * @return {@code true} if and only if this class is a synthetic class as
571 * defined by the Java Language Specification.
572 * @jls 13.1 The Form of a Binary
573 * @since 1.5
574 */
575 public boolean isSynthetic() {
576 return (getModifiers() & SYNTHETIC) != 0;
577 }
578
579 /**
580 * Returns the name of the entity (class, interface, array class,
581 * primitive type, or void) represented by this {@code Class} object,
582 * as a {@code String}.
583 *
584 * <p> If this class object represents a reference type that is not an
585 * array type then the binary name of the class is returned, as specified
586 * by
587 * <cite>The Java™ Language Specification</cite>.
588 *
589 * <p> If this class object represents a primitive type or void, then the
590 * name returned is a {@code String} equal to the Java language
591 * keyword corresponding to the primitive type or void.
592 *
593 * <p> If this class object represents a class of arrays, then the internal
594 * form of the name consists of the name of the element type preceded by
595 * one or more '{@code [}' characters representing the depth of the array
596 * nesting. The encoding of element type names is as follows:
597 *
598 * <blockquote><table summary="Element types and encodings">
599 * <tr><th> Element Type <th> <th> Encoding
600 * <tr><td> boolean <td> <td align=center> Z
601 * <tr><td> byte <td> <td align=center> B
602 * <tr><td> char <td> <td align=center> C
603 * <tr><td> class or interface
604 * <td> <td align=center> L<i>classname</i>;
605 * <tr><td> double <td> <td align=center> D
606 * <tr><td> float <td> <td align=center> F
607 * <tr><td> int <td> <td align=center> I
608 * <tr><td> long <td> <td align=center> J
609 * <tr><td> short <td> <td align=center> S
610 * </table></blockquote>
611 *
612 * <p> The class or interface name <i>classname</i> is the binary name of
613 * the class specified above.
614 *
615 * <p> Examples:
616 * <blockquote><pre>
617 * String.class.getName()
618 * returns "java.lang.String"
619 * byte.class.getName()
620 * returns "byte"
621 * (new Object[3]).getClass().getName()
622 * returns "[Ljava.lang.Object;"
623 * (new int[3][4][5][6][7][8][9]).getClass().getName()
624 * returns "[[[[[[[I"
625 * </pre></blockquote>
626 *
627 * @return the name of the class or interface
628 * represented by this object.
629 */
630 public String getName() {
631 String name = this.name;
632 if (name == null)
633 this.name = name = getName0();
634 return name;
635 }
636
637 // cache the name to reduce the number of calls into the VM
638 private transient String name;
639 private native String getName0();
640
641 /**
642 * Returns the class loader for the class. Some implementations may use
643 * null to represent the bootstrap class loader. This method will return
644 * null in such implementations if this class was loaded by the bootstrap
645 * class loader.
646 *
647 * <p> If a security manager is present, and the caller's class loader is
648 * not null and the caller's class loader is not the same as or an ancestor of
649 * the class loader for the class whose class loader is requested, then
650 * this method calls the security manager's {@code checkPermission}
651 * method with a {@code RuntimePermission("getClassLoader")}
652 * permission to ensure it's ok to access the class loader for the class.
653 *
654 * <p>If this object
655 * represents a primitive type or void, null is returned.
656 *
657 * @return the class loader that loaded the class or interface
658 * represented by this object.
659 * @throws SecurityException
660 * if a security manager exists and its
661 * {@code checkPermission} method denies
662 * access to the class loader for the class.
663 * @see java.lang.ClassLoader
664 * @see SecurityManager#checkPermission
665 * @see java.lang.RuntimePermission
666 */
667 @CallerSensitive
668 public ClassLoader getClassLoader() {
669 ClassLoader cl = getClassLoader0();
670 if (cl == null)
671 return null;
672 SecurityManager sm = System.getSecurityManager();
673 if (sm != null) {
674 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
675 }
676 return cl;
677 }
678
679 // Package-private to allow ClassLoader access
680 native ClassLoader getClassLoader0();
681
682
683 /**
684 * Returns an array of {@code TypeVariable} objects that represent the
685 * type variables declared by the generic declaration represented by this
686 * {@code GenericDeclaration} object, in declaration order. Returns an
687 * array of length 0 if the underlying generic declaration declares no type
688 * variables.
689 *
690 * @return an array of {@code TypeVariable} objects that represent
691 * the type variables declared by this generic declaration
692 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
693 * signature of this generic declaration does not conform to
694 * the format specified in
695 * <cite>The Java™ Virtual Machine Specification</cite>
696 * @since 1.5
697 */
698 @SuppressWarnings("unchecked")
699 public TypeVariable<Class<T>>[] getTypeParameters() {
700 ClassRepository info = getGenericInfo();
701 if (info != null)
702 return (TypeVariable<Class<T>>[])info.getTypeParameters();
703 else
704 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
705 }
706
707
708 /**
709 * Returns the {@code Class} representing the superclass of the entity
710 * (class, interface, primitive type or void) represented by this
711 * {@code Class}. If this {@code Class} represents either the
712 * {@code Object} class, an interface, a primitive type, or void, then
713 * null is returned. If this object represents an array class then the
714 * {@code Class} object representing the {@code Object} class is
715 * returned.
716 *
717 * @return the superclass of the class represented by this object.
718 */
719 public native Class<? super T> getSuperclass();
720
721
722 /**
723 * Returns the {@code Type} representing the direct superclass of
724 * the entity (class, interface, primitive type or void) represented by
725 * this {@code Class}.
726 *
727 * <p>If the superclass is a parameterized type, the {@code Type}
728 * object returned must accurately reflect the actual type
729 * parameters used in the source code. The parameterized type
730 * representing the superclass is created if it had not been
731 * created before. See the declaration of {@link
732 * java.lang.reflect.ParameterizedType ParameterizedType} for the
733 * semantics of the creation process for parameterized types. If
734 * this {@code Class} represents either the {@code Object}
735 * class, an interface, a primitive type, or void, then null is
736 * returned. If this object represents an array class then the
737 * {@code Class} object representing the {@code Object} class is
738 * returned.
739 *
740 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
741 * class signature does not conform to the format specified in
742 * <cite>The Java™ Virtual Machine Specification</cite>
743 * @throws TypeNotPresentException if the generic superclass
744 * refers to a non-existent type declaration
745 * @throws java.lang.reflect.MalformedParameterizedTypeException if the
746 * generic superclass refers to a parameterized type that cannot be
747 * instantiated for any reason
748 * @return the superclass of the class represented by this object
749 * @since 1.5
750 */
751 public Type getGenericSuperclass() {
752 ClassRepository info = getGenericInfo();
753 if (info == null) {
754 return getSuperclass();
755 }
756
757 // Historical irregularity:
758 // Generic signature marks interfaces with superclass = Object
759 // but this API returns null for interfaces
760 if (isInterface()) {
761 return null;
762 }
763
764 return info.getSuperclass();
765 }
766
767 /**
768 * Gets the package for this class. The class loader of this class is used
769 * to find the package. If the class was loaded by the bootstrap class
770 * loader the set of packages loaded from CLASSPATH is searched to find the
771 * package of the class. Null is returned if no package object was created
772 * by the class loader of this class.
773 *
774 * <p> Packages have attributes for versions and specifications only if the
775 * information was defined in the manifests that accompany the classes, and
776 * if the class loader created the package instance with the attributes
777 * from the manifest.
778 *
779 * @return the package of the class, or null if no package
780 * information is available from the archive or codebase.
781 */
782 public Package getPackage() {
783 return Package.getPackage(this);
784 }
785
786
787 /**
788 * Determines the interfaces implemented by the class or interface
789 * represented by this object.
790 *
791 * <p> If this object represents a class, the return value is an array
792 * containing objects representing all interfaces implemented by the
793 * class. The order of the interface objects in the array corresponds to
794 * the order of the interface names in the {@code implements} clause
795 * of the declaration of the class represented by this object. For
796 * example, given the declaration:
797 * <blockquote>
798 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
799 * </blockquote>
800 * suppose the value of {@code s} is an instance of
801 * {@code Shimmer}; the value of the expression:
802 * <blockquote>
803 * {@code s.getClass().getInterfaces()[0]}
804 * </blockquote>
805 * is the {@code Class} object that represents interface
806 * {@code FloorWax}; and the value of:
807 * <blockquote>
808 * {@code s.getClass().getInterfaces()[1]}
809 * </blockquote>
810 * is the {@code Class} object that represents interface
811 * {@code DessertTopping}.
812 *
813 * <p> If this object represents an interface, the array contains objects
814 * representing all interfaces extended by the interface. The order of the
815 * interface objects in the array corresponds to the order of the interface
816 * names in the {@code extends} clause of the declaration of the
817 * interface represented by this object.
818 *
819 * <p> If this object represents a class or interface that implements no
820 * interfaces, the method returns an array of length 0.
821 *
822 * <p> If this object represents a primitive type or void, the method
823 * returns an array of length 0.
824 *
825 * <p> If this {@code Class} object represents an array type, the
826 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
827 * returned in that order.
828 *
829 * @return an array of interfaces implemented by this class.
830 */
831 public Class<?>[] getInterfaces() {
832 ReflectionData<T> rd = reflectionData();
833 if (rd == null) {
834 // no cloning required
835 return getInterfaces0();
836 } else {
837 Class<?>[] interfaces = rd.interfaces;
838 if (interfaces == null) {
839 interfaces = getInterfaces0();
840 rd.interfaces = interfaces;
841 }
842 // defensively copy before handing over to user code
843 return interfaces.clone();
844 }
845 }
846
847 private native Class<?>[] getInterfaces0();
848
849 /**
850 * Returns the {@code Type}s representing the interfaces
851 * directly implemented by the class or interface represented by
852 * this object.
853 *
854 * <p>If a superinterface is a parameterized type, the
855 * {@code Type} object returned for it must accurately reflect
856 * the actual type parameters used in the source code. The
857 * parameterized type representing each superinterface is created
858 * if it had not been created before. See the declaration of
859 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
860 * for the semantics of the creation process for parameterized
861 * types.
862 *
863 * <p> If this object represents a class, the return value is an
864 * array containing objects representing all interfaces
865 * implemented by the class. The order of the interface objects in
866 * the array corresponds to the order of the interface names in
867 * the {@code implements} clause of the declaration of the class
868 * represented by this object. In the case of an array class, the
869 * interfaces {@code Cloneable} and {@code Serializable} are
870 * returned in that order.
871 *
872 * <p>If this object represents an interface, the array contains
873 * objects representing all interfaces directly extended by the
874 * interface. The order of the interface objects in the array
875 * corresponds to the order of the interface names in the
876 * {@code extends} clause of the declaration of the interface
877 * represented by this object.
878 *
879 * <p>If this object represents a class or interface that
880 * implements no interfaces, the method returns an array of length
881 * 0.
882 *
883 * <p>If this object represents a primitive type or void, the
884 * method returns an array of length 0.
885 *
886 * @throws java.lang.reflect.GenericSignatureFormatError
887 * if the generic class signature does not conform to the format
888 * specified in
889 * <cite>The Java™ Virtual Machine Specification</cite>
890 * @throws TypeNotPresentException if any of the generic
891 * superinterfaces refers to a non-existent type declaration
892 * @throws java.lang.reflect.MalformedParameterizedTypeException
893 * if any of the generic superinterfaces refer to a parameterized
894 * type that cannot be instantiated for any reason
895 * @return an array of interfaces implemented by this class
896 * @since 1.5
897 */
898 public Type[] getGenericInterfaces() {
899 ClassRepository info = getGenericInfo();
900 return (info == null) ? getInterfaces() : info.getSuperInterfaces();
901 }
902
903
904 /**
905 * Returns the {@code Class} representing the component type of an
906 * array. If this class does not represent an array class this method
907 * returns null.
908 *
909 * @return the {@code Class} representing the component type of this
910 * class if this class is an array
911 * @see java.lang.reflect.Array
912 * @since JDK1.1
913 */
914 public native Class<?> getComponentType();
915
916
917 /**
918 * Returns the Java language modifiers for this class or interface, encoded
919 * in an integer. The modifiers consist of the Java Virtual Machine's
920 * constants for {@code public}, {@code protected},
921 * {@code private}, {@code final}, {@code static},
922 * {@code abstract} and {@code interface}; they should be decoded
923 * using the methods of class {@code Modifier}.
