1 /*
2 * Copyright (c) 1994, 2016, 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.annotation.Annotation;
29 import java.lang.module.ModuleReader;
30 import java.lang.reflect.AnnotatedElement;
31 import java.lang.reflect.Array;
32 import java.lang.reflect.GenericArrayType;
33 import java.lang.reflect.GenericDeclaration;
34 import java.lang.reflect.Member;
35 import java.lang.reflect.Field;
36 import java.lang.reflect.Executable;
37 import java.lang.reflect.Method;
38 import java.lang.reflect.Module;
39 import java.lang.reflect.Constructor;
40 import java.lang.reflect.Modifier;
41 import java.lang.reflect.Type;
42 import java.lang.reflect.TypeVariable;
43 import java.lang.reflect.InvocationTargetException;
44 import java.lang.reflect.AnnotatedType;
45 import java.lang.reflect.Proxy;
46 import java.lang.ref.SoftReference;
47 import java.io.IOException;
48 import java.io.InputStream;
49 import java.io.ObjectStreamField;
50 import java.net.URL;
51 import java.security.AccessController;
52 import java.security.PrivilegedAction;
53 import java.util.ArrayList;
54 import java.util.Arrays;
55 import java.util.Collection;
56 import java.util.HashSet;
57 import java.util.LinkedHashMap;
58 import java.util.List;
59 import java.util.Set;
60 import java.util.Map;
61 import java.util.HashMap;
62 import java.util.Objects;
63 import java.util.StringJoiner;
64 import jdk.internal.HotSpotIntrinsicCandidate;
65 import jdk.internal.loader.BootLoader;
66 import jdk.internal.loader.BuiltinClassLoader;
67 import jdk.internal.misc.Unsafe;
68 import jdk.internal.misc.VM;
69 import jdk.internal.reflect.CallerSensitive;
70 import jdk.internal.reflect.ConstantPool;
71 import jdk.internal.reflect.Reflection;
72 import jdk.internal.reflect.ReflectionFactory;
73 import jdk.internal.vm.annotation.ForceInline;
74 import sun.reflect.generics.factory.CoreReflectionFactory;
75 import sun.reflect.generics.factory.GenericsFactory;
76 import sun.reflect.generics.repository.ClassRepository;
77 import sun.reflect.generics.repository.MethodRepository;
78 import sun.reflect.generics.repository.ConstructorRepository;
79 import sun.reflect.generics.scope.ClassScope;
80 import sun.security.util.SecurityConstants;
81 import sun.reflect.annotation.*;
82 import sun.reflect.misc.ReflectUtil;
83
84 /**
85 * Instances of the class {@code Class} represent classes and
86 * interfaces in a running Java application. An enum is a kind of
87 * class and an annotation is a kind of interface. Every array also
88 * belongs to a class that is reflected as a {@code Class} object
89 * that is shared by all arrays with the same element type and number
90 * of dimensions. The primitive Java types ({@code boolean},
91 * {@code byte}, {@code char}, {@code short},
92 * {@code int}, {@code long}, {@code float}, and
93 * {@code double}), and the keyword {@code void} are also
94 * represented as {@code Class} objects.
95 *
96 * <p> {@code Class} has no public constructor. Instead {@code Class}
97 * objects are constructed automatically by the Java Virtual Machine as classes
98 * are loaded and by calls to the {@code defineClass} method in the class
99 * loader.
100 *
101 * <p> The following example uses a {@code Class} object to print the
102 * class name of an object:
103 *
104 * <blockquote><pre>
105 * void printClassName(Object obj) {
106 * System.out.println("The class of " + obj +
107 * " is " + obj.getClass().getName());
108 * }
109 * </pre></blockquote>
110 *
111 * <p> It is also possible to get the {@code Class} object for a named
112 * type (or for void) using a class literal. See Section 15.8.2 of
113 * <cite>The Java™ Language Specification</cite>.
114 * For example:
115 *
116 * <blockquote>
117 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
118 * </blockquote>
119 *
120 * @param <T> the type of the class modeled by this {@code Class}
121 * object. For example, the type of {@code String.class} is {@code
122 * Class<String>}. Use {@code Class<?>} if the class being modeled is
123 * unknown.
124 *
125 * @author unascribed
126 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
127 * @since 1.0
128 */
129 public final class Class<T> implements java.io.Serializable,
130 GenericDeclaration,
131 Type,
132 AnnotatedElement {
133 private static final int ANNOTATION= 0x00002000;
134 private static final int ENUM = 0x00004000;
135 private static final int SYNTHETIC = 0x00001000;
136
137 private static native void registerNatives();
138 static {
139 registerNatives();
140 }
141
142 /*
143 * Private constructor. Only the Java Virtual Machine creates Class objects.
144 * This constructor is not used and prevents the default constructor being
145 * generated.
146 */
147 private Class(ClassLoader loader, Class<?> arrayComponentType) {
148 // Initialize final field for classLoader. The initialization value of non-null
149 // prevents future JIT optimizations from assuming this final field is null.
150 classLoader = loader;
151 componentType = arrayComponentType;
152 }
153
154 /**
155 * Converts the object to a string. The string representation is the
156 * string "class" or "interface", followed by a space, and then by the
157 * fully qualified name of the class in the format returned by
158 * {@code getName}. If this {@code Class} object represents a
159 * primitive type, this method returns the name of the primitive type. If
160 * this {@code Class} object represents void this method returns
161 * "void". If this {@code Class} object represents an array type,
162 * this method returns "class " followed by {@code getName}.
163 *
164 * @return a string representation of this class object.
165 */
166 public String toString() {
167 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
168 + getName();
169 }
170
171 /**
172 * Returns a string describing this {@code Class}, including
173 * information about modifiers and type parameters.
174 *
175 * The string is formatted as a list of type modifiers, if any,
176 * followed by the kind of type (empty string for primitive types
177 * and {@code class}, {@code enum}, {@code interface}, or
178 * <code>@</code>{@code interface}, as appropriate), followed
179 * by the type's name, followed by an angle-bracketed
180 * comma-separated list of the type's type parameters, if any.
181 *
182 * A space is used to separate modifiers from one another and to
183 * separate any modifiers from the kind of type. The modifiers
184 * occur in canonical order. If there are no type parameters, the
185 * type parameter list is elided.
186 *
187 * For an array type, the string starts with the type name,
188 * followed by an angle-bracketed comma-separated list of the
189 * type's type parameters, if any, followed by a sequence of
190 * {@code []} characters, one set of brackets per dimension of
191 * the array.
192 *
193 * <p>Note that since information about the runtime representation
194 * of a type is being generated, modifiers not present on the
195 * originating source code or illegal on the originating source
196 * code may be present.
197 *
198 * @return a string describing this {@code Class}, including
199 * information about modifiers and type parameters
200 *
201 * @since 1.8
202 */
203 public String toGenericString() {
204 if (isPrimitive()) {
205 return toString();
206 } else {
207 StringBuilder sb = new StringBuilder();
208 Class<?> component = this;
209 int arrayDepth = 0;
210
211 if (isArray()) {
212 do {
213 arrayDepth++;
214 component = component.getComponentType();
215 } while (component.isArray());
216 sb.append(component.getName());
217 } else {
218 // Class modifiers are a superset of interface modifiers
219 int modifiers = getModifiers() & Modifier.classModifiers();
220 if (modifiers != 0) {
221 sb.append(Modifier.toString(modifiers));
222 sb.append(' ');
223 }
224
225 if (isAnnotation()) {
226 sb.append('@');
227 }
228 if (isInterface()) { // Note: all annotation types are interfaces
229 sb.append("interface");
230 } else {
231 if (isEnum())
232 sb.append("enum");
233 else
234 sb.append("class");
235 }
236 sb.append(' ');
237 sb.append(getName());
238 }
239
240 TypeVariable<?>[] typeparms = component.getTypeParameters();
241 if (typeparms.length > 0) {
242 StringJoiner sj = new StringJoiner(",", "<", ">");
243 for(TypeVariable<?> typeparm: typeparms) {
244 sj.add(typeparm.getTypeName());
245 }
246 sb.append(sj.toString());
247 }
248
249 for (int i = 0; i < arrayDepth; i++)
250 sb.append("[]");
251
252 return sb.toString();
253 }
254 }
255
256 /**
257 * Returns the {@code Class} object associated with the class or
258 * interface with the given string name. Invoking this method is
259 * equivalent to:
260 *
261 * <blockquote>
262 * {@code Class.forName(className, true, currentLoader)}
263 * </blockquote>
264 *
265 * where {@code currentLoader} denotes the defining class loader of
266 * the current class.
267 *
268 * <p> For example, the following code fragment returns the
269 * runtime {@code Class} descriptor for the class named
270 * {@code java.lang.Thread}:
271 *
272 * <blockquote>
273 * {@code Class t = Class.forName("java.lang.Thread")}
274 * </blockquote>
275 * <p>
276 * A call to {@code forName("X")} causes the class named
277 * {@code X} to be initialized.
278 *
279 * @param className the fully qualified name of the desired class.
280 * @return the {@code Class} object for the class with the
281 * specified name.
282 * @exception LinkageError if the linkage fails
283 * @exception ExceptionInInitializerError if the initialization provoked
284 * by this method fails
285 * @exception ClassNotFoundException if the class cannot be located
286 */
287 @CallerSensitive
288 public static Class<?> forName(String className)
289 throws ClassNotFoundException {
290 Class<?> caller = Reflection.getCallerClass();
291 return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
292 }
293
294
295 /**
296 * Returns the {@code Class} object associated with the class or
297 * interface with the given string name, using the given class loader.
298 * Given the fully qualified name for a class or interface (in the same
299 * format returned by {@code getName}) this method attempts to
300 * locate, load, and link the class or interface. The specified class
301 * loader is used to load the class or interface. If the parameter
302 * {@code loader} is null, the class is loaded through the bootstrap
303 * class loader. The class is initialized only if the
304 * {@code initialize} parameter is {@code true} and if it has
305 * not been initialized earlier.
306 *
307 * <p> If {@code name} denotes a primitive type or void, an attempt
308 * will be made to locate a user-defined class in the unnamed package whose
309 * name is {@code name}. Therefore, this method cannot be used to
310 * obtain any of the {@code Class} objects representing primitive
311 * types or void.
312 *
313 * <p> If {@code name} denotes an array class, the component type of
314 * the array class is loaded but not initialized.
315 *
316 * <p> For example, in an instance method the expression:
317 *
318 * <blockquote>
319 * {@code Class.forName("Foo")}
320 * </blockquote>
321 *
322 * is equivalent to:
323 *
324 * <blockquote>
325 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
326 * </blockquote>
327 *
328 * Note that this method throws errors related to loading, linking or
329 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
330 * Java Language Specification</em>.
331 * Note that this method does not check whether the requested class
332 * is accessible to its caller.
333 *
334 * @param name fully qualified name of the desired class
335 * @param initialize if {@code true} the class will be initialized.
336 * See Section 12.4 of <em>The Java Language Specification</em>.
337 * @param loader class loader from which the class must be loaded
338 * @return class object representing the desired class
339 *
340 * @exception LinkageError if the linkage fails
341 * @exception ExceptionInInitializerError if the initialization provoked
342 * by this method fails
343 * @exception ClassNotFoundException if the class cannot be located by
344 * the specified class loader
345 * @exception SecurityException
346 * if a security manager is present, and the {@code loader} is
347 * {@code null}, and the caller's class loader is not
348 * {@code null}, and the caller does not have the
349 * {@link RuntimePermission}{@code ("getClassLoader")}
350 *
351 * @see java.lang.Class#forName(String)
352 * @see java.lang.ClassLoader
353 * @since 1.2
354 */
355 @CallerSensitive
356 public static Class<?> forName(String name, boolean initialize,
357 ClassLoader loader)
358 throws ClassNotFoundException
359 {
360 Class<?> caller = null;
361 SecurityManager sm = System.getSecurityManager();
362 if (sm != null) {
363 // Reflective call to get caller class is only needed if a security manager
364 // is present. Avoid the overhead of making this call otherwise.
365 caller = Reflection.getCallerClass();
366 if (VM.isSystemDomainLoader(loader)) {
367 ClassLoader ccl = ClassLoader.getClassLoader(caller);
368 if (!VM.isSystemDomainLoader(ccl)) {
369 sm.checkPermission(
370 SecurityConstants.GET_CLASSLOADER_PERMISSION);
371 }
372 }
373 }
374 return forName0(name, initialize, loader, caller);
375 }
376
377 /** Called after security check for system loader access checks have been made. */
378 private static native Class<?> forName0(String name, boolean initialize,
379 ClassLoader loader,
380 Class<?> caller)
381 throws ClassNotFoundException;
382
383
384 /**
385 * Returns the {@code Class} with the given <a href="ClassLoader.html#name">
386 * binary name</a> in the given module.
387 *
388 * <p> This method attempts to locate, load, and link the class or interface.
389 * It does not run the class initializer. If the class is not found, this
390 * method returns {@code null}. </p>
391 *
392 * <p> If the class loader of the given module defines other modules and
393 * the given name is a class defined in a different module, this method
394 * returns {@code null} after the class is loaded. </p>
395 *
396 * <p> This method does not check whether the requested class is
397 * accessible to its caller. </p>
398 *
399 * @apiNote
400 * This method returns {@code null} on failure rather than
401 * throwing a {@link ClassNotFoundException}, as is done by
402 * the {@link #forName(String, boolean, ClassLoader)} method.
403 * The security check is a stack-based permission check if the caller
404 * loads a class in another module.
405 *
406 * @param module A module
407 * @param name The <a href="ClassLoader.html#name">binary name</a>
408 * of the class
409 * @return {@code Class} object of the given name defined in the given module;
410 * {@code null} if not found.
411 *
412 * @throws NullPointerException if the given module or name is {@code null}
413 *
414 * @throws LinkageError if the linkage fails
415 *
416 * @throws SecurityException
417 * <ul>
418 * <li> if the caller is not the specified module and
419 * {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
420 * <li> access to the module content is denied. For example,
421 * permission check will be performed when a class loader calls
422 * {@link ModuleReader#open(String)} to read the bytes of a class file
423 * in a module.</li>
424 * </ul>
425 *
426 * @since 9
427 */
428 @CallerSensitive
429 public static Class<?> forName(Module module, String name) {
430 Objects.requireNonNull(module);
431 Objects.requireNonNull(name);
432
433 Class<?> caller = Reflection.getCallerClass();
434 if (caller != null && caller.getModule() != module) {
435 // if caller is null, Class.forName is the last java frame on the stack.
436 // java.base has all permissions
437 SecurityManager sm = System.getSecurityManager();
438 if (sm != null) {
439 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
440 }
441 }
442
443 PrivilegedAction<ClassLoader> pa = module::getClassLoader;
444 ClassLoader cl = AccessController.doPrivileged(pa);
445 if (module.isNamed() && cl != null) {
446 return cl.loadLocalClass(module, name);
447 }
448
449 final Class<?> c;
450 if (cl != null) {
451 c = cl.loadLocalClass(name);
452 } else {
453 c = BootLoader.loadClassOrNull(name);
454 }
455
456 if (c != null && c.getModule() == module) {
457 return c;
458 } else {
459 return null;
460 }
461 }
462
463 /**
464 * Creates a new instance of the class represented by this {@code Class}
465 * object. The class is instantiated as if by a {@code new}
466 * expression with an empty argument list. The class is initialized if it
467 * has not already been initialized.
468 *
469 * @deprecated This method propagates any exception thrown by the
470 * nullary constructor, including a checked exception. Use of
471 * this method effectively bypasses the compile-time exception
472 * checking that would otherwise be performed by the compiler.
473 * The {@link
474 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
475 * Constructor.newInstance} method avoids this problem by wrapping
476 * any exception thrown by the constructor in a (checked) {@link
477 * java.lang.reflect.InvocationTargetException}.
