1 /*
2 * Copyright (c) 1994, 2014, 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 java.util.StringJoiner;
58 import sun.misc.Unsafe;
59 import sun.reflect.CallerSensitive;
60 import sun.reflect.ConstantPool;
61 import sun.reflect.Reflection;
62 import sun.reflect.ReflectionFactory;
63 import sun.reflect.generics.factory.CoreReflectionFactory;
64 import sun.reflect.generics.factory.GenericsFactory;
65 import sun.reflect.generics.repository.ClassRepository;
66 import sun.reflect.generics.repository.MethodRepository;
67 import sun.reflect.generics.repository.ConstructorRepository;
68 import sun.reflect.generics.scope.ClassScope;
69 import sun.security.util.SecurityConstants;
70
71 import java.lang.annotation.Annotation;
72 import java.lang.reflect.Proxy;
73
74 import sun.reflect.annotation.*;
75 import sun.reflect.misc.ReflectUtil;
76
77 /**
78 * Instances of the class {@code Class} represent classes and
79 * interfaces in a running Java application. An enum is a kind of
80 * class and an annotation is a kind of interface. Every array also
81 * belongs to a class that is reflected as a {@code Class} object
82 * that is shared by all arrays with the same element type and number
83 * of dimensions. The primitive Java types ({@code boolean},
84 * {@code byte}, {@code char}, {@code short},
85 * {@code int}, {@code long}, {@code float}, and
86 * {@code double}), and the keyword {@code void} are also
87 * represented as {@code Class} objects.
88 *
89 * <p> {@code Class} has no public constructor. Instead {@code Class}
90 * objects are constructed automatically by the Java Virtual Machine as classes
91 * are loaded and by calls to the {@code defineClass} method in the class
92 * loader.
93 *
94 * <p> The following example uses a {@code Class} object to print the
95 * class name of an object:
96 *
97 * <blockquote><pre>
98 * void printClassName(Object obj) {
99 * System.out.println("The class of " + obj +
100 * " is " + obj.getClass().getName());
101 * }
102 * </pre></blockquote>
103 *
104 * <p> It is also possible to get the {@code Class} object for a named
105 * type (or for void) using a class literal. See Section 15.8.2 of
106 * <cite>The Java™ Language Specification</cite>.
107 * For example:
108 *
109 * <blockquote>
110 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
111 * </blockquote>
112 *
113 * @param <T> the type of the class modeled by this {@code Class}
114 * object. For example, the type of {@code String.class} is {@code
115 * Class<String>}. Use {@code Class<?>} if the class being modeled is
116 * unknown.
117 *
118 * @author unascribed
119 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
120 * @since 1.0
121 */
122 public final class Class<T> implements java.io.Serializable,
123 GenericDeclaration,
124 Type,
125 AnnotatedElement {
126 private static final int ANNOTATION= 0x00002000;
127 private static final int ENUM = 0x00004000;
128 private static final int SYNTHETIC = 0x00001000;
129
130 private static native void registerNatives();
131 static {
132 registerNatives();
133 }
134
135 /*
136 * Private constructor. Only the Java Virtual Machine creates Class objects.
137 * This constructor is not used and prevents the default constructor being
138 * generated.
139 */
140 private Class(ClassLoader loader, Class<?> arrayComponentType) {
141 // Initialize final field for classLoader. The initialization value of non-null
142 // prevents future JIT optimizations from assuming this final field is null.
143 classLoader = loader;
144 componentType = arrayComponentType;
145 }
146
147 /**
148 * Converts the object to a string. The string representation is the
149 * string "class" or "interface", followed by a space, and then by the
150 * fully qualified name of the class in the format returned by
151 * {@code getName}. If this {@code Class} object represents a
152 * primitive type, this method returns the name of the primitive type. If
153 * this {@code Class} object represents void this method returns
154 * "void".
155 *
156 * @return a string representation of this class object.
157 */
158 public String toString() {
159 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
160 + getName();
161 }
162
163 /**
164 * Returns a string describing this {@code Class}, including
165 * information about modifiers and type parameters.
166 *
167 * The string is formatted as a list of type modifiers, if any,
168 * followed by the kind of type (empty string for primitive types
169 * and {@code class}, {@code enum}, {@code interface}, or
170 * <code>@</code>{@code interface}, as appropriate), followed
171 * by the type's name, followed by an angle-bracketed
172 * comma-separated list of the type's type parameters, if any.
173 *
174 * A space is used to separate modifiers from one another and to
175 * separate any modifiers from the kind of type. The modifiers
176 * occur in canonical order. If there are no type parameters, the
177 * type parameter list is elided.
178 *
179 * <p>Note that since information about the runtime representation
180 * of a type is being generated, modifiers not present on the
181 * originating source code or illegal on the originating source
182 * code may be present.
183 *
184 * @return a string describing this {@code Class}, including
185 * information about modifiers and type parameters
186 *
187 * @since 1.8
188 */
189 public String toGenericString() {
190 if (isPrimitive()) {
191 return toString();
192 } else {
193 StringBuilder sb = new StringBuilder();
194
195 // Class modifiers are a superset of interface modifiers
196 int modifiers = getModifiers() & Modifier.classModifiers();
197 if (modifiers != 0) {
198 sb.append(Modifier.toString(modifiers));
199 sb.append(' ');
200 }
201
202 if (isAnnotation()) {
203 sb.append('@');
204 }
205 if (isInterface()) { // Note: all annotation types are interfaces
206 sb.append("interface");
207 } else {
208 if (isEnum())
209 sb.append("enum");
210 else
211 sb.append("class");
212 }
213 sb.append(' ');
214 sb.append(getName());
215
216 TypeVariable<?>[] typeparms = getTypeParameters();
217 if (typeparms.length > 0) {
218 boolean first = true;
219 sb.append('<');
220 for(TypeVariable<?> typeparm: typeparms) {
221 if (!first)
222 sb.append(',');
223 sb.append(typeparm.getTypeName());
224 first = false;
225 }
226 sb.append('>');
227 }
228
229 return sb.toString();
230 }
231 }
232
233 /**
234 * Returns the {@code Class} object associated with the class or
235 * interface with the given string name. Invoking this method is
236 * equivalent to:
237 *
238 * <blockquote>
239 * {@code Class.forName(className, true, currentLoader)}
240 * </blockquote>
241 *
242 * where {@code currentLoader} denotes the defining class loader of
243 * the current class.
244 *
245 * <p> For example, the following code fragment returns the
246 * runtime {@code Class} descriptor for the class named
247 * {@code java.lang.Thread}:
248 *
249 * <blockquote>
250 * {@code Class t = Class.forName("java.lang.Thread")}
251 * </blockquote>
252 * <p>
253 * A call to {@code forName("X")} causes the class named
254 * {@code X} to be initialized.
255 *
256 * @param className the fully qualified name of the desired class.
257 * @return the {@code Class} object for the class with the
258 * specified name.
259 * @exception LinkageError if the linkage fails
260 * @exception ExceptionInInitializerError if the initialization provoked
261 * by this method fails
262 * @exception ClassNotFoundException if the class cannot be located
263 */
264 @CallerSensitive
265 public static Class<?> forName(String className)
266 throws ClassNotFoundException {
267 Class<?> caller = Reflection.getCallerClass();
268 return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
269 }
270
271
272 /**
273 * Returns the {@code Class} object associated with the class or
274 * interface with the given string name, using the given class loader.
275 * Given the fully qualified name for a class or interface (in the same
276 * format returned by {@code getName}) this method attempts to
277 * locate, load, and link the class or interface. The specified class
278 * loader is used to load the class or interface. If the parameter
279 * {@code loader} is null, the class is loaded through the bootstrap
280 * class loader. The class is initialized only if the
281 * {@code initialize} parameter is {@code true} and if it has
282 * not been initialized earlier.
283 *
284 * <p> If {@code name} denotes a primitive type or void, an attempt
285 * will be made to locate a user-defined class in the unnamed package whose
286 * name is {@code name}. Therefore, this method cannot be used to
287 * obtain any of the {@code Class} objects representing primitive
288 * types or void.
289 *
290 * <p> If {@code name} denotes an array class, the component type of
291 * the array class is loaded but not initialized.
292 *
293 * <p> For example, in an instance method the expression:
294 *
295 * <blockquote>
296 * {@code Class.forName("Foo")}
297 * </blockquote>
298 *
299 * is equivalent to:
300 *
301 * <blockquote>
302 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
303 * </blockquote>
304 *
305 * Note that this method throws errors related to loading, linking or
306 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
307 * Java Language Specification</em>.
308 * Note that this method does not check whether the requested class
309 * is accessible to its caller.
310 *
311 * <p> If the {@code loader} is {@code null}, and a security
312 * manager is present, and the caller's class loader is not null, then this
313 * method calls the security manager's {@code checkPermission} method
314 * with a {@code RuntimePermission("getClassLoader")} permission to
315 * ensure it's ok to access the bootstrap class loader.
316 *
317 * @param name fully qualified name of the desired class
318 * @param initialize if {@code true} the class will be initialized.
319 * See Section 12.4 of <em>The Java Language Specification</em>.
320 * @param loader class loader from which the class must be loaded
321 * @return class object representing the desired class
322 *
323 * @exception LinkageError if the linkage fails
324 * @exception ExceptionInInitializerError if the initialization provoked
325 * by this method fails
326 * @exception ClassNotFoundException if the class cannot be located by
327 * the specified class loader
328 *
329 * @see java.lang.Class#forName(String)
330 * @see java.lang.ClassLoader
331 * @since 1.2
332 */
333 @CallerSensitive
334 public static Class<?> forName(String name, boolean initialize,
335 ClassLoader loader)
336 throws ClassNotFoundException
337 {
338 Class<?> caller = null;
339 SecurityManager sm = System.getSecurityManager();
340 if (sm != null) {
341 // Reflective call to get caller class is only needed if a security manager
342 // is present. Avoid the overhead of making this call otherwise.
343 caller = Reflection.getCallerClass();
344 if (sun.misc.VM.isSystemDomainLoader(loader)) {
345 ClassLoader ccl = ClassLoader.getClassLoader(caller);
346 if (!sun.misc.VM.isSystemDomainLoader(ccl)) {
347 sm.checkPermission(
348 SecurityConstants.GET_CLASSLOADER_PERMISSION);
349 }
350 }
351 }
352 return forName0(name, initialize, loader, caller);
353 }
354
355 /** Called after security check for system loader access checks have been made. */
356 private static native Class<?> forName0(String name, boolean initialize,
357 ClassLoader loader,
358 Class<?> caller)
359 throws ClassNotFoundException;
360
361 /**
362 * Creates a new instance of the class represented by this {@code Class}
363 * object. The class is instantiated as if by a {@code new}
364 * expression with an empty argument list. The class is initialized if it
365 * has not already been initialized.
366 *
367 * <p>Note that this method propagates any exception thrown by the
368 * nullary constructor, including a checked exception. Use of
369 * this method effectively bypasses the compile-time exception
370 * checking that would otherwise be performed by the compiler.
371 * The {@link
372 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
373 * Constructor.newInstance} method avoids this problem by wrapping
374 * any exception thrown by the constructor in a (checked) {@link
375 * java.lang.reflect.InvocationTargetException}.
376 *
377 * @return a newly allocated instance of the class represented by this
378 * object.
379 * @throws IllegalAccessException if the class or its nullary
380 * constructor is not accessible.
381 * @throws InstantiationException
382 * if this {@code Class} represents an abstract class,
383 * an interface, an array class, a primitive type, or void;
384 * or if the class has no nullary constructor;
385 * or if the instantiation fails for some other reason.
386 * @throws ExceptionInInitializerError if the initialization
387 * provoked by this method fails.
388 * @throws SecurityException
389 * If a security manager, <i>s</i>, is present and
390 * the caller's class loader is not the same as or an
391 * ancestor of the class loader for the current class and
392 * invocation of {@link SecurityManager#checkPackageAccess
393 * s.checkPackageAccess()} denies access to the package
394 * of this class.
395 */
396 @CallerSensitive
397 public T newInstance()
398 throws InstantiationException, IllegalAccessException
399 {
400 if (System.getSecurityManager() != null) {
401 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
402 }
403
404 // NOTE: the following code may not be strictly correct under
405 // the current Java memory model.
406
407 // Constructor lookup
408 if (cachedConstructor == null) {
409 if (this == Class.class) {
410 throw new IllegalAccessException(
411 "Can not call newInstance() on the Class for java.lang.Class"
412 );
413 }
414 try {
415 Class<?>[] empty = {};
416 final Constructor<T> c = getConstructor0(empty, Member.DECLARED);
417 // Disable accessibility checks on the constructor
418 // since we have to do the security check here anyway
419 // (the stack depth is wrong for the Constructor's
420 // security check to work)
421 java.security.AccessController.doPrivileged(
422 new java.security.PrivilegedAction<Void>() {
423 public Void run() {
424 c.setAccessible(true);
425 return null;
426 }
427 });
428 cachedConstructor = c;
429 } catch (NoSuchMethodException e) {
430 throw (InstantiationException)
431 new InstantiationException(getName()).initCause(e);
432 }
433 }
434 Constructor<T> tmpConstructor = cachedConstructor;
435 // Security check (same as in java.lang.reflect.Constructor)
436 int modifiers = tmpConstructor.getModifiers();
437 if (!Reflection.quickCheckMemberAccess(this, modifiers)) {
438 Class<?> caller = Reflection.getCallerClass();
439 if (newInstanceCallerCache != caller) {
440 Reflection.ensureMemberAccess(caller, this, null, modifiers);
441 newInstanceCallerCache = caller;
442 }
443 }
444 // Run constructor
445 try {
446 return tmpConstructor.newInstance((Object[])null);
447 } catch (InvocationTargetException e) {
448 Unsafe.getUnsafe().throwException(e.getTargetException());
449 // Not reached
450 return null;
451 }
452 }
453 private volatile transient Constructor<T> cachedConstructor;
454 private volatile transient Class<?> newInstanceCallerCache;
455
456
457 /**
458 * Determines if the specified {@code Object} is assignment-compatible
459 * with the object represented by this {@code Class}. This method is
460 * the dynamic equivalent of the Java language {@code instanceof}
461 * operator. The method returns {@code true} if the specified
462 * {@code Object} argument is non-null and can be cast to the
463 * reference type represented by this {@code Class} object without
464 * raising a {@code ClassCastException.} It returns {@code false}
465 * otherwise.
466 *
467 * <p> Specifically, if this {@code Class} object represents a
468 * declared class, this method returns {@code true} if the specified
469 * {@code Object} argument is an instance of the represented class (or
470 * of any of its subclasses); it returns {@code false} otherwise. If
471 * this {@code Class} object represents an array class, this method
472 * returns {@code true} if the specified {@code Object} argument
473 * can be converted to an object of the array class by an identity
474 * conversion or by a widening reference conversion; it returns
475 * {@code false} otherwise. If this {@code Class} object
476 * represents an interface, this method returns {@code true} if the
477 * class or any superclass of the specified {@code Object} argument
478 * implements this interface; it returns {@code false} otherwise. If
479 * this {@code Class} object represents a primitive type, this method
480 * returns {@code false}.
481 *
482 * @param obj the object to check
483 * @return true if {@code obj} is an instance of this class
484 *
485 * @since 1.1
486 */
487 public native boolean isInstance(Object obj);
488
489
490 /**
491 * Determines if the class or interface represented by this
492 * {@code Class} object is either the same as, or is a superclass or
493 * superinterface of, the class or interface represented by the specified
494 * {@code Class} parameter. It returns {@code true} if so;
495 * otherwise it returns {@code false}. If this {@code Class}
496 * object represents a primitive type, this method returns
497 * {@code true} if the specified {@code Class} parameter is
498 * exactly this {@code Class} object; otherwise it returns
499 * {@code false}.
500 *
501 * <p> Specifically, this method tests whether the type represented by the
502 * specified {@code Class} parameter can be converted to the type
503 * represented by this {@code Class} object via an identity conversion
504 * or via a widening reference conversion. See <em>The Java Language
505 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
506 *
507 * @param cls the {@code Class} object to be checked
508 * @return the {@code boolean} value indicating whether objects of the
509 * type {@code cls} can be assigned to objects of this class
510 * @exception NullPointerException if the specified Class parameter is
511 * null.