924 *
925 * <p> If the underlying class is an array class, then its
926 * {@code public}, {@code private} and {@code protected}
927 * modifiers are the same as those of its component type. If this
928 * {@code Class} represents a primitive type or void, its
929 * {@code public} modifier is always {@code true}, and its
930 * {@code protected} and {@code private} modifiers are always
931 * {@code false}. If this object represents an array class, a
932 * primitive type or void, then its {@code final} modifier is always
933 * {@code true} and its interface modifier is always
934 * {@code false}. The values of its other modifiers are not determined
935 * by this specification.
936 *
937 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
938 * Specification</em>, table 4.1.
939 *
940 * @return the {@code int} representing the modifiers for this class
941 * @see java.lang.reflect.Modifier
942 * @since JDK1.1
943 */
944 public native int getModifiers();
945
946
947 /**
948 * Gets the signers of this class.
949 *
950 * @return the signers of this class, or null if there are no signers. In
951 * particular, this method returns null if this object represents
952 * a primitive type or void.
953 * @since JDK1.1
954 */
955 public native Object[] getSigners();
956
957
958 /**
959 * Set the signers of this class.
960 */
961 native void setSigners(Object[] signers);
962
963
964 /**
965 * If this {@code Class} object represents a local or anonymous
966 * class within a method, returns a {@link
967 * java.lang.reflect.Method Method} object representing the
968 * immediately enclosing method of the underlying class. Returns
969 * {@code null} otherwise.
970 *
971 * In particular, this method returns {@code null} if the underlying
972 * class is a local or anonymous class immediately enclosed by a type
973 * declaration, instance initializer or static initializer.
974 *
975 * @return the immediately enclosing method of the underlying class, if
976 * that class is a local or anonymous class; otherwise {@code null}.
977 *
978 * @throws SecurityException
979 * If a security manager, <i>s</i>, is present and any of the
980 * following conditions is met:
981 *
982 * <ul>
983 *
984 * <li> the caller's class loader is not the same as the
985 * class loader of the enclosing class and invocation of
986 * {@link SecurityManager#checkPermission
987 * s.checkPermission} method with
988 * {@code RuntimePermission("accessDeclaredMembers")}
989 * denies access to the methods within the enclosing class
990 *
991 * <li> the caller's class loader is not the same as or an
992 * ancestor of the class loader for the enclosing class and
993 * invocation of {@link SecurityManager#checkPackageAccess
994 * s.checkPackageAccess()} denies access to the package
995 * of the enclosing class
996 *
997 * </ul>
998 * @since 1.5
999 */
1000 @CallerSensitive
1001 public Method getEnclosingMethod() throws SecurityException {
1002 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1003
1004 if (enclosingInfo == null)
1005 return null;
1006 else {
1007 if (!enclosingInfo.isMethod())
1008 return null;
1009
1010 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
1011 getFactory());
1012 Class<?> returnType = toClass(typeInfo.getReturnType());
1013 Type [] parameterTypes = typeInfo.getParameterTypes();
1014 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1015
1016 // Convert Types to Classes; returned types *should*
1017 // be class objects since the methodDescriptor's used
1018 // don't have generics information
1019 for(int i = 0; i < parameterClasses.length; i++)
1020 parameterClasses[i] = toClass(parameterTypes[i]);
1021
1022 // Perform access check
1023 Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1024 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1025 Reflection.getCallerClass(), true);
1026 /*
1027 * Loop over all declared methods; match method name,
1028 * number of and type of parameters, *and* return
1029 * type. Matching return type is also necessary
1030 * because of covariant returns, etc.
1031 */
1032 for(Method m: enclosingCandidate.getDeclaredMethods()) {
1033 if (m.getName().equals(enclosingInfo.getName()) ) {
1034 Class<?>[] candidateParamClasses = m.getParameterTypes();
1035 if (candidateParamClasses.length == parameterClasses.length) {
1036 boolean matches = true;
1037 for(int i = 0; i < candidateParamClasses.length; i++) {
1038 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1039 matches = false;
1040 break;
1041 }
1042 }
1043
1044 if (matches) { // finally, check return type
1045 if (m.getReturnType().equals(returnType) )
1046 return m;
1047 }
1048 }
1049 }
1050 }
1051
1052 throw new InternalError("Enclosing method not found");
1053 }
1054 }
1055
1056 private native Object[] getEnclosingMethod0();
1057
1058 private EnclosingMethodInfo getEnclosingMethodInfo() {
1059 Object[] enclosingInfo = getEnclosingMethod0();
1060 if (enclosingInfo == null)
1061 return null;
1062 else {
1063 return new EnclosingMethodInfo(enclosingInfo);
1064 }
1065 }
1066
1067 private final static class EnclosingMethodInfo {
1068 private Class<?> enclosingClass;
1069 private String name;
1070 private String descriptor;
1071
1072 private EnclosingMethodInfo(Object[] enclosingInfo) {
1073 if (enclosingInfo.length != 3)
1074 throw new InternalError("Malformed enclosing method information");
1075 try {
1076 // The array is expected to have three elements:
1077
1078 // the immediately enclosing class
1079 enclosingClass = (Class<?>) enclosingInfo[0];
1080 assert(enclosingClass != null);
1081
1082 // the immediately enclosing method or constructor's
1083 // name (can be null).
1084 name = (String) enclosingInfo[1];
1085
1086 // the immediately enclosing method or constructor's
1087 // descriptor (null iff name is).
1088 descriptor = (String) enclosingInfo[2];
1089 assert((name != null && descriptor != null) || name == descriptor);
1090 } catch (ClassCastException cce) {
1091 throw new InternalError("Invalid type in enclosing method information", cce);
1092 }
1093 }
1094
1095 boolean isPartial() {
1096 return enclosingClass == null || name == null || descriptor == null;
1097 }
1098
1099 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
1100
1101 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
1102
1103 Class<?> getEnclosingClass() { return enclosingClass; }
1104
1105 String getName() { return name; }
1106
1107 String getDescriptor() { return descriptor; }
1108
1109 }
1110
1111 private static Class<?> toClass(Type o) {
1112 if (o instanceof GenericArrayType)
1113 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1114 0)
1115 .getClass();
1116 return (Class<?>)o;
1117 }
1118
1119 /**
1120 * If this {@code Class} object represents a local or anonymous
1121 * class within a constructor, returns a {@link
1122 * java.lang.reflect.Constructor Constructor} object representing
1123 * the immediately enclosing constructor of the underlying
1124 * class. Returns {@code null} otherwise. In particular, this
1125 * method returns {@code null} if the underlying class is a local
1126 * or anonymous class immediately enclosed by a type declaration,
1127 * instance initializer or static initializer.
1128 *
1129 * @return the immediately enclosing constructor of the underlying class, if
1130 * that class is a local or anonymous class; otherwise {@code null}.
1131 * @throws SecurityException
1132 * If a security manager, <i>s</i>, is present and any of the
1133 * following conditions is met:
1134 *
1135 * <ul>
1136 *
1137 * <li> the caller's class loader is not the same as the
1138 * class loader of the enclosing class and invocation of
1139 * {@link SecurityManager#checkPermission
1140 * s.checkPermission} method with
1141 * {@code RuntimePermission("accessDeclaredMembers")}
1142 * denies access to the constructors within the enclosing class
1143 *
1144 * <li> the caller's class loader is not the same as or an
1145 * ancestor of the class loader for the enclosing class and
1146 * invocation of {@link SecurityManager#checkPackageAccess
1147 * s.checkPackageAccess()} denies access to the package
1148 * of the enclosing class
1149 *
1150 * </ul>
1151 * @since 1.5
1152 */
1153 @CallerSensitive
1154 public Constructor<?> getEnclosingConstructor() throws SecurityException {
1155 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1156
1157 if (enclosingInfo == null)
1158 return null;
1159 else {
1160 if (!enclosingInfo.isConstructor())
1161 return null;
1162
1163 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1164 getFactory());
1165 Type [] parameterTypes = typeInfo.getParameterTypes();
1166 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1167
1168 // Convert Types to Classes; returned types *should*
1169 // be class objects since the methodDescriptor's used
1170 // don't have generics information
1171 for(int i = 0; i < parameterClasses.length; i++)
1172 parameterClasses[i] = toClass(parameterTypes[i]);
1173
1174 // Perform access check
1175 Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1176 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1177 Reflection.getCallerClass(), true);
1178 /*
1179 * Loop over all declared constructors; match number
1180 * of and type of parameters.
1181 */
1182 for(Constructor<?> c: enclosingCandidate.getDeclaredConstructors()) {
1183 Class<?>[] candidateParamClasses = c.getParameterTypes();
1184 if (candidateParamClasses.length == parameterClasses.length) {
1185 boolean matches = true;
1186 for(int i = 0; i < candidateParamClasses.length; i++) {
1187 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1188 matches = false;
1189 break;
1190 }
1191 }
1192
1193 if (matches)
1194 return c;
1195 }
1196 }
1197
1198 throw new InternalError("Enclosing constructor not found");
1199 }
1200 }
1201
1202
1203 /**
1204 * If the class or interface represented by this {@code Class} object
1205 * is a member of another class, returns the {@code Class} object
1206 * representing the class in which it was declared. This method returns
1207 * null if this class or interface is not a member of any other class. If
1208 * this {@code Class} object represents an array class, a primitive
1209 * type, or void,then this method returns null.
1210 *
1211 * @return the declaring class for this class
1212 * @since JDK1.1
1213 */
1214 public native Class<?> getDeclaringClass();
1215
1216
1217 /**
1218 * Returns the immediately enclosing class of the underlying
1219 * class. If the underlying class is a top level class this
1220 * method returns {@code null}.
1221 * @return the immediately enclosing class of the underlying class
1222 * @exception SecurityException
1223 * If a security manager, <i>s</i>, is present and the caller's
1224 * class loader is not the same as or an ancestor of the class
1225 * loader for the enclosing class and invocation of {@link
1226 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1227 * denies access to the package of the enclosing class
1228 * @since 1.5
1229 */
1230 @CallerSensitive
1231 public Class<?> getEnclosingClass() throws SecurityException {
1232 // There are five kinds of classes (or interfaces):
1233 // a) Top level classes
1234 // b) Nested classes (static member classes)
1235 // c) Inner classes (non-static member classes)
1236 // d) Local classes (named classes declared within a method)
1237 // e) Anonymous classes
1238
1239
1240 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1241 // attribute if and only if it is a local class or an
1242 // anonymous class.
1243 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1244 Class<?> enclosingCandidate;
1245
1246 if (enclosingInfo == null) {
1247 // This is a top level or a nested class or an inner class (a, b, or c)
1248 enclosingCandidate = getDeclaringClass();
1249 } else {
1250 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1251 // This is a local class or an anonymous class (d or e)
1252 if (enclosingClass == this || enclosingClass == null)
1253 throw new InternalError("Malformed enclosing method information");
1254 else
1255 enclosingCandidate = enclosingClass;
1256 }
1257
1258 if (enclosingCandidate != null)
1259 enclosingCandidate.checkPackageAccess(
1260 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1261 return enclosingCandidate;
1262 }
1263
1264 /**
1265 * Returns the simple name of the underlying class as given in the
1266 * source code. Returns an empty string if the underlying class is
1267 * anonymous.
1268 *
1269 * <p>The simple name of an array is the simple name of the
1270 * component type with "[]" appended. In particular the simple
1271 * name of an array whose component type is anonymous is "[]".
1272 *
1273 * @return the simple name of the underlying class
1274 * @since 1.5
1275 */
1276 public String getSimpleName() {
1277 if (isArray())
1278 return getComponentType().getSimpleName()+"[]";
1279
1280 String simpleName = getSimpleBinaryName();
1281 if (simpleName == null) { // top level class
1282 simpleName = getName();
1283 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
1284 }
1285 // According to JLS3 "Binary Compatibility" (13.1) the binary
1286 // name of non-package classes (not top level) is the binary
1287 // name of the immediately enclosing class followed by a '$' followed by:
1288 // (for nested and inner classes): the simple name.
1289 // (for local classes): 1 or more digits followed by the simple name.
1290 // (for anonymous classes): 1 or more digits.
1291
1292 // Since getSimpleBinaryName() will strip the binary name of
1293 // the immediatly enclosing class, we are now looking at a
1294 // string that matches the regular expression "\$[0-9]*"
1295 // followed by a simple name (considering the simple of an
1296 // anonymous class to be the empty string).
1297
1298 // Remove leading "\$[0-9]*" from the name
1299 int length = simpleName.length();
1300 if (length < 1 || simpleName.charAt(0) != '$')
1301 throw new InternalError("Malformed class name");
1302 int index = 1;
1303 while (index < length && isAsciiDigit(simpleName.charAt(index)))
1304 index++;
1305 // Eventually, this is the empty string iff this is an anonymous class
1306 return simpleName.substring(index);
1307 }
1308
1309 /**
1310 * Return an informative string for the name of this type.