478 *
479 * <p>The call
480 *
481 * <pre>{@code
482 * clazz.newInstance()
483 * }</pre>
484 *
485 * can be replaced by
486 *
487 * <pre>{@code
488 * clazz.getConstructor().newInstance()
489 * }</pre>
490 *
491 * The latter sequence of calls is inferred to be able to throw
492 * the additional exception types {@link
493 * InvocationTargetException} and {@link
494 * NoSuchMethodException}. Both of these exception types are
495 * subclasses of {@link ReflectiveOperationException}.
496 *
497 * @return a newly allocated instance of the class represented by this
498 * object.
499 * @throws IllegalAccessException if the class or its nullary
500 * constructor is not accessible.
501 * @throws InstantiationException
502 * if this {@code Class} represents an abstract class,
503 * an interface, an array class, a primitive type, or void;
504 * or if the class has no nullary constructor;
505 * or if the instantiation fails for some other reason.
506 * @throws ExceptionInInitializerError if the initialization
507 * provoked by this method fails.
508 * @throws SecurityException
509 * If a security manager, <i>s</i>, is present and
510 * the caller's class loader is not the same as or an
511 * ancestor of the class loader for the current class and
512 * invocation of {@link SecurityManager#checkPackageAccess
513 * s.checkPackageAccess()} denies access to the package
514 * of this class.
515 */
516 @CallerSensitive
517 @Deprecated(since="9")
518 public T newInstance()
519 throws InstantiationException, IllegalAccessException
520 {
521 if (System.getSecurityManager() != null) {
522 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
523 }
524
525 // NOTE: the following code may not be strictly correct under
526 // the current Java memory model.
527
528 // Constructor lookup
529 if (cachedConstructor == null) {
530 if (this == Class.class) {
531 throw new IllegalAccessException(
532 "Can not call newInstance() on the Class for java.lang.Class"
533 );
534 }
535 try {
536 Class<?>[] empty = {};
537 final Constructor<T> c = getConstructor0(empty, Member.DECLARED);
538 // Disable accessibility checks on the constructor
539 // since we have to do the security check here anyway
540 // (the stack depth is wrong for the Constructor's
541 // security check to work)
542 java.security.AccessController.doPrivileged(
543 new java.security.PrivilegedAction<>() {
544 public Void run() {
545 c.setAccessible(true);
546 return null;
547 }
548 });
549 cachedConstructor = c;
550 } catch (NoSuchMethodException e) {
551 throw (InstantiationException)
552 new InstantiationException(getName()).initCause(e);
553 }
554 }
555 Constructor<T> tmpConstructor = cachedConstructor;
556 // Security check (same as in java.lang.reflect.Constructor)
557 Class<?> caller = Reflection.getCallerClass();
558 if (newInstanceCallerCache != caller) {
559 int modifiers = tmpConstructor.getModifiers();
560 Reflection.ensureMemberAccess(caller, this, null, modifiers);
561 newInstanceCallerCache = caller;
562 }
563 // Run constructor
564 try {
565 return tmpConstructor.newInstance((Object[])null);
566 } catch (InvocationTargetException e) {
567 Unsafe.getUnsafe().throwException(e.getTargetException());
568 // Not reached
569 return null;
570 }
571 }
572 private transient volatile Constructor<T> cachedConstructor;
573 private transient volatile Class<?> newInstanceCallerCache;
574
575
576 /**
577 * Determines if the specified {@code Object} is assignment-compatible
578 * with the object represented by this {@code Class}. This method is
579 * the dynamic equivalent of the Java language {@code instanceof}
580 * operator. The method returns {@code true} if the specified
581 * {@code Object} argument is non-null and can be cast to the
582 * reference type represented by this {@code Class} object without
583 * raising a {@code ClassCastException.} It returns {@code false}
584 * otherwise.
585 *
586 * <p> Specifically, if this {@code Class} object represents a
587 * declared class, this method returns {@code true} if the specified
588 * {@code Object} argument is an instance of the represented class (or
589 * of any of its subclasses); it returns {@code false} otherwise. If
590 * this {@code Class} object represents an array class, this method
591 * returns {@code true} if the specified {@code Object} argument
592 * can be converted to an object of the array class by an identity
593 * conversion or by a widening reference conversion; it returns
594 * {@code false} otherwise. If this {@code Class} object
595 * represents an interface, this method returns {@code true} if the
596 * class or any superclass of the specified {@code Object} argument
597 * implements this interface; it returns {@code false} otherwise. If
598 * this {@code Class} object represents a primitive type, this method
599 * returns {@code false}.
600 *
601 * @param obj the object to check
602 * @return true if {@code obj} is an instance of this class
603 *
604 * @since 1.1
605 */
606 @HotSpotIntrinsicCandidate
607 public native boolean isInstance(Object obj);
608
609
610 /**
611 * Determines if the class or interface represented by this
612 * {@code Class} object is either the same as, or is a superclass or
613 * superinterface of, the class or interface represented by the specified
614 * {@code Class} parameter. It returns {@code true} if so;
615 * otherwise it returns {@code false}. If this {@code Class}
616 * object represents a primitive type, this method returns
617 * {@code true} if the specified {@code Class} parameter is
618 * exactly this {@code Class} object; otherwise it returns
619 * {@code false}.
620 *
621 * <p> Specifically, this method tests whether the type represented by the
622 * specified {@code Class} parameter can be converted to the type
623 * represented by this {@code Class} object via an identity conversion
624 * or via a widening reference conversion. See <em>The Java Language
625 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
626 *
627 * @param cls the {@code Class} object to be checked
628 * @return the {@code boolean} value indicating whether objects of the
629 * type {@code cls} can be assigned to objects of this class
630 * @exception NullPointerException if the specified Class parameter is
631 * null.
632 * @since 1.1
633 */
634 @HotSpotIntrinsicCandidate
635 public native boolean isAssignableFrom(Class<?> cls);
636
637
638 /**
639 * Determines if the specified {@code Class} object represents an
640 * interface type.
641 *
642 * @return {@code true} if this object represents an interface;
643 * {@code false} otherwise.
644 */
645 @HotSpotIntrinsicCandidate
646 public native boolean isInterface();
647
648
649 /**
650 * Determines if this {@code Class} object represents an array class.
651 *
652 * @return {@code true} if this object represents an array class;
653 * {@code false} otherwise.
654 * @since 1.1
655 */
656 @HotSpotIntrinsicCandidate
657 public native boolean isArray();
658
659
660 /**
661 * Determines if the specified {@code Class} object represents a
662 * primitive type.
663 *
664 * <p> There are nine predefined {@code Class} objects to represent
665 * the eight primitive types and void. These are created by the Java
666 * Virtual Machine, and have the same names as the primitive types that
667 * they represent, namely {@code boolean}, {@code byte},
668 * {@code char}, {@code short}, {@code int},
669 * {@code long}, {@code float}, and {@code double}.
670 *
671 * <p> These objects may only be accessed via the following public static
672 * final variables, and are the only {@code Class} objects for which
673 * this method returns {@code true}.
674 *
675 * @return true if and only if this class represents a primitive type
676 *
677 * @see java.lang.Boolean#TYPE
678 * @see java.lang.Character#TYPE
679 * @see java.lang.Byte#TYPE
680 * @see java.lang.Short#TYPE
681 * @see java.lang.Integer#TYPE
682 * @see java.lang.Long#TYPE
683 * @see java.lang.Float#TYPE
684 * @see java.lang.Double#TYPE
685 * @see java.lang.Void#TYPE
686 * @since 1.1
687 */
688 @HotSpotIntrinsicCandidate
689 public native boolean isPrimitive();
690
691 /**
692 * Returns true if this {@code Class} object represents an annotation
693 * type. Note that if this method returns true, {@link #isInterface()}
694 * would also return true, as all annotation types are also interfaces.
695 *
696 * @return {@code true} if this class object represents an annotation
697 * type; {@code false} otherwise
698 * @since 1.5
699 */
700 public boolean isAnnotation() {
701 return (getModifiers() & ANNOTATION) != 0;
702 }
703
704 /**
705 * Returns {@code true} if this class is a synthetic class;
706 * returns {@code false} otherwise.
707 * @return {@code true} if and only if this class is a synthetic class as
708 * defined by the Java Language Specification.
709 * @jls 13.1 The Form of a Binary
710 * @since 1.5
711 */
712 public boolean isSynthetic() {
713 return (getModifiers() & SYNTHETIC) != 0;
714 }
715
716 /**
717 * Returns the name of the entity (class, interface, array class,
718 * primitive type, or void) represented by this {@code Class} object,
719 * as a {@code String}.
720 *
721 * <p> If this class object represents a reference type that is not an
722 * array type then the binary name of the class is returned, as specified
723 * by
724 * <cite>The Java™ Language Specification</cite>.
725 *
726 * <p> If this class object represents a primitive type or void, then the
727 * name returned is a {@code String} equal to the Java language
728 * keyword corresponding to the primitive type or void.
729 *
730 * <p> If this class object represents a class of arrays, then the internal
731 * form of the name consists of the name of the element type preceded by
732 * one or more '{@code [}' characters representing the depth of the array
733 * nesting. The encoding of element type names is as follows:
734 *
735 * <blockquote><table summary="Element types and encodings">
736 * <tr><th> Element Type <th> <th> Encoding
737 * <tr><td> boolean <td> <td align=center> Z
738 * <tr><td> byte <td> <td align=center> B
739 * <tr><td> char <td> <td align=center> C
740 * <tr><td> class or interface
741 * <td> <td align=center> L<i>classname</i>;
742 * <tr><td> double <td> <td align=center> D
743 * <tr><td> float <td> <td align=center> F
744 * <tr><td> int <td> <td align=center> I
745 * <tr><td> long <td> <td align=center> J
746 * <tr><td> short <td> <td align=center> S
747 * </table></blockquote>
748 *
749 * <p> The class or interface name <i>classname</i> is the binary name of
750 * the class specified above.
751 *
752 * <p> Examples:
753 * <blockquote><pre>
754 * String.class.getName()
755 * returns "java.lang.String"
756 * byte.class.getName()
757 * returns "byte"
758 * (new Object[3]).getClass().getName()
759 * returns "[Ljava.lang.Object;"
760 * (new int[3][4][5][6][7][8][9]).getClass().getName()
761 * returns "[[[[[[[I"
762 * </pre></blockquote>
763 *
764 * @return the name of the class or interface
765 * represented by this object.
766 */
767 public String getName() {
768 String name = this.name;
769 if (name == null)
770 this.name = name = getName0();
771 return name;
772 }
773
774 // cache the name to reduce the number of calls into the VM
775 private transient String name;
776 private native String getName0();
777
778 /**
779 * Returns the class loader for the class. Some implementations may use
780 * null to represent the bootstrap class loader. This method will return
781 * null in such implementations if this class was loaded by the bootstrap
782 * class loader.
783 *
784 * <p>If this object
785 * represents a primitive type or void, null is returned.
786 *
787 * @return the class loader that loaded the class or interface
788 * represented by this object.
789 * @throws SecurityException
790 * if a security manager is present, and the caller's class loader
791 * is not {@code null} and is not the same as or an ancestor of the
792 * class loader for the class whose class loader is requested,
793 * and the caller does not have the
794 * {@link RuntimePermission}{@code ("getClassLoader")}
795 * @see java.lang.ClassLoader
796 * @see SecurityManager#checkPermission
797 * @see java.lang.RuntimePermission
798 */
799 @CallerSensitive
800 @ForceInline // to ensure Reflection.getCallerClass optimization
801 public ClassLoader getClassLoader() {
802 ClassLoader cl = getClassLoader0();
803 if (cl == null)
804 return null;
805 SecurityManager sm = System.getSecurityManager();
806 if (sm != null) {
807 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
808 }
809 return cl;
810 }
811
812 // Package-private to allow ClassLoader access
813 ClassLoader getClassLoader0() { return classLoader; }
814
815 /**
816 * Returns the module that this class or interface is a member of.
817 *
818 * If this class represents an array type then this method returns the
819 * {@code Module} for the element type. If this class represents a
820 * primitive type or void, then the {@code Module} object for the
821 * {@code java.base} module is returned.
822 *
823 * If this class is in an unnamed module then the {@link
824 * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class
825 * loader for this class is returned.
826 *
827 * @return the module that this class or interface is a member of
828 *
829 * @since 9
830 */
831 public Module getModule() {
832 return module;
833 }
834
835 // set by VM
836 private transient Module module;
837
838 // Initialized in JVM not by private constructor
839 // This field is filtered from reflection access, i.e. getDeclaredField
840 // will throw NoSuchFieldException
841 private final ClassLoader classLoader;
842
843 /**
844 * Returns an array of {@code TypeVariable} objects that represent the
845 * type variables declared by the generic declaration represented by this
846 * {@code GenericDeclaration} object, in declaration order. Returns an
847 * array of length 0 if the underlying generic declaration declares no type
848 * variables.
849 *
850 * @return an array of {@code TypeVariable} objects that represent
851 * the type variables declared by this generic declaration
852 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
853 * signature of this generic declaration does not conform to
854 * the format specified in
855 * <cite>The Java™ Virtual Machine Specification</cite>
856 * @since 1.5
857 */
858 @SuppressWarnings("unchecked")
859 public TypeVariable<Class<T>>[] getTypeParameters() {
860 ClassRepository info = getGenericInfo();
861 if (info != null)
862 return (TypeVariable<Class<T>>[])info.getTypeParameters();
863 else
864 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
865 }
866
867
868 /**
869 * Returns the {@code Class} representing the direct superclass of the
870 * entity (class, interface, primitive type or void) represented by
871 * this {@code Class}. If this {@code Class} represents either the
872 * {@code Object} class, an interface, a primitive type, or void, then
873 * null is returned. If this object represents an array class then the
874 * {@code Class} object representing the {@code Object} class is
875 * returned.
876 *
877 * @return the direct superclass of the class represented by this object
878 */
879 @HotSpotIntrinsicCandidate
880 public native Class<? super T> getSuperclass();
881
882
883 /**
884 * Returns the {@code Type} representing the direct superclass of
885 * the entity (class, interface, primitive type or void) represented by
886 * this {@code Class}.
887 *
888 * <p>If the superclass is a parameterized type, the {@code Type}
889 * object returned must accurately reflect the actual type
890 * parameters used in the source code. The parameterized type
891 * representing the superclass is created if it had not been
892 * created before. See the declaration of {@link
893 * java.lang.reflect.ParameterizedType ParameterizedType} for the
894 * semantics of the creation process for parameterized types. If
895 * this {@code Class} represents either the {@code Object}
896 * class, an interface, a primitive type, or void, then null is
897 * returned. If this object represents an array class then the
898 * {@code Class} object representing the {@code Object} class is
899 * returned.
900 *
901 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
902 * class signature does not conform to the format specified in
903 * <cite>The Java™ Virtual Machine Specification</cite>
904 * @throws TypeNotPresentException if the generic superclass
905 * refers to a non-existent type declaration
906 * @throws java.lang.reflect.MalformedParameterizedTypeException if the
907 * generic superclass refers to a parameterized type that cannot be
908 * instantiated for any reason
909 * @return the direct superclass of the class represented by this object
910 * @since 1.5
911 */
912 public Type getGenericSuperclass() {
913 ClassRepository info = getGenericInfo();
914 if (info == null) {
915 return getSuperclass();
916 }
917
918 // Historical irregularity:
919 // Generic signature marks interfaces with superclass = Object
920 // but this API returns null for interfaces
921 if (isInterface()) {
922 return null;
923 }
924
925 return info.getSuperclass();
926 }
927
928 /**
929 * Gets the package of this class.
930 *
931 * <p>If this class represents an array type, a primitive type or void,
932 * this method returns {@code null}.