512 * @since 1.1
513 */
514 public native boolean isAssignableFrom(Class<?> cls);
515
516
517 /**
518 * Determines if the specified {@code Class} object represents an
519 * interface type.
520 *
521 * @return {@code true} if this object represents an interface;
522 * {@code false} otherwise.
523 */
524 public native boolean isInterface();
525
526
527 /**
528 * Determines if this {@code Class} object represents an array class.
529 *
530 * @return {@code true} if this object represents an array class;
531 * {@code false} otherwise.
532 * @since 1.1
533 */
534 public native boolean isArray();
535
536
537 /**
538 * Determines if the specified {@code Class} object represents a
539 * primitive type.
540 *
541 * <p> There are nine predefined {@code Class} objects to represent
542 * the eight primitive types and void. These are created by the Java
543 * Virtual Machine, and have the same names as the primitive types that
544 * they represent, namely {@code boolean}, {@code byte},
545 * {@code char}, {@code short}, {@code int},
546 * {@code long}, {@code float}, and {@code double}.
547 *
548 * <p> These objects may only be accessed via the following public static
549 * final variables, and are the only {@code Class} objects for which
550 * this method returns {@code true}.
551 *
552 * @return true if and only if this class represents a primitive type
553 *
554 * @see java.lang.Boolean#TYPE
555 * @see java.lang.Character#TYPE
556 * @see java.lang.Byte#TYPE
557 * @see java.lang.Short#TYPE
558 * @see java.lang.Integer#TYPE
559 * @see java.lang.Long#TYPE
560 * @see java.lang.Float#TYPE
561 * @see java.lang.Double#TYPE
562 * @see java.lang.Void#TYPE
563 * @since 1.1
564 */
565 public native boolean isPrimitive();
566
567 /**
568 * Returns true if this {@code Class} object represents an annotation
569 * type. Note that if this method returns true, {@link #isInterface()}
570 * would also return true, as all annotation types are also interfaces.
571 *
572 * @return {@code true} if this class object represents an annotation
573 * type; {@code false} otherwise
574 * @since 1.5
575 */
576 public boolean isAnnotation() {
577 return (getModifiers() & ANNOTATION) != 0;
578 }
579
580 /**
581 * Returns {@code true} if this class is a synthetic class;
582 * returns {@code false} otherwise.
583 * @return {@code true} if and only if this class is a synthetic class as
584 * defined by the Java Language Specification.
585 * @jls 13.1 The Form of a Binary
586 * @since 1.5
587 */
588 public boolean isSynthetic() {
589 return (getModifiers() & SYNTHETIC) != 0;
590 }
591
592 /**
593 * Returns the name of the entity (class, interface, array class,
594 * primitive type, or void) represented by this {@code Class} object,
595 * as a {@code String}.
596 *
597 * <p> If this class object represents a reference type that is not an
598 * array type then the binary name of the class is returned, as specified
599 * by
600 * <cite>The Java™ Language Specification</cite>.
601 *
602 * <p> If this class object represents a primitive type or void, then the
603 * name returned is a {@code String} equal to the Java language
604 * keyword corresponding to the primitive type or void.
605 *
606 * <p> If this class object represents a class of arrays, then the internal
607 * form of the name consists of the name of the element type preceded by
608 * one or more '{@code [}' characters representing the depth of the array
609 * nesting. The encoding of element type names is as follows:
610 *
611 * <blockquote><table summary="Element types and encodings">
612 * <tr><th> Element Type <th> <th> Encoding
613 * <tr><td> boolean <td> <td align=center> Z
614 * <tr><td> byte <td> <td align=center> B
615 * <tr><td> char <td> <td align=center> C
616 * <tr><td> class or interface
617 * <td> <td align=center> L<i>classname</i>;
618 * <tr><td> double <td> <td align=center> D
619 * <tr><td> float <td> <td align=center> F
620 * <tr><td> int <td> <td align=center> I
621 * <tr><td> long <td> <td align=center> J
622 * <tr><td> short <td> <td align=center> S
623 * </table></blockquote>
624 *
625 * <p> The class or interface name <i>classname</i> is the binary name of
626 * the class specified above.
627 *
628 * <p> Examples:
629 * <blockquote><pre>
630 * String.class.getName()
631 * returns "java.lang.String"
632 * byte.class.getName()
633 * returns "byte"
634 * (new Object[3]).getClass().getName()
635 * returns "[Ljava.lang.Object;"
636 * (new int[3][4][5][6][7][8][9]).getClass().getName()
637 * returns "[[[[[[[I"
638 * </pre></blockquote>
639 *
640 * @return the name of the class or interface
641 * represented by this object.
642 */
643 public String getName() {
644 String name = this.name;
645 if (name == null)
646 this.name = name = getName0();
647 return name;
648 }
649
650 // cache the name to reduce the number of calls into the VM
651 private transient String name;
652 private native String getName0();
653
654 /**
655 * Returns the class loader for the class. Some implementations may use
656 * null to represent the bootstrap class loader. This method will return
657 * null in such implementations if this class was loaded by the bootstrap
658 * class loader.
659 *
660 * <p> If a security manager is present, and the caller's class loader is
661 * not null and the caller's class loader is not the same as or an ancestor of
662 * the class loader for the class whose class loader is requested, then
663 * this method calls the security manager's {@code checkPermission}
664 * method with a {@code RuntimePermission("getClassLoader")}
665 * permission to ensure it's ok to access the class loader for the class.
666 *
667 * <p>If this object
668 * represents a primitive type or void, null is returned.
669 *
670 * @return the class loader that loaded the class or interface
671 * represented by this object.
672 * @throws SecurityException
673 * if a security manager exists and its
674 * {@code checkPermission} method denies
675 * access to the class loader for the class.
676 * @see java.lang.ClassLoader
677 * @see SecurityManager#checkPermission
678 * @see java.lang.RuntimePermission
679 */
680 @CallerSensitive
681 public ClassLoader getClassLoader() {
682 ClassLoader cl = getClassLoader0();
683 if (cl == null)
684 return null;
685 SecurityManager sm = System.getSecurityManager();
686 if (sm != null) {
687 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
688 }
689 return cl;
690 }
691
692 // Package-private to allow ClassLoader access
693 ClassLoader getClassLoader0() { return classLoader; }
694
695 // Initialized in JVM not by private constructor
696 private final ClassLoader classLoader;
697
698 /**
699 * Returns an array of {@code TypeVariable} objects that represent the
700 * type variables declared by the generic declaration represented by this
701 * {@code GenericDeclaration} object, in declaration order. Returns an
702 * array of length 0 if the underlying generic declaration declares no type
703 * variables.
704 *
705 * @return an array of {@code TypeVariable} objects that represent
706 * the type variables declared by this generic declaration
707 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
708 * signature of this generic declaration does not conform to
709 * the format specified in
710 * <cite>The Java™ Virtual Machine Specification</cite>
711 * @since 1.5
712 */
713 @SuppressWarnings("unchecked")
714 public TypeVariable<Class<T>>[] getTypeParameters() {
715 ClassRepository info = getGenericInfo();
716 if (info != null)
717 return (TypeVariable<Class<T>>[])info.getTypeParameters();
718 else
719 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
720 }
721
722
723 /**
724 * Returns the {@code Class} representing the superclass of the entity
725 * (class, interface, primitive type or void) represented by this
726 * {@code Class}. If this {@code Class} represents either the
727 * {@code Object} class, an interface, a primitive type, or void, then
728 * null is returned. If this object represents an array class then the
729 * {@code Class} object representing the {@code Object} class is
730 * returned.
731 *
732 * @return the superclass of the class represented by this object.
733 */
734 public native Class<? super T> getSuperclass();
735
736
737 /**
738 * Returns the {@code Type} representing the direct superclass of
739 * the entity (class, interface, primitive type or void) represented by
740 * this {@code Class}.
741 *
742 * <p>If the superclass is a parameterized type, the {@code Type}
743 * object returned must accurately reflect the actual type
744 * parameters used in the source code. The parameterized type
745 * representing the superclass is created if it had not been
746 * created before. See the declaration of {@link
747 * java.lang.reflect.ParameterizedType ParameterizedType} for the
748 * semantics of the creation process for parameterized types. If
749 * this {@code Class} represents either the {@code Object}
750 * class, an interface, a primitive type, or void, then null is
751 * returned. If this object represents an array class then the
752 * {@code Class} object representing the {@code Object} class is
753 * returned.
754 *
755 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
756 * class signature does not conform to the format specified in
757 * <cite>The Java™ Virtual Machine Specification</cite>
758 * @throws TypeNotPresentException if the generic superclass
759 * refers to a non-existent type declaration
760 * @throws java.lang.reflect.MalformedParameterizedTypeException if the
761 * generic superclass refers to a parameterized type that cannot be
762 * instantiated for any reason
763 * @return the superclass of the class represented by this object
764 * @since 1.5
765 */
766 public Type getGenericSuperclass() {
767 ClassRepository info = getGenericInfo();
768 if (info == null) {
769 return getSuperclass();
770 }
771
772 // Historical irregularity:
773 // Generic signature marks interfaces with superclass = Object
774 // but this API returns null for interfaces
775 if (isInterface()) {
776 return null;
777 }
778
779 return info.getSuperclass();
780 }
781
782 /**
783 * Gets the package for this class. The class loader of this class is used
784 * to find the package. If the class was loaded by the bootstrap class
785 * loader the set of packages loaded from CLASSPATH is searched to find the
786 * package of the class. Null is returned if no package object was created
787 * by the class loader of this class.
788 *
789 * <p> Packages have attributes for versions and specifications only if the
790 * information was defined in the manifests that accompany the classes, and
791 * if the class loader created the package instance with the attributes
792 * from the manifest.
793 *
794 * @return the package of the class, or null if no package
795 * information is available from the archive or codebase.
796 */
797 public Package getPackage() {
798 return Package.getPackage(this);
799 }
800
801
802 /**
803 * Determines the interfaces implemented by the class or interface
804 * represented by this object.
805 *
806 * <p> If this object represents a class, the return value is an array
807 * containing objects representing all interfaces implemented by the
808 * class. The order of the interface objects in the array corresponds to
809 * the order of the interface names in the {@code implements} clause
810 * of the declaration of the class represented by this object. For
811 * example, given the declaration:
812 * <blockquote>
813 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
814 * </blockquote>
815 * suppose the value of {@code s} is an instance of
816 * {@code Shimmer}; the value of the expression:
817 * <blockquote>
818 * {@code s.getClass().getInterfaces()[0]}
819 * </blockquote>
820 * is the {@code Class} object that represents interface
821 * {@code FloorWax}; and the value of:
822 * <blockquote>
823 * {@code s.getClass().getInterfaces()[1]}
824 * </blockquote>
825 * is the {@code Class} object that represents interface
826 * {@code DessertTopping}.
827 *
828 * <p> If this object represents an interface, the array contains objects
829 * representing all interfaces extended by the interface. The order of the
830 * interface objects in the array corresponds to the order of the interface
831 * names in the {@code extends} clause of the declaration of the
832 * interface represented by this object.
833 *
834 * <p> If this object represents a class or interface that implements no
835 * interfaces, the method returns an array of length 0.
836 *
837 * <p> If this object represents a primitive type or void, the method
838 * returns an array of length 0.
839 *
840 * <p> If this {@code Class} object represents an array type, the
841 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
842 * returned in that order.
843 *
844 * @return an array of interfaces implemented by this class.
845 */
846 public Class<?>[] getInterfaces() {
847 ReflectionData<T> rd = reflectionData();
848 if (rd == null) {
849 // no cloning required
850 return getInterfaces0();
851 } else {
852 Class<?>[] interfaces = rd.interfaces;
853 if (interfaces == null) {
854 interfaces = getInterfaces0();
855 rd.interfaces = interfaces;
856 }
857 // defensively copy before handing over to user code
858 return interfaces.clone();
859 }
860 }
861
862 private native Class<?>[] getInterfaces0();
863
864 /**
865 * Returns the {@code Type}s representing the interfaces
866 * directly implemented by the class or interface represented by
867 * this object.
868 *
869 * <p>If a superinterface is a parameterized type, the
870 * {@code Type} object returned for it must accurately reflect
871 * the actual type parameters used in the source code. The
872 * parameterized type representing each superinterface is created
873 * if it had not been created before. See the declaration of
874 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
875 * for the semantics of the creation process for parameterized
876 * types.
877 *
878 * <p> If this object represents a class, the return value is an
879 * array containing objects representing all interfaces
880 * implemented by the class. The order of the interface objects in
881 * the array corresponds to the order of the interface names in
882 * the {@code implements} clause of the declaration of the class
883 * represented by this object. In the case of an array class, the
884 * interfaces {@code Cloneable} and {@code Serializable} are
885 * returned in that order.
886 *
887 * <p>If this object represents an interface, the array contains
888 * objects representing all interfaces directly extended by the
889 * interface. The order of the interface objects in the array
890 * corresponds to the order of the interface names in the
891 * {@code extends} clause of the declaration of the interface
892 * represented by this object.
893 *
894 * <p>If this object represents a class or interface that
895 * implements no interfaces, the method returns an array of length
896 * 0.
897 *
898 * <p>If this object represents a primitive type or void, the
899 * method returns an array of length 0.
900 *
901 * @throws java.lang.reflect.GenericSignatureFormatError
902 * if the generic class signature does not conform to the format
903 * specified in
904 * <cite>The Java™ Virtual Machine Specification</cite>
905 * @throws TypeNotPresentException if any of the generic
906 * superinterfaces refers to a non-existent type declaration
907 * @throws java.lang.reflect.MalformedParameterizedTypeException
908 * if any of the generic superinterfaces refer to a parameterized
909 * type that cannot be instantiated for any reason
910 * @return an array of interfaces implemented by this class
911 * @since 1.5
912 */
913 public Type[] getGenericInterfaces() {
914 ClassRepository info = getGenericInfo();
915 return (info == null) ? getInterfaces() : info.getSuperInterfaces();
916 }
917
918
919 /**
920 * Returns the {@code Class} representing the component type of an
921 * array. If this class does not represent an array class this method
922 * returns null.
923 *
924 * @return the {@code Class} representing the component type of this
925 * class if this class is an array
926 * @see java.lang.reflect.Array
927 * @since 1.1
928 */
929 public Class<?> getComponentType() {
930 // Only return for array types. Storage may be reused for Class for instance types.
931 if (isArray()) {
932 return componentType;
933 } else {
934 return null;
935 }
936 }
937
938 private final Class<?> componentType;
939
940
941 /**
942 * Returns the Java language modifiers for this class or interface, encoded
943 * in an integer. The modifiers consist of the Java Virtual Machine's
944 * constants for {@code public}, {@code protected},
945 * {@code private}, {@code final}, {@code static},
946 * {@code abstract} and {@code interface}; they should be decoded
947 * using the methods of class {@code Modifier}.
948 *
949 * <p> If the underlying class is an array class, then its
950 * {@code public}, {@code private} and {@code protected}
951 * modifiers are the same as those of its component type. If this
952 * {@code Class} represents a primitive type or void, its
953 * {@code public} modifier is always {@code true}, and its
954 * {@code protected} and {@code private} modifiers are always
955 * {@code false}. If this object represents an array class, a
956 * primitive type or void, then its {@code final} modifier is always
957 * {@code true} and its interface modifier is always
958 * {@code false}. The values of its other modifiers are not determined
959 * by this specification.
960 *
961 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
962 * Specification</em>, table 4.1.
963 *
964 * @return the {@code int} representing the modifiers for this class
965 * @see java.lang.reflect.Modifier
966 * @since 1.1
967 */
968 public native int getModifiers();
969
970
971 /**
972 * Gets the signers of this class.
973 *
974 * @return the signers of this class, or null if there are no signers. In
975 * particular, this method returns null if this object represents
976 * a primitive type or void.
977 * @since 1.1
978 */
979 public native Object[] getSigners();
980
981
982 /**
983 * Set the signers of this class.