1311 *
1312 * @return an informative string for the name of this type
1313 * @since 1.8
1314 */
1315 public String getTypeName() {
1316 if (isArray()) {
1317 try {
1318 Class<?> cl = this;
1319 int dimensions = 0;
1320 while (cl.isArray()) {
1321 dimensions++;
1322 cl = cl.getComponentType();
1323 }
1324 StringBuilder sb = new StringBuilder();
1325 sb.append(cl.getName());
1326 for (int i = 0; i < dimensions; i++) {
1327 sb.append("[]");
1328 }
1329 return sb.toString();
1330 } catch (Throwable e) { /*FALLTHRU*/ }
1331 }
1332 return getName();
1333 }
1334
1335 /**
1336 * Character.isDigit answers {@code true} to some non-ascii
1337 * digits. This one does not.
1338 */
1339 private static boolean isAsciiDigit(char c) {
1340 return '0' <= c && c <= '9';
1341 }
1342
1343 /**
1344 * Returns the canonical name of the underlying class as
1345 * defined by the Java Language Specification. Returns null if
1346 * the underlying class does not have a canonical name (i.e., if
1347 * it is a local or anonymous class or an array whose component
1348 * type does not have a canonical name).
1349 * @return the canonical name of the underlying class if it exists, and
1350 * {@code null} otherwise.
1351 * @since 1.5
1352 */
1353 public String getCanonicalName() {
1354 if (isArray()) {
1355 String canonicalName = getComponentType().getCanonicalName();
1356 if (canonicalName != null)
1357 return canonicalName + "[]";
1358 else
1359 return null;
1360 }
1361 if (isLocalOrAnonymousClass())
1362 return null;
1363 Class<?> enclosingClass = getEnclosingClass();
1364 if (enclosingClass == null) { // top level class
1365 return getName();
1366 } else {
1367 String enclosingName = enclosingClass.getCanonicalName();
1368 if (enclosingName == null)
1369 return null;
1370 return enclosingName + "." + getSimpleName();
1371 }
1372 }
1373
1374 /**
1375 * Returns {@code true} if and only if the underlying class
1376 * is an anonymous class.
1377 *
1378 * @return {@code true} if and only if this class is an anonymous class.
1379 * @since 1.5
1380 */
1381 public boolean isAnonymousClass() {
1382 return "".equals(getSimpleName());
1383 }
1384
1385 /**
1386 * Returns {@code true} if and only if the underlying class
1387 * is a local class.
1388 *
1389 * @return {@code true} if and only if this class is a local class.
1390 * @since 1.5
1391 */
1392 public boolean isLocalClass() {
1393 return isLocalOrAnonymousClass() && !isAnonymousClass();
1394 }
1395
1396 /**
1397 * Returns {@code true} if and only if the underlying class
1398 * is a member class.
1399 *
1400 * @return {@code true} if and only if this class is a member class.
1401 * @since 1.5
1402 */
1403 public boolean isMemberClass() {
1404 return getSimpleBinaryName() != null && !isLocalOrAnonymousClass();
1405 }
1406
1407 /**
1408 * Returns the "simple binary name" of the underlying class, i.e.,
1409 * the binary name without the leading enclosing class name.
1410 * Returns {@code null} if the underlying class is a top level
1411 * class.
1412 */
1413 private String getSimpleBinaryName() {
1414 Class<?> enclosingClass = getEnclosingClass();
1415 if (enclosingClass == null) // top level class
1416 return null;
1417 // Otherwise, strip the enclosing class' name
1418 try {
1419 return getName().substring(enclosingClass.getName().length());
1420 } catch (IndexOutOfBoundsException ex) {
1421 throw new InternalError("Malformed class name", ex);
1422 }
1423 }
1424
1425 /**
1426 * Returns {@code true} if this is a local class or an anonymous
1427 * class. Returns {@code false} otherwise.
1428 */
1429 private boolean isLocalOrAnonymousClass() {
1430 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1431 // attribute if and only if it is a local class or an
1432 // anonymous class.
1433 return getEnclosingMethodInfo() != null;
1434 }
1435
1436 /**
1437 * Returns an array containing {@code Class} objects representing all
1438 * the public classes and interfaces that are members of the class
1439 * represented by this {@code Class} object. This includes public
1440 * class and interface members inherited from superclasses and public class
1441 * and interface members declared by the class. This method returns an
1442 * array of length 0 if this {@code Class} object has no public member
1443 * classes or interfaces. This method also returns an array of length 0 if
1444 * this {@code Class} object represents a primitive type, an array
1445 * class, or void.
1446 *
1447 * @return the array of {@code Class} objects representing the public
1448 * members of this class
1449 * @throws SecurityException
1450 * If a security manager, <i>s</i>, is present and
1451 * the caller's class loader is not the same as or an
1452 * ancestor of the class loader for the current class and
1453 * invocation of {@link SecurityManager#checkPackageAccess
1454 * s.checkPackageAccess()} denies access to the package
1455 * of this class.
1456 *
1457 * @since JDK1.1
1458 */
1459 @CallerSensitive
1460 public Class<?>[] getClasses() {
1461 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
1462
1463 // Privileged so this implementation can look at DECLARED classes,
1464 // something the caller might not have privilege to do. The code here
1465 // is allowed to look at DECLARED classes because (1) it does not hand
1466 // out anything other than public members and (2) public member access
1467 // has already been ok'd by the SecurityManager.
1468
1469 return java.security.AccessController.doPrivileged(
1470 new java.security.PrivilegedAction<Class<?>[]>() {
1471 public Class<?>[] run() {
1472 List<Class<?>> list = new ArrayList<>();
1473 Class<?> currentClass = Class.this;
1474 while (currentClass != null) {
1475 Class<?>[] members = currentClass.getDeclaredClasses();
1476 for (int i = 0; i < members.length; i++) {
1477 if (Modifier.isPublic(members[i].getModifiers())) {
1478 list.add(members[i]);
1479 }
1480 }
1481 currentClass = currentClass.getSuperclass();
1482 }
1483 return list.toArray(new Class<?>[0]);
1484 }
1485 });
1486 }
1487
1488
1489 /**
1490 * Returns an array containing {@code Field} objects reflecting all
1491 * the accessible public fields of the class or interface represented by
1492 * this {@code Class} object.
1493 *
1494 * <p> If this {@code Class} object represents a class or interface with no
1495 * no accessible public fields, then this method returns an array of length
1496 * 0.
1497 *
1498 * <p> If this {@code Class} object represents a class, then this method
1499 * returns the public fields of the class and of all its superclasses.
1500 *
1501 * <p> If this {@code Class} object represents an interface, then this
1502 * method returns the fields of the interface and of all its
1503 * superinterfaces.
1504 *
1505 * <p> If this {@code Class} object represents an array type, a primitive
1506 * type, or void, then this method returns an array of length 0.
1507 *
1508 * <p> The elements in the returned array are not sorted and are not in any
1509 * particular order.
1510 *
1511 * @return the array of {@code Field} objects representing the
1512 * public fields
1513 * @throws SecurityException
1514 * If a security manager, <i>s</i>, is present and
1515 * the caller's class loader is not the same as or an
1516 * ancestor of the class loader for the current class and
1517 * invocation of {@link SecurityManager#checkPackageAccess
1518 * s.checkPackageAccess()} denies access to the package
1519 * of this class.
1520 *
1521 * @since JDK1.1
1522 * @jls 8.2 Class Members
1523 * @jls 8.3 Field Declarations
1524 */
1525 @CallerSensitive
1526 public Field[] getFields() throws SecurityException {
1527 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1528 return copyFields(privateGetPublicFields(null));
1529 }
1530
1531
1532 /**
1533 * Returns an array containing {@code Method} objects reflecting all the
1534 * public methods of the class or interface represented by this {@code
1535 * Class} object, including those declared by the class or interface and
1536 * those inherited from superclasses and superinterfaces.
1537 *
1538 * <p> If this {@code Class} object represents a type that has multiple
1539 * public methods with the same name and parameter types, but different
1540 * return types, then the returned array has a {@code Method} object for
1541 * each such method.
1542 *
1543 * <p> If this {@code Class} object represents a type with a class
1544 * initialization method {@code <clinit>}, then the returned array does
1545 * <em>not</em> have a corresponding {@code Method} object.
1546 *
1547 * <p> If this {@code Class} object represents an array type, then the
1548 * returned array has a {@code Method} object for each of the public
1549 * methods inherited by the array type from {@code Object}. It does not
1550 * contain a {@code Method} object for {@code clone()}.
1551 *
1552 * <p> If this {@code Class} object represents a class or interface with no
1553 * public methods, then the returned array has length 0.
1554 *
1555 * <p> If this {@code Class} object represents a primitive type or void,
1556 * then the returned array has length 0.
1557 *
1558 * <p> The elements in the returned array are not sorted and are not in any
1559 * particular order.
1560 *
1561 * @return the array of {@code Method} objects representing the
1562 * public methods of this class
1563 * @throws SecurityException
1564 * If a security manager, <i>s</i>, is present and
1565 * the caller's class loader is not the same as or an
1566 * ancestor of the class loader for the current class and
1567 * invocation of {@link SecurityManager#checkPackageAccess
1568 * s.checkPackageAccess()} denies access to the package
1569 * of this class.
1570 *
1571 * @jls 8.2 Class Members
1572 * @jls 8.4 Method Declarations
1573 * @since JDK1.1
1574 */
1575 @CallerSensitive
1576 public Method[] getMethods() throws SecurityException {
1577 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1578 return copyMethods(privateGetPublicMethods());
1579 }
1580
1581
1582 /**
1583 * Returns an array containing {@code Constructor} objects reflecting
1584 * all the public constructors of the class represented by this
1585 * {@code Class} object. An array of length 0 is returned if the
1586 * class has no public constructors, or if the class is an array class, or
1587 * if the class reflects a primitive type or void.
1588 *
1589 * Note that while this method returns an array of {@code
1590 * Constructor<T>} objects (that is an array of constructors from
1591 * this class), the return type of this method is {@code
1592 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1593 * might be expected. This less informative return type is
1594 * necessary since after being returned from this method, the
1595 * array could be modified to hold {@code Constructor} objects for
1596 * different classes, which would violate the type guarantees of
1597 * {@code Constructor<T>[]}.
1598 *
1599 * @return the array of {@code Constructor} objects representing the
1600 * public constructors of this class
1601 * @throws SecurityException
1602 * If a security manager, <i>s</i>, is present and
1603 * the caller's class loader is not the same as or an
1604 * ancestor of the class loader for the current class and
1605 * invocation of {@link SecurityManager#checkPackageAccess
1606 * s.checkPackageAccess()} denies access to the package
1607 * of this class.
1608 *
1609 * @since JDK1.1
1610 */
1611 @CallerSensitive
1612 public Constructor<?>[] getConstructors() throws SecurityException {
1613 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1614 return copyConstructors(privateGetDeclaredConstructors(true));
1615 }
1616
1617
1618 /**
1619 * Returns a {@code Field} object that reflects the specified public member
1620 * field of the class or interface represented by this {@code Class}
1621 * object. The {@code name} parameter is a {@code String} specifying the
1622 * simple name of the desired field.
1623 *
1624 * <p> The field to be reflected is determined by the algorithm that
1625 * follows. Let C be the class or interface represented by this object:
1626 *
1627 * <OL>
1628 * <LI> If C declares a public field with the name specified, that is the
1629 * field to be reflected.</LI>
1630 * <LI> If no field was found in step 1 above, this algorithm is applied
1631 * recursively to each direct superinterface of C. The direct
1632 * superinterfaces are searched in the order they were declared.</LI>
1633 * <LI> If no field was found in steps 1 and 2 above, and C has a
1634 * superclass S, then this algorithm is invoked recursively upon S.
1635 * If C has no superclass, then a {@code NoSuchFieldException}
1636 * is thrown.</LI>
1637 * </OL>
1638 *
1639 * <p> If this {@code Class} object represents an array type, then this
1640 * method does not find the {@code length} field of the array type.
1641 *
1642 * @param name the field name
1643 * @return the {@code Field} object of this class specified by
1644 * {@code name}
1645 * @throws NoSuchFieldException if a field with the specified name is
1646 * not found.
1647 * @throws NullPointerException if {@code name} is {@code null}
1648 * @throws SecurityException
1649 * If a security manager, <i>s</i>, is present and
1650 * the caller's class loader is not the same as or an
1651 * ancestor of the class loader for the current class and
1652 * invocation of {@link SecurityManager#checkPackageAccess
1653 * s.checkPackageAccess()} denies access to the package
1654 * of this class.