933 *
934 * @return the package of this class.
935 */
936 public Package getPackage() {
937 if (isPrimitive() || isArray()) {
938 return null;
939 }
940 ClassLoader cl = getClassLoader0();
941 return cl != null ? cl.definePackage(this)
942 : BootLoader.definePackage(this);
943 }
944
945 /**
946 * Returns the fully qualified package name.
947 *
948 * <p> If this class is a top level class, then this method returns the fully
949 * qualified name of the package that the class is a member of, or the
950 * empty string if the class is in an unnamed package.
951 *
952 * <p> If this class is a member class, then this method is equivalent to
953 * invoking {@code getPackageName()} on the {@link #getEnclosingClass
954 * enclosing class}.
955 *
956 * <p> If this class is a {@link #isLocalClass local class} or an {@link
957 * #isAnonymousClass() anonymous class}, then this method is equivalent to
958 * invoking {@code getPackageName()} on the {@link #getDeclaringClass
959 * declaring class} of the {@link #getEnclosingMethod enclosing method} or
960 * {@link #getEnclosingConstructor enclosing constructor}.
961 *
962 * <p> This method returns {@code null} if this class represents an array type,
963 * a primitive type or void.
964 *
965 * @return the fully qualified package name
966 *
967 * @since 9
968 * @jls 6.7 Fully Qualified Names
969 */
970 public String getPackageName() {
971 String pn = this.packageName;
972 if (pn == null && !isArray() && !isPrimitive()) {
973 String cn = getName();
974 int dot = cn.lastIndexOf('.');
975 pn = (dot != -1) ? cn.substring(0, dot).intern() : "";
976 this.packageName = pn;
977 }
978 return pn;
979 }
980
981 // cached package name
982 private String packageName;
983
984 /**
985 * Returns the interfaces directly implemented by the class or interface
986 * represented by this object.
987 *
988 * <p>If this object represents a class, the return value is an array
989 * containing objects representing all interfaces directly implemented by
990 * the class. The order of the interface objects in the array corresponds
991 * to the order of the interface names in the {@code implements} clause of
992 * the declaration of the class represented by this object. For example,
993 * given the declaration:
994 * <blockquote>
995 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
996 * </blockquote>
997 * suppose the value of {@code s} is an instance of
998 * {@code Shimmer}; the value of the expression:
999 * <blockquote>
1000 * {@code s.getClass().getInterfaces()[0]}
1001 * </blockquote>
1002 * is the {@code Class} object that represents interface
1003 * {@code FloorWax}; and the value of:
1004 * <blockquote>
1005 * {@code s.getClass().getInterfaces()[1]}
1006 * </blockquote>
1007 * is the {@code Class} object that represents interface
1008 * {@code DessertTopping}.
1009 *
1010 * <p>If this object represents an interface, the array contains objects
1011 * representing all interfaces directly extended by the interface. The
1012 * order of the interface objects in the array corresponds to the order of
1013 * the interface names in the {@code extends} clause of the declaration of
1014 * the interface represented by this object.
1015 *
1016 * <p>If this object represents a class or interface that implements no
1017 * interfaces, the method returns an array of length 0.
1018 *
1019 * <p>If this object represents a primitive type or void, the method
1020 * returns an array of length 0.
1021 *
1022 * <p>If this {@code Class} object represents an array type, the
1023 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1024 * returned in that order.
1025 *
1026 * @return an array of interfaces directly implemented by this class
1027 */
1028 public Class<?>[] getInterfaces() {
1029 ReflectionData<T> rd = reflectionData();
1030 if (rd == null) {
1031 // no cloning required
1032 return getInterfaces0();
1033 } else {
1034 Class<?>[] interfaces = rd.interfaces;
1035 if (interfaces == null) {
1036 interfaces = getInterfaces0();
1037 rd.interfaces = interfaces;
1038 }
1039 // defensively copy before handing over to user code
1040 return interfaces.clone();
1041 }
1042 }
1043
1044 private native Class<?>[] getInterfaces0();
1045
1046 /**
1047 * Returns the {@code Type}s representing the interfaces
1048 * directly implemented by the class or interface represented by
1049 * this object.
1050 *
1051 * <p>If a superinterface is a parameterized type, the
1052 * {@code Type} object returned for it must accurately reflect
1053 * the actual type parameters used in the source code. The
1054 * parameterized type representing each superinterface is created
1055 * if it had not been created before. See the declaration of
1056 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
1057 * for the semantics of the creation process for parameterized
1058 * types.
1059 *
1060 * <p>If this object represents a class, the return value is an array
1061 * containing objects representing all interfaces directly implemented by
1062 * the class. The order of the interface objects in the array corresponds
1063 * to the order of the interface names in the {@code implements} clause of
1064 * the declaration of the class represented by this object.
1065 *
1066 * <p>If this object represents an interface, the array contains objects
1067 * representing all interfaces directly extended by the interface. The
1068 * order of the interface objects in the array corresponds to the order of
1069 * the interface names in the {@code extends} clause of the declaration of
1070 * the interface represented by this object.
1071 *
1072 * <p>If this object represents a class or interface that implements no
1073 * interfaces, the method returns an array of length 0.
1074 *
1075 * <p>If this object represents a primitive type or void, the method
1076 * returns an array of length 0.
1077 *
1078 * <p>If this {@code Class} object represents an array type, the
1079 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1080 * returned in that order.
1081 *
1082 * @throws java.lang.reflect.GenericSignatureFormatError
1083 * if the generic class signature does not conform to the format
1084 * specified in
1085 * <cite>The Java™ Virtual Machine Specification</cite>
1086 * @throws TypeNotPresentException if any of the generic
1087 * superinterfaces refers to a non-existent type declaration
1088 * @throws java.lang.reflect.MalformedParameterizedTypeException
1089 * if any of the generic superinterfaces refer to a parameterized
1090 * type that cannot be instantiated for any reason
1091 * @return an array of interfaces directly implemented by this class
1092 * @since 1.5
1093 */
1094 public Type[] getGenericInterfaces() {
1095 ClassRepository info = getGenericInfo();
1096 return (info == null) ? getInterfaces() : info.getSuperInterfaces();
1097 }
1098
1099
1100 /**
1101 * Returns the {@code Class} representing the component type of an
1102 * array. If this class does not represent an array class this method
1103 * returns null.
1104 *
1105 * @return the {@code Class} representing the component type of this
1106 * class if this class is an array
1107 * @see java.lang.reflect.Array
1108 * @since 1.1
1109 */
1110 public Class<?> getComponentType() {
1111 // Only return for array types. Storage may be reused for Class for instance types.
1112 if (isArray()) {
1113 return componentType;
1114 } else {
1115 return null;
1116 }
1117 }
1118
1119 private final Class<?> componentType;
1120
1121
1122 /**
1123 * Returns the Java language modifiers for this class or interface, encoded
1124 * in an integer. The modifiers consist of the Java Virtual Machine's
1125 * constants for {@code public}, {@code protected},
1126 * {@code private}, {@code final}, {@code static},
1127 * {@code abstract} and {@code interface}; they should be decoded
1128 * using the methods of class {@code Modifier}.
1129 *
1130 * <p> If the underlying class is an array class, then its
1131 * {@code public}, {@code private} and {@code protected}
1132 * modifiers are the same as those of its component type. If this
1133 * {@code Class} represents a primitive type or void, its
1134 * {@code public} modifier is always {@code true}, and its
1135 * {@code protected} and {@code private} modifiers are always
1136 * {@code false}. If this object represents an array class, a
1137 * primitive type or void, then its {@code final} modifier is always
1138 * {@code true} and its interface modifier is always
1139 * {@code false}. The values of its other modifiers are not determined
1140 * by this specification.
1141 *
1142 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
1143 * Specification</em>, table 4.1.
1144 *
1145 * @return the {@code int} representing the modifiers for this class
1146 * @see java.lang.reflect.Modifier
1147 * @since 1.1
1148 */
1149 @HotSpotIntrinsicCandidate
1150 public native int getModifiers();
1151
1152
1153 /**
1154 * Gets the signers of this class.
1155 *
1156 * @return the signers of this class, or null if there are no signers. In
1157 * particular, this method returns null if this object represents
1158 * a primitive type or void.
1159 * @since 1.1
1160 */
1161 public native Object[] getSigners();
1162
1163
1164 /**
1165 * Set the signers of this class.
1166 */
1167 native void setSigners(Object[] signers);
1168
1169
1170 /**
1171 * If this {@code Class} object represents a local or anonymous
1172 * class within a method, returns a {@link
1173 * java.lang.reflect.Method Method} object representing the
1174 * immediately enclosing method of the underlying class. Returns
1175 * {@code null} otherwise.
1176 *
1177 * In particular, this method returns {@code null} if the underlying
1178 * class is a local or anonymous class immediately enclosed by a type
1179 * declaration, instance initializer or static initializer.
1180 *
1181 * @return the immediately enclosing method of the underlying class, if
1182 * that class is a local or anonymous class; otherwise {@code null}.
1183 *
1184 * @throws SecurityException
1185 * If a security manager, <i>s</i>, is present and any of the
1186 * following conditions is met:
1187 *
1188 * <ul>
1189 *
1190 * <li> the caller's class loader is not the same as the
1191 * class loader of the enclosing class and invocation of
1192 * {@link SecurityManager#checkPermission
1193 * s.checkPermission} method with
1194 * {@code RuntimePermission("accessDeclaredMembers")}
1195 * denies access to the methods within the enclosing class
1196 *
1197 * <li> the caller's class loader is not the same as or an
1198 * ancestor of the class loader for the enclosing class and
1199 * invocation of {@link SecurityManager#checkPackageAccess
1200 * s.checkPackageAccess()} denies access to the package
1201 * of the enclosing class
1202 *
1203 * </ul>
1204 * @since 1.5
1205 */
1206 @CallerSensitive
1207 public Method getEnclosingMethod() throws SecurityException {
1208 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1209
1210 if (enclosingInfo == null)
1211 return null;
1212 else {
1213 if (!enclosingInfo.isMethod())
1214 return null;
1215
1216 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
1217 getFactory());
1218 Class<?> returnType = toClass(typeInfo.getReturnType());
1219 Type [] parameterTypes = typeInfo.getParameterTypes();
1220 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1221
1222 // Convert Types to Classes; returned types *should*
1223 // be class objects since the methodDescriptor's used
1224 // don't have generics information
1225 for(int i = 0; i < parameterClasses.length; i++)
1226 parameterClasses[i] = toClass(parameterTypes[i]);
1227
1228 // Perform access check
1229 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1230 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1231 Reflection.getCallerClass(), true);
1232 // Client is ok to access declared methods but j.l.Class might not be.
1233 Method[] candidates = AccessController.doPrivileged(
1234 new PrivilegedAction<>() {
1235 @Override
1236 public Method[] run() {
1237 return enclosingCandidate.getDeclaredMethods();
1238 }
1239 });
1240 /*
1241 * Loop over all declared methods; match method name,
1242 * number of and type of parameters, *and* return
1243 * type. Matching return type is also necessary
1244 * because of covariant returns, etc.
1245 */
1246 for(Method m: candidates) {
1247 if (m.getName().equals(enclosingInfo.getName()) ) {
1248 Class<?>[] candidateParamClasses = m.getParameterTypes();
1249 if (candidateParamClasses.length == parameterClasses.length) {
1250 boolean matches = true;
1251 for(int i = 0; i < candidateParamClasses.length; i++) {
1252 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1253 matches = false;
1254 break;
1255 }
1256 }
1257
1258 if (matches) { // finally, check return type
1259 if (m.getReturnType().equals(returnType) )
1260 return m;
1261 }
1262 }
1263 }
1264 }
1265
1266 throw new InternalError("Enclosing method not found");
1267 }
1268 }
1269
1270 private native Object[] getEnclosingMethod0();
1271
1272 private EnclosingMethodInfo getEnclosingMethodInfo() {
1273 Object[] enclosingInfo = getEnclosingMethod0();
1274 if (enclosingInfo == null)
1275 return null;
1276 else {
1277 return new EnclosingMethodInfo(enclosingInfo);
1278 }
1279 }
1280
1281 private static final class EnclosingMethodInfo {
1282 private Class<?> enclosingClass;
1283 private String name;
1284 private String descriptor;
1285
1286 private EnclosingMethodInfo(Object[] enclosingInfo) {
1287 if (enclosingInfo.length != 3)
1288 throw new InternalError("Malformed enclosing method information");
1289 try {
1290 // The array is expected to have three elements:
1291
1292 // the immediately enclosing class
1293 enclosingClass = (Class<?>) enclosingInfo[0];
1294 assert(enclosingClass != null);
1295
1296 // the immediately enclosing method or constructor's
1297 // name (can be null).
1298 name = (String) enclosingInfo[1];
1299
1300 // the immediately enclosing method or constructor's
1301 // descriptor (null iff name is).
1302 descriptor = (String) enclosingInfo[2];
1303 assert((name != null && descriptor != null) || name == descriptor);
1304 } catch (ClassCastException cce) {
1305 throw new InternalError("Invalid type in enclosing method information", cce);
1306 }
1307 }
1308
1309 boolean isPartial() {
1310 return enclosingClass == null || name == null || descriptor == null;
1311 }
1312
1313 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
1314
1315 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
1316
1317 Class<?> getEnclosingClass() { return enclosingClass; }
1318
1319 String getName() { return name; }
1320
1321 String getDescriptor() { return descriptor; }
1322
1323 }
1324
1325 private static Class<?> toClass(Type o) {
1326 if (o instanceof GenericArrayType)
1327 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1328 0)
1329 .getClass();
1330 return (Class<?>)o;
1331 }
1332
1333 /**
1334 * If this {@code Class} object represents a local or anonymous
1335 * class within a constructor, returns a {@link
1336 * java.lang.reflect.Constructor Constructor} object representing
1337 * the immediately enclosing constructor of the underlying
1338 * class. Returns {@code null} otherwise. In particular, this
1339 * method returns {@code null} if the underlying class is a local
1340 * or anonymous class immediately enclosed by a type declaration,
1341 * instance initializer or static initializer.
1342 *
1343 * @return the immediately enclosing constructor of the underlying class, if
1344 * that class is a local or anonymous class; otherwise {@code null}.
1345 * @throws SecurityException
1346 * If a security manager, <i>s</i>, is present and any of the
1347 * following conditions is met:
1348 *
1349 * <ul>
1350 *
1351 * <li> the caller's class loader is not the same as the
1352 * class loader of the enclosing class and invocation of
1353 * {@link SecurityManager#checkPermission
1354 * s.checkPermission} method with
1355 * {@code RuntimePermission("accessDeclaredMembers")}
1356 * denies access to the constructors within the enclosing class
1357 *
1358 * <li> the caller's class loader is not the same as or an
1359 * ancestor of the class loader for the enclosing class and
1360 * invocation of {@link SecurityManager#checkPackageAccess
1361 * s.checkPackageAccess()} denies access to the package
1362 * of the enclosing class
1363 *
1364 * </ul>
1365 * @since 1.5
1366 */
1367 @CallerSensitive
1368 public Constructor<?> getEnclosingConstructor() throws SecurityException {
1369 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1370
1371 if (enclosingInfo == null)
1372 return null;
1373 else {
1374 if (!enclosingInfo.isConstructor())
1375 return null;
1376
1377 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1378 getFactory());
1379 Type [] parameterTypes = typeInfo.getParameterTypes();
1380 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1381
1382 // Convert Types to Classes; returned types *should*
1383 // be class objects since the methodDescriptor's used
1384 // don't have generics information
1385 for(int i = 0; i < parameterClasses.length; i++)
1386 parameterClasses[i] = toClass(parameterTypes[i]);
1387
1388 // Perform access check
1389 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1390 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1391 Reflection.getCallerClass(), true);
1392 // Client is ok to access declared methods but j.l.Class might not be.