984 */
985 native void setSigners(Object[] signers);
986
987
988 /**
989 * If this {@code Class} object represents a local or anonymous
990 * class within a method, returns a {@link
991 * java.lang.reflect.Method Method} object representing the
992 * immediately enclosing method of the underlying class. Returns
993 * {@code null} otherwise.
994 *
995 * In particular, this method returns {@code null} if the underlying
996 * class is a local or anonymous class immediately enclosed by a type
997 * declaration, instance initializer or static initializer.
998 *
999 * @return the immediately enclosing method of the underlying class, if
1000 * that class is a local or anonymous class; otherwise {@code null}.
1001 *
1002 * @throws SecurityException
1003 * If a security manager, <i>s</i>, is present and any of the
1004 * following conditions is met:
1005 *
1006 * <ul>
1007 *
1008 * <li> the caller's class loader is not the same as the
1009 * class loader of the enclosing class and invocation of
1010 * {@link SecurityManager#checkPermission
1011 * s.checkPermission} method with
1012 * {@code RuntimePermission("accessDeclaredMembers")}
1013 * denies access to the methods within the enclosing class
1014 *
1015 * <li> the caller's class loader is not the same as or an
1016 * ancestor of the class loader for the enclosing class and
1017 * invocation of {@link SecurityManager#checkPackageAccess
1018 * s.checkPackageAccess()} denies access to the package
1019 * of the enclosing class
1020 *
1021 * </ul>
1022 * @since 1.5
1023 */
1024 @CallerSensitive
1025 public Method getEnclosingMethod() throws SecurityException {
1026 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1027
1028 if (enclosingInfo == null)
1029 return null;
1030 else {
1031 if (!enclosingInfo.isMethod())
1032 return null;
1033
1034 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
1035 getFactory());
1036 Class<?> returnType = toClass(typeInfo.getReturnType());
1037 Type [] parameterTypes = typeInfo.getParameterTypes();
1038 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1039
1040 // Convert Types to Classes; returned types *should*
1041 // be class objects since the methodDescriptor's used
1042 // don't have generics information
1043 for(int i = 0; i < parameterClasses.length; i++)
1044 parameterClasses[i] = toClass(parameterTypes[i]);
1045
1046 // Perform access check
1047 Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1048 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1049 Reflection.getCallerClass(), true);
1050 /*
1051 * Loop over all declared methods; match method name,
1052 * number of and type of parameters, *and* return
1053 * type. Matching return type is also necessary
1054 * because of covariant returns, etc.
1055 */
1056 for(Method m: enclosingCandidate.getDeclaredMethods()) {
1057 if (m.getName().equals(enclosingInfo.getName()) ) {
1058 Class<?>[] candidateParamClasses = m.getParameterTypes();
1059 if (candidateParamClasses.length == parameterClasses.length) {
1060 boolean matches = true;
1061 for(int i = 0; i < candidateParamClasses.length; i++) {
1062 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1063 matches = false;
1064 break;
1065 }
1066 }
1067
1068 if (matches) { // finally, check return type
1069 if (m.getReturnType().equals(returnType) )
1070 return m;
1071 }
1072 }
1073 }
1074 }
1075
1076 throw new InternalError("Enclosing method not found");
1077 }
1078 }
1079
1080 private native Object[] getEnclosingMethod0();
1081
1082 private EnclosingMethodInfo getEnclosingMethodInfo() {
1083 Object[] enclosingInfo = getEnclosingMethod0();
1084 if (enclosingInfo == null)
1085 return null;
1086 else {
1087 return new EnclosingMethodInfo(enclosingInfo);
1088 }
1089 }
1090
1091 private final static class EnclosingMethodInfo {
1092 private Class<?> enclosingClass;
1093 private String name;
1094 private String descriptor;
1095
1096 private EnclosingMethodInfo(Object[] enclosingInfo) {
1097 if (enclosingInfo.length != 3)
1098 throw new InternalError("Malformed enclosing method information");
1099 try {
1100 // The array is expected to have three elements:
1101
1102 // the immediately enclosing class
1103 enclosingClass = (Class<?>) enclosingInfo[0];
1104 assert(enclosingClass != null);
1105
1106 // the immediately enclosing method or constructor's
1107 // name (can be null).
1108 name = (String) enclosingInfo[1];
1109
1110 // the immediately enclosing method or constructor's
1111 // descriptor (null iff name is).
1112 descriptor = (String) enclosingInfo[2];
1113 assert((name != null && descriptor != null) || name == descriptor);
1114 } catch (ClassCastException cce) {
1115 throw new InternalError("Invalid type in enclosing method information", cce);
1116 }
1117 }
1118
1119 boolean isPartial() {
1120 return enclosingClass == null || name == null || descriptor == null;
1121 }
1122
1123 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
1124
1125 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
1126
1127 Class<?> getEnclosingClass() { return enclosingClass; }
1128
1129 String getName() { return name; }
1130
1131 String getDescriptor() { return descriptor; }
1132
1133 }
1134
1135 private static Class<?> toClass(Type o) {
1136 if (o instanceof GenericArrayType)
1137 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1138 0)
1139 .getClass();
1140 return (Class<?>)o;
1141 }
1142
1143 /**
1144 * If this {@code Class} object represents a local or anonymous
1145 * class within a constructor, returns a {@link
1146 * java.lang.reflect.Constructor Constructor} object representing
1147 * the immediately enclosing constructor of the underlying
1148 * class. Returns {@code null} otherwise. In particular, this
1149 * method returns {@code null} if the underlying class is a local
1150 * or anonymous class immediately enclosed by a type declaration,
1151 * instance initializer or static initializer.
1152 *
1153 * @return the immediately enclosing constructor of the underlying class, if
1154 * that class is a local or anonymous class; otherwise {@code null}.
1155 * @throws SecurityException
1156 * If a security manager, <i>s</i>, is present and any of the
1157 * following conditions is met:
1158 *
1159 * <ul>
1160 *
1161 * <li> the caller's class loader is not the same as the
1162 * class loader of the enclosing class and invocation of
1163 * {@link SecurityManager#checkPermission
1164 * s.checkPermission} method with
1165 * {@code RuntimePermission("accessDeclaredMembers")}
1166 * denies access to the constructors within the enclosing class
1167 *
1168 * <li> the caller's class loader is not the same as or an
1169 * ancestor of the class loader for the enclosing class and
1170 * invocation of {@link SecurityManager#checkPackageAccess
1171 * s.checkPackageAccess()} denies access to the package
1172 * of the enclosing class
1173 *
1174 * </ul>
1175 * @since 1.5
1176 */
1177 @CallerSensitive
1178 public Constructor<?> getEnclosingConstructor() throws SecurityException {
1179 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1180
1181 if (enclosingInfo == null)
1182 return null;
1183 else {
1184 if (!enclosingInfo.isConstructor())
1185 return null;
1186
1187 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1188 getFactory());
1189 Type [] parameterTypes = typeInfo.getParameterTypes();
1190 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1191
1192 // Convert Types to Classes; returned types *should*
1193 // be class objects since the methodDescriptor's used
1194 // don't have generics information
1195 for(int i = 0; i < parameterClasses.length; i++)
1196 parameterClasses[i] = toClass(parameterTypes[i]);
1197
1198 // Perform access check
1199 Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1200 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1201 Reflection.getCallerClass(), true);
1202 /*
1203 * Loop over all declared constructors; match number
1204 * of and type of parameters.
1205 */
1206 for(Constructor<?> c: enclosingCandidate.getDeclaredConstructors()) {
1207 Class<?>[] candidateParamClasses = c.getParameterTypes();
1208 if (candidateParamClasses.length == parameterClasses.length) {
1209 boolean matches = true;
1210 for(int i = 0; i < candidateParamClasses.length; i++) {
1211 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1212 matches = false;
1213 break;
1214 }
1215 }
1216
1217 if (matches)
1218 return c;
1219 }
1220 }
1221
1222 throw new InternalError("Enclosing constructor not found");
1223 }
1224 }
1225
1226
1227 /**
1228 * If the class or interface represented by this {@code Class} object
1229 * is a member of another class, returns the {@code Class} object
1230 * representing the class in which it was declared. This method returns
1231 * null if this class or interface is not a member of any other class. If
1232 * this {@code Class} object represents an array class, a primitive
1233 * type, or void,then this method returns null.
1234 *
1235 * @return the declaring class for this class
1236 * @throws SecurityException
1237 * If a security manager, <i>s</i>, is present and the caller's
1238 * class loader is not the same as or an ancestor of the class
1239 * loader for the declaring class and invocation of {@link
1240 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1241 * denies access to the package of the declaring class
1242 * @since 1.1
1243 */
1244 @CallerSensitive
1245 public Class<?> getDeclaringClass() throws SecurityException {
1246 final Class<?> candidate = getDeclaringClass0();
1247
1248 if (candidate != null)
1249 candidate.checkPackageAccess(
1250 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1251 return candidate;
1252 }
1253
1254 private native Class<?> getDeclaringClass0();
1255
1256
1257 /**
1258 * Returns the immediately enclosing class of the underlying
1259 * class. If the underlying class is a top level class this
1260 * method returns {@code null}.
1261 * @return the immediately enclosing class of the underlying class
1262 * @exception SecurityException
1263 * If a security manager, <i>s</i>, is present and the caller's
1264 * class loader is not the same as or an ancestor of the class
1265 * loader for the enclosing class and invocation of {@link
1266 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1267 * denies access to the package of the enclosing class
1268 * @since 1.5
1269 */
1270 @CallerSensitive
1271 public Class<?> getEnclosingClass() throws SecurityException {
1272 // There are five kinds of classes (or interfaces):
1273 // a) Top level classes
1274 // b) Nested classes (static member classes)
1275 // c) Inner classes (non-static member classes)
1276 // d) Local classes (named classes declared within a method)
1277 // e) Anonymous classes
1278
1279
1280 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1281 // attribute if and only if it is a local class or an
1282 // anonymous class.
1283 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1284 Class<?> enclosingCandidate;
1285
1286 if (enclosingInfo == null) {
1287 // This is a top level or a nested class or an inner class (a, b, or c)
1288 enclosingCandidate = getDeclaringClass();
1289 } else {
1290 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1291 // This is a local class or an anonymous class (d or e)
1292 if (enclosingClass == this || enclosingClass == null)
1293 throw new InternalError("Malformed enclosing method information");
1294 else
1295 enclosingCandidate = enclosingClass;
1296 }
1297
1298 if (enclosingCandidate != null)
1299 enclosingCandidate.checkPackageAccess(
1300 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1301 return enclosingCandidate;
1302 }
1303
1304 /**
1305 * Returns the simple name of the underlying class as given in the
1306 * source code. Returns an empty string if the underlying class is
1307 * anonymous.
1308 *
1309 * <p>The simple name of an array is the simple name of the
1310 * component type with "[]" appended. In particular the simple
1311 * name of an array whose component type is anonymous is "[]".
1312 *
1313 * @return the simple name of the underlying class
1314 * @since 1.5
1315 */
1316 public String getSimpleName() {
1317 if (isArray())
1318 return getComponentType().getSimpleName()+"[]";
1319
1320 String simpleName = getSimpleBinaryName();
1321 if (simpleName == null) { // top level class
1322 simpleName = getName();
1323 return simpleName.substring(simpleName.lastIndexOf('.')+1); // strip the package name
1324 }
1325 // According to JLS3 "Binary Compatibility" (13.1) the binary
1326 // name of non-package classes (not top level) is the binary
1327 // name of the immediately enclosing class followed by a '$' followed by:
1328 // (for nested and inner classes): the simple name.
1329 // (for local classes): 1 or more digits followed by the simple name.
1330 // (for anonymous classes): 1 or more digits.
1331
1332 // Since getSimpleBinaryName() will strip the binary name of
1333 // the immediately enclosing class, we are now looking at a
1334 // string that matches the regular expression "\$[0-9]*"
1335 // followed by a simple name (considering the simple of an
1336 // anonymous class to be the empty string).
1337
1338 // Remove leading "\$[0-9]*" from the name
1339 int length = simpleName.length();
1340 if (length < 1 || simpleName.charAt(0) != '$')
1341 throw new InternalError("Malformed class name");
1342 int index = 1;
1343 while (index < length && isAsciiDigit(simpleName.charAt(index)))
1344 index++;
1345 // Eventually, this is the empty string iff this is an anonymous class
1346 return simpleName.substring(index);
1347 }
1348
1349 /**
1350 * Return an informative string for the name of this type.
1351 *
1352 * @return an informative string for the name of this type
1353 * @since 1.8
1354 */
1355 public String getTypeName() {
1356 if (isArray()) {
1357 try {
1358 Class<?> cl = this;
1359 int dimensions = 0;
1360 while (cl.isArray()) {
1361 dimensions++;
1362 cl = cl.getComponentType();
1363 }
1364 StringBuilder sb = new StringBuilder();
1365 sb.append(cl.getName());
1366 for (int i = 0; i < dimensions; i++) {
1367 sb.append("[]");
1368 }
1369 return sb.toString();
1370 } catch (Throwable e) { /*FALLTHRU*/ }
1371 }
1372 return getName();
1373 }
1374
1375 /**
1376 * Character.isDigit answers {@code true} to some non-ascii
1377 * digits. This one does not.
1378 */
1379 private static boolean isAsciiDigit(char c) {
1380 return '0' <= c && c <= '9';
1381 }
1382
1383 /**
1384 * Returns the canonical name of the underlying class as
1385 * defined by the Java Language Specification. Returns null if
1386 * the underlying class does not have a canonical name (i.e., if
1387 * it is a local or anonymous class or an array whose component
1388 * type does not have a canonical name).
1389 * @return the canonical name of the underlying class if it exists, and
1390 * {@code null} otherwise.
1391 * @since 1.5
1392 */
1393 public String getCanonicalName() {
1394 if (isArray()) {
1395 String canonicalName = getComponentType().getCanonicalName();
1396 if (canonicalName != null)
1397 return canonicalName + "[]";
1398 else
1399 return null;
1400 }
1401 if (isLocalOrAnonymousClass())
1402 return null;
1403 Class<?> enclosingClass = getEnclosingClass();
1404 if (enclosingClass == null) { // top level class
1405 return getName();
1406 } else {
1407 String enclosingName = enclosingClass.getCanonicalName();
1408 if (enclosingName == null)
1409 return null;
1410 return enclosingName + "." + getSimpleName();
1411 }
1412 }
1413
1414 /**
1415 * Returns {@code true} if and only if the underlying class
1416 * is an anonymous class.
1417 *
1418 * @return {@code true} if and only if this class is an anonymous class.
1419 * @since 1.5
1420 */
1421 public boolean isAnonymousClass() {
1422 return "".equals(getSimpleName());
1423 }
1424
1425 /**
1426 * Returns {@code true} if and only if the underlying class
1427 * is a local class.
1428 *
1429 * @return {@code true} if and only if this class is a local class.
1430 * @since 1.5
1431 */
1432 public boolean isLocalClass() {
1433 return isLocalOrAnonymousClass() && !isAnonymousClass();
1434 }
1435
1436 /**
1437 * Returns {@code true} if and only if the underlying class
1438 * is a member class.
1439 *
1440 * @return {@code true} if and only if this class is a member class.
1441 * @since 1.5
1442 */
1443 public boolean isMemberClass() {
1444 return getSimpleBinaryName() != null && !isLocalOrAnonymousClass();
1445 }
1446
1447 /**
1448 * Returns the "simple binary name" of the underlying class, i.e.,
1449 * the binary name without the leading enclosing class name.
1450 * Returns {@code null} if the underlying class is a top level
1451 * class.
1452 */
1453 private String getSimpleBinaryName() {
1454 Class<?> enclosingClass = getEnclosingClass();
1455 if (enclosingClass == null) // top level class
1456 return null;
1457 // Otherwise, strip the enclosing class' name
1458 try {
1459 return getName().substring(enclosingClass.getName().length());
1460 } catch (IndexOutOfBoundsException ex) {
1461 throw new InternalError("Malformed class name", ex);
1462 }
1463 }
1464
1465 /**
1466 * Returns {@code true} if this is a local class or an anonymous
1467 * class. Returns {@code false} otherwise.