1655 *
1656 * @since JDK1.1
1657 * @jls 8.2 Class Members
1658 * @jls 8.3 Field Declarations
1659 */
1660 @CallerSensitive
1661 public Field getField(String name)
1662 throws NoSuchFieldException, SecurityException {
1663 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1664 Field field = getField0(name);
1665 if (field == null) {
1666 throw new NoSuchFieldException(name);
1667 }
1668 return field;
1669 }
1670
1671
1672 /**
1673 * Returns a {@code Method} object that reflects the specified public
1674 * member method of the class or interface represented by this
1675 * {@code Class} object. The {@code name} parameter is a
1676 * {@code String} specifying the simple name of the desired method. The
1677 * {@code parameterTypes} parameter is an array of {@code Class}
1678 * objects that identify the method's formal parameter types, in declared
1679 * order. If {@code parameterTypes} is {@code null}, it is
1680 * treated as if it were an empty array.
1681 *
1682 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
1683 * {@code NoSuchMethodException} is raised. Otherwise, the method to
1684 * be reflected is determined by the algorithm that follows. Let C be the
1685 * class represented by this object:
1686 * <OL>
1687 * <LI> C is searched for any <I>matching methods</I>. If no matching
1688 * method is found, the algorithm of step 1 is invoked recursively on
1689 * the superclass of C.</LI>
1690 * <LI> If no method was found in step 1 above, the superinterfaces of C
1691 * are searched for a matching method. If any such method is found, it
1692 * is reflected.</LI>
1693 * </OL>
1694 *
1695 * To find a matching method in a class C: If C declares exactly one
1696 * public method with the specified name and exactly the same formal
1697 * parameter types, that is the method reflected. If more than one such
1698 * method is found in C, and one of these methods has a return type that is
1699 * more specific than any of the others, that method is reflected;
1700 * otherwise one of the methods is chosen arbitrarily.
1701 *
1702 * <p>Note that there may be more than one matching method in a
1703 * class because while the Java language forbids a class to
1704 * declare multiple methods with the same signature but different
1705 * return types, the Java virtual machine does not. This
1706 * increased flexibility in the virtual machine can be used to
1707 * implement various language features. For example, covariant
1708 * returns can be implemented with {@linkplain
1709 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1710 * method and the method being overridden would have the same
1711 * signature but different return types.
1712 *
1713 * <p> If this {@code Class} object represents an array type, then this
1714 * method does not find the {@code clone()} method.
1715 *
1716 * @param name the name of the method
1717 * @param parameterTypes the list of parameters
1718 * @return the {@code Method} object that matches the specified
1719 * {@code name} and {@code parameterTypes}
1720 * @throws NoSuchMethodException if a matching method is not found
1721 * or if the name is "<init>"or "<clinit>".
1722 * @throws NullPointerException if {@code name} is {@code null}
1723 * @throws SecurityException
1724 * If a security manager, <i>s</i>, is present and
1725 * the caller's class loader is not the same as or an
1726 * ancestor of the class loader for the current class and
1727 * invocation of {@link SecurityManager#checkPackageAccess
1728 * s.checkPackageAccess()} denies access to the package
1729 * of this class.
1730 *
1731 * @jls 8.2 Class Members
1732 * @jls 8.4 Method Declarations
1733 * @since JDK1.1
1734 */
1735 @CallerSensitive
1736 public Method getMethod(String name, Class<?>... parameterTypes)
1737 throws NoSuchMethodException, SecurityException {
1738 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1739 Method method = getMethod0(name, parameterTypes);
1740 if (method == null) {
1741 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1742 }
1743 return method;
1744 }
1745
1746
1747 /**
1748 * Returns a {@code Constructor} object that reflects the specified
1749 * public constructor of the class represented by this {@code Class}
1750 * object. The {@code parameterTypes} parameter is an array of
1751 * {@code Class} objects that identify the constructor's formal
1752 * parameter types, in declared order.
1753 *
1754 * If this {@code Class} object represents an inner class
1755 * declared in a non-static context, the formal parameter types
1756 * include the explicit enclosing instance as the first parameter.
1757 *
1758 * <p> The constructor to reflect is the public constructor of the class
1759 * represented by this {@code Class} object whose formal parameter
1760 * types match those specified by {@code parameterTypes}.
1761 *
1762 * @param parameterTypes the parameter array
1763 * @return the {@code Constructor} object of the public constructor that
1764 * matches the specified {@code parameterTypes}
1765 * @throws NoSuchMethodException if a matching method is not found.
1766 * @throws SecurityException
1767 * If a security manager, <i>s</i>, is present and
1768 * the caller's class loader is not the same as or an
1769 * ancestor of the class loader for the current class and
1770 * invocation of {@link SecurityManager#checkPackageAccess
1771 * s.checkPackageAccess()} denies access to the package
1772 * of this class.
1773 *
1774 * @since JDK1.1
1775 */
1776 @CallerSensitive
1777 public Constructor<T> getConstructor(Class<?>... parameterTypes)
1778 throws NoSuchMethodException, SecurityException {
1779 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1780 return getConstructor0(parameterTypes, Member.PUBLIC);
1781 }
1782
1783
1784 /**
1785 * Returns an array of {@code Class} objects reflecting all the
1786 * classes and interfaces declared as members of the class represented by
1787 * this {@code Class} object. This includes public, protected, default
1788 * (package) access, and private classes and interfaces declared by the
1789 * class, but excludes inherited classes and interfaces. This method
1790 * returns an array of length 0 if the class declares no classes or
1791 * interfaces as members, or if this {@code Class} object represents a
1792 * primitive type, an array class, or void.
1793 *
1794 * @return the array of {@code Class} objects representing all the
1795 * declared members of this class
1796 * @throws SecurityException
1797 * If a security manager, <i>s</i>, is present and any of the
1798 * following conditions is met:
1799 *
1800 * <ul>
1801 *
1802 * <li> the caller's class loader is not the same as the
1803 * class loader of this class and invocation of
1804 * {@link SecurityManager#checkPermission
1805 * s.checkPermission} method with
1806 * {@code RuntimePermission("accessDeclaredMembers")}
1807 * denies access to the declared classes within this class
1808 *
1809 * <li> the caller's class loader is not the same as or an
1810 * ancestor of the class loader for the current class and
1811 * invocation of {@link SecurityManager#checkPackageAccess
1812 * s.checkPackageAccess()} denies access to the package
1813 * of this class
1814 *
1815 * </ul>
1816 *
1817 * @since JDK1.1
1818 */
1819 @CallerSensitive
1820 public Class<?>[] getDeclaredClasses() throws SecurityException {
1821 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), false);
1822 return getDeclaredClasses0();
1823 }
1824
1825
1826 /**
1827 * Returns an array of {@code Field} objects reflecting all the fields
1828 * declared by the class or interface represented by this
1829 * {@code Class} object. This includes public, protected, default
1830 * (package) access, and private fields, but excludes inherited fields.
1831 *
1832 * <p> If this {@code Class} object represents a class or interface with no
1833 * declared fields, then this method returns an array of length 0.
1834 *
1835 * <p> If this {@code Class} object represents an array type, a primitive
1836 * type, or void, then this method returns an array of length 0.
1837 *
1838 * <p> The elements in the returned array are not sorted and are not in any
1839 * particular order.
1840 *
1841 * @return the array of {@code Field} objects representing all the
1842 * declared fields of this class
1843 * @throws SecurityException
1844 * If a security manager, <i>s</i>, is present and any of the
1845 * following conditions is met:
1846 *
1847 * <ul>
1848 *
1849 * <li> the caller's class loader is not the same as the
1850 * class loader of this class and invocation of
1851 * {@link SecurityManager#checkPermission
1852 * s.checkPermission} method with
1853 * {@code RuntimePermission("accessDeclaredMembers")}
1854 * denies access to the declared fields within this class
1855 *
1856 * <li> the caller's class loader is not the same as or an
1857 * ancestor of the class loader for the current class and
1858 * invocation of {@link SecurityManager#checkPackageAccess
1859 * s.checkPackageAccess()} denies access to the package
1860 * of this class
1861 *
1862 * </ul>
1863 *
1864 * @since JDK1.1
1865 * @jls 8.2 Class Members
1866 * @jls 8.3 Field Declarations
1867 */
1868 @CallerSensitive
1869 public Field[] getDeclaredFields() throws SecurityException {
1870 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
1871 return copyFields(privateGetDeclaredFields(false));
1872 }
1873
1874
1875 /**
1876 *
1877 * Returns an array containing {@code Method} objects reflecting all the
1878 * declared methods of the class or interface represented by this {@code
1879 * Class} object, including public, protected, default (package)
1880 * access, and private methods, but excluding inherited methods.
1881 *
1882 * <p> If this {@code Class} object represents a type that has multiple
1883 * declared methods with the same name and parameter types, but different
1884 * return types, then the returned array has a {@code Method} object for
1885 * each such method.
1886 *
1887 * <p> If this {@code Class} object represents a type that has a class
1888 * initialization method {@code <clinit>}, then the returned array does
1889 * <em>not</em> have a corresponding {@code Method} object.
1890 *
1891 * <p> If this {@code Class} object represents a class or interface with no
1892 * declared methods, then the returned array has length 0.
1893 *
1894 * <p> If this {@code Class} object represents an array type, a primitive
1895 * type, or void, then the returned array has length 0.
1896 *
1897 * <p> The elements in the returned array are not sorted and are not in any
1898 * particular order.
1899 *
1900 * @return the array of {@code Method} objects representing all the
1901 * declared methods of this class
1902 * @throws SecurityException
1903 * If a security manager, <i>s</i>, is present and any of the
1904 * following conditions is met:
1905 *
1906 * <ul>
1907 *
1908 * <li> the caller's class loader is not the same as the
1909 * class loader of this class and invocation of
1910 * {@link SecurityManager#checkPermission
1911 * s.checkPermission} method with
1912 * {@code RuntimePermission("accessDeclaredMembers")}
1913 * denies access to the declared methods within this class
1914 *
1915 * <li> the caller's class loader is not the same as or an
1916 * ancestor of the class loader for the current class and
1917 * invocation of {@link SecurityManager#checkPackageAccess
1918 * s.checkPackageAccess()} denies access to the package
1919 * of this class
1920 *
1921 * </ul>
1922 *
1923 * @jls 8.2 Class Members
1924 * @jls 8.4 Method Declarations
1925 * @since JDK1.1
1926 */
1927 @CallerSensitive
1928 public Method[] getDeclaredMethods() throws SecurityException {
1929 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
1930 return copyMethods(privateGetDeclaredMethods(false));
1931 }
1932
1933
1934 /**
1935 * Returns an array of {@code Constructor} objects reflecting all the
1936 * constructors declared by the class represented by this
1937 * {@code Class} object. These are public, protected, default
1938 * (package) access, and private constructors. The elements in the array
1939 * returned are not sorted and are not in any particular order. If the
1940 * class has a default constructor, it is included in the returned array.
1941 * This method returns an array of length 0 if this {@code Class}
1942 * object represents an interface, a primitive type, an array class, or
1943 * void.
1944 *
1945 * <p> See <em>The Java Language Specification</em>, section 8.2.
1946 *
1947 * @return the array of {@code Constructor} objects representing all the
1948 * declared constructors of this class
1949 * @throws SecurityException
1950 * If a security manager, <i>s</i>, is present and any of the
1951 * following conditions is met:
1952 *
1953 * <ul>
1954 *
1955 * <li> the caller's class loader is not the same as the
1956 * class loader of this class and invocation of
1957 * {@link SecurityManager#checkPermission
1958 * s.checkPermission} method with
1959 * {@code RuntimePermission("accessDeclaredMembers")}
1960 * denies access to the declared constructors within this class
1961 *
1962 * <li> the caller's class loader is not the same as or an
1963 * ancestor of the class loader for the current class and
1964 * invocation of {@link SecurityManager#checkPackageAccess
1965 * s.checkPackageAccess()} denies access to the package
1966 * of this class
1967 *
1968 * </ul>
1969 *
1970 * @since JDK1.1
1971 */
1972 @CallerSensitive
1973 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
1974 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
1975 return copyConstructors(privateGetDeclaredConstructors(false));
1976 }
1977
1978
1979 /**
1980 * Returns a {@code Field} object that reflects the specified declared
1981 * field of the class or interface represented by this {@code Class}
1982 * object. The {@code name} parameter is a {@code String} that specifies
1983 * the simple name of the desired field.