1393 Constructor<?>[] candidates = AccessController.doPrivileged(
1394 new PrivilegedAction<>() {
1395 @Override
1396 public Constructor<?>[] run() {
1397 return enclosingCandidate.getDeclaredConstructors();
1398 }
1399 });
1400 /*
1401 * Loop over all declared constructors; match number
1402 * of and type of parameters.
1403 */
1404 for(Constructor<?> c: candidates) {
1405 Class<?>[] candidateParamClasses = c.getParameterTypes();
1406 if (candidateParamClasses.length == parameterClasses.length) {
1407 boolean matches = true;
1408 for(int i = 0; i < candidateParamClasses.length; i++) {
1409 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1410 matches = false;
1411 break;
1412 }
1413 }
1414
1415 if (matches)
1416 return c;
1417 }
1418 }
1419
1420 throw new InternalError("Enclosing constructor not found");
1421 }
1422 }
1423
1424
1425 /**
1426 * If the class or interface represented by this {@code Class} object
1427 * is a member of another class, returns the {@code Class} object
1428 * representing the class in which it was declared. This method returns
1429 * null if this class or interface is not a member of any other class. If
1430 * this {@code Class} object represents an array class, a primitive
1431 * type, or void,then this method returns null.
1432 *
1433 * @return the declaring class for this class
1434 * @throws SecurityException
1435 * If a security manager, <i>s</i>, is present and the caller's
1436 * class loader is not the same as or an ancestor of the class
1437 * loader for the declaring class and invocation of {@link
1438 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1439 * denies access to the package of the declaring class
1440 * @since 1.1
1441 */
1442 @CallerSensitive
1443 public Class<?> getDeclaringClass() throws SecurityException {
1444 final Class<?> candidate = getDeclaringClass0();
1445
1446 if (candidate != null)
1447 candidate.checkPackageAccess(
1448 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1449 return candidate;
1450 }
1451
1452 private native Class<?> getDeclaringClass0();
1453
1454
1455 /**
1456 * Returns the immediately enclosing class of the underlying
1457 * class. If the underlying class is a top level class this
1458 * method returns {@code null}.
1459 * @return the immediately enclosing class of the underlying class
1460 * @exception SecurityException
1461 * If a security manager, <i>s</i>, is present and the caller's
1462 * class loader is not the same as or an ancestor of the class
1463 * loader for the enclosing class and invocation of {@link
1464 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1465 * denies access to the package of the enclosing class
1466 * @since 1.5
1467 */
1468 @CallerSensitive
1469 public Class<?> getEnclosingClass() throws SecurityException {
1470 // There are five kinds of classes (or interfaces):
1471 // a) Top level classes
1472 // b) Nested classes (static member classes)
1473 // c) Inner classes (non-static member classes)
1474 // d) Local classes (named classes declared within a method)
1475 // e) Anonymous classes
1476
1477
1478 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1479 // attribute if and only if it is a local class or an
1480 // anonymous class.
1481 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1482 Class<?> enclosingCandidate;
1483
1484 if (enclosingInfo == null) {
1485 // This is a top level or a nested class or an inner class (a, b, or c)
1486 enclosingCandidate = getDeclaringClass();
1487 } else {
1488 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1489 // This is a local class or an anonymous class (d or e)
1490 if (enclosingClass == this || enclosingClass == null)
1491 throw new InternalError("Malformed enclosing method information");
1492 else
1493 enclosingCandidate = enclosingClass;
1494 }
1495
1496 if (enclosingCandidate != null)
1497 enclosingCandidate.checkPackageAccess(
1498 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1499 return enclosingCandidate;
1500 }
1501
1502 /**
1503 * Returns the simple name of the underlying class as given in the
1504 * source code. Returns an empty string if the underlying class is
1505 * anonymous.
1506 *
1507 * <p>The simple name of an array is the simple name of the
1508 * component type with "[]" appended. In particular the simple
1509 * name of an array whose component type is anonymous is "[]".
1510 *
1511 * @return the simple name of the underlying class
1512 * @since 1.5
1513 */
1514 public String getSimpleName() {
1515 if (isArray())
1516 return getComponentType().getSimpleName()+"[]";
1517
1518 String simpleName = getSimpleBinaryName();
1519 if (simpleName == null) { // top level class
1520 simpleName = getName();
1521 return simpleName.substring(simpleName.lastIndexOf('.')+1); // strip the package name
1522 }
1523 return simpleName;
1524 }
1525
1526 /**
1527 * Return an informative string for the name of this type.
1528 *
1529 * @return an informative string for the name of this type
1530 * @since 1.8
1531 */
1532 public String getTypeName() {
1533 if (isArray()) {
1534 try {
1535 Class<?> cl = this;
1536 int dimensions = 0;
1537 while (cl.isArray()) {
1538 dimensions++;
1539 cl = cl.getComponentType();
1540 }
1541 StringBuilder sb = new StringBuilder();
1542 sb.append(cl.getName());
1543 for (int i = 0; i < dimensions; i++) {
1544 sb.append("[]");
1545 }
1546 return sb.toString();
1547 } catch (Throwable e) { /*FALLTHRU*/ }
1548 }
1549 return getName();
1550 }
1551
1552 /**
1553 * Character.isDigit answers {@code true} to some non-ascii
1554 * digits. This one does not.
1555 */
1556 private static boolean isAsciiDigit(char c) {
1557 return '0' <= c && c <= '9';
1558 }
1559
1560 /**
1561 * Returns the canonical name of the underlying class as
1562 * defined by the Java Language Specification. Returns null if
1563 * the underlying class does not have a canonical name (i.e., if
1564 * it is a local or anonymous class or an array whose component
1565 * type does not have a canonical name).
1566 * @return the canonical name of the underlying class if it exists, and
1567 * {@code null} otherwise.
1568 * @since 1.5
1569 */
1570 public String getCanonicalName() {
1571 if (isArray()) {
1572 String canonicalName = getComponentType().getCanonicalName();
1573 if (canonicalName != null)
1574 return canonicalName + "[]";
1575 else
1576 return null;
1577 }
1578 if (isLocalOrAnonymousClass())
1579 return null;
1580 Class<?> enclosingClass = getEnclosingClass();
1581 if (enclosingClass == null) { // top level class
1582 return getName();
1583 } else {
1584 String enclosingName = enclosingClass.getCanonicalName();
1585 if (enclosingName == null)
1586 return null;
1587 return enclosingName + "." + getSimpleName();
1588 }
1589 }
1590
1591 /**
1592 * Returns {@code true} if and only if the underlying class
1593 * is an anonymous class.
1594 *
1595 * @return {@code true} if and only if this class is an anonymous class.
1596 * @since 1.5
1597 */
1598 public boolean isAnonymousClass() {
1599 return "".equals(getSimpleName());
1600 }
1601
1602 /**
1603 * Returns {@code true} if and only if the underlying class
1604 * is a local class.
1605 *
1606 * @return {@code true} if and only if this class is a local class.
1607 * @since 1.5
1608 */
1609 public boolean isLocalClass() {
1610 return isLocalOrAnonymousClass() && !isAnonymousClass();
1611 }
1612
1613 /**
1614 * Returns {@code true} if and only if the underlying class
1615 * is a member class.
1616 *
1617 * @return {@code true} if and only if this class is a member class.
1618 * @since 1.5
1619 */
1620 public boolean isMemberClass() {
1621 return getSimpleBinaryName() != null && !isLocalOrAnonymousClass();
1622 }
1623
1624 /**
1625 * Returns the "simple binary name" of the underlying class, i.e.,
1626 * the binary name without the leading enclosing class name.
1627 * Returns {@code null} if the underlying class is a top level
1628 * class.
1629 */
1630 private String getSimpleBinaryName() {
1631 Class<?> enclosingClass = getEnclosingClass();
1632 if (enclosingClass == null) // top level class
1633 return null;
1634 String name = getSimpleBinaryName0();
1635 if (name == null) // anonymous class
1636 return "";
1637 return name;
1638 }
1639
1640 private native String getSimpleBinaryName0();
1641
1642 /**
1643 * Returns {@code true} if this is a local class or an anonymous
1644 * class. Returns {@code false} otherwise.
1645 */
1646 private boolean isLocalOrAnonymousClass() {
1647 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1648 // attribute if and only if it is a local class or an
1649 // anonymous class.
1650 return getEnclosingMethodInfo() != null;
1651 }
1652
1653 /**
1654 * Returns an array containing {@code Class} objects representing all
1655 * the public classes and interfaces that are members of the class
1656 * represented by this {@code Class} object. This includes public
1657 * class and interface members inherited from superclasses and public class
1658 * and interface members declared by the class. This method returns an
1659 * array of length 0 if this {@code Class} object has no public member
1660 * classes or interfaces. This method also returns an array of length 0 if
1661 * this {@code Class} object represents a primitive type, an array
1662 * class, or void.
1663 *
1664 * @return the array of {@code Class} objects representing the public
1665 * members of this class
1666 * @throws SecurityException
1667 * If a security manager, <i>s</i>, is present and
1668 * the caller's class loader is not the same as or an
1669 * ancestor of the class loader for the current class and
1670 * invocation of {@link SecurityManager#checkPackageAccess
1671 * s.checkPackageAccess()} denies access to the package
1672 * of this class.
1673 *
1674 * @since 1.1
1675 */
1676 @CallerSensitive
1677 public Class<?>[] getClasses() {
1678 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
1679
1680 // Privileged so this implementation can look at DECLARED classes,
1681 // something the caller might not have privilege to do. The code here
1682 // is allowed to look at DECLARED classes because (1) it does not hand
1683 // out anything other than public members and (2) public member access
1684 // has already been ok'd by the SecurityManager.
1685
1686 return java.security.AccessController.doPrivileged(
1687 new java.security.PrivilegedAction<>() {
1688 public Class<?>[] run() {
1689 List<Class<?>> list = new ArrayList<>();
1690 Class<?> currentClass = Class.this;
1691 while (currentClass != null) {
1692 for (Class<?> m : currentClass.getDeclaredClasses()) {
1693 if (Modifier.isPublic(m.getModifiers())) {
1694 list.add(m);
1695 }
1696 }
1697 currentClass = currentClass.getSuperclass();
1698 }
1699 return list.toArray(new Class<?>[0]);
1700 }
1701 });
1702 }
1703
1704
1705 /**
1706 * Returns an array containing {@code Field} objects reflecting all
1707 * the accessible public fields of the class or interface represented by
1708 * this {@code Class} object.
1709 *
1710 * <p> If this {@code Class} object represents a class or interface with
1711 * no accessible public fields, then this method returns an array of length
1712 * 0.
1713 *
1714 * <p> If this {@code Class} object represents a class, then this method
1715 * returns the public fields of the class and of all its superclasses and
1716 * superinterfaces.
1717 *
1718 * <p> If this {@code Class} object represents an interface, then this
1719 * method returns the fields of the interface and of all its
1720 * superinterfaces.
1721 *
1722 * <p> If this {@code Class} object represents an array type, a primitive
1723 * type, or void, then this method returns an array of length 0.
1724 *
1725 * <p> The elements in the returned array are not sorted and are not in any
1726 * particular order.
1727 *
1728 * @return the array of {@code Field} objects representing the
1729 * public fields
1730 * @throws SecurityException
1731 * If a security manager, <i>s</i>, is present and
1732 * the caller's class loader is not the same as or an
1733 * ancestor of the class loader for the current class and
1734 * invocation of {@link SecurityManager#checkPackageAccess
1735 * s.checkPackageAccess()} denies access to the package
1736 * of this class.
1737 *
1738 * @since 1.1
1739 * @jls 8.2 Class Members
1740 * @jls 8.3 Field Declarations
1741 */
1742 @CallerSensitive
1743 public Field[] getFields() throws SecurityException {
1744 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1745 return copyFields(privateGetPublicFields(null));
1746 }
1747
1748
1749 /**
1750 * Returns an array containing {@code Method} objects reflecting all the
1751 * public methods of the class or interface represented by this {@code
1752 * Class} object, including those declared by the class or interface and
1753 * those inherited from superclasses and superinterfaces.
1754 *
1755 * <p> If this {@code Class} object represents a type that has multiple
1756 * public methods with the same name and parameter types, but different
1757 * return types, then the returned array has a {@code Method} object for
1758 * each such method.
1759 *
1760 * <p> If this {@code Class} object represents a type with a class
1761 * initialization method {@code <clinit>}, then the returned array does
1762 * <em>not</em> have a corresponding {@code Method} object.
1763 *
1764 * <p> If this {@code Class} object represents an array type, then the
1765 * returned array has a {@code Method} object for each of the public
1766 * methods inherited by the array type from {@code Object}. It does not
1767 * contain a {@code Method} object for {@code clone()}.
1768 *
1769 * <p> If this {@code Class} object represents an interface then the
1770 * returned array does not contain any implicitly declared methods from
1771 * {@code Object}. Therefore, if no methods are explicitly declared in
1772 * this interface or any of its superinterfaces then the returned array
1773 * has length 0. (Note that a {@code Class} object which represents a class
1774 * always has public methods, inherited from {@code Object}.)
1775 *
1776 * <p> If this {@code Class} object represents a primitive type or void,
1777 * then the returned array has length 0.
1778 *
1779 * <p> Static methods declared in superinterfaces of the class or interface
1780 * represented by this {@code Class} object are not considered members of
1781 * the class or interface.
1782 *
1783 * <p> The elements in the returned array are not sorted and are not in any
1784 * particular order.
1785 *
1786 * @return the array of {@code Method} objects representing the
1787 * public methods of this class
1788 * @throws SecurityException
1789 * If a security manager, <i>s</i>, is present and
1790 * the caller's class loader is not the same as or an
1791 * ancestor of the class loader for the current class and
1792 * invocation of {@link SecurityManager#checkPackageAccess
1793 * s.checkPackageAccess()} denies access to the package
1794 * of this class.
1795 *
1796 * @jls 8.2 Class Members
1797 * @jls 8.4 Method Declarations
1798 * @since 1.1
1799 */
1800 @CallerSensitive
1801 public Method[] getMethods() throws SecurityException {
1802 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1803 return copyMethods(privateGetPublicMethods());
1804 }
1805
1806
1807 /**
1808 * Returns an array containing {@code Constructor} objects reflecting
1809 * all the public constructors of the class represented by this
1810 * {@code Class} object. An array of length 0 is returned if the
1811 * class has no public constructors, or if the class is an array class, or
1812 * if the class reflects a primitive type or void.
1813 *
1814 * Note that while this method returns an array of {@code
1815 * Constructor<T>} objects (that is an array of constructors from
1816 * this class), the return type of this method is {@code
1817 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1818 * might be expected. This less informative return type is
1819 * necessary since after being returned from this method, the
1820 * array could be modified to hold {@code Constructor} objects for
1821 * different classes, which would violate the type guarantees of
1822 * {@code Constructor<T>[]}.
1823 *
1824 * @return the array of {@code Constructor} objects representing the
1825 * public constructors of this class
1826 * @throws SecurityException
1827 * If a security manager, <i>s</i>, is present and
1828 * the caller's class loader is not the same as or an
1829 * ancestor of the class loader for the current class and
1830 * invocation of {@link SecurityManager#checkPackageAccess
1831 * s.checkPackageAccess()} denies access to the package
1832 * of this class.
1833 *
1834 * @since 1.1
1835 */
1836 @CallerSensitive
1837 public Constructor<?>[] getConstructors() throws SecurityException {
1838 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1839 return copyConstructors(privateGetDeclaredConstructors(true));
1840 }
1841
1842
1843 /**
1844 * Returns a {@code Field} object that reflects the specified public member
1845 * field of the class or interface represented by this {@code Class}
1846 * object. The {@code name} parameter is a {@code String} specifying the
1847 * simple name of the desired field.