1468 */
1469 private boolean isLocalOrAnonymousClass() {
1470 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1471 // attribute if and only if it is a local class or an
1472 // anonymous class.
1473 return getEnclosingMethodInfo() != null;
1474 }
1475
1476 /**
1477 * Returns an array containing {@code Class} objects representing all
1478 * the public classes and interfaces that are members of the class
1479 * represented by this {@code Class} object. This includes public
1480 * class and interface members inherited from superclasses and public class
1481 * and interface members declared by the class. This method returns an
1482 * array of length 0 if this {@code Class} object has no public member
1483 * classes or interfaces. This method also returns an array of length 0 if
1484 * this {@code Class} object represents a primitive type, an array
1485 * class, or void.
1486 *
1487 * @return the array of {@code Class} objects representing the public
1488 * members of this class
1489 * @throws SecurityException
1490 * If a security manager, <i>s</i>, is present and
1491 * the caller's class loader is not the same as or an
1492 * ancestor of the class loader for the current class and
1493 * invocation of {@link SecurityManager#checkPackageAccess
1494 * s.checkPackageAccess()} denies access to the package
1495 * of this class.
1496 *
1497 * @since 1.1
1498 */
1499 @CallerSensitive
1500 public Class<?>[] getClasses() {
1501 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
1502
1503 // Privileged so this implementation can look at DECLARED classes,
1504 // something the caller might not have privilege to do. The code here
1505 // is allowed to look at DECLARED classes because (1) it does not hand
1506 // out anything other than public members and (2) public member access
1507 // has already been ok'd by the SecurityManager.
1508
1509 return java.security.AccessController.doPrivileged(
1510 new java.security.PrivilegedAction<Class<?>[]>() {
1511 public Class<?>[] run() {
1512 List<Class<?>> list = new ArrayList<>();
1513 Class<?> currentClass = Class.this;
1514 while (currentClass != null) {
1515 for (Class<?> m : currentClass.getDeclaredClasses()) {
1516 if (Modifier.isPublic(m.getModifiers())) {
1517 list.add(m);
1518 }
1519 }
1520 currentClass = currentClass.getSuperclass();
1521 }
1522 return list.toArray(new Class<?>[0]);
1523 }
1524 });
1525 }
1526
1527
1528 /**
1529 * Returns an array containing {@code Field} objects reflecting all
1530 * the accessible public fields of the class or interface represented by
1531 * this {@code Class} object.
1532 *
1533 * <p> If this {@code Class} object represents a class or interface with no
1534 * no accessible public fields, then this method returns an array of length
1535 * 0.
1536 *
1537 * <p> If this {@code Class} object represents a class, then this method
1538 * returns the public fields of the class and of all its superclasses.
1539 *
1540 * <p> If this {@code Class} object represents an interface, then this
1541 * method returns the fields of the interface and of all its
1542 * superinterfaces.
1543 *
1544 * <p> If this {@code Class} object represents an array type, a primitive
1545 * type, or void, then this method returns an array of length 0.
1546 *
1547 * <p> The elements in the returned array are not sorted and are not in any
1548 * particular order.
1549 *
1550 * @return the array of {@code Field} objects representing the
1551 * public fields
1552 * @throws SecurityException
1553 * If a security manager, <i>s</i>, is present and
1554 * the caller's class loader is not the same as or an
1555 * ancestor of the class loader for the current class and
1556 * invocation of {@link SecurityManager#checkPackageAccess
1557 * s.checkPackageAccess()} denies access to the package
1558 * of this class.
1559 *
1560 * @since 1.1
1561 * @jls 8.2 Class Members
1562 * @jls 8.3 Field Declarations
1563 */
1564 @CallerSensitive
1565 public Field[] getFields() throws SecurityException {
1566 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1567 return copyFields(privateGetPublicFields(null));
1568 }
1569
1570
1571 /**
1572 * Returns an array containing {@code Method} objects reflecting all the
1573 * public methods of the class or interface represented by this {@code
1574 * Class} object, including those declared by the class or interface and
1575 * those inherited from superclasses and superinterfaces.
1576 *
1577 * <p> If this {@code Class} object represents a type that has multiple
1578 * public methods with the same name and parameter types, but different
1579 * return types, then the returned array has a {@code Method} object for
1580 * each such method.
1581 *
1582 * <p> If this {@code Class} object represents a type with a class
1583 * initialization method {@code <clinit>}, then the returned array does
1584 * <em>not</em> have a corresponding {@code Method} object.
1585 *
1586 * <p> If this {@code Class} object represents an array type, then the
1587 * returned array has a {@code Method} object for each of the public
1588 * methods inherited by the array type from {@code Object}. It does not
1589 * contain a {@code Method} object for {@code clone()}.
1590 *
1591 * <p> If this {@code Class} object represents an interface then the
1592 * returned array does not contain any implicitly declared methods from
1593 * {@code Object}. Therefore, if no methods are explicitly declared in
1594 * this interface or any of its superinterfaces then the returned array
1595 * has length 0. (Note that a {@code Class} object which represents a class
1596 * always has public methods, inherited from {@code Object}.)
1597 *
1598 * <p> If this {@code Class} object represents a primitive type or void,
1599 * then the returned array has length 0.
1600 *
1601 * <p> Static methods declared in superinterfaces of the class or interface
1602 * represented by this {@code Class} object are not considered members of
1603 * the class or interface.
1604 *
1605 * <p> The elements in the returned array are not sorted and are not in any
1606 * particular order.
1607 *
1608 * @return the array of {@code Method} objects representing the
1609 * public methods of this class
1610 * @throws SecurityException
1611 * If a security manager, <i>s</i>, is present and
1612 * the caller's class loader is not the same as or an
1613 * ancestor of the class loader for the current class and
1614 * invocation of {@link SecurityManager#checkPackageAccess
1615 * s.checkPackageAccess()} denies access to the package
1616 * of this class.
1617 *
1618 * @jls 8.2 Class Members
1619 * @jls 8.4 Method Declarations
1620 * @since 1.1
1621 */
1622 @CallerSensitive
1623 public Method[] getMethods() throws SecurityException {
1624 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1625 return copyMethods(privateGetPublicMethods());
1626 }
1627
1628
1629 /**
1630 * Returns an array containing {@code Constructor} objects reflecting
1631 * all the public constructors of the class represented by this
1632 * {@code Class} object. An array of length 0 is returned if the
1633 * class has no public constructors, or if the class is an array class, or
1634 * if the class reflects a primitive type or void.
1635 *
1636 * Note that while this method returns an array of {@code
1637 * Constructor<T>} objects (that is an array of constructors from
1638 * this class), the return type of this method is {@code
1639 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1640 * might be expected. This less informative return type is
1641 * necessary since after being returned from this method, the
1642 * array could be modified to hold {@code Constructor} objects for
1643 * different classes, which would violate the type guarantees of
1644 * {@code Constructor<T>[]}.
1645 *
1646 * @return the array of {@code Constructor} objects representing the
1647 * public constructors of this class
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 1.1
1657 */
1658 @CallerSensitive
1659 public Constructor<?>[] getConstructors() throws SecurityException {
1660 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1661 return copyConstructors(privateGetDeclaredConstructors(true));
1662 }
1663
1664
1665 /**
1666 * Returns a {@code Field} object that reflects the specified public member
1667 * field of the class or interface represented by this {@code Class}
1668 * object. The {@code name} parameter is a {@code String} specifying the
1669 * simple name of the desired field.
1670 *
1671 * <p> The field to be reflected is determined by the algorithm that
1672 * follows. Let C be the class or interface represented by this object:
1673 *
1674 * <OL>
1675 * <LI> If C declares a public field with the name specified, that is the
1676 * field to be reflected.</LI>
1677 * <LI> If no field was found in step 1 above, this algorithm is applied
1678 * recursively to each direct superinterface of C. The direct
1679 * superinterfaces are searched in the order they were declared.</LI>
1680 * <LI> If no field was found in steps 1 and 2 above, and C has a
1681 * superclass S, then this algorithm is invoked recursively upon S.
1682 * If C has no superclass, then a {@code NoSuchFieldException}
1683 * is thrown.</LI>
1684 * </OL>
1685 *
1686 * <p> If this {@code Class} object represents an array type, then this
1687 * method does not find the {@code length} field of the array type.
1688 *
1689 * @param name the field name
1690 * @return the {@code Field} object of this class specified by
1691 * {@code name}
1692 * @throws NoSuchFieldException if a field with the specified name is
1693 * not found.
1694 * @throws NullPointerException if {@code name} is {@code null}
1695 * @throws SecurityException
1696 * If a security manager, <i>s</i>, is present and
1697 * the caller's class loader is not the same as or an
1698 * ancestor of the class loader for the current class and
1699 * invocation of {@link SecurityManager#checkPackageAccess
1700 * s.checkPackageAccess()} denies access to the package
1701 * of this class.
1702 *
1703 * @since 1.1
1704 * @jls 8.2 Class Members
1705 * @jls 8.3 Field Declarations
1706 */
1707 @CallerSensitive
1708 public Field getField(String name)
1709 throws NoSuchFieldException, SecurityException {
1710 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1711 Field field = getField0(name);
1712 if (field == null) {
1713 throw new NoSuchFieldException(name);
1714 }
1715 return field;
1716 }
1717
1718
1719 /**
1720 * Returns a {@code Method} object that reflects the specified public
1721 * member method of the class or interface represented by this
1722 * {@code Class} object. The {@code name} parameter is a
1723 * {@code String} specifying the simple name of the desired method. The
1724 * {@code parameterTypes} parameter is an array of {@code Class}
1725 * objects that identify the method's formal parameter types, in declared
1726 * order. If {@code parameterTypes} is {@code null}, it is
1727 * treated as if it were an empty array.
1728 *
1729 * <p> If the {@code name} is "{@code <init>}" or "{@code <clinit>}" a
1730 * {@code NoSuchMethodException} is raised. Otherwise, the method to
1731 * be reflected is determined by the algorithm that follows. Let C be the
1732 * class or interface represented by this object:
1733 * <OL>
1734 * <LI> C is searched for a <I>matching method</I>, as defined below. If a
1735 * matching method is found, it is reflected.</LI>
1736 * <LI> If no matching method is found by step 1 then:
1737 * <OL TYPE="a">
1738 * <LI> If C is a class other than {@code Object}, then this algorithm is
1739 * invoked recursively on the superclass of C.</LI>
1740 * <LI> If C is the class {@code Object}, or if C is an interface, then
1741 * the superinterfaces of C (if any) are searched for a matching
1742 * method. If any such method is found, it is reflected.</LI>
1743 * </OL></LI>
1744 * </OL>
1745 *
1746 * <p> To find a matching method in a class or interface C: If C
1747 * declares exactly one public method with the specified name and exactly
1748 * the same formal parameter types, that is the method reflected. If more
1749 * than one such method is found in C, and one of these methods has a
1750 * return type that is more specific than any of the others, that method is
1751 * reflected; otherwise one of the methods is chosen arbitrarily.
1752 *
1753 * <p>Note that there may be more than one matching method in a
1754 * class because while the Java language forbids a class to
1755 * declare multiple methods with the same signature but different
1756 * return types, the Java virtual machine does not. This
1757 * increased flexibility in the virtual machine can be used to
1758 * implement various language features. For example, covariant
1759 * returns can be implemented with {@linkplain
1760 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1761 * method and the method being overridden would have the same
1762 * signature but different return types.
1763 *
1764 * <p> If this {@code Class} object represents an array type, then this
1765 * method does not find the {@code clone()} method.
1766 *
1767 * <p> Static methods declared in superinterfaces of the class or interface
1768 * represented by this {@code Class} object are not considered members of
1769 * the class or interface.
1770 *
1771 * @param name the name of the method
1772 * @param parameterTypes the list of parameters
1773 * @return the {@code Method} object that matches the specified
1774 * {@code name} and {@code parameterTypes}
1775 * @throws NoSuchMethodException if a matching method is not found
1776 * or if the name is "<init>"or "<clinit>".
1777 * @throws NullPointerException if {@code name} is {@code null}
1778 * @throws SecurityException
1779 * If a security manager, <i>s</i>, is present and
1780 * the caller's class loader is not the same as or an
1781 * ancestor of the class loader for the current class and
1782 * invocation of {@link SecurityManager#checkPackageAccess
1783 * s.checkPackageAccess()} denies access to the package
1784 * of this class.
1785 *
1786 * @jls 8.2 Class Members
1787 * @jls 8.4 Method Declarations
1788 * @since 1.1
1789 */
1790 @CallerSensitive
1791 public Method getMethod(String name, Class<?>... parameterTypes)
1792 throws NoSuchMethodException, SecurityException {
1793 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1794 Method method = getMethod0(name, parameterTypes, true);
1795 if (method == null) {
1796 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1797 }
1798 return method;
1799 }
1800
1801
1802 /**
1803 * Returns a {@code Constructor} object that reflects the specified
1804 * public constructor of the class represented by this {@code Class}
1805 * object. The {@code parameterTypes} parameter is an array of
1806 * {@code Class} objects that identify the constructor's formal
1807 * parameter types, in declared order.
1808 *
1809 * If this {@code Class} object represents an inner class
1810 * declared in a non-static context, the formal parameter types
1811 * include the explicit enclosing instance as the first parameter.
1812 *
1813 * <p> The constructor to reflect is the public constructor of the class
1814 * represented by this {@code Class} object whose formal parameter
1815 * types match those specified by {@code parameterTypes}.
1816 *
1817 * @param parameterTypes the parameter array
1818 * @return the {@code Constructor} object of the public constructor that
1819 * matches the specified {@code parameterTypes}
1820 * @throws NoSuchMethodException if a matching method is not found.
1821 * @throws SecurityException
1822 * If a security manager, <i>s</i>, is present and
1823 * the caller's class loader is not the same as or an
1824 * ancestor of the class loader for the current class and
1825 * invocation of {@link SecurityManager#checkPackageAccess
1826 * s.checkPackageAccess()} denies access to the package
1827 * of this class.
1828 *
1829 * @since 1.1
1830 */
1831 @CallerSensitive
1832 public Constructor<T> getConstructor(Class<?>... parameterTypes)
1833 throws NoSuchMethodException, SecurityException {
1834 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1835 return getConstructor0(parameterTypes, Member.PUBLIC);
1836 }
1837
1838
1839 /**
1840 * Returns an array of {@code Class} objects reflecting all the
1841 * classes and interfaces declared as members of the class represented by
1842 * this {@code Class} object. This includes public, protected, default
1843 * (package) access, and private classes and interfaces declared by the
1844 * class, but excludes inherited classes and interfaces. This method
1845 * returns an array of length 0 if the class declares no classes or
1846 * interfaces as members, or if this {@code Class} object represents a
1847 * primitive type, an array class, or void.
1848 *
1849 * @return the array of {@code Class} objects representing all the
1850 * declared members of this class
1851 * @throws SecurityException
1852 * If a security manager, <i>s</i>, is present and any of the
1853 * following conditions is met:
1854 *
1855 * <ul>
1856 *
1857 * <li> the caller's class loader is not the same as the
1858 * class loader of this class and invocation of
1859 * {@link SecurityManager#checkPermission
1860 * s.checkPermission} method with
1861 * {@code RuntimePermission("accessDeclaredMembers")}
1862 * denies access to the declared classes within this class
1863 *
1864 * <li> the caller's class loader is not the same as or an
1865 * ancestor of the class loader for the current class and
1866 * invocation of {@link SecurityManager#checkPackageAccess
1867 * s.checkPackageAccess()} denies access to the package
1868 * of this class
1869 *
1870 * </ul>
1871 *
1872 * @since 1.1
1873 */
1874 @CallerSensitive
1875 public Class<?>[] getDeclaredClasses() throws SecurityException {
1876 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), false);
1877 return getDeclaredClasses0();
1878 }
1879
1880
1881 /**
1882 * Returns an array of {@code Field} objects reflecting all the fields
1883 * declared by the class or interface represented by this
1884 * {@code Class} object. This includes public, protected, default
1885 * (package) access, and private fields, but excludes inherited fields.