1984 *
1985 * <p> If this {@code Class} object represents an array type, then this
1986 * method does not find the {@code length} field of the array type.
1987 *
1988 * @param name the name of the field
1989 * @return the {@code Field} object for the specified field in this
1990 * class
1991 * @throws NoSuchFieldException if a field with the specified name is
1992 * not found.
1993 * @throws NullPointerException if {@code name} is {@code null}
1994 * @throws SecurityException
1995 * If a security manager, <i>s</i>, is present and any of the
1996 * following conditions is met:
1997 *
1998 * <ul>
1999 *
2000 * <li> the caller's class loader is not the same as the
2001 * class loader of this class and invocation of
2002 * {@link SecurityManager#checkPermission
2003 * s.checkPermission} method with
2004 * {@code RuntimePermission("accessDeclaredMembers")}
2005 * denies access to the declared field
2006 *
2007 * <li> the caller's class loader is not the same as or an
2008 * ancestor of the class loader for the current class and
2009 * invocation of {@link SecurityManager#checkPackageAccess
2010 * s.checkPackageAccess()} denies access to the package
2011 * of this class
2012 *
2013 * </ul>
2014 *
2015 * @since JDK1.1
2016 * @jls 8.2 Class Members
2017 * @jls 8.3 Field Declarations
2018 */
2019 @CallerSensitive
2020 public Field getDeclaredField(String name)
2021 throws NoSuchFieldException, SecurityException {
2022 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2023 Field field = searchFields(privateGetDeclaredFields(false), name);
2024 if (field == null) {
2025 throw new NoSuchFieldException(name);
2026 }
2027 return field;
2028 }
2029
2030
2031 /**
2032 * Returns a {@code Method} object that reflects the specified
2033 * declared method of the class or interface represented by this
2034 * {@code Class} object. The {@code name} parameter is a
2035 * {@code String} that specifies the simple name of the desired
2036 * method, and the {@code parameterTypes} parameter is an array of
2037 * {@code Class} objects that identify the method's formal parameter
2038 * types, in declared order. If more than one method with the same
2039 * parameter types is declared in a class, and one of these methods has a
2040 * return type that is more specific than any of the others, that method is
2041 * returned; otherwise one of the methods is chosen arbitrarily. If the
2042 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
2043 * is raised.
2044 *
2045 * <p> If this {@code Class} object represents an array type, then this
2046 * method does not find the {@code clone()} method.
2047 *
2048 * @param name the name of the method
2049 * @param parameterTypes the parameter array
2050 * @return the {@code Method} object for the method of this class
2051 * matching the specified name and parameters
2052 * @throws NoSuchMethodException if a matching method is not found.
2053 * @throws NullPointerException if {@code name} is {@code null}
2054 * @throws SecurityException
2055 * If a security manager, <i>s</i>, is present and any of the
2056 * following conditions is met:
2057 *
2058 * <ul>
2059 *
2060 * <li> the caller's class loader is not the same as the
2061 * class loader of this class and invocation of
2062 * {@link SecurityManager#checkPermission
2063 * s.checkPermission} method with
2064 * {@code RuntimePermission("accessDeclaredMembers")}
2065 * denies access to the declared method
2066 *
2067 * <li> the caller's class loader is not the same as or an
2068 * ancestor of the class loader for the current class and
2069 * invocation of {@link SecurityManager#checkPackageAccess
2070 * s.checkPackageAccess()} denies access to the package
2071 * of this class
2072 *
2073 * </ul>
2074 *
2075 * @jls 8.2 Class Members
2076 * @jls 8.4 Method Declarations
2077 * @since JDK1.1
2078 */
2079 @CallerSensitive
2080 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
2081 throws NoSuchMethodException, SecurityException {
2082 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2083 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
2084 if (method == null) {
2085 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
2086 }
2087 return method;
2088 }
2089
2090
2091 /**
2092 * Returns a {@code Constructor} object that reflects the specified
2093 * constructor of the class or interface represented by this
2094 * {@code Class} object. The {@code parameterTypes} parameter is
2095 * an array of {@code Class} objects that identify the constructor's
2096 * formal parameter types, in declared order.
2097 *
2098 * If this {@code Class} object represents an inner class
2099 * declared in a non-static context, the formal parameter types
2100 * include the explicit enclosing instance as the first parameter.
2101 *
2102 * @param parameterTypes the parameter array
2103 * @return The {@code Constructor} object for the constructor with the
2104 * specified parameter list
2105 * @throws NoSuchMethodException if a matching method is not found.
2106 * @throws SecurityException
2107 * If a security manager, <i>s</i>, is present and any of the
2108 * following conditions is met:
2109 *
2110 * <ul>
2111 *
2112 * <li> the caller's class loader is not the same as the
2113 * class loader of this class and invocation of
2114 * {@link SecurityManager#checkPermission
2115 * s.checkPermission} method with
2116 * {@code RuntimePermission("accessDeclaredMembers")}
2117 * denies access to the declared constructor
2118 *
2119 * <li> the caller's class loader is not the same as or an
2120 * ancestor of the class loader for the current class and
2121 * invocation of {@link SecurityManager#checkPackageAccess
2122 * s.checkPackageAccess()} denies access to the package
2123 * of this class
2124 *
2125 * </ul>
2126 *
2127 * @since JDK1.1
2128 */
2129 @CallerSensitive
2130 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
2131 throws NoSuchMethodException, SecurityException {
2132 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2133 return getConstructor0(parameterTypes, Member.DECLARED);
2134 }
2135
2136 /**
2137 * Finds a resource with a given name. The rules for searching resources
2138 * associated with a given class are implemented by the defining
2139 * {@linkplain ClassLoader class loader} of the class. This method
2140 * delegates to this object's class loader. If this object was loaded by
2141 * the bootstrap class loader, the method delegates to {@link
2142 * ClassLoader#getSystemResourceAsStream}.
2143 *
2144 * <p> Before delegation, an absolute resource name is constructed from the
2145 * given resource name using this algorithm:
2146 *
2147 * <ul>
2148 *
2149 * <li> If the {@code name} begins with a {@code '/'}
2150 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2151 * portion of the {@code name} following the {@code '/'}.
2152 *
2153 * <li> Otherwise, the absolute name is of the following form:
2154 *
2155 * <blockquote>
2156 * {@code modified_package_name/name}
2157 * </blockquote>
2158 *
2159 * <p> Where the {@code modified_package_name} is the package name of this
2160 * object with {@code '/'} substituted for {@code '.'}
2161 * (<tt>'\u002e'</tt>).
2162 *
2163 * </ul>
2164 *
2165 * @param name name of the desired resource
2166 * @return A {@link java.io.InputStream} object or {@code null} if
2167 * no resource with this name is found
2168 * @throws NullPointerException If {@code name} is {@code null}
2169 * @since JDK1.1
2170 */
2171 public InputStream getResourceAsStream(String name) {
2172 name = resolveName(name);
2173 ClassLoader cl = getClassLoader0();
2174 if (cl==null) {
2175 // A system class.
2176 return ClassLoader.getSystemResourceAsStream(name);
2177 }
2178 return cl.getResourceAsStream(name);
2179 }
2180
2181 /**
2182 * Finds a resource with a given name. The rules for searching resources
2183 * associated with a given class are implemented by the defining
2184 * {@linkplain ClassLoader class loader} of the class. This method
2185 * delegates to this object's class loader. If this object was loaded by
2186 * the bootstrap class loader, the method delegates to {@link
2187 * ClassLoader#getSystemResource}.
2188 *
2189 * <p> Before delegation, an absolute resource name is constructed from the
2190 * given resource name using this algorithm:
2191 *
2192 * <ul>
2193 *
2194 * <li> If the {@code name} begins with a {@code '/'}
2195 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2196 * portion of the {@code name} following the {@code '/'}.
2197 *
2198 * <li> Otherwise, the absolute name is of the following form:
2199 *
2200 * <blockquote>
2201 * {@code modified_package_name/name}
2202 * </blockquote>
2203 *
2204 * <p> Where the {@code modified_package_name} is the package name of this
2205 * object with {@code '/'} substituted for {@code '.'}
2206 * (<tt>'\u002e'</tt>).
2207 *
2208 * </ul>
2209 *
2210 * @param name name of the desired resource
2211 * @return A {@link java.net.URL} object or {@code null} if no
2212 * resource with this name is found
2213 * @since JDK1.1
2214 */
2215 public java.net.URL getResource(String name) {
2216 name = resolveName(name);
2217 ClassLoader cl = getClassLoader0();
2218 if (cl==null) {
2219 // A system class.
2220 return ClassLoader.getSystemResource(name);
2221 }
2222 return cl.getResource(name);
2223 }
2224
2225
2226
2227 /** protection domain returned when the internal domain is null */
2228 private static java.security.ProtectionDomain allPermDomain;
2229
2230
2231 /**
2232 * Returns the {@code ProtectionDomain} of this class. If there is a
2233 * security manager installed, this method first calls the security
2234 * manager's {@code checkPermission} method with a
2235 * {@code RuntimePermission("getProtectionDomain")} permission to
2236 * ensure it's ok to get the
2237 * {@code ProtectionDomain}.
2238 *
2239 * @return the ProtectionDomain of this class
2240 *
2241 * @throws SecurityException
2242 * if a security manager exists and its
2243 * {@code checkPermission} method doesn't allow
2244 * getting the ProtectionDomain.
2245 *
2246 * @see java.security.ProtectionDomain
2247 * @see SecurityManager#checkPermission
2248 * @see java.lang.RuntimePermission
2249 * @since 1.2
2250 */
2251 public java.security.ProtectionDomain getProtectionDomain() {
2252 SecurityManager sm = System.getSecurityManager();
2253 if (sm != null) {
2254 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2255 }
2256 java.security.ProtectionDomain pd = getProtectionDomain0();
2257 if (pd == null) {
2258 if (allPermDomain == null) {
2259 java.security.Permissions perms =
2260 new java.security.Permissions();
2261 perms.add(SecurityConstants.ALL_PERMISSION);
2262 allPermDomain =
2263 new java.security.ProtectionDomain(null, perms);
2264 }
2265 pd = allPermDomain;
2266 }
2267 return pd;
2268 }
2269
2270
2271 /**
2272 * Returns the ProtectionDomain of this class.
2273 */
2274 private native java.security.ProtectionDomain getProtectionDomain0();
2275
2276 /*
2277 * Return the Virtual Machine's Class object for the named
2278 * primitive type.
2279 */
2280 static native Class<?> getPrimitiveClass(String name);
2281
2282 /*
2283 * Check if client is allowed to access members. If access is denied,
2284 * throw a SecurityException.
2285 *
2286 * This method also enforces package access.
2287 *
2288 * <p> Default policy: allow all clients access with normal Java access
2289 * control.
2290 */
2291 private void checkMemberAccess(int which, Class<?> caller, boolean checkProxyInterfaces) {
2292 final SecurityManager s = System.getSecurityManager();
2293 if (s != null) {
2294 /* Default policy allows access to all {@link Member#PUBLIC} members,
2295 * as well as access to classes that have the same class loader as the caller.
2296 * In all other cases, it requires RuntimePermission("accessDeclaredMembers")
2297 * permission.
2298 */
2299 final ClassLoader ccl = ClassLoader.getClassLoader(caller);
2300 final ClassLoader cl = getClassLoader0();
2301 if (which != Member.PUBLIC) {
2302 if (ccl != cl) {
2303 s.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
2304 }
2305 }
2306 this.checkPackageAccess(ccl, checkProxyInterfaces);
2307 }
2308 }
2309
2310 /*
2311 * Checks if a client loaded in ClassLoader ccl is allowed to access this
2312 * class under the current package access policy. If access is denied,
2313 * throw a SecurityException.
2314 */
2315 private void checkPackageAccess(final ClassLoader ccl, boolean checkProxyInterfaces) {
2316 final SecurityManager s = System.getSecurityManager();
2317 if (s != null) {
2318 final ClassLoader cl = getClassLoader0();
2319
2320 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2321 String name = this.getName();
2322 int i = name.lastIndexOf('.');
2323 if (i != -1) {
2324 // skip the package access check on a proxy class in default proxy package
2325 String pkg = name.substring(0, i);
2326 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
2327 s.checkPackageAccess(pkg);
2328 }
2329 }
2330 }
2331 // check package access on the proxy interfaces
2332 if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
2333 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
2334 }
2335 }
2336 }
2337
2338 /**
2339 * Add a package name prefix if the name is not absolute Remove leading "/"
2340 * if name is absolute
2341 */
2342 private String resolveName(String name) {
2343 if (name == null) {
2344 return name;
2345 }
2346 if (!name.startsWith("/")) {
2347 Class<?> c = this;
2348 while (c.isArray()) {
2349 c = c.getComponentType();
2350 }
2351 String baseName = c.getName();
2352 int index = baseName.lastIndexOf('.');
2353 if (index != -1) {
2354 name = baseName.substring(0, index).replace('.', '/')
2355 +"/"+name;
2356 }
2357 } else {
2358 name = name.substring(1);
2359 }
2360 return name;
2361 }
2362
2363 /**
2364 * Atomic operations support.