1848 *
1849 * <p> The field to be reflected is determined by the algorithm that
1850 * follows. Let C be the class or interface represented by this object:
1851 *
1852 * <OL>
1853 * <LI> If C declares a public field with the name specified, that is the
1854 * field to be reflected.</LI>
1855 * <LI> If no field was found in step 1 above, this algorithm is applied
1856 * recursively to each direct superinterface of C. The direct
1857 * superinterfaces are searched in the order they were declared.</LI>
1858 * <LI> If no field was found in steps 1 and 2 above, and C has a
1859 * superclass S, then this algorithm is invoked recursively upon S.
1860 * If C has no superclass, then a {@code NoSuchFieldException}
1861 * is thrown.</LI>
1862 * </OL>
1863 *
1864 * <p> If this {@code Class} object represents an array type, then this
1865 * method does not find the {@code length} field of the array type.
1866 *
1867 * @param name the field name
1868 * @return the {@code Field} object of this class specified by
1869 * {@code name}
1870 * @throws NoSuchFieldException if a field with the specified name is
1871 * not found.
1872 * @throws NullPointerException if {@code name} is {@code null}
1873 * @throws SecurityException
1874 * If a security manager, <i>s</i>, is present and
1875 * the caller's class loader is not the same as or an
1876 * ancestor of the class loader for the current class and
1877 * invocation of {@link SecurityManager#checkPackageAccess
1878 * s.checkPackageAccess()} denies access to the package
1879 * of this class.
1880 *
1881 * @since 1.1
1882 * @jls 8.2 Class Members
1883 * @jls 8.3 Field Declarations
1884 */
1885 @CallerSensitive
1886 public Field getField(String name)
1887 throws NoSuchFieldException, SecurityException {
1888 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1889 Field field = getField0(name);
1890 if (field == null) {
1891 throw new NoSuchFieldException(name);
1892 }
1893 return field;
1894 }
1895
1896
1897 /**
1898 * Returns a {@code Method} object that reflects the specified public
1899 * member method of the class or interface represented by this
1900 * {@code Class} object. The {@code name} parameter is a
1901 * {@code String} specifying the simple name of the desired method. The
1902 * {@code parameterTypes} parameter is an array of {@code Class}
1903 * objects that identify the method's formal parameter types, in declared
1904 * order. If {@code parameterTypes} is {@code null}, it is
1905 * treated as if it were an empty array.
1906 *
1907 * <p> If the {@code name} is "{@code <init>}" or "{@code <clinit>}" a
1908 * {@code NoSuchMethodException} is raised. Otherwise, the method to
1909 * be reflected is determined by the algorithm that follows. Let C be the
1910 * class or interface represented by this object:
1911 * <OL>
1912 * <LI> C is searched for a <I>matching method</I>, as defined below. If a
1913 * matching method is found, it is reflected.</LI>
1914 * <LI> If no matching method is found by step 1 then:
1915 * <OL TYPE="a">
1916 * <LI> If C is a class other than {@code Object}, then this algorithm is
1917 * invoked recursively on the superclass of C.</LI>
1918 * <LI> If C is the class {@code Object}, or if C is an interface, then
1919 * the superinterfaces of C (if any) are searched for a matching
1920 * method. If any such method is found, it is reflected.</LI>
1921 * </OL></LI>
1922 * </OL>
1923 *
1924 * <p> To find a matching method in a class or interface C: If C
1925 * declares exactly one public method with the specified name and exactly
1926 * the same formal parameter types, that is the method reflected. If more
1927 * than one such method is found in C, and one of these methods has a
1928 * return type that is more specific than any of the others, that method is
1929 * reflected; otherwise one of the methods is chosen arbitrarily.
1930 *
1931 * <p>Note that there may be more than one matching method in a
1932 * class because while the Java language forbids a class to
1933 * declare multiple methods with the same signature but different
1934 * return types, the Java virtual machine does not. This
1935 * increased flexibility in the virtual machine can be used to
1936 * implement various language features. For example, covariant
1937 * returns can be implemented with {@linkplain
1938 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1939 * method and the method being overridden would have the same
1940 * signature but different return types.
1941 *
1942 * <p> If this {@code Class} object represents an array type, then this
1943 * method does not find the {@code clone()} method.
1944 *
1945 * <p> Static methods declared in superinterfaces of the class or interface
1946 * represented by this {@code Class} object are not considered members of
1947 * the class or interface.
1948 *
1949 * @param name the name of the method
1950 * @param parameterTypes the list of parameters
1951 * @return the {@code Method} object that matches the specified
1952 * {@code name} and {@code parameterTypes}
1953 * @throws NoSuchMethodException if a matching method is not found
1954 * or if the name is "<init>"or "<clinit>".
1955 * @throws NullPointerException if {@code name} is {@code null}
1956 * @throws SecurityException
1957 * If a security manager, <i>s</i>, is present and
1958 * the caller's class loader is not the same as or an
1959 * ancestor of the class loader for the current class and
1960 * invocation of {@link SecurityManager#checkPackageAccess
1961 * s.checkPackageAccess()} denies access to the package
1962 * of this class.
1963 *
1964 * @jls 8.2 Class Members
1965 * @jls 8.4 Method Declarations
1966 * @since 1.1
1967 */
1968 @CallerSensitive
1969 public Method getMethod(String name, Class<?>... parameterTypes)
1970 throws NoSuchMethodException, SecurityException {
1971 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1972 Method method = getMethod0(name, parameterTypes, true);
1973 if (method == null) {
1974 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1975 }
1976 return method;
1977 }
1978
1979
1980 /**
1981 * Returns a {@code Constructor} object that reflects the specified
1982 * public constructor of the class represented by this {@code Class}
1983 * object. The {@code parameterTypes} parameter is an array of
1984 * {@code Class} objects that identify the constructor's formal
1985 * parameter types, in declared order.
1986 *
1987 * If this {@code Class} object represents an inner class
1988 * declared in a non-static context, the formal parameter types
1989 * include the explicit enclosing instance as the first parameter.
1990 *
1991 * <p> The constructor to reflect is the public constructor of the class
1992 * represented by this {@code Class} object whose formal parameter
1993 * types match those specified by {@code parameterTypes}.
1994 *
1995 * @param parameterTypes the parameter array
1996 * @return the {@code Constructor} object of the public constructor that
1997 * matches the specified {@code parameterTypes}
1998 * @throws NoSuchMethodException if a matching method is not found.
1999 * @throws SecurityException
2000 * If a security manager, <i>s</i>, is present and
2001 * the caller's class loader is not the same as or an
2002 * ancestor of the class loader for the current class and
2003 * invocation of {@link SecurityManager#checkPackageAccess
2004 * s.checkPackageAccess()} denies access to the package
2005 * of this class.
2006 *
2007 * @since 1.1
2008 */
2009 @CallerSensitive
2010 public Constructor<T> getConstructor(Class<?>... parameterTypes)
2011 throws NoSuchMethodException, SecurityException {
2012 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
2013 return getConstructor0(parameterTypes, Member.PUBLIC);
2014 }
2015
2016
2017 /**
2018 * Returns an array of {@code Class} objects reflecting all the
2019 * classes and interfaces declared as members of the class represented by
2020 * this {@code Class} object. This includes public, protected, default
2021 * (package) access, and private classes and interfaces declared by the
2022 * class, but excludes inherited classes and interfaces. This method
2023 * returns an array of length 0 if the class declares no classes or
2024 * interfaces as members, or if this {@code Class} object represents a
2025 * primitive type, an array class, or void.
2026 *
2027 * @return the array of {@code Class} objects representing all the
2028 * declared members of this class
2029 * @throws SecurityException
2030 * If a security manager, <i>s</i>, is present and any of the
2031 * following conditions is met:
2032 *
2033 * <ul>
2034 *
2035 * <li> the caller's class loader is not the same as the
2036 * class loader of this class and invocation of
2037 * {@link SecurityManager#checkPermission
2038 * s.checkPermission} method with
2039 * {@code RuntimePermission("accessDeclaredMembers")}
2040 * denies access to the declared classes within this class
2041 *
2042 * <li> the caller's class loader is not the same as or an
2043 * ancestor of the class loader for the current class and
2044 * invocation of {@link SecurityManager#checkPackageAccess
2045 * s.checkPackageAccess()} denies access to the package
2046 * of this class
2047 *
2048 * </ul>
2049 *
2050 * @since 1.1
2051 */
2052 @CallerSensitive
2053 public Class<?>[] getDeclaredClasses() throws SecurityException {
2054 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), false);
2055 return getDeclaredClasses0();
2056 }
2057
2058
2059 /**
2060 * Returns an array of {@code Field} objects reflecting all the fields
2061 * declared by the class or interface represented by this
2062 * {@code Class} object. This includes public, protected, default
2063 * (package) access, and private fields, but excludes inherited fields.
2064 *
2065 * <p> If this {@code Class} object represents a class or interface with no
2066 * declared fields, then this method returns an array of length 0.
2067 *
2068 * <p> If this {@code Class} object represents an array type, a primitive
2069 * type, or void, then this method returns an array of length 0.
2070 *
2071 * <p> The elements in the returned array are not sorted and are not in any
2072 * particular order.
2073 *
2074 * @return the array of {@code Field} objects representing all the
2075 * declared fields of this class
2076 * @throws SecurityException
2077 * If a security manager, <i>s</i>, is present and any of the
2078 * following conditions is met:
2079 *
2080 * <ul>
2081 *
2082 * <li> the caller's class loader is not the same as the
2083 * class loader of this class and invocation of
2084 * {@link SecurityManager#checkPermission
2085 * s.checkPermission} method with
2086 * {@code RuntimePermission("accessDeclaredMembers")}
2087 * denies access to the declared fields within this class
2088 *
2089 * <li> the caller's class loader is not the same as or an
2090 * ancestor of the class loader for the current class and
2091 * invocation of {@link SecurityManager#checkPackageAccess
2092 * s.checkPackageAccess()} denies access to the package
2093 * of this class
2094 *
2095 * </ul>
2096 *
2097 * @since 1.1
2098 * @jls 8.2 Class Members
2099 * @jls 8.3 Field Declarations
2100 */
2101 @CallerSensitive
2102 public Field[] getDeclaredFields() throws SecurityException {
2103 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2104 return copyFields(privateGetDeclaredFields(false));
2105 }
2106
2107
2108 /**
2109 *
2110 * Returns an array containing {@code Method} objects reflecting all the
2111 * declared methods of the class or interface represented by this {@code
2112 * Class} object, including public, protected, default (package)
2113 * access, and private methods, but excluding inherited methods.
2114 *
2115 * <p> If this {@code Class} object represents a type that has multiple
2116 * declared methods with the same name and parameter types, but different
2117 * return types, then the returned array has a {@code Method} object for
2118 * each such method.
2119 *
2120 * <p> If this {@code Class} object represents a type that has a class
2121 * initialization method {@code <clinit>}, then the returned array does
2122 * <em>not</em> have a corresponding {@code Method} object.
2123 *
2124 * <p> If this {@code Class} object represents a class or interface with no
2125 * declared methods, then the returned array has length 0.
2126 *
2127 * <p> If this {@code Class} object represents an array type, a primitive
2128 * type, or void, then the returned array has length 0.
2129 *
2130 * <p> The elements in the returned array are not sorted and are not in any
2131 * particular order.
2132 *
2133 * @return the array of {@code Method} objects representing all the
2134 * declared methods of this class
2135 * @throws SecurityException
2136 * If a security manager, <i>s</i>, is present and any of the
2137 * following conditions is met:
2138 *
2139 * <ul>
2140 *
2141 * <li> the caller's class loader is not the same as the
2142 * class loader of this class and invocation of
2143 * {@link SecurityManager#checkPermission
2144 * s.checkPermission} method with
2145 * {@code RuntimePermission("accessDeclaredMembers")}
2146 * denies access to the declared methods within this class
2147 *
2148 * <li> the caller's class loader is not the same as or an
2149 * ancestor of the class loader for the current class and
2150 * invocation of {@link SecurityManager#checkPackageAccess
2151 * s.checkPackageAccess()} denies access to the package
2152 * of this class
2153 *
2154 * </ul>
2155 *
2156 * @jls 8.2 Class Members
2157 * @jls 8.4 Method Declarations
2158 * @since 1.1
2159 */
2160 @CallerSensitive
2161 public Method[] getDeclaredMethods() throws SecurityException {
2162 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2163 return copyMethods(privateGetDeclaredMethods(false));
2164 }
2165
2166
2167 /**
2168 * Returns an array of {@code Constructor} objects reflecting all the
2169 * constructors declared by the class represented by this
2170 * {@code Class} object. These are public, protected, default
2171 * (package) access, and private constructors. The elements in the array
2172 * returned are not sorted and are not in any particular order. If the
2173 * class has a default constructor, it is included in the returned array.
2174 * This method returns an array of length 0 if this {@code Class}
2175 * object represents an interface, a primitive type, an array class, or
2176 * void.
2177 *
2178 * <p> See <em>The Java Language Specification</em>, section 8.2.
2179 *
2180 * @return the array of {@code Constructor} objects representing all the
2181 * declared constructors of this class
2182 * @throws SecurityException
2183 * If a security manager, <i>s</i>, is present and any of the
2184 * following conditions is met:
2185 *
2186 * <ul>
2187 *
2188 * <li> the caller's class loader is not the same as the
2189 * class loader of this class and invocation of
2190 * {@link SecurityManager#checkPermission
2191 * s.checkPermission} method with
2192 * {@code RuntimePermission("accessDeclaredMembers")}
2193 * denies access to the declared constructors within this class
2194 *
2195 * <li> the caller's class loader is not the same as or an
2196 * ancestor of the class loader for the current class and
2197 * invocation of {@link SecurityManager#checkPackageAccess
2198 * s.checkPackageAccess()} denies access to the package
2199 * of this class
2200 *
2201 * </ul>
2202 *
2203 * @since 1.1
2204 */
2205 @CallerSensitive
2206 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
2207 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2208 return copyConstructors(privateGetDeclaredConstructors(false));
2209 }
2210
2211
2212 /**
2213 * Returns a {@code Field} object that reflects the specified declared
2214 * field of the class or interface represented by this {@code Class}
2215 * object. The {@code name} parameter is a {@code String} that specifies
2216 * the simple name of the desired field.
2217 *
2218 * <p> If this {@code Class} object represents an array type, then this
2219 * method does not find the {@code length} field of the array type.
2220 *
2221 * @param name the name of the field
2222 * @return the {@code Field} object for the specified field in this
2223 * class
2224 * @throws NoSuchFieldException if a field with the specified name is
2225 * not found.
2226 * @throws NullPointerException if {@code name} is {@code null}
2227 * @throws SecurityException
2228 * If a security manager, <i>s</i>, is present and any of the
2229 * following conditions is met:
2230 *
2231 * <ul>
2232 *
2233 * <li> the caller's class loader is not the same as the
2234 * class loader of this class and invocation of
2235 * {@link SecurityManager#checkPermission
2236 * s.checkPermission} method with
2237 * {@code RuntimePermission("accessDeclaredMembers")}
2238 * denies access to the declared field
2239 *
2240 * <li> the caller's class loader is not the same as or an
2241 * ancestor of the class loader for the current class and
2242 * invocation of {@link SecurityManager#checkPackageAccess
2243 * s.checkPackageAccess()} denies access to the package
2244 * of this class
2245 *
2246 * </ul>
2247 *
2248 * @since 1.1
2249 * @jls 8.2 Class Members
2250 * @jls 8.3 Field Declarations
2251 */
2252 @CallerSensitive
2253 public Field getDeclaredField(String name)
2254 throws NoSuchFieldException, SecurityException {
2255 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2256 Field field = searchFields(privateGetDeclaredFields(false), name);
2257 if (field == null) {
2258 throw new NoSuchFieldException(name);
2259 }
2260 return field;
2261 }
2262
2263
2264 /**
2265 * Returns a {@code Method} object that reflects the specified
2266 * declared method of the class or interface represented by this
2267 * {@code Class} object. The {@code name} parameter is a
2268 * {@code String} that specifies the simple name of the desired
2269 * method, and the {@code parameterTypes} parameter is an array of
2270 * {@code Class} objects that identify the method's formal parameter
2271 * types, in declared order. If more than one method with the same
2272 * parameter types is declared in a class, and one of these methods has a
2273 * return type that is more specific than any of the others, that method is
2274 * returned; otherwise one of the methods is chosen arbitrarily. If the
2275 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
2276 * is raised.