1886 *
1887 * <p> If this {@code Class} object represents a class or interface with no
1888 * declared fields, then this method returns an array of length 0.
1889 *
1890 * <p> If this {@code Class} object represents an array type, a primitive
1891 * type, or void, then this method returns an array of length 0.
1892 *
1893 * <p> The elements in the returned array are not sorted and are not in any
1894 * particular order.
1895 *
1896 * @return the array of {@code Field} objects representing all the
1897 * declared fields of this class
1898 * @throws SecurityException
1899 * If a security manager, <i>s</i>, is present and any of the
1900 * following conditions is met:
1901 *
1902 * <ul>
1903 *
1904 * <li> the caller's class loader is not the same as the
1905 * class loader of this class and invocation of
1906 * {@link SecurityManager#checkPermission
1907 * s.checkPermission} method with
1908 * {@code RuntimePermission("accessDeclaredMembers")}
1909 * denies access to the declared fields within this class
1910 *
1911 * <li> the caller's class loader is not the same as or an
1912 * ancestor of the class loader for the current class and
1913 * invocation of {@link SecurityManager#checkPackageAccess
1914 * s.checkPackageAccess()} denies access to the package
1915 * of this class
1916 *
1917 * </ul>
1918 *
1919 * @since 1.1
1920 * @jls 8.2 Class Members
1921 * @jls 8.3 Field Declarations
1922 */
1923 @CallerSensitive
1924 public Field[] getDeclaredFields() throws SecurityException {
1925 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
1926 return copyFields(privateGetDeclaredFields(false));
1927 }
1928
1929
1930 /**
1931 *
1932 * Returns an array containing {@code Method} objects reflecting all the
1933 * declared methods of the class or interface represented by this {@code
1934 * Class} object, including public, protected, default (package)
1935 * access, and private methods, but excluding inherited methods.
1936 *
1937 * <p> If this {@code Class} object represents a type that has multiple
1938 * declared methods with the same name and parameter types, but different
1939 * return types, then the returned array has a {@code Method} object for
1940 * each such method.
1941 *
1942 * <p> If this {@code Class} object represents a type that has a class
1943 * initialization method {@code <clinit>}, then the returned array does
1944 * <em>not</em> have a corresponding {@code Method} object.
1945 *
1946 * <p> If this {@code Class} object represents a class or interface with no
1947 * declared methods, then the returned array has length 0.
1948 *
1949 * <p> If this {@code Class} object represents an array type, a primitive
1950 * type, or void, then the returned array has length 0.
1951 *
1952 * <p> The elements in the returned array are not sorted and are not in any
1953 * particular order.
1954 *
1955 * @return the array of {@code Method} objects representing all the
1956 * declared methods of this class
1957 * @throws SecurityException
1958 * If a security manager, <i>s</i>, is present and any of the
1959 * following conditions is met:
1960 *
1961 * <ul>
1962 *
1963 * <li> the caller's class loader is not the same as the
1964 * class loader of this class and invocation of
1965 * {@link SecurityManager#checkPermission
1966 * s.checkPermission} method with
1967 * {@code RuntimePermission("accessDeclaredMembers")}
1968 * denies access to the declared methods within this class
1969 *
1970 * <li> the caller's class loader is not the same as or an
1971 * ancestor of the class loader for the current class and
1972 * invocation of {@link SecurityManager#checkPackageAccess
1973 * s.checkPackageAccess()} denies access to the package
1974 * of this class
1975 *
1976 * </ul>
1977 *
1978 * @jls 8.2 Class Members
1979 * @jls 8.4 Method Declarations
1980 * @since 1.1
1981 */
1982 @CallerSensitive
1983 public Method[] getDeclaredMethods() throws SecurityException {
1984 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
1985 return copyMethods(privateGetDeclaredMethods(false));
1986 }
1987
1988
1989 /**
1990 * Returns an array of {@code Constructor} objects reflecting all the
1991 * constructors declared by the class represented by this
1992 * {@code Class} object. These are public, protected, default
1993 * (package) access, and private constructors. The elements in the array
1994 * returned are not sorted and are not in any particular order. If the
1995 * class has a default constructor, it is included in the returned array.
1996 * This method returns an array of length 0 if this {@code Class}
1997 * object represents an interface, a primitive type, an array class, or
1998 * void.
1999 *
2000 * <p> See <em>The Java Language Specification</em>, section 8.2.
2001 *
2002 * @return the array of {@code Constructor} objects representing all the
2003 * declared constructors of this class
2004 * @throws SecurityException
2005 * If a security manager, <i>s</i>, is present and any of the
2006 * following conditions is met:
2007 *
2008 * <ul>
2009 *
2010 * <li> the caller's class loader is not the same as the
2011 * class loader of this class and invocation of
2012 * {@link SecurityManager#checkPermission
2013 * s.checkPermission} method with
2014 * {@code RuntimePermission("accessDeclaredMembers")}
2015 * denies access to the declared constructors within this class
2016 *
2017 * <li> the caller's class loader is not the same as or an
2018 * ancestor of the class loader for the current class and
2019 * invocation of {@link SecurityManager#checkPackageAccess
2020 * s.checkPackageAccess()} denies access to the package
2021 * of this class
2022 *
2023 * </ul>
2024 *
2025 * @since 1.1
2026 */
2027 @CallerSensitive
2028 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
2029 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2030 return copyConstructors(privateGetDeclaredConstructors(false));
2031 }
2032
2033
2034 /**
2035 * Returns a {@code Field} object that reflects the specified declared
2036 * field of the class or interface represented by this {@code Class}
2037 * object. The {@code name} parameter is a {@code String} that specifies
2038 * the simple name of the desired field.
2039 *
2040 * <p> If this {@code Class} object represents an array type, then this
2041 * method does not find the {@code length} field of the array type.
2042 *
2043 * @param name the name of the field
2044 * @return the {@code Field} object for the specified field in this
2045 * class
2046 * @throws NoSuchFieldException if a field with the specified name is
2047 * not found.
2048 * @throws NullPointerException if {@code name} is {@code null}
2049 * @throws SecurityException
2050 * If a security manager, <i>s</i>, is present and any of the
2051 * following conditions is met:
2052 *
2053 * <ul>
2054 *
2055 * <li> the caller's class loader is not the same as the
2056 * class loader of this class and invocation of
2057 * {@link SecurityManager#checkPermission
2058 * s.checkPermission} method with
2059 * {@code RuntimePermission("accessDeclaredMembers")}
2060 * denies access to the declared field
2061 *
2062 * <li> the caller's class loader is not the same as or an
2063 * ancestor of the class loader for the current class and
2064 * invocation of {@link SecurityManager#checkPackageAccess
2065 * s.checkPackageAccess()} denies access to the package
2066 * of this class
2067 *
2068 * </ul>
2069 *
2070 * @since 1.1
2071 * @jls 8.2 Class Members
2072 * @jls 8.3 Field Declarations
2073 */
2074 @CallerSensitive
2075 public Field getDeclaredField(String name)
2076 throws NoSuchFieldException, SecurityException {
2077 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2078 Field field = searchFields(privateGetDeclaredFields(false), name);
2079 if (field == null) {
2080 throw new NoSuchFieldException(name);
2081 }
2082 return field;
2083 }
2084
2085
2086 /**
2087 * Returns a {@code Method} object that reflects the specified
2088 * declared method of the class or interface represented by this
2089 * {@code Class} object. The {@code name} parameter is a
2090 * {@code String} that specifies the simple name of the desired
2091 * method, and the {@code parameterTypes} parameter is an array of
2092 * {@code Class} objects that identify the method's formal parameter
2093 * types, in declared order. If more than one method with the same
2094 * parameter types is declared in a class, and one of these methods has a
2095 * return type that is more specific than any of the others, that method is
2096 * returned; otherwise one of the methods is chosen arbitrarily. If the
2097 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
2098 * is raised.
2099 *
2100 * <p> If this {@code Class} object represents an array type, then this
2101 * method does not find the {@code clone()} method.
2102 *
2103 * @param name the name of the method
2104 * @param parameterTypes the parameter array
2105 * @return the {@code Method} object for the method of this class
2106 * matching the specified name and parameters
2107 * @throws NoSuchMethodException if a matching method is not found.
2108 * @throws NullPointerException if {@code name} is {@code null}
2109 * @throws SecurityException
2110 * If a security manager, <i>s</i>, is present and any of the
2111 * following conditions is met:
2112 *
2113 * <ul>
2114 *
2115 * <li> the caller's class loader is not the same as the
2116 * class loader of this class and invocation of
2117 * {@link SecurityManager#checkPermission
2118 * s.checkPermission} method with
2119 * {@code RuntimePermission("accessDeclaredMembers")}
2120 * denies access to the declared method
2121 *
2122 * <li> the caller's class loader is not the same as or an
2123 * ancestor of the class loader for the current class and
2124 * invocation of {@link SecurityManager#checkPackageAccess
2125 * s.checkPackageAccess()} denies access to the package
2126 * of this class
2127 *
2128 * </ul>
2129 *
2130 * @jls 8.2 Class Members
2131 * @jls 8.4 Method Declarations
2132 * @since 1.1
2133 */
2134 @CallerSensitive
2135 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
2136 throws NoSuchMethodException, SecurityException {
2137 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2138 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
2139 if (method == null) {
2140 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
2141 }
2142 return method;
2143 }
2144
2145
2146 /**
2147 * Returns a {@code Constructor} object that reflects the specified
2148 * constructor of the class or interface represented by this
2149 * {@code Class} object. The {@code parameterTypes} parameter is
2150 * an array of {@code Class} objects that identify the constructor's
2151 * formal parameter types, in declared order.
2152 *
2153 * If this {@code Class} object represents an inner class
2154 * declared in a non-static context, the formal parameter types
2155 * include the explicit enclosing instance as the first parameter.
2156 *
2157 * @param parameterTypes the parameter array
2158 * @return The {@code Constructor} object for the constructor with the
2159 * specified parameter list
2160 * @throws NoSuchMethodException if a matching method is not found.
2161 * @throws SecurityException
2162 * If a security manager, <i>s</i>, is present and any of the
2163 * following conditions is met:
2164 *
2165 * <ul>
2166 *
2167 * <li> the caller's class loader is not the same as the
2168 * class loader of this class and invocation of
2169 * {@link SecurityManager#checkPermission
2170 * s.checkPermission} method with
2171 * {@code RuntimePermission("accessDeclaredMembers")}
2172 * denies access to the declared constructor
2173 *
2174 * <li> the caller's class loader is not the same as or an
2175 * ancestor of the class loader for the current class and
2176 * invocation of {@link SecurityManager#checkPackageAccess
2177 * s.checkPackageAccess()} denies access to the package
2178 * of this class
2179 *
2180 * </ul>
2181 *
2182 * @since 1.1
2183 */
2184 @CallerSensitive
2185 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
2186 throws NoSuchMethodException, SecurityException {
2187 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2188 return getConstructor0(parameterTypes, Member.DECLARED);
2189 }
2190
2191 /**
2192 * Finds a resource with a given name. The rules for searching resources
2193 * associated with a given class are implemented by the defining
2194 * {@linkplain ClassLoader class loader} of the class. This method
2195 * delegates to this object's class loader. If this object was loaded by
2196 * the bootstrap class loader, the method delegates to {@link
2197 * ClassLoader#getSystemResourceAsStream}.
2198 *
2199 * <p> Before delegation, an absolute resource name is constructed from the
2200 * given resource name using this algorithm:
2201 *
2202 * <ul>
2203 *
2204 * <li> If the {@code name} begins with a {@code '/'}
2205 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2206 * portion of the {@code name} following the {@code '/'}.
2207 *
2208 * <li> Otherwise, the absolute name is of the following form:
2209 *
2210 * <blockquote>
2211 * {@code modified_package_name/name}
2212 * </blockquote>
2213 *
2214 * <p> Where the {@code modified_package_name} is the package name of this
2215 * object with {@code '/'} substituted for {@code '.'}
2216 * (<tt>'\u002e'</tt>).
2217 *
2218 * </ul>
2219 *
2220 * @param name name of the desired resource
2221 * @return A {@link java.io.InputStream} object or {@code null} if
2222 * no resource with this name is found
2223 * @throws NullPointerException If {@code name} is {@code null}
2224 * @since 1.1
2225 */
2226 public InputStream getResourceAsStream(String name) {
2227 name = resolveName(name);
2228 ClassLoader cl = getClassLoader0();
2229 if (cl==null) {
2230 // A system class.
2231 return ClassLoader.getSystemResourceAsStream(name);
2232 }
2233 return cl.getResourceAsStream(name);
2234 }
2235
2236 /**
2237 * Finds a resource with a given name. The rules for searching resources
2238 * associated with a given class are implemented by the defining
2239 * {@linkplain ClassLoader class loader} of the class. This method
2240 * delegates to this object's class loader. If this object was loaded by
2241 * the bootstrap class loader, the method delegates to {@link
2242 * ClassLoader#getSystemResource}.
2243 *
2244 * <p> Before delegation, an absolute resource name is constructed from the
2245 * given resource name using this algorithm:
2246 *
2247 * <ul>
2248 *
2249 * <li> If the {@code name} begins with a {@code '/'}
2250 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2251 * portion of the {@code name} following the {@code '/'}.
2252 *
2253 * <li> Otherwise, the absolute name is of the following form:
2254 *
2255 * <blockquote>
2256 * {@code modified_package_name/name}
2257 * </blockquote>
2258 *
2259 * <p> Where the {@code modified_package_name} is the package name of this
2260 * object with {@code '/'} substituted for {@code '.'}
2261 * (<tt>'\u002e'</tt>).
2262 *
2263 * </ul>
2264 *
2265 * @param name name of the desired resource
2266 * @return A {@link java.net.URL} object or {@code null} if no
2267 * resource with this name is found
2268 * @since 1.1
2269 */
2270 public java.net.URL getResource(String name) {
2271 name = resolveName(name);
2272 ClassLoader cl = getClassLoader0();
2273 if (cl==null) {
2274 // A system class.
2275 return ClassLoader.getSystemResource(name);
2276 }
2277 return cl.getResource(name);
2278 }
2279
2280
2281
2282 /** protection domain returned when the internal domain is null */
2283 private static java.security.ProtectionDomain allPermDomain;
2284
2285
2286 /**
2287 * Returns the {@code ProtectionDomain} of this class. If there is a
2288 * security manager installed, this method first calls the security
2289 * manager's {@code checkPermission} method with a
2290 * {@code RuntimePermission("getProtectionDomain")} permission to
2291 * ensure it's ok to get the
2292 * {@code ProtectionDomain}.
2293 *
2294 * @return the ProtectionDomain of this class
2295 *
2296 * @throws SecurityException
2297 * if a security manager exists and its
2298 * {@code checkPermission} method doesn't allow
2299 * getting the ProtectionDomain.
2300 *
2301 * @see java.security.ProtectionDomain
2302 * @see SecurityManager#checkPermission
2303 * @see java.lang.RuntimePermission
2304 * @since 1.2
2305 */
2306 public java.security.ProtectionDomain getProtectionDomain() {
2307 SecurityManager sm = System.getSecurityManager();
2308 if (sm != null) {
2309 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2310 }
2311 java.security.ProtectionDomain pd = getProtectionDomain0();
2312 if (pd == null) {
2313 if (allPermDomain == null) {
2314 java.security.Permissions perms =
2315 new java.security.Permissions();
2316 perms.add(SecurityConstants.ALL_PERMISSION);
2317 allPermDomain =
2318 new java.security.ProtectionDomain(null, perms);
2319 }
2320 pd = allPermDomain;
2321 }
2322 return pd;
2323 }
2324
2325
2326 /**
2327 * Returns the ProtectionDomain of this class.
2328 */
2329 private native java.security.ProtectionDomain getProtectionDomain0();
2330
2331 /*
2332 * Return the Virtual Machine's Class object for the named
2333 * primitive type.