2365 */
2366 private static class Atomic {
2367 // initialize Unsafe machinery here, since we need to call Class.class instance method
2368 // and have to avoid calling it in the static initializer of the Class class...
2369 private static final Unsafe unsafe = Unsafe.getUnsafe();
2370 // offset of Class.reflectionData instance field
2371 private static final long reflectionDataOffset;
2372 // offset of Class.annotationType instance field
2373 private static final long annotationTypeOffset;
2374 // offset of Class.annotationData instance field
2375 private static final long annotationDataOffset;
2376
2377 static {
2378 Field[] fields = Class.class.getDeclaredFields0(false); // bypass caches
2379 reflectionDataOffset = objectFieldOffset(fields, "reflectionData");
2380 annotationTypeOffset = objectFieldOffset(fields, "annotationType");
2381 annotationDataOffset = objectFieldOffset(fields, "annotationData");
2382 }
2383
2384 private static long objectFieldOffset(Field[] fields, String fieldName) {
2385 Field field = searchFields(fields, fieldName);
2386 if (field == null) {
2387 throw new Error("No " + fieldName + " field found in java.lang.Class");
2388 }
2389 return unsafe.objectFieldOffset(field);
2390 }
2391
2392 static <T> boolean casReflectionData(Class<?> clazz,
2393 SoftReference<ReflectionData<T>> oldData,
2394 SoftReference<ReflectionData<T>> newData) {
2395 return unsafe.compareAndSwapObject(clazz, reflectionDataOffset, oldData, newData);
2396 }
2397
2398 static <T> boolean casAnnotationType(Class<?> clazz,
2399 AnnotationType oldType,
2400 AnnotationType newType) {
2401 return unsafe.compareAndSwapObject(clazz, annotationTypeOffset, oldType, newType);
2402 }
2403
2404 static <T> boolean casAnnotationData(Class<?> clazz,
2405 AnnotationData oldData,
2406 AnnotationData newData) {
2407 return unsafe.compareAndSwapObject(clazz, annotationDataOffset, oldData, newData);
2408 }
2409 }
2410
2411 /**
2412 * Reflection support.
2413 */
2414
2415 // Caches for certain reflective results
2416 private static boolean useCaches = true;
2417
2418 // reflection data that might get invalidated when JVM TI RedefineClasses() is called
2419 private static class ReflectionData<T> {
2420 volatile Field[] declaredFields;
2421 volatile Field[] publicFields;
2422 volatile Method[] declaredMethods;
2423 volatile Method[] publicMethods;
2424 volatile Constructor<T>[] declaredConstructors;
2425 volatile Constructor<T>[] publicConstructors;
2426 // Intermediate results for getFields and getMethods
2427 volatile Field[] declaredPublicFields;
2428 volatile Method[] declaredPublicMethods;
2429 volatile Class<?>[] interfaces;
2430
2431 // Value of classRedefinedCount when we created this ReflectionData instance
2432 final int redefinedCount;
2433
2434 ReflectionData(int redefinedCount) {
2435 this.redefinedCount = redefinedCount;
2436 }
2437 }
2438
2439 private volatile transient SoftReference<ReflectionData<T>> reflectionData;
2440
2441 // Incremented by the VM on each call to JVM TI RedefineClasses()
2442 // that redefines this class or a superclass.
2443 private volatile transient int classRedefinedCount = 0;
2444
2445 // Lazily create and cache ReflectionData
2446 private ReflectionData<T> reflectionData() {
2447 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
2448 int classRedefinedCount = this.classRedefinedCount;
2449 ReflectionData<T> rd;
2450 if (useCaches &&
2451 reflectionData != null &&
2452 (rd = reflectionData.get()) != null &&
2453 rd.redefinedCount == classRedefinedCount) {
2454 return rd;
2455 }
2456 // else no SoftReference or cleared SoftReference or stale ReflectionData
2457 // -> create and replace new instance
2458 return newReflectionData(reflectionData, classRedefinedCount);
2459 }
2460
2461 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
2462 int classRedefinedCount) {
2463 if (!useCaches) return null;
2464
2465 while (true) {
2466 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
2467 // try to CAS it...
2468 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
2469 return rd;
2470 }
2471 // else retry
2472 oldReflectionData = this.reflectionData;
2473 classRedefinedCount = this.classRedefinedCount;
2474 if (oldReflectionData != null &&
2475 (rd = oldReflectionData.get()) != null &&
2476 rd.redefinedCount == classRedefinedCount) {
2477 return rd;
2478 }
2479 }
2480 }
2481
2482 // Generic signature handling
2483 private native String getGenericSignature0();
2484
2485 // Generic info repository; lazily initialized
2486 private volatile transient ClassRepository genericInfo;
2487
2488 // accessor for factory
2489 private GenericsFactory getFactory() {
2490 // create scope and factory
2491 return CoreReflectionFactory.make(this, ClassScope.make(this));
2492 }
2493
2494 // accessor for generic info repository;
2495 // generic info is lazily initialized
2496 private ClassRepository getGenericInfo() {
2497 ClassRepository genericInfo = this.genericInfo;
2498 if (genericInfo == null) {
2499 String signature = getGenericSignature0();
2500 if (signature == null) {
2501 genericInfo = ClassRepository.NONE;
2502 } else {
2503 genericInfo = ClassRepository.make(signature, getFactory());
2504 }
2505 this.genericInfo = genericInfo;
2506 }
2507 return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
2508 }
2509
2510 // Annotations handling
2511 native byte[] getRawAnnotations();
2512 // Since 1.8
2513 native byte[] getRawTypeAnnotations();
2514 static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
2515 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
2516 }
2517
2518 native ConstantPool getConstantPool();
2519
2520 //
2521 //
2522 // java.lang.reflect.Field handling
2523 //
2524 //
2525
2526 // Returns an array of "root" fields. These Field objects must NOT
2527 // be propagated to the outside world, but must instead be copied
2528 // via ReflectionFactory.copyField.
2529 private Field[] privateGetDeclaredFields(boolean publicOnly) {
2530 checkInitted();
2531 Field[] res;
2532 ReflectionData<T> rd = reflectionData();
2533 if (rd != null) {
2534 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
2535 if (res != null) return res;
2536 }
2537 // No cached value available; request value from VM
2538 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
2539 if (rd != null) {
2540 if (publicOnly) {
2541 rd.declaredPublicFields = res;
2542 } else {
2543 rd.declaredFields = res;
2544 }
2545 }
2546 return res;
2547 }
2548
2549 // Returns an array of "root" fields. These Field objects must NOT
2550 // be propagated to the outside world, but must instead be copied
2551 // via ReflectionFactory.copyField.
2552 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) {
2553 checkInitted();
2554 Field[] res;
2555 ReflectionData<T> rd = reflectionData();
2556 if (rd != null) {
2557 res = rd.publicFields;
2558 if (res != null) return res;
2559 }
2560
2561 // No cached value available; compute value recursively.
2562 // Traverse in correct order for getField().
2563 List<Field> fields = new ArrayList<>();
2564 if (traversedInterfaces == null) {
2565 traversedInterfaces = new HashSet<>();
2566 }
2567
2568 // Local fields
2569 Field[] tmp = privateGetDeclaredFields(true);
2570 addAll(fields, tmp);
2571
2572 // Direct superinterfaces, recursively
2573 for (Class<?> c : getInterfaces()) {
2574 if (!traversedInterfaces.contains(c)) {
2575 traversedInterfaces.add(c);
2576 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2577 }
2578 }
2579
2580 // Direct superclass, recursively
2581 if (!isInterface()) {
2582 Class<?> c = getSuperclass();
2583 if (c != null) {
2584 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2585 }
2586 }
2587
2588 res = new Field[fields.size()];
2589 fields.toArray(res);
2590 if (rd != null) {
2591 rd.publicFields = res;
2592 }
2593 return res;
2594 }
2595
2596 private static void addAll(Collection<Field> c, Field[] o) {
2597 for (int i = 0; i < o.length; i++) {
2598 c.add(o[i]);
2599 }
2600 }
2601
2602
2603 //
2604 //
2605 // java.lang.reflect.Constructor handling
2606 //
2607 //
2608
2609 // Returns an array of "root" constructors. These Constructor
2610 // objects must NOT be propagated to the outside world, but must
2611 // instead be copied via ReflectionFactory.copyConstructor.
2612 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
2613 checkInitted();
2614 Constructor<T>[] res;
2615 ReflectionData<T> rd = reflectionData();
2616 if (rd != null) {
2617 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
2618 if (res != null) return res;
2619 }
2620 // No cached value available; request value from VM
2621 if (isInterface()) {
2622 @SuppressWarnings("unchecked")
2623 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
2624 res = temporaryRes;
2625 } else {
2626 res = getDeclaredConstructors0(publicOnly);
2627 }
2628 if (rd != null) {
2629 if (publicOnly) {
2630 rd.publicConstructors = res;
2631 } else {
2632 rd.declaredConstructors = res;
2633 }
2634 }
2635 return res;
2636 }
2637
2638 //
2639 //
2640 // java.lang.reflect.Method handling
2641 //
2642 //
2643
2644 // Returns an array of "root" methods. These Method objects must NOT
2645 // be propagated to the outside world, but must instead be copied
2646 // via ReflectionFactory.copyMethod.
2647 private Method[] privateGetDeclaredMethods(boolean publicOnly) {
2648 checkInitted();
2649 Method[] res;
2650 ReflectionData<T> rd = reflectionData();
2651 if (rd != null) {
2652 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
2653 if (res != null) return res;
2654 }
2655 // No cached value available; request value from VM
2656 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
2657 if (rd != null) {
2658 if (publicOnly) {
2659 rd.declaredPublicMethods = res;
2660 } else {
2661 rd.declaredMethods = res;
2662 }
2663 }
2664 return res;
2665 }
2666
2667 static class MethodArray {
2668 private Method[] methods;
2669 private int length;
2670
2671 MethodArray() {
2672 methods = new Method[20];
2673 length = 0;
2674 }
2675
2676 void add(Method m) {
2677 if (length == methods.length) {
2678 methods = Arrays.copyOf(methods, 2 * methods.length);
2679 }
2680 methods[length++] = m;
2681 }
2682
2683 void addAll(Method[] ma) {
2684 for (int i = 0; i < ma.length; i++) {
2685 add(ma[i]);
2686 }
2687 }
2688
2689 void addAll(MethodArray ma) {
2690 for (int i = 0; i < ma.length(); i++) {
2691 add(ma.get(i));
2692 }
2693 }
2694
2695 void addIfNotPresent(Method newMethod) {
2696 for (int i = 0; i < length; i++) {
2697 Method m = methods[i];
2698 if (m == newMethod || (m != null && m.equals(newMethod))) {
2699 return;
2700 }
2701 }
2702 add(newMethod);
2703 }
2704
2705 void addAllIfNotPresent(MethodArray newMethods) {
2706 for (int i = 0; i < newMethods.length(); i++) {
2707 Method m = newMethods.get(i);
2708 if (m != null) {
2709 addIfNotPresent(m);
2710 }
2711 }
2712 }
2713
2714 int length() {
2715 return length;
2716 }
2717
2718 Method get(int i) {
2719 return methods[i];
2720 }
2721
2722 void removeByNameAndSignature(Method toRemove) {
2723 for (int i = 0; i < length; i++) {
2724 Method m = methods[i];
2725 if (m != null &&
2726 m.getReturnType() == toRemove.getReturnType() &&
2727 m.getName() == toRemove.getName() &&
2728 arrayContentsEq(m.getParameterTypes(),
2729 toRemove.getParameterTypes())) {
2730 methods[i] = null;
2731 }
2732 }
2733 }
2734
2735 void compactAndTrim() {
2736 int newPos = 0;
2737 // Get rid of null slots
2738 for (int pos = 0; pos < length; pos++) {
2739 Method m = methods[pos];
2740 if (m != null) {
2741 if (pos != newPos) {
2742 methods[newPos] = m;
2743 }
2744 newPos++;
2745 }
2746 }
2747 if (newPos != methods.length) {
2748 methods = Arrays.copyOf(methods, newPos);
2749 }
2750 }
2751
2752 Method[] getArray() {
2753 return methods;
2754 }
2755 }
2756
2757
2758 // Returns an array of "root" methods. These Method objects must NOT
2759 // be propagated to the outside world, but must instead be copied
2760 // via ReflectionFactory.copyMethod.