2277 *
2278 * <p> If this {@code Class} object represents an array type, then this
2279 * method does not find the {@code clone()} method.
2280 *
2281 * @param name the name of the method
2282 * @param parameterTypes the parameter array
2283 * @return the {@code Method} object for the method of this class
2284 * matching the specified name and parameters
2285 * @throws NoSuchMethodException if a matching method is not found.
2286 * @throws NullPointerException if {@code name} is {@code null}
2287 * @throws SecurityException
2288 * If a security manager, <i>s</i>, is present and any of the
2289 * following conditions is met:
2290 *
2291 * <ul>
2292 *
2293 * <li> the caller's class loader is not the same as the
2294 * class loader of this class and invocation of
2295 * {@link SecurityManager#checkPermission
2296 * s.checkPermission} method with
2297 * {@code RuntimePermission("accessDeclaredMembers")}
2298 * denies access to the declared method
2299 *
2300 * <li> the caller's class loader is not the same as or an
2301 * ancestor of the class loader for the current class and
2302 * invocation of {@link SecurityManager#checkPackageAccess
2303 * s.checkPackageAccess()} denies access to the package
2304 * of this class
2305 *
2306 * </ul>
2307 *
2308 * @jls 8.2 Class Members
2309 * @jls 8.4 Method Declarations
2310 * @since 1.1
2311 */
2312 @CallerSensitive
2313 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
2314 throws NoSuchMethodException, SecurityException {
2315 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2316 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
2317 if (method == null) {
2318 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
2319 }
2320 return method;
2321 }
2322
2323
2324 /**
2325 * Returns a {@code Constructor} object that reflects the specified
2326 * constructor of the class or interface represented by this
2327 * {@code Class} object. The {@code parameterTypes} parameter is
2328 * an array of {@code Class} objects that identify the constructor's
2329 * formal parameter types, in declared order.
2330 *
2331 * If this {@code Class} object represents an inner class
2332 * declared in a non-static context, the formal parameter types
2333 * include the explicit enclosing instance as the first parameter.
2334 *
2335 * @param parameterTypes the parameter array
2336 * @return The {@code Constructor} object for the constructor with the
2337 * specified parameter list
2338 * @throws NoSuchMethodException if a matching method is not found.
2339 * @throws SecurityException
2340 * If a security manager, <i>s</i>, is present and any of the
2341 * following conditions is met:
2342 *
2343 * <ul>
2344 *
2345 * <li> the caller's class loader is not the same as the
2346 * class loader of this class and invocation of
2347 * {@link SecurityManager#checkPermission
2348 * s.checkPermission} method with
2349 * {@code RuntimePermission("accessDeclaredMembers")}
2350 * denies access to the declared constructor
2351 *
2352 * <li> the caller's class loader is not the same as or an
2353 * ancestor of the class loader for the current class and
2354 * invocation of {@link SecurityManager#checkPackageAccess
2355 * s.checkPackageAccess()} denies access to the package
2356 * of this class
2357 *
2358 * </ul>
2359 *
2360 * @since 1.1
2361 */
2362 @CallerSensitive
2363 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
2364 throws NoSuchMethodException, SecurityException {
2365 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2366 return getConstructor0(parameterTypes, Member.DECLARED);
2367 }
2368
2369 /**
2370 * Finds a resource with a given name. If this class is in a named {@link
2371 * Module Module}, and the caller of this method is in the same module,
2372 * then this method will attempt to find the resource in that module.
2373 * Otherwise, the rules for searching resources
2374 * associated with a given class are implemented by the defining
2375 * {@linkplain ClassLoader class loader} of the class. This method
2376 * delegates to this object's class loader. If this object was loaded by
2377 * the bootstrap class loader, the method delegates to {@link
2378 * ClassLoader#getSystemResourceAsStream}.
2379 *
2380 * <p> Before finding a resource in the caller's module or delegation to a
2381 * class loader, an absolute resource name is constructed from the given
2382 * resource name using this algorithm:
2383 *
2384 * <ul>
2385 *
2386 * <li> If the {@code name} begins with a {@code '/'}
2387 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2388 * portion of the {@code name} following the {@code '/'}.
2389 *
2390 * <li> Otherwise, the absolute name is of the following form:
2391 *
2392 * <blockquote>
2393 * {@code modified_package_name/name}
2394 * </blockquote>
2395 *
2396 * <p> Where the {@code modified_package_name} is the package name of this
2397 * object with {@code '/'} substituted for {@code '.'}
2398 * (<tt>'\u002e'</tt>).
2399 *
2400 * </ul>
2401 *
2402 * @param name name of the desired resource
2403 * @return A {@link java.io.InputStream} object or {@code null} if
2404 * no resource with this name is found
2405 * @throws NullPointerException If {@code name} is {@code null}
2406 * @since 1.1
2407 */
2408 @CallerSensitive
2409 public InputStream getResourceAsStream(String name) {
2410 name = resolveName(name);
2411
2412 // if this Class and the caller are in the same named module
2413 // then attempt to get an input stream to the resource in the
2414 // module
2415 Module module = getModule();
2416 if (module.isNamed()) {
2417 Class<?> caller = Reflection.getCallerClass();
2418 if (caller != null && caller.getModule() == module) {
2419 ClassLoader cl = getClassLoader0();
2420 String mn = module.getName();
2421 try {
2422
2423 // special-case built-in class loaders to avoid the
2424 // need for a URL connection
2425 if (cl == null) {
2426 return BootLoader.findResourceAsStream(mn, name);
2427 } else if (cl instanceof BuiltinClassLoader) {
2428 return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name);
2429 } else {
2430 URL url = cl.findResource(mn, name);
2431 return (url != null) ? url.openStream() : null;
2432 }
2433
2434 } catch (IOException | SecurityException e) {
2435 return null;
2436 }
2437 }
2438 }
2439
2440 // this Class and caller not in the same named module
2441 ClassLoader cl = getClassLoader0();
2442 if (cl == null) {
2443 return ClassLoader.getSystemResourceAsStream(name);
2444 } else {
2445 return cl.getResourceAsStream(name);
2446 }
2447 }
2448
2449 /**
2450 * Finds a resource with a given name. If this class is in a named {@link
2451 * Module Module}, and the caller of this method is in the same module,
2452 * then this method will attempt to find the resource in that module.
2453 * Otherwise, the rules for searching resources
2454 * associated with a given class are implemented by the defining
2455 * {@linkplain ClassLoader class loader} of the class. This method
2456 * delegates to this object's class loader. If this object was loaded by
2457 * the bootstrap class loader, the method delegates to {@link
2458 * ClassLoader#getSystemResource}.
2459 *
2460 * <p> Before delegation, an absolute resource name is constructed from the
2461 * given resource name using this algorithm:
2462 *
2463 * <ul>
2464 *
2465 * <li> If the {@code name} begins with a {@code '/'}
2466 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2467 * portion of the {@code name} following the {@code '/'}.
2468 *
2469 * <li> Otherwise, the absolute name is of the following form:
2470 *
2471 * <blockquote>
2472 * {@code modified_package_name/name}
2473 * </blockquote>
2474 *
2475 * <p> Where the {@code modified_package_name} is the package name of this
2476 * object with {@code '/'} substituted for {@code '.'}
2477 * (<tt>'\u002e'</tt>).
2478 *
2479 * </ul>
2480 *
2481 * @param name name of the desired resource
2482 * @return A {@link java.net.URL} object; {@code null} if no
2483 * resource with this name is found or the resource cannot
2484 * be located by a URL.
2485 * @since 1.1
2486 */
2487 @CallerSensitive
2488 public URL getResource(String name) {
2489 name = resolveName(name);
2490
2491 // if this Class and the caller are in the same named module
2492 // then attempt to get URL to the resource in the module
2493 Module module = getModule();
2494 if (module.isNamed()) {
2495 Class<?> caller = Reflection.getCallerClass();
2496 if (caller != null && caller.getModule() == module) {
2497 String mn = getModule().getName();
2498 ClassLoader cl = getClassLoader0();
2499 try {
2500 if (cl == null) {
2501 return BootLoader.findResource(mn, name);
2502 } else {
2503 return cl.findResource(mn, name);
2504 }
2505 } catch (IOException ioe) {
2506 return null;
2507 }
2508 }
2509 }
2510
2511 ClassLoader cl = getClassLoader0();
2512 if (cl == null) {
2513 return ClassLoader.getSystemResource(name);
2514 } else {
2515 return cl.getResource(name);
2516 }
2517 }
2518
2519 /** protection domain returned when the internal domain is null */
2520 private static java.security.ProtectionDomain allPermDomain;
2521
2522
2523 /**
2524 * Returns the {@code ProtectionDomain} of this class. If there is a
2525 * security manager installed, this method first calls the security
2526 * manager's {@code checkPermission} method with a
2527 * {@code RuntimePermission("getProtectionDomain")} permission to
2528 * ensure it's ok to get the
2529 * {@code ProtectionDomain}.
2530 *
2531 * @return the ProtectionDomain of this class
2532 *
2533 * @throws SecurityException
2534 * if a security manager exists and its
2535 * {@code checkPermission} method doesn't allow
2536 * getting the ProtectionDomain.
2537 *
2538 * @see java.security.ProtectionDomain
2539 * @see SecurityManager#checkPermission
2540 * @see java.lang.RuntimePermission
2541 * @since 1.2
2542 */
2543 public java.security.ProtectionDomain getProtectionDomain() {
2544 SecurityManager sm = System.getSecurityManager();
2545 if (sm != null) {
2546 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2547 }
2548 java.security.ProtectionDomain pd = getProtectionDomain0();
2549 if (pd == null) {
2550 if (allPermDomain == null) {
2551 java.security.Permissions perms =
2552 new java.security.Permissions();
2553 perms.add(SecurityConstants.ALL_PERMISSION);
2554 allPermDomain =
2555 new java.security.ProtectionDomain(null, perms);
2556 }
2557 pd = allPermDomain;
2558 }
2559 return pd;
2560 }
2561
2562
2563 /**
2564 * Returns the ProtectionDomain of this class.
2565 */
2566 private native java.security.ProtectionDomain getProtectionDomain0();
2567
2568 /*
2569 * Return the Virtual Machine's Class object for the named
2570 * primitive type.
2571 */
2572 static native Class<?> getPrimitiveClass(String name);
2573
2574 /*
2575 * Check if client is allowed to access members. If access is denied,
2576 * throw a SecurityException.
2577 *
2578 * This method also enforces package access.
2579 *
2580 * <p> Default policy: allow all clients access with normal Java access
2581 * control.
2582 */
2583 private void checkMemberAccess(int which, Class<?> caller, boolean checkProxyInterfaces) {
2584 final SecurityManager s = System.getSecurityManager();
2585 if (s != null) {
2586 /* Default policy allows access to all {@link Member#PUBLIC} members,
2587 * as well as access to classes that have the same class loader as the caller.
2588 * In all other cases, it requires RuntimePermission("accessDeclaredMembers")
2589 * permission.
2590 */
2591 final ClassLoader ccl = ClassLoader.getClassLoader(caller);
2592 final ClassLoader cl = getClassLoader0();
2593 if (which != Member.PUBLIC) {
2594 if (ccl != cl) {
2595 s.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
2596 }
2597 }
2598 this.checkPackageAccess(ccl, checkProxyInterfaces);
2599 }
2600 }
2601
2602 /*
2603 * Checks if a client loaded in ClassLoader ccl is allowed to access this
2604 * class under the current package access policy. If access is denied,
2605 * throw a SecurityException.
2606 */
2607 private void checkPackageAccess(final ClassLoader ccl, boolean checkProxyInterfaces) {
2608 final SecurityManager s = System.getSecurityManager();
2609 if (s != null) {
2610 final ClassLoader cl = getClassLoader0();
2611
2612 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2613 String name = this.getName();
2614 int i = name.lastIndexOf('.');
2615 if (i != -1) {
2616 // skip the package access check on a proxy class in default proxy package
2617 String pkg = name.substring(0, i);
2618 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
2619 s.checkPackageAccess(pkg);
2620 }
2621 }
2622 }
2623 // check package access on the proxy interfaces
2624 if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
2625 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
2626 }
2627 }
2628 }
2629
2630 /**
2631 * Add a package name prefix if the name is not absolute Remove leading "/"
2632 * if name is absolute
2633 */
2634 private String resolveName(String name) {
2635 if (name == null) {
2636 return name;
2637 }
2638 if (!name.startsWith("/")) {
2639 Class<?> c = this;
2640 while (c.isArray()) {
2641 c = c.getComponentType();
2642 }
2643 String baseName = c.getName();
2644 int index = baseName.lastIndexOf('.');
2645 if (index != -1) {
2646 name = baseName.substring(0, index).replace('.', '/')
2647 +"/"+name;
2648 }
2649 } else {
2650 name = name.substring(1);
2651 }
2652 return name;
2653 }
2654
2655 /**
2656 * Atomic operations support.
2657 */
2658 private static class Atomic {
2659 // initialize Unsafe machinery here, since we need to call Class.class instance method
2660 // and have to avoid calling it in the static initializer of the Class class...
2661 private static final Unsafe unsafe = Unsafe.getUnsafe();
2662 // offset of Class.reflectionData instance field
2663 private static final long reflectionDataOffset;
2664 // offset of Class.annotationType instance field
2665 private static final long annotationTypeOffset;
2666 // offset of Class.annotationData instance field
2667 private static final long annotationDataOffset;
2668
2669 static {
2670 Field[] fields = Class.class.getDeclaredFields0(false); // bypass caches
2671 reflectionDataOffset = objectFieldOffset(fields, "reflectionData");
2672 annotationTypeOffset = objectFieldOffset(fields, "annotationType");
2673 annotationDataOffset = objectFieldOffset(fields, "annotationData");
2674 }
2675
2676 private static long objectFieldOffset(Field[] fields, String fieldName) {
2677 Field field = searchFields(fields, fieldName);
2678 if (field == null) {
2679 throw new Error("No " + fieldName + " field found in java.lang.Class");
2680 }
2681 return unsafe.objectFieldOffset(field);
2682 }
2683
2684 static <T> boolean casReflectionData(Class<?> clazz,
2685 SoftReference<ReflectionData<T>> oldData,
2686 SoftReference<ReflectionData<T>> newData) {
2687 return unsafe.compareAndSwapObject(clazz, reflectionDataOffset, oldData, newData);
2688 }
2689
2690 static <T> boolean casAnnotationType(Class<?> clazz,
2691 AnnotationType oldType,
2692 AnnotationType newType) {
2693 return unsafe.compareAndSwapObject(clazz, annotationTypeOffset, oldType, newType);
2694 }
2695
2696 static <T> boolean casAnnotationData(Class<?> clazz,
2697 AnnotationData oldData,
2698 AnnotationData newData) {
2699 return unsafe.compareAndSwapObject(clazz, annotationDataOffset, oldData, newData);
2700 }
2701 }
2702
2703 /**
2704 * Reflection support.