2334 */
2335 static native Class<?> getPrimitiveClass(String name);
2336
2337 /*
2338 * Check if client is allowed to access members. If access is denied,
2339 * throw a SecurityException.
2340 *
2341 * This method also enforces package access.
2342 *
2343 * <p> Default policy: allow all clients access with normal Java access
2344 * control.
2345 */
2346 private void checkMemberAccess(int which, Class<?> caller, boolean checkProxyInterfaces) {
2347 final SecurityManager s = System.getSecurityManager();
2348 if (s != null) {
2349 /* Default policy allows access to all {@link Member#PUBLIC} members,
2350 * as well as access to classes that have the same class loader as the caller.
2351 * In all other cases, it requires RuntimePermission("accessDeclaredMembers")
2352 * permission.
2353 */
2354 final ClassLoader ccl = ClassLoader.getClassLoader(caller);
2355 final ClassLoader cl = getClassLoader0();
2356 if (which != Member.PUBLIC) {
2357 if (ccl != cl) {
2358 s.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
2359 }
2360 }
2361 this.checkPackageAccess(ccl, checkProxyInterfaces);
2362 }
2363 }
2364
2365 /*
2366 * Checks if a client loaded in ClassLoader ccl is allowed to access this
2367 * class under the current package access policy. If access is denied,
2368 * throw a SecurityException.
2369 */
2370 private void checkPackageAccess(final ClassLoader ccl, boolean checkProxyInterfaces) {
2371 final SecurityManager s = System.getSecurityManager();
2372 if (s != null) {
2373 final ClassLoader cl = getClassLoader0();
2374
2375 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2376 String name = this.getName();
2377 int i = name.lastIndexOf('.');
2378 if (i != -1) {
2379 // skip the package access check on a proxy class in default proxy package
2380 String pkg = name.substring(0, i);
2381 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
2382 s.checkPackageAccess(pkg);
2383 }
2384 }
2385 }
2386 // check package access on the proxy interfaces
2387 if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
2388 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
2389 }
2390 }
2391 }
2392
2393 /**
2394 * Add a package name prefix if the name is not absolute Remove leading "/"
2395 * if name is absolute
2396 */
2397 private String resolveName(String name) {
2398 if (name == null) {
2399 return name;
2400 }
2401 if (!name.startsWith("/")) {
2402 Class<?> c = this;
2403 while (c.isArray()) {
2404 c = c.getComponentType();
2405 }
2406 String baseName = c.getName();
2407 int index = baseName.lastIndexOf('.');
2408 if (index != -1) {
2409 name = baseName.substring(0, index).replace('.', '/')
2410 +"/"+name;
2411 }
2412 } else {
2413 name = name.substring(1);
2414 }
2415 return name;
2416 }
2417
2418 /**
2419 * Atomic operations support.
2420 */
2421 private static class Atomic {
2422 // initialize Unsafe machinery here, since we need to call Class.class instance method
2423 // and have to avoid calling it in the static initializer of the Class class...
2424 private static final Unsafe unsafe = Unsafe.getUnsafe();
2425 // offset of Class.reflectionData instance field
2426 private static final long reflectionDataOffset;
2427 // offset of Class.annotationType instance field
2428 private static final long annotationTypeOffset;
2429 // offset of Class.annotationData instance field
2430 private static final long annotationDataOffset;
2431
2432 static {
2433 Field[] fields = Class.class.getDeclaredFields0(false); // bypass caches
2434 reflectionDataOffset = objectFieldOffset(fields, "reflectionData");
2435 annotationTypeOffset = objectFieldOffset(fields, "annotationType");
2436 annotationDataOffset = objectFieldOffset(fields, "annotationData");
2437 }
2438
2439 private static long objectFieldOffset(Field[] fields, String fieldName) {
2440 Field field = searchFields(fields, fieldName);
2441 if (field == null) {
2442 throw new Error("No " + fieldName + " field found in java.lang.Class");
2443 }
2444 return unsafe.objectFieldOffset(field);
2445 }
2446
2447 static <T> boolean casReflectionData(Class<?> clazz,
2448 SoftReference<ReflectionData<T>> oldData,
2449 SoftReference<ReflectionData<T>> newData) {
2450 return unsafe.compareAndSwapObject(clazz, reflectionDataOffset, oldData, newData);
2451 }
2452
2453 static <T> boolean casAnnotationType(Class<?> clazz,
2454 AnnotationType oldType,
2455 AnnotationType newType) {
2456 return unsafe.compareAndSwapObject(clazz, annotationTypeOffset, oldType, newType);
2457 }
2458
2459 static <T> boolean casAnnotationData(Class<?> clazz,
2460 AnnotationData oldData,
2461 AnnotationData newData) {
2462 return unsafe.compareAndSwapObject(clazz, annotationDataOffset, oldData, newData);
2463 }
2464 }
2465
2466 /**
2467 * ClassData
2468 */
2469 private static class ClassData<T> {
2470 /**
2471 * This needs to be a simple data structure because we need to access
2472 * and update its elements from the JVM. Note that the Java side controls
2473 * the allocation and order of elements in the array; the JVM modifies
2474 * fields of those elements during class redefinition.
2475 */
2476 private volatile Comparable<?>[] elementData;
2477 private volatile int size;
2478
2479 /**
2480 * Interns a member name in the member name table.
2481 * Returns null if a race with the jvm occurred. Races are detected
2482 * by checking for changes in the class redefinition count that occur
2483 * before an intern is complete.
2484 *
2485 * @param klass class whose redefinition count is checked.
2486 * @param memberName member name to be interned
2487 * @param redefined_count the value of classRedefinedCount() observed before
2488 * creation of the MemberName that is being interned.
2489 * @return null if a race occurred, otherwise the interned MemberName.
2490 */
2491 @SuppressWarnings({"unchecked","rawtypes"})
2492 public <E extends Comparable<? super E>> E intern(Class<?> klass, E memberName, int redefined_count) {
2493 if (elementData == null) {
2494 synchronized (this) {
2495 if (elementData == null) {
2496 elementData = new Comparable[1];
2497 }
2498 }
2499 }
2500 synchronized (elementData) {
2501 final int index = Arrays.binarySearch(elementData, 0, size, memberName);
2502 if (index >= 0) {
2503 return (E) elementData[index];
2504 }
2505 // Not found, add carefully.
2506 return add(klass, ~index, memberName, redefined_count);
2507 }
2508 }
2509
2510 /**
2511 * Appends the specified element at the specified index.
2512 *
2513 * @param klass the klass for this ClassData.
2514 * @param index index at which insertion should occur
2515 * @param e element to be insert into this list
2516 * @param redefined_count value of klass.classRedefinedCount() before e was created.
2517 * @return null if insertion failed because of redefinition race, otherwise e.
2518 */
2519 private <E extends Comparable<? super E>> E add(Class<?> klass, int index, E e, int redefined_count) {
2520 int oldCapacity = size;
2521 Comparable<?>[] element_data = elementData;
2522 if (oldCapacity + 1 > element_data.length ) {
2523 // Replacing array with a copy is safe; elements are identical.
2524 grow(oldCapacity + 1);
2525 element_data = elementData;
2526 }
2527 /*
2528 * Careful dance to insert an element.
2529 *
2530 * Wish to ensure that we do not hide an element of
2531 * the array; must also ensure that visible-to-jvm
2532 * portion of array never contains nulls; also ensure
2533 * that array remains sorted.
2534 *
2535 * Note that taking a safepoint is also a barrier.
2536 */
2537 if (oldCapacity > 0) {
2538 element_data[oldCapacity] = element_data[oldCapacity - 1];
2539 // all array elements are non-null and sorted, increase size.
2540 // if store to element_data above floats below
2541 // store to size on the next line, that will be
2542 // inconsistent to the VM if a safepoint occurs here.
2543 size += 1;
2544 for (int i = oldCapacity; i > index; i--) {
2545 // pre: element_data[i] is duplicated at [i+1]
2546 element_data[i] = element_data[i - 1];
2547 // post: element_data[i-1] is duplicated at [i]
2548 }
2549 // element_data[index] is duplicated at [index+1]
2550 element_data[index] = (Comparable<?>) e;
2551 } else {
2552 element_data[index] = (Comparable<?>) e;
2553 // Don't want store to element_data[index] above
2554 // to float past store to size below, otherwise
2555 // VM might see inconsistent state.
2556 size += 1;
2557 }
2558 if (redefined_count == klass.classRedefinedCount()) {
2559 return e;
2560 }
2561 /* The race was lost, must undo insertion and retry the intern
2562 * with a new resolution.
2563 */
2564 for (int i = index; i < oldCapacity; i++) {
2565 element_data[i] = element_data[i+1];
2566 }
2567 size -= 1;
2568 return null;
2569 }
2570
2571 /**
2572 * Increases the capacity to ensure that it can hold at least the
2573 * number of elements specified by the minimum capacity argument.
2574 *
2575 * @param minCapacity the desired minimum capacity
2576 */
2577 private void grow(int minCapacity) {
2578 // overflow-conscious code
2579 int oldCapacity = elementData.length;
2580 int newCapacity = oldCapacity + (oldCapacity >> 1);
2581 if (newCapacity - minCapacity < 0)
2582 newCapacity = minCapacity;
2583 // minCapacity is usually close to size, so this is a win:
2584 elementData = Arrays.copyOf(elementData, newCapacity);
2585 }
2586 }
2587
2588 private volatile transient ClassData<T> classData;
2589
2590 /**
2591 * Lazily create {@link ClassData}.
2592 */
2593 private ClassData<T> classData() {
2594 if (this.classData != null) {
2595 return this.classData;
2596 }
2597 synchronized (this) {
2598 if (this.classData == null) {
2599 this.classData = new ClassData<>();
2600 }
2601 }
2602 return this.classData;
2603 }
2604
2605 /* package */ <E extends Comparable<? super E>> E internMemberName(E memberName, int redefined_count) {
2606 return classData().intern(this, memberName, redefined_count);
2607 }
2608
2609 /* package */ int classRedefinedCount() {
2610 return classRedefinedCount;
2611 }
2612
2613 /**
2614 * Reflection support.
2615 */
2616
2617 // Caches for certain reflective results
2618 private static boolean useCaches = true;
2619
2620 // reflection data that might get invalidated when JVM TI RedefineClasses() is called
2621 private static class ReflectionData<T> {
2622 volatile Field[] declaredFields;
2623 volatile Field[] publicFields;
2624 volatile Method[] declaredMethods;
2625 volatile Method[] publicMethods;
2626 volatile Constructor<T>[] declaredConstructors;
2627 volatile Constructor<T>[] publicConstructors;
2628 // Intermediate results for getFields and getMethods
2629 volatile Field[] declaredPublicFields;
2630 volatile Method[] declaredPublicMethods;
2631 volatile Class<?>[] interfaces;
2632
2633 // Value of classRedefinedCount when we created this ReflectionData instance
2634 final int redefinedCount;
2635
2636 ReflectionData(int redefinedCount) {
2637 this.redefinedCount = redefinedCount;
2638 }
2639 }
2640
2641 private volatile transient SoftReference<ReflectionData<T>> reflectionData;
2642
2643 // Incremented by the VM on each call to JVM TI RedefineClasses()
2644 // that redefines this class or a superclass.
2645 private volatile transient int classRedefinedCount = 0;
2646
2647 // Lazily create and cache ReflectionData
2648 private ReflectionData<T> reflectionData() {
2649 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
2650 int classRedefinedCount = this.classRedefinedCount;
2651 ReflectionData<T> rd;
2652 if (useCaches &&
2653 reflectionData != null &&
2654 (rd = reflectionData.get()) != null &&
2655 rd.redefinedCount == classRedefinedCount) {
2656 return rd;
2657 }
2658 // else no SoftReference or cleared SoftReference or stale ReflectionData
2659 // -> create and replace new instance
2660 return newReflectionData(reflectionData, classRedefinedCount);
2661 }
2662
2663 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
2664 int classRedefinedCount) {
2665 if (!useCaches) return null;
2666
2667 while (true) {
2668 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
2669 // try to CAS it...
2670 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
2671 return rd;
2672 }
2673 // else retry
2674 oldReflectionData = this.reflectionData;
2675 classRedefinedCount = this.classRedefinedCount;
2676 if (oldReflectionData != null &&
2677 (rd = oldReflectionData.get()) != null &&
2678 rd.redefinedCount == classRedefinedCount) {
2679 return rd;
2680 }
2681 }
2682 }
2683
2684 // Generic signature handling
2685 private native String getGenericSignature0();
2686
2687 // Generic info repository; lazily initialized
2688 private volatile transient ClassRepository genericInfo;
2689
2690 // accessor for factory
2691 private GenericsFactory getFactory() {
2692 // create scope and factory
2693 return CoreReflectionFactory.make(this, ClassScope.make(this));
2694 }
2695
2696 // accessor for generic info repository;
2697 // generic info is lazily initialized
2698 private ClassRepository getGenericInfo() {
2699 ClassRepository genericInfo = this.genericInfo;
2700 if (genericInfo == null) {
2701 String signature = getGenericSignature0();
2702 if (signature == null) {
2703 genericInfo = ClassRepository.NONE;
2704 } else {
2705 genericInfo = ClassRepository.make(signature, getFactory());
2706 }
2707 this.genericInfo = genericInfo;
2708 }
2709 return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
2710 }
2711
2712 // Annotations handling
2713 native byte[] getRawAnnotations();
2714 // Since 1.8
2715 native byte[] getRawTypeAnnotations();
2716 static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
2717 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
2718 }
2719
2720 native ConstantPool getConstantPool();
2721
2722 //
2723 //
2724 // java.lang.reflect.Field handling
2725 //
2726 //
2727
2728 // Returns an array of "root" fields. These Field objects must NOT
2729 // be propagated to the outside world, but must instead be copied
2730 // via ReflectionFactory.copyField.
2731 private Field[] privateGetDeclaredFields(boolean publicOnly) {
2732 checkInitted();
2733 Field[] res;
2734 ReflectionData<T> rd = reflectionData();
2735 if (rd != null) {
2736 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
2737 if (res != null) return res;
2738 }
2739 // No cached value available; request value from VM
2740 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
2741 if (rd != null) {
2742 if (publicOnly) {
2743 rd.declaredPublicFields = res;
2744 } else {
2745 rd.declaredFields = res;
2746 }
2747 }
2748 return res;
2749 }
2750
2751 // Returns an array of "root" fields. These Field objects must NOT
2752 // be propagated to the outside world, but must instead be copied
2753 // via ReflectionFactory.copyField.
2754 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) {
2755 checkInitted();
2756 Field[] res;
2757 ReflectionData<T> rd = reflectionData();
2758 if (rd != null) {
2759 res = rd.publicFields;
2760 if (res != null) return res;
2761 }
2762
2763 // No cached value available; compute value recursively.
2764 // Traverse in correct order for getField().
2765 List<Field> fields = new ArrayList<>();
2766 if (traversedInterfaces == null) {
2767 traversedInterfaces = new HashSet<>();
2768 }
2769
2770 // Local fields
2771 Field[] tmp = privateGetDeclaredFields(true);
2772 addAll(fields, tmp);
2773
2774 // Direct superinterfaces, recursively
2775 for (Class<?> c : getInterfaces()) {
2776 if (!traversedInterfaces.contains(c)) {
2777 traversedInterfaces.add(c);
2778 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2779 }
2780 }
2781
2782 // Direct superclass, recursively
2783 if (!isInterface()) {
2784 Class<?> c = getSuperclass();
2785 if (c != null) {
2786 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2787 }
2788 }
2789
2790 res = new Field[fields.size()];
2791 fields.toArray(res);
2792 if (rd != null) {
2793 rd.publicFields = res;
2794 }
2795 return res;
2796 }
2797
2798 private static void addAll(Collection<Field> c, Field[] o) {
2799 for (Field f : o) {
2800 c.add(f);
2801 }
2802 }
2803
2804
2805 //
2806 //
2807 // java.lang.reflect.Constructor handling
2808 //
2809 //
2810
2811 // Returns an array of "root" constructors. These Constructor
2812 // objects must NOT be propagated to the outside world, but must
2813 // instead be copied via ReflectionFactory.copyConstructor.