2761 private Method[] privateGetPublicMethods() {
2762 checkInitted();
2763 Method[] res;
2764 ReflectionData<T> rd = reflectionData();
2765 if (rd != null) {
2766 res = rd.publicMethods;
2767 if (res != null) return res;
2768 }
2769
2770 // No cached value available; compute value recursively.
2771 // Start by fetching public declared methods
2772 MethodArray methods = new MethodArray();
2773 {
2774 Method[] tmp = privateGetDeclaredMethods(true);
2775 methods.addAll(tmp);
2776 }
2777 // Now recur over superclass and direct superinterfaces.
2778 // Go over superinterfaces first so we can more easily filter
2779 // out concrete implementations inherited from superclasses at
2780 // the end.
2781 MethodArray inheritedMethods = new MethodArray();
2782 Class<?>[] interfaces = getInterfaces();
2783 for (int i = 0; i < interfaces.length; i++) {
2784 inheritedMethods.addAll(interfaces[i].privateGetPublicMethods());
2785 }
2786 if (!isInterface()) {
2787 Class<?> c = getSuperclass();
2788 if (c != null) {
2789 MethodArray supers = new MethodArray();
2790 supers.addAll(c.privateGetPublicMethods());
2791 // Filter out concrete implementations of any
2792 // interface methods
2793 for (int i = 0; i < supers.length(); i++) {
2794 Method m = supers.get(i);
2795 if (m != null && !Modifier.isAbstract(m.getModifiers())) {
2796 inheritedMethods.removeByNameAndSignature(m);
2797 }
2798 }
2799 // Insert superclass's inherited methods before
2800 // superinterfaces' to satisfy getMethod's search
2801 // order
2802 supers.addAll(inheritedMethods);
2803 inheritedMethods = supers;
2804 }
2805 }
2806 // Filter out all local methods from inherited ones
2807 for (int i = 0; i < methods.length(); i++) {
2808 Method m = methods.get(i);
2809 inheritedMethods.removeByNameAndSignature(m);
2810 }
2811 methods.addAllIfNotPresent(inheritedMethods);
2812 methods.compactAndTrim();
2813 res = methods.getArray();
2814 if (rd != null) {
2815 rd.publicMethods = res;
2816 }
2817 return res;
2818 }
2819
2820
2821 //
2822 // Helpers for fetchers of one field, method, or constructor
2823 //
2824
2825 private static Field searchFields(Field[] fields, String name) {
2826 String internedName = name.intern();
2827 for (int i = 0; i < fields.length; i++) {
2828 if (fields[i].getName() == internedName) {
2829 return getReflectionFactory().copyField(fields[i]);
2830 }
2831 }
2832 return null;
2833 }
2834
2835 private Field getField0(String name) throws NoSuchFieldException {
2836 // Note: the intent is that the search algorithm this routine
2837 // uses be equivalent to the ordering imposed by
2838 // privateGetPublicFields(). It fetches only the declared
2839 // public fields for each class, however, to reduce the number
2840 // of Field objects which have to be created for the common
2841 // case where the field being requested is declared in the
2842 // class which is being queried.
2843 Field res;
2844 // Search declared public fields
2845 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
2846 return res;
2847 }
2848 // Direct superinterfaces, recursively
2849 Class<?>[] interfaces = getInterfaces();
2850 for (int i = 0; i < interfaces.length; i++) {
2851 Class<?> c = interfaces[i];
2852 if ((res = c.getField0(name)) != null) {
2853 return res;
2854 }
2855 }
2856 // Direct superclass, recursively
2857 if (!isInterface()) {
2858 Class<?> c = getSuperclass();
2859 if (c != null) {
2860 if ((res = c.getField0(name)) != null) {
2861 return res;
2862 }
2863 }
2864 }
2865 return null;
2866 }
2867
2868 private static Method searchMethods(Method[] methods,
2869 String name,
2870 Class<?>[] parameterTypes)
2871 {
2872 Method res = null;
2873 String internedName = name.intern();
2874 for (int i = 0; i < methods.length; i++) {
2875 Method m = methods[i];
2876 if (m.getName() == internedName
2877 && arrayContentsEq(parameterTypes, m.getParameterTypes())
2878 && (res == null
2879 || res.getReturnType().isAssignableFrom(m.getReturnType())))
2880 res = m;
2881 }
2882
2883 return (res == null ? res : getReflectionFactory().copyMethod(res));
2884 }
2885
2886
2887 private Method getMethod0(String name, Class<?>[] parameterTypes) {
2888 // Note: the intent is that the search algorithm this routine
2889 // uses be equivalent to the ordering imposed by
2890 // privateGetPublicMethods(). It fetches only the declared
2891 // public methods for each class, however, to reduce the
2892 // number of Method objects which have to be created for the
2893 // common case where the method being requested is declared in
2894 // the class which is being queried.
2895 Method res;
2896 // Search declared public methods
2897 if ((res = searchMethods(privateGetDeclaredMethods(true),
2898 name,
2899 parameterTypes)) != null) {
2900 return res;
2901 }
2902 // Search superclass's methods
2903 if (!isInterface()) {
2904 Class<? super T> c = getSuperclass();
2905 if (c != null) {
2906 if ((res = c.getMethod0(name, parameterTypes)) != null) {
2907 return res;
2908 }
2909 }
2910 }
2911 // Search superinterfaces' methods
2912 Class<?>[] interfaces = getInterfaces();
2913 for (int i = 0; i < interfaces.length; i++) {
2914 Class<?> c = interfaces[i];
2915 if ((res = c.getMethod0(name, parameterTypes)) != null) {
2916 return res;
2917 }
2918 }
2919 // Not found
2920 return null;
2921 }
2922
2923 private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
2924 int which) throws NoSuchMethodException
2925 {
2926 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
2927 for (Constructor<T> constructor : constructors) {
2928 if (arrayContentsEq(parameterTypes,
2929 constructor.getParameterTypes())) {
2930 return getReflectionFactory().copyConstructor(constructor);
2931 }
2932 }
2933 throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes));
2934 }
2935
2936 //
2937 // Other helpers and base implementation
2938 //
2939
2940 private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
2941 if (a1 == null) {
2942 return a2 == null || a2.length == 0;
2943 }
2944
2945 if (a2 == null) {
2946 return a1.length == 0;
2947 }
2948
2949 if (a1.length != a2.length) {
2950 return false;
2951 }
2952
2953 for (int i = 0; i < a1.length; i++) {
2954 if (a1[i] != a2[i]) {
2955 return false;
2956 }
2957 }
2958
2959 return true;
2960 }
2961
2962 private static Field[] copyFields(Field[] arg) {
2963 Field[] out = new Field[arg.length];
2964 ReflectionFactory fact = getReflectionFactory();
2965 for (int i = 0; i < arg.length; i++) {
2966 out[i] = fact.copyField(arg[i]);
2967 }
2968 return out;
2969 }
2970
2971 private static Method[] copyMethods(Method[] arg) {
2972 Method[] out = new Method[arg.length];
2973 ReflectionFactory fact = getReflectionFactory();
2974 for (int i = 0; i < arg.length; i++) {
2975 out[i] = fact.copyMethod(arg[i]);
2976 }
2977 return out;
2978 }
2979
2980 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
2981 Constructor<U>[] out = arg.clone();
2982 ReflectionFactory fact = getReflectionFactory();
2983 for (int i = 0; i < out.length; i++) {
2984 out[i] = fact.copyConstructor(out[i]);
2985 }
2986 return out;
2987 }
2988
2989 private native Field[] getDeclaredFields0(boolean publicOnly);
2990 private native Method[] getDeclaredMethods0(boolean publicOnly);
2991 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
2992 private native Class<?>[] getDeclaredClasses0();
2993
2994 private static String argumentTypesToString(Class<?>[] argTypes) {
2995 StringBuilder buf = new StringBuilder();
2996 buf.append("(");
2997 if (argTypes != null) {
2998 for (int i = 0; i < argTypes.length; i++) {
2999 if (i > 0) {
3000 buf.append(", ");
3001 }
3002 Class<?> c = argTypes[i];
3003 buf.append((c == null) ? "null" : c.getName());
3004 }
3005 }
3006 buf.append(")");
3007 return buf.toString();
3008 }
3009
3010 /** use serialVersionUID from JDK 1.1 for interoperability */
3011 private static final long serialVersionUID = 3206093459760846163L;
3012
3013
3014 /**
3015 * Class Class is special cased within the Serialization Stream Protocol.
3016 *
3017 * A Class instance is written initially into an ObjectOutputStream in the
3018 * following format:
3019 * <pre>
3020 * {@code TC_CLASS} ClassDescriptor
3021 * A ClassDescriptor is a special cased serialization of
3022 * a {@code java.io.ObjectStreamClass} instance.
3023 * </pre>
3024 * A new handle is generated for the initial time the class descriptor
3025 * is written into the stream. Future references to the class descriptor
3026 * are written as references to the initial class descriptor instance.
3027 *
3028 * @see java.io.ObjectStreamClass
3029 */
3030 private static final ObjectStreamField[] serialPersistentFields =
3031 new ObjectStreamField[0];
3032
3033
3034 /**
3035 * Returns the assertion status that would be assigned to this
3036 * class if it were to be initialized at the time this method is invoked.
3037 * If this class has had its assertion status set, the most recent
3038 * setting will be returned; otherwise, if any package default assertion
3039 * status pertains to this class, the most recent setting for the most
3040 * specific pertinent package default assertion status is returned;
3041 * otherwise, if this class is not a system class (i.e., it has a
3042 * class loader) its class loader's default assertion status is returned;
3043 * otherwise, the system class default assertion status is returned.
3044 * <p>
3045 * Few programmers will have any need for this method; it is provided
3046 * for the benefit of the JRE itself. (It allows a class to determine at
3047 * the time that it is initialized whether assertions should be enabled.)
3048 * Note that this method is not guaranteed to return the actual
3049 * assertion status that was (or will be) associated with the specified
3050 * class when it was (or will be) initialized.
3051 *
3052 * @return the desired assertion status of the specified class.
3053 * @see java.lang.ClassLoader#setClassAssertionStatus
3054 * @see java.lang.ClassLoader#setPackageAssertionStatus
3055 * @see java.lang.ClassLoader#setDefaultAssertionStatus
3056 * @since 1.4
3057 */
3058 public boolean desiredAssertionStatus() {
3059 ClassLoader loader = getClassLoader();
3060 // If the loader is null this is a system class, so ask the VM
3061 if (loader == null)
3062 return desiredAssertionStatus0(this);
3063
3064 // If the classloader has been initialized with the assertion
3065 // directives, ask it. Otherwise, ask the VM.
3066 synchronized(loader.assertionLock) {
3067 if (loader.classAssertionStatus != null) {
3068 return loader.desiredAssertionStatus(getName());
3069 }
3070 }
3071 return desiredAssertionStatus0(this);
3072 }
3073
3074 // Retrieves the desired assertion status of this class from the VM
3075 private static native boolean desiredAssertionStatus0(Class<?> clazz);
3076
3077 /**
3078 * Returns true if and only if this class was declared as an enum in the
3079 * source code.
3080 *
3081 * @return true if and only if this class was declared as an enum in the
3082 * source code
3083 * @since 1.5
3084 */
3085 public boolean isEnum() {
3086 // An enum must both directly extend java.lang.Enum and have
3087 // the ENUM bit set; classes for specialized enum constants
3088 // don't do the former.
3089 return (this.getModifiers() & ENUM) != 0 &&
3090 this.getSuperclass() == java.lang.Enum.class;
3091 }
3092
3093 // Fetches the factory for reflective objects
3094 private static ReflectionFactory getReflectionFactory() {
3095 if (reflectionFactory == null) {
3096 reflectionFactory =
3097 java.security.AccessController.doPrivileged
3098 (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction());
3099 }
3100 return reflectionFactory;
3101 }
3102 private static ReflectionFactory reflectionFactory;
3103
3104 // To be able to query system properties as soon as they're available
3105 private static boolean initted = false;
3106 private static void checkInitted() {
3107 if (initted) return;
3108 AccessController.doPrivileged(new PrivilegedAction<Void>() {
3109 public Void run() {
3110 // Tests to ensure the system properties table is fully
3111 // initialized. This is needed because reflection code is
3112 // called very early in the initialization process (before
3113 // command-line arguments have been parsed and therefore
3114 // these user-settable properties installed.) We assume that
3115 // if System.out is non-null then the System class has been
3116 // fully initialized and that the bulk of the startup code
3117 // has been run.