2705 */
2706
2707 // Caches for certain reflective results
2708 private static boolean useCaches = true;
2709
2710 // reflection data that might get invalidated when JVM TI RedefineClasses() is called
2711 private static class ReflectionData<T> {
2712 volatile Field[] declaredFields;
2713 volatile Field[] publicFields;
2714 volatile Method[] declaredMethods;
2715 volatile Method[] publicMethods;
2716 volatile Constructor<T>[] declaredConstructors;
2717 volatile Constructor<T>[] publicConstructors;
2718 // Intermediate results for getFields and getMethods
2719 volatile Field[] declaredPublicFields;
2720 volatile Method[] declaredPublicMethods;
2721 volatile Class<?>[] interfaces;
2722
2723 // Value of classRedefinedCount when we created this ReflectionData instance
2724 final int redefinedCount;
2725
2726 ReflectionData(int redefinedCount) {
2727 this.redefinedCount = redefinedCount;
2728 }
2729 }
2730
2731 private transient volatile SoftReference<ReflectionData<T>> reflectionData;
2732
2733 // Incremented by the VM on each call to JVM TI RedefineClasses()
2734 // that redefines this class or a superclass.
2735 private transient volatile int classRedefinedCount;
2736
2737 // Lazily create and cache ReflectionData
2738 private ReflectionData<T> reflectionData() {
2739 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
2740 int classRedefinedCount = this.classRedefinedCount;
2741 ReflectionData<T> rd;
2742 if (useCaches &&
2743 reflectionData != null &&
2744 (rd = reflectionData.get()) != null &&
2745 rd.redefinedCount == classRedefinedCount) {
2746 return rd;
2747 }
2748 // else no SoftReference or cleared SoftReference or stale ReflectionData
2749 // -> create and replace new instance
2750 return newReflectionData(reflectionData, classRedefinedCount);
2751 }
2752
2753 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
2754 int classRedefinedCount) {
2755 if (!useCaches) return null;
2756
2757 while (true) {
2758 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
2759 // try to CAS it...
2760 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
2761 return rd;
2762 }
2763 // else retry
2764 oldReflectionData = this.reflectionData;
2765 classRedefinedCount = this.classRedefinedCount;
2766 if (oldReflectionData != null &&
2767 (rd = oldReflectionData.get()) != null &&
2768 rd.redefinedCount == classRedefinedCount) {
2769 return rd;
2770 }
2771 }
2772 }
2773
2774 // Generic signature handling
2775 private native String getGenericSignature0();
2776
2777 // Generic info repository; lazily initialized
2778 private transient volatile ClassRepository genericInfo;
2779
2780 // accessor for factory
2781 private GenericsFactory getFactory() {
2782 // create scope and factory
2783 return CoreReflectionFactory.make(this, ClassScope.make(this));
2784 }
2785
2786 // accessor for generic info repository;
2787 // generic info is lazily initialized
2788 private ClassRepository getGenericInfo() {
2789 ClassRepository genericInfo = this.genericInfo;
2790 if (genericInfo == null) {
2791 String signature = getGenericSignature0();
2792 if (signature == null) {
2793 genericInfo = ClassRepository.NONE;
2794 } else {
2795 genericInfo = ClassRepository.make(signature, getFactory());
2796 }
2797 this.genericInfo = genericInfo;
2798 }
2799 return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
2800 }
2801
2802 // Annotations handling
2803 native byte[] getRawAnnotations();
2804 // Since 1.8
2805 native byte[] getRawTypeAnnotations();
2806 static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
2807 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
2808 }
2809
2810 native ConstantPool getConstantPool();
2811
2812 //
2813 //
2814 // java.lang.reflect.Field handling
2815 //
2816 //
2817
2818 // Returns an array of "root" fields. These Field objects must NOT
2819 // be propagated to the outside world, but must instead be copied
2820 // via ReflectionFactory.copyField.
2821 private Field[] privateGetDeclaredFields(boolean publicOnly) {
2822 checkInitted();
2823 Field[] res;
2824 ReflectionData<T> rd = reflectionData();
2825 if (rd != null) {
2826 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
2827 if (res != null) return res;
2828 }
2829 // No cached value available; request value from VM
2830 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
2831 if (rd != null) {
2832 if (publicOnly) {
2833 rd.declaredPublicFields = res;
2834 } else {
2835 rd.declaredFields = res;
2836 }
2837 }
2838 return res;
2839 }
2840
2841 // Returns an array of "root" fields. These Field objects must NOT
2842 // be propagated to the outside world, but must instead be copied
2843 // via ReflectionFactory.copyField.
2844 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) {
2845 checkInitted();
2846 Field[] res;
2847 ReflectionData<T> rd = reflectionData();
2848 if (rd != null) {
2849 res = rd.publicFields;
2850 if (res != null) return res;
2851 }
2852
2853 // No cached value available; compute value recursively.
2854 // Traverse in correct order for getField().
2855 List<Field> fields = new ArrayList<>();
2856 if (traversedInterfaces == null) {
2857 traversedInterfaces = new HashSet<>();
2858 }
2859
2860 // Local fields
2861 Field[] tmp = privateGetDeclaredFields(true);
2862 addAll(fields, tmp);
2863
2864 // Direct superinterfaces, recursively
2865 for (Class<?> c : getInterfaces()) {
2866 if (!traversedInterfaces.contains(c)) {
2867 traversedInterfaces.add(c);
2868 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2869 }
2870 }
2871
2872 // Direct superclass, recursively
2873 if (!isInterface()) {
2874 Class<?> c = getSuperclass();
2875 if (c != null) {
2876 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2877 }
2878 }
2879
2880 res = new Field[fields.size()];
2881 fields.toArray(res);
2882 if (rd != null) {
2883 rd.publicFields = res;
2884 }
2885 return res;
2886 }
2887
2888 private static void addAll(Collection<Field> c, Field[] o) {
2889 for (Field f : o) {
2890 c.add(f);
2891 }
2892 }
2893
2894
2895 //
2896 //
2897 // java.lang.reflect.Constructor handling
2898 //
2899 //
2900
2901 // Returns an array of "root" constructors. These Constructor
2902 // objects must NOT be propagated to the outside world, but must
2903 // instead be copied via ReflectionFactory.copyConstructor.
2904 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
2905 checkInitted();
2906 Constructor<T>[] res;
2907 ReflectionData<T> rd = reflectionData();
2908 if (rd != null) {
2909 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
2910 if (res != null) return res;
2911 }
2912 // No cached value available; request value from VM
2913 if (isInterface()) {
2914 @SuppressWarnings("unchecked")
2915 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
2916 res = temporaryRes;
2917 } else {
2918 res = getDeclaredConstructors0(publicOnly);
2919 }
2920 if (rd != null) {
2921 if (publicOnly) {
2922 rd.publicConstructors = res;
2923 } else {
2924 rd.declaredConstructors = res;
2925 }
2926 }
2927 return res;
2928 }
2929
2930 //
2931 //
2932 // java.lang.reflect.Method handling
2933 //
2934 //
2935
2936 // Returns an array of "root" methods. These Method objects must NOT
2937 // be propagated to the outside world, but must instead be copied
2938 // via ReflectionFactory.copyMethod.
2939 private Method[] privateGetDeclaredMethods(boolean publicOnly) {
2940 checkInitted();
2941 Method[] res;
2942 ReflectionData<T> rd = reflectionData();
2943 if (rd != null) {
2944 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
2945 if (res != null) return res;
2946 }
2947 // No cached value available; request value from VM
2948 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
2949 if (rd != null) {
2950 if (publicOnly) {
2951 rd.declaredPublicMethods = res;
2952 } else {
2953 rd.declaredMethods = res;
2954 }
2955 }
2956 return res;
2957 }
2958
2959 static class MethodArray {
2960 // Don't add or remove methods except by add() or remove() calls.
2961 private Method[] methods;
2962 private int length;
2963 private int defaults;
2964
2965 MethodArray() {
2966 this(20);
2967 }
2968
2969 MethodArray(int initialSize) {
2970 if (initialSize < 2)
2971 throw new IllegalArgumentException("Size should be 2 or more");
2972
2973 methods = new Method[initialSize];
2974 length = 0;
2975 defaults = 0;
2976 }
2977
2978 boolean hasDefaults() {
2979 return defaults != 0;
2980 }
2981
2982 void add(Method m) {
2983 if (length == methods.length) {
2984 methods = Arrays.copyOf(methods, 2 * methods.length);
2985 }
2986 methods[length++] = m;
2987
2988 if (m != null && m.isDefault())
2989 defaults++;
2990 }
2991
2992 void addAll(Method[] ma) {
2993 for (Method m : ma) {
2994 add(m);
2995 }
2996 }
2997
2998 void addAll(MethodArray ma) {
2999 for (int i = 0; i < ma.length(); i++) {
3000 add(ma.get(i));
3001 }
3002 }
3003
3004 void addIfNotPresent(Method newMethod) {
3005 for (int i = 0; i < length; i++) {
3006 Method m = methods[i];
3007 if (m == newMethod || (m != null && m.equals(newMethod))) {
3008 return;
3009 }
3010 }
3011 add(newMethod);
3012 }
3013
3014 void addAllIfNotPresent(MethodArray newMethods) {
3015 for (int i = 0; i < newMethods.length(); i++) {
3016 Method m = newMethods.get(i);
3017 if (m != null) {
3018 addIfNotPresent(m);
3019 }
3020 }
3021 }
3022
3023 /* Add Methods declared in an interface to this MethodArray.
3024 * Static methods declared in interfaces are not inherited.
3025 */
3026 void addInterfaceMethods(Method[] methods) {
3027 for (Method candidate : methods) {
3028 if (!Modifier.isStatic(candidate.getModifiers())) {
3029 add(candidate);
3030 }
3031 }
3032 }
3033
3034 int length() {
3035 return length;
3036 }
3037
3038 Method get(int i) {
3039 return methods[i];
3040 }
3041
3042 Method getFirst() {
3043 for (Method m : methods)
3044 if (m != null)
3045 return m;
3046 return null;
3047 }
3048
3049 void removeByNameAndDescriptor(Method toRemove) {
3050 for (int i = 0; i < length; i++) {
3051 Method m = methods[i];
3052 if (m != null && matchesNameAndDescriptor(m, toRemove)) {
3053 remove(i);
3054 }
3055 }
3056 }
3057
3058 private void remove(int i) {
3059 if (methods[i] != null && methods[i].isDefault())
3060 defaults--;
3061 methods[i] = null;
3062 }
3063
3064 private boolean matchesNameAndDescriptor(Method m1, Method m2) {
3065 return m1.getReturnType() == m2.getReturnType() &&
3066 m1.getName() == m2.getName() && // name is guaranteed to be interned
3067 arrayContentsEq(m1.getParameterTypes(),
3068 m2.getParameterTypes());
3069 }
3070
3071 void compactAndTrim() {
3072 int newPos = 0;
3073 // Get rid of null slots
3074 for (int pos = 0; pos < length; pos++) {
3075 Method m = methods[pos];
3076 if (m != null) {
3077 if (pos != newPos) {
3078 methods[newPos] = m;
3079 }
3080 newPos++;
3081 }
3082 }
3083 if (newPos != methods.length) {
3084 methods = Arrays.copyOf(methods, newPos);
3085 }
3086 }
3087
3088 /* Removes all Methods from this MethodArray that have a more specific
3089 * default Method in this MethodArray.
3090 *
3091 * Users of MethodArray are responsible for pruning Methods that have
3092 * a more specific <em>concrete</em> Method.
3093 */
3094 void removeLessSpecifics() {
3095 if (!hasDefaults())
3096 return;
3097
3098 for (int i = 0; i < length; i++) {
3099 Method m = get(i);
3100 if (m == null || !m.isDefault())
3101 continue;
3102
3103 for (int j = 0; j < length; j++) {
3104 if (i == j)
3105 continue;
3106
3107 Method candidate = get(j);
3108 if (candidate == null)
3109 continue;
3110
3111 if (!matchesNameAndDescriptor(m, candidate))
3112 continue;
3113
3114 if (hasMoreSpecificClass(m, candidate))
3115 remove(j);
3116 }
3117 }
3118 }
3119
3120 Method[] getArray() {
3121 return methods;
3122 }
3123
3124 // Returns true if m1 is more specific than m2
3125 static boolean hasMoreSpecificClass(Method m1, Method m2) {
3126 Class<?> m1Class = m1.getDeclaringClass();
3127 Class<?> m2Class = m2.getDeclaringClass();
3128 return m1Class != m2Class && m2Class.isAssignableFrom(m1Class);
3129 }
3130 }
3131
3132
3133 // Returns an array of "root" methods. These Method objects must NOT
3134 // be propagated to the outside world, but must instead be copied
3135 // via ReflectionFactory.copyMethod.
3136 private Method[] privateGetPublicMethods() {
3137 checkInitted();
3138 Method[] res;
3139 ReflectionData<T> rd = reflectionData();
3140 if (rd != null) {
3141 res = rd.publicMethods;
3142 if (res != null) return res;
3143 }
3144
3145 // No cached value available; compute value recursively.
3146 // Start by fetching public declared methods
3147 MethodArray methods = new MethodArray();
3148 {
3149 Method[] tmp = privateGetDeclaredMethods(true);
3150 methods.addAll(tmp);
3151 }
3152 // Now recur over superclass and direct superinterfaces.
3153 // Go over superinterfaces first so we can more easily filter
3154 // out concrete implementations inherited from superclasses at
3155 // the end.
3156 MethodArray inheritedMethods = new MethodArray();
3157 for (Class<?> i : getInterfaces()) {
3158 inheritedMethods.addInterfaceMethods(i.privateGetPublicMethods());
3159 }
3160 if (!isInterface()) {
3161 Class<?> c = getSuperclass();
3162 if (c != null) {
3163 MethodArray supers = new MethodArray();
3164 supers.addAll(c.privateGetPublicMethods());
3165 // Filter out concrete implementations of any
3166 // interface methods
3167 for (int i = 0; i < supers.length(); i++) {
3168 Method m = supers.get(i);
3169 if (m != null &&
3170 !Modifier.isAbstract(m.getModifiers()) &&
3171 !m.isDefault()) {
3172 inheritedMethods.removeByNameAndDescriptor(m);
3173 }
3174 }
3175 // Insert superclass's inherited methods before
3176 // superinterfaces' to satisfy getMethod's search
3177 // order
3178 supers.addAll(inheritedMethods);
3179 inheritedMethods = supers;
3180 }
3181 }
3182 // Filter out all local methods from inherited ones
3183 for (int i = 0; i < methods.length(); i++) {
3184 Method m = methods.get(i);
3185 inheritedMethods.removeByNameAndDescriptor(m);
3186 }
3187 methods.addAllIfNotPresent(inheritedMethods);
3188 methods.removeLessSpecifics();
3189 methods.compactAndTrim();
3190 res = methods.getArray();
3191 if (rd != null) {
3192 rd.publicMethods = res;
3193 }
3194 return res;
3195 }
3196
3197
3198 //
3199 // Helpers for fetchers of one field, method, or constructor
3200 //
3201
3202 private static Field searchFields(Field[] fields, String name) {
3203 String internedName = name.intern();
3204 for (Field field : fields) {
3205 if (field.getName() == internedName) {
3206 return getReflectionFactory().copyField(field);
3207 }
3208 }
3209 return null;
3210 }
3211
3212 private Field getField0(String name) throws NoSuchFieldException {
3213 // Note: the intent is that the search algorithm this routine
3214 // uses be equivalent to the ordering imposed by
3215 // privateGetPublicFields(). It fetches only the declared
3216 // public fields for each class, however, to reduce the number
3217 // of Field objects which have to be created for the common
3218 // case where the field being requested is declared in the
3219 // class which is being queried.