2814 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
2815 checkInitted();
2816 Constructor<T>[] res;
2817 ReflectionData<T> rd = reflectionData();
2818 if (rd != null) {
2819 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
2820 if (res != null) return res;
2821 }
2822 // No cached value available; request value from VM
2823 if (isInterface()) {
2824 @SuppressWarnings("unchecked")
2825 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
2826 res = temporaryRes;
2827 } else {
2828 res = getDeclaredConstructors0(publicOnly);
2829 }
2830 if (rd != null) {
2831 if (publicOnly) {
2832 rd.publicConstructors = res;
2833 } else {
2834 rd.declaredConstructors = res;
2835 }
2836 }
2837 return res;
2838 }
2839
2840 //
2841 //
2842 // java.lang.reflect.Method handling
2843 //
2844 //
2845
2846 // Returns an array of "root" methods. These Method objects must NOT
2847 // be propagated to the outside world, but must instead be copied
2848 // via ReflectionFactory.copyMethod.
2849 private Method[] privateGetDeclaredMethods(boolean publicOnly) {
2850 checkInitted();
2851 Method[] res;
2852 ReflectionData<T> rd = reflectionData();
2853 if (rd != null) {
2854 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
2855 if (res != null) return res;
2856 }
2857 // No cached value available; request value from VM
2858 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
2859 if (rd != null) {
2860 if (publicOnly) {
2861 rd.declaredPublicMethods = res;
2862 } else {
2863 rd.declaredMethods = res;
2864 }
2865 }
2866 return res;
2867 }
2868
2869 static class MethodArray {
2870 // Don't add or remove methods except by add() or remove() calls.
2871 private Method[] methods;
2872 private int length;
2873 private int defaults;
2874
2875 MethodArray() {
2876 this(20);
2877 }
2878
2879 MethodArray(int initialSize) {
2880 if (initialSize < 2)
2881 throw new IllegalArgumentException("Size should be 2 or more");
2882
2883 methods = new Method[initialSize];
2884 length = 0;
2885 defaults = 0;
2886 }
2887
2888 boolean hasDefaults() {
2889 return defaults != 0;
2890 }
2891
2892 void add(Method m) {
2893 if (length == methods.length) {
2894 methods = Arrays.copyOf(methods, 2 * methods.length);
2895 }
2896 methods[length++] = m;
2897
2898 if (m != null && m.isDefault())
2899 defaults++;
2900 }
2901
2902 void addAll(Method[] ma) {
2903 for (Method m : ma) {
2904 add(m);
2905 }
2906 }
2907
2908 void addAll(MethodArray ma) {
2909 for (int i = 0; i < ma.length(); i++) {
2910 add(ma.get(i));
2911 }
2912 }
2913
2914 void addIfNotPresent(Method newMethod) {
2915 for (int i = 0; i < length; i++) {
2916 Method m = methods[i];
2917 if (m == newMethod || (m != null && m.equals(newMethod))) {
2918 return;
2919 }
2920 }
2921 add(newMethod);
2922 }
2923
2924 void addAllIfNotPresent(MethodArray newMethods) {
2925 for (int i = 0; i < newMethods.length(); i++) {
2926 Method m = newMethods.get(i);
2927 if (m != null) {
2928 addIfNotPresent(m);
2929 }
2930 }
2931 }
2932
2933 /* Add Methods declared in an interface to this MethodArray.
2934 * Static methods declared in interfaces are not inherited.
2935 */
2936 void addInterfaceMethods(Method[] methods) {
2937 for (Method candidate : methods) {
2938 if (!Modifier.isStatic(candidate.getModifiers())) {
2939 add(candidate);
2940 }
2941 }
2942 }
2943
2944 int length() {
2945 return length;
2946 }
2947
2948 Method get(int i) {
2949 return methods[i];
2950 }
2951
2952 Method getFirst() {
2953 for (Method m : methods)
2954 if (m != null)
2955 return m;
2956 return null;
2957 }
2958
2959 void removeByNameAndDescriptor(Method toRemove) {
2960 for (int i = 0; i < length; i++) {
2961 Method m = methods[i];
2962 if (m != null && matchesNameAndDescriptor(m, toRemove)) {
2963 remove(i);
2964 }
2965 }
2966 }
2967
2968 private void remove(int i) {
2969 if (methods[i] != null && methods[i].isDefault())
2970 defaults--;
2971 methods[i] = null;
2972 }
2973
2974 private boolean matchesNameAndDescriptor(Method m1, Method m2) {
2975 return m1.getReturnType() == m2.getReturnType() &&
2976 m1.getName() == m2.getName() && // name is guaranteed to be interned
2977 arrayContentsEq(m1.getParameterTypes(),
2978 m2.getParameterTypes());
2979 }
2980
2981 void compactAndTrim() {
2982 int newPos = 0;
2983 // Get rid of null slots
2984 for (int pos = 0; pos < length; pos++) {
2985 Method m = methods[pos];
2986 if (m != null) {
2987 if (pos != newPos) {
2988 methods[newPos] = m;
2989 }
2990 newPos++;
2991 }
2992 }
2993 if (newPos != methods.length) {
2994 methods = Arrays.copyOf(methods, newPos);
2995 }
2996 }
2997
2998 /* Removes all Methods from this MethodArray that have a more specific
2999 * default Method in this MethodArray.
3000 *
3001 * Users of MethodArray are responsible for pruning Methods that have
3002 * a more specific <em>concrete</em> Method.
3003 */
3004 void removeLessSpecifics() {
3005 if (!hasDefaults())
3006 return;
3007
3008 for (int i = 0; i < length; i++) {
3009 Method m = get(i);
3010 if (m == null || !m.isDefault())
3011 continue;
3012
3013 for (int j = 0; j < length; j++) {
3014 if (i == j)
3015 continue;
3016
3017 Method candidate = get(j);
3018 if (candidate == null)
3019 continue;
3020
3021 if (!matchesNameAndDescriptor(m, candidate))
3022 continue;
3023
3024 if (hasMoreSpecificClass(m, candidate))
3025 remove(j);
3026 }
3027 }
3028 }
3029
3030 Method[] getArray() {
3031 return methods;
3032 }
3033
3034 // Returns true if m1 is more specific than m2
3035 static boolean hasMoreSpecificClass(Method m1, Method m2) {
3036 Class<?> m1Class = m1.getDeclaringClass();
3037 Class<?> m2Class = m2.getDeclaringClass();
3038 return m1Class != m2Class && m2Class.isAssignableFrom(m1Class);
3039 }
3040 }
3041
3042
3043 // Returns an array of "root" methods. These Method objects must NOT
3044 // be propagated to the outside world, but must instead be copied
3045 // via ReflectionFactory.copyMethod.
3046 private Method[] privateGetPublicMethods() {
3047 checkInitted();
3048 Method[] res;
3049 ReflectionData<T> rd = reflectionData();
3050 if (rd != null) {
3051 res = rd.publicMethods;
3052 if (res != null) return res;
3053 }
3054
3055 // No cached value available; compute value recursively.
3056 // Start by fetching public declared methods
3057 MethodArray methods = new MethodArray();
3058 {
3059 Method[] tmp = privateGetDeclaredMethods(true);
3060 methods.addAll(tmp);
3061 }
3062 // Now recur over superclass and direct superinterfaces.
3063 // Go over superinterfaces first so we can more easily filter
3064 // out concrete implementations inherited from superclasses at
3065 // the end.
3066 MethodArray inheritedMethods = new MethodArray();
3067 for (Class<?> i : getInterfaces()) {
3068 inheritedMethods.addInterfaceMethods(i.privateGetPublicMethods());
3069 }
3070 if (!isInterface()) {
3071 Class<?> c = getSuperclass();
3072 if (c != null) {
3073 MethodArray supers = new MethodArray();
3074 supers.addAll(c.privateGetPublicMethods());
3075 // Filter out concrete implementations of any
3076 // interface methods
3077 for (int i = 0; i < supers.length(); i++) {
3078 Method m = supers.get(i);
3079 if (m != null &&
3080 !Modifier.isAbstract(m.getModifiers()) &&
3081 !m.isDefault()) {
3082 inheritedMethods.removeByNameAndDescriptor(m);
3083 }
3084 }
3085 // Insert superclass's inherited methods before
3086 // superinterfaces' to satisfy getMethod's search
3087 // order
3088 supers.addAll(inheritedMethods);
3089 inheritedMethods = supers;
3090 }
3091 }
3092 // Filter out all local methods from inherited ones
3093 for (int i = 0; i < methods.length(); i++) {
3094 Method m = methods.get(i);
3095 inheritedMethods.removeByNameAndDescriptor(m);
3096 }
3097 methods.addAllIfNotPresent(inheritedMethods);
3098 methods.removeLessSpecifics();
3099 methods.compactAndTrim();
3100 res = methods.getArray();
3101 if (rd != null) {
3102 rd.publicMethods = res;
3103 }
3104 return res;
3105 }
3106
3107
3108 //
3109 // Helpers for fetchers of one field, method, or constructor
3110 //
3111
3112 private static Field searchFields(Field[] fields, String name) {
3113 String internedName = name.intern();
3114 for (Field field : fields) {
3115 if (field.getName() == internedName) {
3116 return getReflectionFactory().copyField(field);
3117 }
3118 }
3119 return null;
3120 }
3121
3122 private Field getField0(String name) throws NoSuchFieldException {
3123 // Note: the intent is that the search algorithm this routine
3124 // uses be equivalent to the ordering imposed by
3125 // privateGetPublicFields(). It fetches only the declared
3126 // public fields for each class, however, to reduce the number
3127 // of Field objects which have to be created for the common
3128 // case where the field being requested is declared in the
3129 // class which is being queried.
3130 Field res;
3131 // Search declared public fields
3132 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
3133 return res;
3134 }
3135 // Direct superinterfaces, recursively
3136 Class<?>[] interfaces = getInterfaces();
3137 for (Class<?> c : interfaces) {
3138 if ((res = c.getField0(name)) != null) {
3139 return res;
3140 }
3141 }
3142 // Direct superclass, recursively
3143 if (!isInterface()) {
3144 Class<?> c = getSuperclass();
3145 if (c != null) {
3146 if ((res = c.getField0(name)) != null) {
3147 return res;
3148 }
3149 }
3150 }
3151 return null;
3152 }
3153
3154 private static Method searchMethods(Method[] methods,
3155 String name,
3156 Class<?>[] parameterTypes)
3157 {
3158 Method res = null;
3159 String internedName = name.intern();
3160 for (Method m : methods) {
3161 if (m.getName() == internedName
3162 && arrayContentsEq(parameterTypes, m.getParameterTypes())
3163 && (res == null
3164 || res.getReturnType().isAssignableFrom(m.getReturnType())))
3165 res = m;
3166 }
3167
3168 return (res == null ? res : getReflectionFactory().copyMethod(res));
3169 }
3170
3171 private Method getMethod0(String name, Class<?>[] parameterTypes, boolean includeStaticMethods) {
3172 MethodArray interfaceCandidates = new MethodArray(2);
3173 Method res = privateGetMethodRecursive(name, parameterTypes, includeStaticMethods, interfaceCandidates);
3174 if (res != null)
3175 return res;
3176
3177 // Not found on class or superclass directly
3178 interfaceCandidates.removeLessSpecifics();
3179 return interfaceCandidates.getFirst(); // may be null
3180 }
3181
3182 private Method privateGetMethodRecursive(String name,
3183 Class<?>[] parameterTypes,
3184 boolean includeStaticMethods,
3185 MethodArray allInterfaceCandidates) {
3186 // Note: the intent is that the search algorithm this routine
3187 // uses be equivalent to the ordering imposed by
3188 // privateGetPublicMethods(). It fetches only the declared
3189 // public methods for each class, however, to reduce the
3190 // number of Method objects which have to be created for the
3191 // common case where the method being requested is declared in
3192 // the class which is being queried.
3193 //
3194 // Due to default methods, unless a method is found on a superclass,
3195 // methods declared in any superinterface needs to be considered.
3196 // Collect all candidates declared in superinterfaces in {@code
3197 // allInterfaceCandidates} and select the most specific if no match on
3198 // a superclass is found.
3199
3200 // Must _not_ return root methods
3201 Method res;
3202 // Search declared public methods
3203 if ((res = searchMethods(privateGetDeclaredMethods(true),
3204 name,
3205 parameterTypes)) != null) {
3206 if (includeStaticMethods || !Modifier.isStatic(res.getModifiers()))
3207 return res;
3208 }
3209 // Search superclass's methods
3210 if (!isInterface()) {
3211 Class<? super T> c = getSuperclass();
3212 if (c != null) {
3213 if ((res = c.getMethod0(name, parameterTypes, true)) != null) {
3214 return res;
3215 }
3216 }
3217 }
3218 // Search superinterfaces' methods
3219 Class<?>[] interfaces = getInterfaces();
3220 for (Class<?> c : interfaces)
3221 if ((res = c.getMethod0(name, parameterTypes, false)) != null)
3222 allInterfaceCandidates.add(res);
3223 // Not found
3224 return null;
3225 }
3226
3227 private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
3228 int which) throws NoSuchMethodException
3229 {
3230 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
3231 for (Constructor<T> constructor : constructors) {
3232 if (arrayContentsEq(parameterTypes,
3233 constructor.getParameterTypes())) {
3234 return getReflectionFactory().copyConstructor(constructor);
3235 }
3236 }
3237 throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes));
3238 }
3239
3240 //
3241 // Other helpers and base implementation
3242 //
3243
3244 private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
3245 if (a1 == null) {
3246 return a2 == null || a2.length == 0;
3247 }
3248
3249 if (a2 == null) {
3250 return a1.length == 0;
3251 }
3252
3253 if (a1.length != a2.length) {
3254 return false;
3255 }
3256
3257 for (int i = 0; i < a1.length; i++) {
3258 if (a1[i] != a2[i]) {
3259 return false;
3260 }
3261 }
3262
3263 return true;
3264 }
3265
3266 private static Field[] copyFields(Field[] arg) {
3267 Field[] out = new Field[arg.length];
3268 ReflectionFactory fact = getReflectionFactory();
3269 for (int i = 0; i < arg.length; i++) {
3270 out[i] = fact.copyField(arg[i]);
3271 }
3272 return out;
3273 }
3274
3275 private static Method[] copyMethods(Method[] arg) {
3276 Method[] out = new Method[arg.length];
3277 ReflectionFactory fact = getReflectionFactory();
3278 for (int i = 0; i < arg.length; i++) {
3279 out[i] = fact.copyMethod(arg[i]);
3280 }
3281 return out;
3282 }
3283
3284 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
3285 Constructor<U>[] out = arg.clone();
3286 ReflectionFactory fact = getReflectionFactory();
3287 for (int i = 0; i < out.length; i++) {
3288 out[i] = fact.copyConstructor(out[i]);
3289 }
3290 return out;
3291 }
3292
3293 private native Field[] getDeclaredFields0(boolean publicOnly);
3294 private native Method[] getDeclaredMethods0(boolean publicOnly);
3295 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
3296 private native Class<?>[] getDeclaredClasses0();
3297
3298 private static String argumentTypesToString(Class<?>[] argTypes) {
3299 StringJoiner sj = new StringJoiner(", ", "(", ")");
3300 if (argTypes != null) {
3301 for (int i = 0; i < argTypes.length; i++) {
3302 Class<?> c = argTypes[i];
3303 sj.add((c == null) ? "null" : c.getName());
3304 }
3305 }
3306 return sj.toString();
3307 }
3308
3309 /** use serialVersionUID from JDK 1.1 for interoperability */
3310 private static final long serialVersionUID = 3206093459760846163L;
3311
3312
3313 /**
3314 * Class Class is special cased within the Serialization Stream Protocol.
3315 *
3316 * A Class instance is written initially into an ObjectOutputStream in the
3317 * following format:
3318 * <pre>
3319 * {@code TC_CLASS} ClassDescriptor
3320 * A ClassDescriptor is a special cased serialization of
3321 * a {@code java.io.ObjectStreamClass} instance.