3118
3119 if (System.out == null) {
3120 // java.lang.System not yet fully initialized
3121 return null;
3122 }
3123
3124 // Doesn't use Boolean.getBoolean to avoid class init.
3125 String val =
3126 System.getProperty("sun.reflect.noCaches");
3127 if (val != null && val.equals("true")) {
3128 useCaches = false;
3129 }
3130
3131 initted = true;
3132 return null;
3133 }
3134 });
3135 }
3136
3137 /**
3138 * Returns the elements of this enum class or null if this
3139 * Class object does not represent an enum type.
3140 *
3141 * @return an array containing the values comprising the enum class
3142 * represented by this Class object in the order they're
3143 * declared, or null if this Class object does not
3144 * represent an enum type
3145 * @since 1.5
3146 */
3147 public T[] getEnumConstants() {
3148 T[] values = getEnumConstantsShared();
3149 return (values != null) ? values.clone() : null;
3150 }
3151
3152 /**
3153 * Returns the elements of this enum class or null if this
3154 * Class object does not represent an enum type;
3155 * identical to getEnumConstants except that the result is
3156 * uncloned, cached, and shared by all callers.
3157 */
3158 T[] getEnumConstantsShared() {
3159 if (enumConstants == null) {
3160 if (!isEnum()) return null;
3161 try {
3162 final Method values = getMethod("values");
3163 java.security.AccessController.doPrivileged(
3164 new java.security.PrivilegedAction<Void>() {
3165 public Void run() {
3166 values.setAccessible(true);
3167 return null;
3168 }
3169 });
3170 @SuppressWarnings("unchecked")
3171 T[] temporaryConstants = (T[])values.invoke(null);
3172 enumConstants = temporaryConstants;
3173 }
3174 // These can happen when users concoct enum-like classes
3175 // that don't comply with the enum spec.
3176 catch (InvocationTargetException | NoSuchMethodException |
3177 IllegalAccessException ex) { return null; }
3178 }
3179 return enumConstants;
3180 }
3181 private volatile transient T[] enumConstants = null;
3182
3183 /**
3184 * Returns a map from simple name to enum constant. This package-private
3185 * method is used internally by Enum to implement
3186 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
3187 * efficiently. Note that the map is returned by this method is
3188 * created lazily on first use. Typically it won't ever get created.
3189 */
3190 Map<String, T> enumConstantDirectory() {
3191 if (enumConstantDirectory == null) {
3192 T[] universe = getEnumConstantsShared();
3193 if (universe == null)
3194 throw new IllegalArgumentException(
3195 getName() + " is not an enum type");
3196 Map<String, T> m = new HashMap<>(2 * universe.length);
3197 for (T constant : universe)
3198 m.put(((Enum<?>)constant).name(), constant);
3199 enumConstantDirectory = m;
3200 }
3201 return enumConstantDirectory;
3202 }
3203 private volatile transient Map<String, T> enumConstantDirectory = null;
3204
3205 /**
3206 * Casts an object to the class or interface represented
3207 * by this {@code Class} object.
3208 *
3209 * @param obj the object to be cast
3210 * @return the object after casting, or null if obj is null
3211 *
3212 * @throws ClassCastException if the object is not
3213 * null and is not assignable to the type T.
3214 *
3215 * @since 1.5
3216 */
3217 @SuppressWarnings("unchecked")
3218 public T cast(Object obj) {
3219 if (obj != null && !isInstance(obj))
3220 throw new ClassCastException(cannotCastMsg(obj));
3221 return (T) obj;
3222 }
3223
3224 private String cannotCastMsg(Object obj) {
3225 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3226 }
3227
3228 /**
3229 * Casts this {@code Class} object to represent a subclass of the class
3230 * represented by the specified class object. Checks that the cast
3231 * is valid, and throws a {@code ClassCastException} if it is not. If
3232 * this method succeeds, it always returns a reference to this class object.
3233 *
3234 * <p>This method is useful when a client needs to "narrow" the type of
3235 * a {@code Class} object to pass it to an API that restricts the
3236 * {@code Class} objects that it is willing to accept. A cast would
3237 * generate a compile-time warning, as the correctness of the cast
3238 * could not be checked at runtime (because generic types are implemented
3239 * by erasure).
3240 *
3241 * @param <U> the type to cast this class object to
3242 * @param clazz the class of the type to cast this class object to
3243 * @return this {@code Class} object, cast to represent a subclass of
3244 * the specified class object.
3245 * @throws ClassCastException if this {@code Class} object does not
3246 * represent a subclass of the specified class (here "subclass" includes
3247 * the class itself).
3248 * @since 1.5
3249 */
3250 @SuppressWarnings("unchecked")
3251 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3252 if (clazz.isAssignableFrom(this))
3253 return (Class<? extends U>) this;
3254 else
3255 throw new ClassCastException(this.toString());
3256 }
3257
3258 /**
3259 * @throws NullPointerException {@inheritDoc}
3260 * @since 1.5
3261 */
3262 @SuppressWarnings("unchecked")
3263 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3264 Objects.requireNonNull(annotationClass);
3265
3266 return (A) annotationData().annotations.get(annotationClass);
3267 }
3268
3269 /**
3270 * {@inheritDoc}
3271 * @throws NullPointerException {@inheritDoc}
3272 * @since 1.5
3273 */
3274 @Override
3275 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3276 return GenericDeclaration.super.isAnnotationPresent(annotationClass);
3277 }
3278
3279 /**
3280 * @throws NullPointerException {@inheritDoc}
3281 * @since 1.8
3282 */
3283 @Override
3284 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
3285 Objects.requireNonNull(annotationClass);
3286
3287 return AnnotationSupport.getMultipleAnnotations(annotationData().annotations, annotationClass);
3288 }
3289
3290 /**
3291 * @since 1.5
3292 */
3293 public Annotation[] getAnnotations() {
3294 return AnnotationParser.toArray(annotationData().annotations);
3295 }
3296
3297 /**
3298 * @throws NullPointerException {@inheritDoc}
3299 * @since 1.8
3300 */
3301 @Override
3302 @SuppressWarnings("unchecked")
3303 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3304 Objects.requireNonNull(annotationClass);
3305
3306 return (A) annotationData().declaredAnnotations.get(annotationClass);
3307 }
3308
3309 /**
3310 * @throws NullPointerException {@inheritDoc}
3311 * @since 1.8
3312 */
3313 @Override
3314 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
3315 Objects.requireNonNull(annotationClass);
3316
3317 return AnnotationSupport.getMultipleAnnotations(annotationData().declaredAnnotations, annotationClass);
3318 }
3319
3320 /**
3321 * @since 1.5
3322 */
3323 public Annotation[] getDeclaredAnnotations() {
3324 return AnnotationParser.toArray(annotationData().declaredAnnotations);
3325 }
3326
3327 // annotation data that might get invalidated when JVM TI RedefineClasses() is called
3328 private static class AnnotationData {
3329 final Map<Class<? extends Annotation>, Annotation> annotations;
3330 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3331
3332 // Value of classRedefinedCount when we created this AnnotationData instance
3333 final int redefinedCount;
3334
3335 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
3336 Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
3337 int redefinedCount) {
3338 this.annotations = annotations;
3339 this.declaredAnnotations = declaredAnnotations;
3340 this.redefinedCount = redefinedCount;
3341 }
3342 }
3343
3344 // Annotations cache
3345 @SuppressWarnings("UnusedDeclaration")
3346 private volatile transient AnnotationData annotationData;
3347
3348 private AnnotationData annotationData() {
3349 while (true) { // retry loop
3350 AnnotationData annotationData = this.annotationData;
3351 int classRedefinedCount = this.classRedefinedCount;
3352 if (annotationData != null &&
3353 annotationData.redefinedCount == classRedefinedCount) {
3354 return annotationData;
3355 }
3356 // null or stale annotationData -> optimistically create new instance
3357 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
3358 // try to install it
3359 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
3360 // successfully installed new AnnotationData
3361 return newAnnotationData;
3362 }
3363 }
3364 }
3365
3366 private AnnotationData createAnnotationData(int classRedefinedCount) {
3367 Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
3368 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
3369 Class<?> superClass = getSuperclass();
3370 Map<Class<? extends Annotation>, Annotation> annotations = null;
3371 if (superClass != null) {
3372 Map<Class<? extends Annotation>, Annotation> superAnnotations =
3373 superClass.annotationData().annotations;
3374 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
3375 Class<? extends Annotation> annotationClass = e.getKey();
3376 if (AnnotationType.getInstance(annotationClass).isInherited()) {
3377 if (annotations == null) { // lazy construction
3378 annotations = new LinkedHashMap<>((Math.max(
3379 declaredAnnotations.size(),
3380 Math.min(12, declaredAnnotations.size() + superAnnotations.size())
3381 ) * 4 + 2) / 3
3382 );
3383 }
3384 annotations.put(annotationClass, e.getValue());
3385 }
3386 }
3387 }
3388 if (annotations == null) {
3389 // no inherited annotations -> share the Map with declaredAnnotations
3390 annotations = declaredAnnotations;
3391 } else {
3392 // at least one inherited annotation -> declared may override inherited
3393 annotations.putAll(declaredAnnotations);
3394 }
3395 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
3396 }
3397
3398 // Annotation types cache their internal (AnnotationType) form
3399
3400 @SuppressWarnings("UnusedDeclaration")
3401 private volatile transient AnnotationType annotationType;
3402
3403 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
3404 return Atomic.casAnnotationType(this, oldType, newType);
3405 }
3406
3407 AnnotationType getAnnotationType() {
3408 return annotationType;
3409 }
3410
3411 /* Backing store of user-defined values pertaining to this class.
3412 * Maintained by the ClassValue class.
3413 */
3414 transient ClassValue.ClassValueMap classValueMap;
3415
3416 /**
3417 * Returns an {@code AnnotatedType} object that represents the use of a
3418 * type to specify the superclass of the entity represented by this {@code
3419 * Class} object. (The <em>use</em> of type Foo to specify the superclass
3420 * in '... extends Foo' is distinct from the <em>declaration</em> of type
3421 * Foo.)
3422 *
3423 * <p> If this {@code Class} object represents a type whose declaration
3424 * does not explicitly indicate an annotated superclass, then the return
3425 * value is an {@code AnnotatedType} object representing an element with no
3426 * annotations.
3427 *
3428 * <p> If this {@code Class} represents either the {@code Object} class, an
3429 * interface type, an array type, a primitive type, or void, the return
3430 * value is {@code null}.
3431 *
3432 * @return an object representing the superclass
3433 * @since 1.8
3434 */
3435 public AnnotatedType getAnnotatedSuperclass() {
3436 if (this == Object.class ||
3437 isInterface() ||
3438 isArray() ||
3439 isPrimitive() ||
3440 this == Void.TYPE) {
3441 return null;
3442 }
3443
3444 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
3445 }
3446
3447 /**
3448 * Returns an array of {@code AnnotatedType} objects that represent the use
3449 * of types to specify superinterfaces of the entity represented by this
3450 * {@code Class} object. (The <em>use</em> of type Foo to specify a
3451 * superinterface in '... implements Foo' is distinct from the
3452 * <em>declaration</em> of type Foo.)
3453 *
3454 * <p> If this {@code Class} object represents a class, the return value is
3455 * an array containing objects representing the uses of interface types to
3456 * specify interfaces implemented by the class. The order of the objects in
3457 * the array corresponds to the order of the interface types used in the
3458 * 'implements' clause of the declaration of this {@code Class} object.
3459 *
3460 * <p> If this {@code Class} object represents an interface, the return
3461 * value is an array containing objects representing the uses of interface
3462 * types to specify interfaces directly extended by the interface. The
3463 * order of the objects in the array corresponds to the order of the
3464 * interface types used in the 'extends' clause of the declaration of this
3465 * {@code Class} object.
3466 *
3467 * <p> If this {@code Class} object represents a class or interface whose
3468 * declaration does not explicitly indicate any annotated superinterfaces,
3469 * the return value is an array of length 0.
3470 *
3471 * <p> If this {@code Class} object represents either the {@code Object}
3472 * class, an array type, a primitive type, or void, the return value is an
3473 * array of length 0.
3474 *
3475 * @return an array representing the superinterfaces
3476 * @since 1.8
3477 */
3478 public AnnotatedType[] getAnnotatedInterfaces() {
3479 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
3480 }
3481 }