3322 * </pre>
3323 * A new handle is generated for the initial time the class descriptor
3324 * is written into the stream. Future references to the class descriptor
3325 * are written as references to the initial class descriptor instance.
3326 *
3327 * @see java.io.ObjectStreamClass
3328 */
3329 private static final ObjectStreamField[] serialPersistentFields =
3330 new ObjectStreamField[0];
3331
3332
3333 /**
3334 * Returns the assertion status that would be assigned to this
3335 * class if it were to be initialized at the time this method is invoked.
3336 * If this class has had its assertion status set, the most recent
3337 * setting will be returned; otherwise, if any package default assertion
3338 * status pertains to this class, the most recent setting for the most
3339 * specific pertinent package default assertion status is returned;
3340 * otherwise, if this class is not a system class (i.e., it has a
3341 * class loader) its class loader's default assertion status is returned;
3342 * otherwise, the system class default assertion status is returned.
3343 * <p>
3344 * Few programmers will have any need for this method; it is provided
3345 * for the benefit of the JRE itself. (It allows a class to determine at
3346 * the time that it is initialized whether assertions should be enabled.)
3347 * Note that this method is not guaranteed to return the actual
3348 * assertion status that was (or will be) associated with the specified
3349 * class when it was (or will be) initialized.
3350 *
3351 * @return the desired assertion status of the specified class.
3352 * @see java.lang.ClassLoader#setClassAssertionStatus
3353 * @see java.lang.ClassLoader#setPackageAssertionStatus
3354 * @see java.lang.ClassLoader#setDefaultAssertionStatus
3355 * @since 1.4
3356 */
3357 public boolean desiredAssertionStatus() {
3358 ClassLoader loader = getClassLoader();
3359 // If the loader is null this is a system class, so ask the VM
3360 if (loader == null)
3361 return desiredAssertionStatus0(this);
3362
3363 // If the classloader has been initialized with the assertion
3364 // directives, ask it. Otherwise, ask the VM.
3365 synchronized(loader.assertionLock) {
3366 if (loader.classAssertionStatus != null) {
3367 return loader.desiredAssertionStatus(getName());
3368 }
3369 }
3370 return desiredAssertionStatus0(this);
3371 }
3372
3373 // Retrieves the desired assertion status of this class from the VM
3374 private static native boolean desiredAssertionStatus0(Class<?> clazz);
3375
3376 /**
3377 * Returns true if and only if this class was declared as an enum in the
3378 * source code.
3379 *
3380 * @return true if and only if this class was declared as an enum in the
3381 * source code
3382 * @since 1.5
3383 */
3384 public boolean isEnum() {
3385 // An enum must both directly extend java.lang.Enum and have
3386 // the ENUM bit set; classes for specialized enum constants
3387 // don't do the former.
3388 return (this.getModifiers() & ENUM) != 0 &&
3389 this.getSuperclass() == java.lang.Enum.class;
3390 }
3391
3392 // Fetches the factory for reflective objects
3393 private static ReflectionFactory getReflectionFactory() {
3394 if (reflectionFactory == null) {
3395 reflectionFactory =
3396 java.security.AccessController.doPrivileged
3397 (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction());
3398 }
3399 return reflectionFactory;
3400 }
3401 private static ReflectionFactory reflectionFactory;
3402
3403 // To be able to query system properties as soon as they're available
3404 private static boolean initted = false;
3405 private static void checkInitted() {
3406 if (initted) return;
3407 AccessController.doPrivileged(new PrivilegedAction<Void>() {
3408 public Void run() {
3409 // Tests to ensure the system properties table is fully
3410 // initialized. This is needed because reflection code is
3411 // called very early in the initialization process (before
3412 // command-line arguments have been parsed and therefore
3413 // these user-settable properties installed.) We assume that
3414 // if System.out is non-null then the System class has been
3415 // fully initialized and that the bulk of the startup code
3416 // has been run.
3417
3418 if (System.out == null) {
3419 // java.lang.System not yet fully initialized
3420 return null;
3421 }
3422
3423 // Doesn't use Boolean.getBoolean to avoid class init.
3424 String val =
3425 System.getProperty("sun.reflect.noCaches");
3426 if (val != null && val.equals("true")) {
3427 useCaches = false;
3428 }
3429
3430 initted = true;
3431 return null;
3432 }
3433 });
3434 }
3435
3436 /**
3437 * Returns the elements of this enum class or null if this
3438 * Class object does not represent an enum type.
3439 *
3440 * @return an array containing the values comprising the enum class
3441 * represented by this Class object in the order they're
3442 * declared, or null if this Class object does not
3443 * represent an enum type
3444 * @since 1.5
3445 */
3446 public T[] getEnumConstants() {
3447 T[] values = getEnumConstantsShared();
3448 return (values != null) ? values.clone() : null;
3449 }
3450
3451 /**
3452 * Returns the elements of this enum class or null if this
3453 * Class object does not represent an enum type;
3454 * identical to getEnumConstants except that the result is
3455 * uncloned, cached, and shared by all callers.
3456 */
3457 T[] getEnumConstantsShared() {
3458 if (enumConstants == null) {
3459 if (!isEnum()) return null;
3460 try {
3461 final Method values = getMethod("values");
3462 java.security.AccessController.doPrivileged(
3463 new java.security.PrivilegedAction<Void>() {
3464 public Void run() {
3465 values.setAccessible(true);
3466 return null;
3467 }
3468 });
3469 @SuppressWarnings("unchecked")
3470 T[] temporaryConstants = (T[])values.invoke(null);
3471 enumConstants = temporaryConstants;
3472 }
3473 // These can happen when users concoct enum-like classes
3474 // that don't comply with the enum spec.
3475 catch (InvocationTargetException | NoSuchMethodException |
3476 IllegalAccessException ex) { return null; }
3477 }
3478 return enumConstants;
3479 }
3480 private volatile transient T[] enumConstants = null;
3481
3482 /**
3483 * Returns a map from simple name to enum constant. This package-private
3484 * method is used internally by Enum to implement
3485 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
3486 * efficiently. Note that the map is returned by this method is
3487 * created lazily on first use. Typically it won't ever get created.
3488 */
3489 Map<String, T> enumConstantDirectory() {
3490 if (enumConstantDirectory == null) {
3491 T[] universe = getEnumConstantsShared();
3492 if (universe == null)
3493 throw new IllegalArgumentException(
3494 getName() + " is not an enum type");
3495 Map<String, T> m = new HashMap<>(2 * universe.length);
3496 for (T constant : universe)
3497 m.put(((Enum<?>)constant).name(), constant);
3498 enumConstantDirectory = m;
3499 }
3500 return enumConstantDirectory;
3501 }
3502 private volatile transient Map<String, T> enumConstantDirectory = null;
3503
3504 /**
3505 * Casts an object to the class or interface represented
3506 * by this {@code Class} object.
3507 *
3508 * @param obj the object to be cast
3509 * @return the object after casting, or null if obj is null
3510 *
3511 * @throws ClassCastException if the object is not
3512 * null and is not assignable to the type T.
3513 *
3514 * @since 1.5
3515 */
3516 @SuppressWarnings("unchecked")
3517 public T cast(Object obj) {
3518 if (obj != null && !isInstance(obj))
3519 throw new ClassCastException(cannotCastMsg(obj));
3520 return (T) obj;
3521 }
3522
3523 private String cannotCastMsg(Object obj) {
3524 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3525 }
3526
3527 /**
3528 * Casts this {@code Class} object to represent a subclass of the class
3529 * represented by the specified class object. Checks that the cast
3530 * is valid, and throws a {@code ClassCastException} if it is not. If
3531 * this method succeeds, it always returns a reference to this class object.
3532 *
3533 * <p>This method is useful when a client needs to "narrow" the type of
3534 * a {@code Class} object to pass it to an API that restricts the
3535 * {@code Class} objects that it is willing to accept. A cast would
3536 * generate a compile-time warning, as the correctness of the cast
3537 * could not be checked at runtime (because generic types are implemented
3538 * by erasure).
3539 *
3540 * @param <U> the type to cast this class object to
3541 * @param clazz the class of the type to cast this class object to
3542 * @return this {@code Class} object, cast to represent a subclass of
3543 * the specified class object.
3544 * @throws ClassCastException if this {@code Class} object does not
3545 * represent a subclass of the specified class (here "subclass" includes
3546 * the class itself).
3547 * @since 1.5
3548 */
3549 @SuppressWarnings("unchecked")
3550 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3551 if (clazz.isAssignableFrom(this))
3552 return (Class<? extends U>) this;
3553 else
3554 throw new ClassCastException(this.toString());
3555 }
3556
3557 /**
3558 * @throws NullPointerException {@inheritDoc}
3559 * @since 1.5
3560 */
3561 @SuppressWarnings("unchecked")
3562 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3563 Objects.requireNonNull(annotationClass);
3564
3565 return (A) annotationData().annotations.get(annotationClass);
3566 }
3567
3568 /**
3569 * {@inheritDoc}
3570 * @throws NullPointerException {@inheritDoc}
3571 * @since 1.5
3572 */
3573 @Override
3574 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3575 return GenericDeclaration.super.isAnnotationPresent(annotationClass);
3576 }
3577
3578 /**
3579 * @throws NullPointerException {@inheritDoc}
3580 * @since 1.8
3581 */
3582 @Override
3583 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
3584 Objects.requireNonNull(annotationClass);
3585
3586 AnnotationData annotationData = annotationData();
3587 return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
3588 this,
3589 annotationClass);
3590 }
3591
3592 /**
3593 * @since 1.5
3594 */
3595 public Annotation[] getAnnotations() {
3596 return AnnotationParser.toArray(annotationData().annotations);
3597 }
3598
3599 /**
3600 * @throws NullPointerException {@inheritDoc}
3601 * @since 1.8
3602 */
3603 @Override
3604 @SuppressWarnings("unchecked")
3605 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3606 Objects.requireNonNull(annotationClass);
3607
3608 return (A) annotationData().declaredAnnotations.get(annotationClass);
3609 }
3610
3611 /**
3612 * @throws NullPointerException {@inheritDoc}
3613 * @since 1.8
3614 */
3615 @Override
3616 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
3617 Objects.requireNonNull(annotationClass);
3618
3619 return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
3620 annotationClass);
3621 }
3622
3623 /**
3624 * @since 1.5
3625 */
3626 public Annotation[] getDeclaredAnnotations() {
3627 return AnnotationParser.toArray(annotationData().declaredAnnotations);
3628 }
3629
3630 // annotation data that might get invalidated when JVM TI RedefineClasses() is called
3631 private static class AnnotationData {
3632 final Map<Class<? extends Annotation>, Annotation> annotations;
3633 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3634
3635 // Value of classRedefinedCount when we created this AnnotationData instance
3636 final int redefinedCount;
3637
3638 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
3639 Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
3640 int redefinedCount) {
3641 this.annotations = annotations;
3642 this.declaredAnnotations = declaredAnnotations;
3643 this.redefinedCount = redefinedCount;
3644 }
3645 }
3646
3647 // Annotations cache
3648 @SuppressWarnings("UnusedDeclaration")
3649 private volatile transient AnnotationData annotationData;
3650
3651 private AnnotationData annotationData() {
3652 while (true) { // retry loop
3653 AnnotationData annotationData = this.annotationData;
3654 int classRedefinedCount = this.classRedefinedCount;
3655 if (annotationData != null &&
3656 annotationData.redefinedCount == classRedefinedCount) {
3657 return annotationData;
3658 }
3659 // null or stale annotationData -> optimistically create new instance
3660 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
3661 // try to install it
3662 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
3663 // successfully installed new AnnotationData
3664 return newAnnotationData;
3665 }
3666 }
3667 }
3668
3669 private AnnotationData createAnnotationData(int classRedefinedCount) {
3670 Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
3671 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
3672 Class<?> superClass = getSuperclass();
3673 Map<Class<? extends Annotation>, Annotation> annotations = null;
3674 if (superClass != null) {
3675 Map<Class<? extends Annotation>, Annotation> superAnnotations =
3676 superClass.annotationData().annotations;
3677 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
3678 Class<? extends Annotation> annotationClass = e.getKey();
3679 if (AnnotationType.getInstance(annotationClass).isInherited()) {
3680 if (annotations == null) { // lazy construction
3681 annotations = new LinkedHashMap<>((Math.max(
3682 declaredAnnotations.size(),
3683 Math.min(12, declaredAnnotations.size() + superAnnotations.size())
3684 ) * 4 + 2) / 3
3685 );
3686 }
3687 annotations.put(annotationClass, e.getValue());
3688 }
3689 }
3690 }
3691 if (annotations == null) {
3692 // no inherited annotations -> share the Map with declaredAnnotations
3693 annotations = declaredAnnotations;
3694 } else {
3695 // at least one inherited annotation -> declared may override inherited
3696 annotations.putAll(declaredAnnotations);
3697 }
3698 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
3699 }
3700
3701 // Annotation types cache their internal (AnnotationType) form
3702
3703 @SuppressWarnings("UnusedDeclaration")
3704 private volatile transient AnnotationType annotationType;
3705
3706 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
3707 return Atomic.casAnnotationType(this, oldType, newType);
3708 }
3709
3710 AnnotationType getAnnotationType() {
3711 return annotationType;
3712 }
3713
3714 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() {
3715 return annotationData().declaredAnnotations;
3716 }
3717
3718 /* Backing store of user-defined values pertaining to this class.
3719 * Maintained by the ClassValue class.
3720 */
3721 transient ClassValue.ClassValueMap classValueMap;
3722
3723 /**
3724 * Returns an {@code AnnotatedType} object that represents the use of a
3725 * type to specify the superclass of the entity represented by this {@code
3726 * Class} object. (The <em>use</em> of type Foo to specify the superclass
3727 * in '... extends Foo' is distinct from the <em>declaration</em> of type
3728 * Foo.)
3729 *
3730 * <p> If this {@code Class} object represents a type whose declaration
3731 * does not explicitly indicate an annotated superclass, then the return
3732 * value is an {@code AnnotatedType} object representing an element with no
3733 * annotations.
3734 *
3735 * <p> If this {@code Class} represents either the {@code Object} class, an
3736 * interface type, an array type, a primitive type, or void, the return
3737 * value is {@code null}.
3738 *
3739 * @return an object representing the superclass
3740 * @since 1.8
3741 */
3742 public AnnotatedType getAnnotatedSuperclass() {
3743 if (this == Object.class ||
3744 isInterface() ||
3745 isArray() ||
3746 isPrimitive() ||
3747 this == Void.TYPE) {
3748 return null;
3749 }
3750
3751 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
3752 }
3753
3754 /**
3755 * Returns an array of {@code AnnotatedType} objects that represent the use
3756 * of types to specify superinterfaces of the entity represented by this
3757 * {@code Class} object. (The <em>use</em> of type Foo to specify a
3758 * superinterface in '... implements Foo' is distinct from the
3759 * <em>declaration</em> of type Foo.)
3760 *
3761 * <p> If this {@code Class} object represents a class, the return value is
3762 * an array containing objects representing the uses of interface types to
3763 * specify interfaces implemented by the class. The order of the objects in
3764 * the array corresponds to the order of the interface types used in the
3765 * 'implements' clause of the declaration of this {@code Class} object.
3766 *
3767 * <p> If this {@code Class} object represents an interface, the return
3768 * value is an array containing objects representing the uses of interface
3769 * types to specify interfaces directly extended by the interface. The
3770 * order of the objects in the array corresponds to the order of the
3771 * interface types used in the 'extends' clause of the declaration of this
3772 * {@code Class} object.
3773 *
3774 * <p> If this {@code Class} object represents a class or interface whose
3775 * declaration does not explicitly indicate any annotated superinterfaces,
3776 * the return value is an array of length 0.
3777 *
3778 * <p> If this {@code Class} object represents either the {@code Object}
3779 * class, an array type, a primitive type, or void, the return value is an
3780 * array of length 0.
3781 *
3782 * @return an array representing the superinterfaces
3783 * @since 1.8
3784 */
3785 public AnnotatedType[] getAnnotatedInterfaces() {
3786 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
3787 }
3788 }