3220 Field res;
3221 // Search declared public fields
3222 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
3223 return res;
3224 }
3225 // Direct superinterfaces, recursively
3226 Class<?>[] interfaces = getInterfaces();
3227 for (Class<?> c : interfaces) {
3228 if ((res = c.getField0(name)) != null) {
3229 return res;
3230 }
3231 }
3232 // Direct superclass, recursively
3233 if (!isInterface()) {
3234 Class<?> c = getSuperclass();
3235 if (c != null) {
3236 if ((res = c.getField0(name)) != null) {
3237 return res;
3238 }
3239 }
3240 }
3241 return null;
3242 }
3243
3244 private static Method searchMethods(Method[] methods,
3245 String name,
3246 Class<?>[] parameterTypes)
3247 {
3248 Method res = null;
3249 String internedName = name.intern();
3250 for (Method m : methods) {
3251 if (m.getName() == internedName
3252 && arrayContentsEq(parameterTypes, m.getParameterTypes())
3253 && (res == null
3254 || res.getReturnType().isAssignableFrom(m.getReturnType())))
3255 res = m;
3256 }
3257
3258 return (res == null ? res : getReflectionFactory().copyMethod(res));
3259 }
3260
3261 private Method getMethod0(String name, Class<?>[] parameterTypes, boolean includeStaticMethods) {
3262 MethodArray interfaceCandidates = new MethodArray(2);
3263 Method res = privateGetMethodRecursive(name, parameterTypes, includeStaticMethods, interfaceCandidates);
3264 if (res != null)
3265 return res;
3266
3267 // Not found on class or superclass directly
3268 interfaceCandidates.removeLessSpecifics();
3269 return interfaceCandidates.getFirst(); // may be null
3270 }
3271
3272 private Method privateGetMethodRecursive(String name,
3273 Class<?>[] parameterTypes,
3274 boolean includeStaticMethods,
3275 MethodArray allInterfaceCandidates) {
3276 // Note: the intent is that the search algorithm this routine
3277 // uses be equivalent to the ordering imposed by
3278 // privateGetPublicMethods(). It fetches only the declared
3279 // public methods for each class, however, to reduce the
3280 // number of Method objects which have to be created for the
3281 // common case where the method being requested is declared in
3282 // the class which is being queried.
3283 //
3284 // Due to default methods, unless a method is found on a superclass,
3285 // methods declared in any superinterface needs to be considered.
3286 // Collect all candidates declared in superinterfaces in {@code
3287 // allInterfaceCandidates} and select the most specific if no match on
3288 // a superclass is found.
3289
3290 // Must _not_ return root methods
3291 Method res;
3292 // Search declared public methods
3293 if ((res = searchMethods(privateGetDeclaredMethods(true),
3294 name,
3295 parameterTypes)) != null) {
3296 if (includeStaticMethods || !Modifier.isStatic(res.getModifiers()))
3297 return res;
3298 }
3299 // Search superclass's methods
3300 if (!isInterface()) {
3301 Class<? super T> c = getSuperclass();
3302 if (c != null) {
3303 if ((res = c.getMethod0(name, parameterTypes, true)) != null) {
3304 return res;
3305 }
3306 }
3307 }
3308 // Search superinterfaces' methods
3309 Class<?>[] interfaces = getInterfaces();
3310 for (Class<?> c : interfaces)
3311 if ((res = c.getMethod0(name, parameterTypes, false)) != null)
3312 allInterfaceCandidates.add(res);
3313 // Not found
3314 return null;
3315 }
3316
3317 private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
3318 int which) throws NoSuchMethodException
3319 {
3320 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
3321 for (Constructor<T> constructor : constructors) {
3322 if (arrayContentsEq(parameterTypes,
3323 constructor.getParameterTypes())) {
3324 return getReflectionFactory().copyConstructor(constructor);
3325 }
3326 }
3327 throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes));
3328 }
3329
3330 //
3331 // Other helpers and base implementation
3332 //
3333
3334 private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
3335 if (a1 == null) {
3336 return a2 == null || a2.length == 0;
3337 }
3338
3339 if (a2 == null) {
3340 return a1.length == 0;
3341 }
3342
3343 if (a1.length != a2.length) {
3344 return false;
3345 }
3346
3347 for (int i = 0; i < a1.length; i++) {
3348 if (a1[i] != a2[i]) {
3349 return false;
3350 }
3351 }
3352
3353 return true;
3354 }
3355
3356 private static Field[] copyFields(Field[] arg) {
3357 Field[] out = new Field[arg.length];
3358 ReflectionFactory fact = getReflectionFactory();
3359 for (int i = 0; i < arg.length; i++) {
3360 out[i] = fact.copyField(arg[i]);
3361 }
3362 return out;
3363 }
3364
3365 private static Method[] copyMethods(Method[] arg) {
3366 Method[] out = new Method[arg.length];
3367 ReflectionFactory fact = getReflectionFactory();
3368 for (int i = 0; i < arg.length; i++) {
3369 out[i] = fact.copyMethod(arg[i]);
3370 }
3371 return out;
3372 }
3373
3374 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
3375 Constructor<U>[] out = arg.clone();
3376 ReflectionFactory fact = getReflectionFactory();
3377 for (int i = 0; i < out.length; i++) {
3378 out[i] = fact.copyConstructor(out[i]);
3379 }
3380 return out;
3381 }
3382
3383 private native Field[] getDeclaredFields0(boolean publicOnly);
3384 private native Method[] getDeclaredMethods0(boolean publicOnly);
3385 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
3386 private native Class<?>[] getDeclaredClasses0();
3387
3388 private static String argumentTypesToString(Class<?>[] argTypes) {
3389 StringJoiner sj = new StringJoiner(", ", "(", ")");
3390 if (argTypes != null) {
3391 for (int i = 0; i < argTypes.length; i++) {
3392 Class<?> c = argTypes[i];
3393 sj.add((c == null) ? "null" : c.getName());
3394 }
3395 }
3396 return sj.toString();
3397 }
3398
3399 /** use serialVersionUID from JDK 1.1 for interoperability */
3400 private static final long serialVersionUID = 3206093459760846163L;
3401
3402
3403 /**
3404 * Class Class is special cased within the Serialization Stream Protocol.
3405 *
3406 * A Class instance is written initially into an ObjectOutputStream in the
3407 * following format:
3408 * <pre>
3409 * {@code TC_CLASS} ClassDescriptor
3410 * A ClassDescriptor is a special cased serialization of
3411 * a {@code java.io.ObjectStreamClass} instance.
3412 * </pre>
3413 * A new handle is generated for the initial time the class descriptor
3414 * is written into the stream. Future references to the class descriptor
3415 * are written as references to the initial class descriptor instance.
3416 *
3417 * @see java.io.ObjectStreamClass
3418 */
3419 private static final ObjectStreamField[] serialPersistentFields =
3420 new ObjectStreamField[0];
3421
3422
3423 /**
3424 * Returns the assertion status that would be assigned to this
3425 * class if it were to be initialized at the time this method is invoked.
3426 * If this class has had its assertion status set, the most recent
3427 * setting will be returned; otherwise, if any package default assertion
3428 * status pertains to this class, the most recent setting for the most
3429 * specific pertinent package default assertion status is returned;
3430 * otherwise, if this class is not a system class (i.e., it has a
3431 * class loader) its class loader's default assertion status is returned;
3432 * otherwise, the system class default assertion status is returned.
3433 * <p>
3434 * Few programmers will have any need for this method; it is provided
3435 * for the benefit of the JRE itself. (It allows a class to determine at
3436 * the time that it is initialized whether assertions should be enabled.)
3437 * Note that this method is not guaranteed to return the actual
3438 * assertion status that was (or will be) associated with the specified
3439 * class when it was (or will be) initialized.
3440 *
3441 * @return the desired assertion status of the specified class.
3442 * @see java.lang.ClassLoader#setClassAssertionStatus
3443 * @see java.lang.ClassLoader#setPackageAssertionStatus
3444 * @see java.lang.ClassLoader#setDefaultAssertionStatus
3445 * @since 1.4
3446 */
3447 public boolean desiredAssertionStatus() {
3448 ClassLoader loader = getClassLoader();
3449 // If the loader is null this is a system class, so ask the VM
3450 if (loader == null)
3451 return desiredAssertionStatus0(this);
3452
3453 // If the classloader has been initialized with the assertion
3454 // directives, ask it. Otherwise, ask the VM.
3455 synchronized(loader.assertionLock) {
3456 if (loader.classAssertionStatus != null) {
3457 return loader.desiredAssertionStatus(getName());
3458 }
3459 }
3460 return desiredAssertionStatus0(this);
3461 }
3462
3463 // Retrieves the desired assertion status of this class from the VM
3464 private static native boolean desiredAssertionStatus0(Class<?> clazz);
3465
3466 /**
3467 * Returns true if and only if this class was declared as an enum in the
3468 * source code.
3469 *
3470 * @return true if and only if this class was declared as an enum in the
3471 * source code
3472 * @since 1.5
3473 */
3474 public boolean isEnum() {
3475 // An enum must both directly extend java.lang.Enum and have
3476 // the ENUM bit set; classes for specialized enum constants
3477 // don't do the former.
3478 return (this.getModifiers() & ENUM) != 0 &&
3479 this.getSuperclass() == java.lang.Enum.class;
3480 }
3481
3482 // Fetches the factory for reflective objects
3483 private static ReflectionFactory getReflectionFactory() {
3484 if (reflectionFactory == null) {
3485 reflectionFactory =
3486 java.security.AccessController.doPrivileged
3487 (new ReflectionFactory.GetReflectionFactoryAction());
3488 }
3489 return reflectionFactory;
3490 }
3491 private static ReflectionFactory reflectionFactory;
3492
3493 // To be able to query system properties as soon as they're available
3494 private static boolean initted = false;
3495 private static void checkInitted() {
3496 if (initted) return;
3497 AccessController.doPrivileged(new PrivilegedAction<>() {
3498 public Void run() {
3499 // Tests to ensure the system properties table is fully
3500 // initialized. This is needed because reflection code is
3501 // called very early in the initialization process (before
3502 // command-line arguments have been parsed and therefore
3503 // these user-settable properties installed.) We assume that
3504 // if System.out is non-null then the System class has been
3505 // fully initialized and that the bulk of the startup code
3506 // has been run.
3507
3508 if (System.out == null) {
3509 // java.lang.System not yet fully initialized
3510 return null;
3511 }
3512
3513 // Doesn't use Boolean.getBoolean to avoid class init.
3514 String val =
3515 System.getProperty("sun.reflect.noCaches");
3516 if (val != null && val.equals("true")) {
3517 useCaches = false;
3518 }
3519
3520 initted = true;
3521 return null;
3522 }
3523 });
3524 }
3525
3526 /**
3527 * Returns the elements of this enum class or null if this
3528 * Class object does not represent an enum type.
3529 *
3530 * @return an array containing the values comprising the enum class
3531 * represented by this Class object in the order they're
3532 * declared, or null if this Class object does not
3533 * represent an enum type
3534 * @since 1.5
3535 */
3536 public T[] getEnumConstants() {
3537 T[] values = getEnumConstantsShared();
3538 return (values != null) ? values.clone() : null;
3539 }
3540
3541 /**
3542 * Returns the elements of this enum class or null if this
3543 * Class object does not represent an enum type;
3544 * identical to getEnumConstants except that the result is
3545 * uncloned, cached, and shared by all callers.
3546 */
3547 T[] getEnumConstantsShared() {
3548 T[] constants = enumConstants;
3549 if (constants == null) {
3550 if (!isEnum()) return null;
3551 try {
3552 final Method values = getMethod("values");
3553 java.security.AccessController.doPrivileged(
3554 new java.security.PrivilegedAction<>() {
3555 public Void run() {
3556 values.setAccessible(true);
3557 return null;
3558 }
3559 });
3560 @SuppressWarnings("unchecked")
3561 T[] temporaryConstants = (T[])values.invoke(null);
3562 enumConstants = constants = temporaryConstants;
3563 }
3564 // These can happen when users concoct enum-like classes
3565 // that don't comply with the enum spec.
3566 catch (InvocationTargetException | NoSuchMethodException |
3567 IllegalAccessException ex) { return null; }
3568 }
3569 return constants;
3570 }
3571 private transient volatile T[] enumConstants;
3572
3573 /**
3574 * Returns a map from simple name to enum constant. This package-private
3575 * method is used internally by Enum to implement
3576 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
3577 * efficiently. Note that the map is returned by this method is
3578 * created lazily on first use. Typically it won't ever get created.
3579 */
3580 Map<String, T> enumConstantDirectory() {
3581 Map<String, T> directory = enumConstantDirectory;
3582 if (directory == null) {
3583 T[] universe = getEnumConstantsShared();
3584 if (universe == null)
3585 throw new IllegalArgumentException(
3586 getName() + " is not an enum type");
3587 directory = new HashMap<>(2 * universe.length);
3588 for (T constant : universe) {
3589 directory.put(((Enum<?>)constant).name(), constant);
3590 }
3591 enumConstantDirectory = directory;
3592 }
3593 return directory;
3594 }
3595 private transient volatile Map<String, T> enumConstantDirectory;
3596
3597 /**
3598 * Casts an object to the class or interface represented
3599 * by this {@code Class} object.
3600 *
3601 * @param obj the object to be cast
3602 * @return the object after casting, or null if obj is null
3603 *
3604 * @throws ClassCastException if the object is not
3605 * null and is not assignable to the type T.
3606 *
3607 * @since 1.5
3608 */
3609 @SuppressWarnings("unchecked")
3610 @HotSpotIntrinsicCandidate
3611 public T cast(Object obj) {
3612 if (obj != null && !isInstance(obj))
3613 throw new ClassCastException(cannotCastMsg(obj));
3614 return (T) obj;
3615 }
3616
3617 private String cannotCastMsg(Object obj) {
3618 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3619 }
3620
3621 /**
3622 * Casts this {@code Class} object to represent a subclass of the class
3623 * represented by the specified class object. Checks that the cast
3624 * is valid, and throws a {@code ClassCastException} if it is not. If
3625 * this method succeeds, it always returns a reference to this class object.
3626 *
3627 * <p>This method is useful when a client needs to "narrow" the type of
3628 * a {@code Class} object to pass it to an API that restricts the
3629 * {@code Class} objects that it is willing to accept. A cast would
3630 * generate a compile-time warning, as the correctness of the cast
3631 * could not be checked at runtime (because generic types are implemented
3632 * by erasure).
3633 *
3634 * @param <U> the type to cast this class object to
3635 * @param clazz the class of the type to cast this class object to
3636 * @return this {@code Class} object, cast to represent a subclass of
3637 * the specified class object.
3638 * @throws ClassCastException if this {@code Class} object does not
3639 * represent a subclass of the specified class (here "subclass" includes
3640 * the class itself).
3641 * @since 1.5
3642 */
3643 @SuppressWarnings("unchecked")
3644 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3645 if (clazz.isAssignableFrom(this))
3646 return (Class<? extends U>) this;
3647 else
3648 throw new ClassCastException(this.toString());
3649 }
3650
3651 /**
3652 * @throws NullPointerException {@inheritDoc}
3653 * @since 1.5
3654 */
3655 @SuppressWarnings("unchecked")
3656 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3657 Objects.requireNonNull(annotationClass);
3658
3659 return (A) annotationData().annotations.get(annotationClass);
3660 }
3661
3662 /**
3663 * {@inheritDoc}
3664 * @throws NullPointerException {@inheritDoc}
3665 * @since 1.5
3666 */
3667 @Override
3668 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3669 return GenericDeclaration.super.isAnnotationPresent(annotationClass);
3670 }
3671
3672 /**
3673 * @throws NullPointerException {@inheritDoc}
3674 * @since 1.8
3675 */
3676 @Override
3677 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
3678 Objects.requireNonNull(annotationClass);
3679
3680 AnnotationData annotationData = annotationData();
3681 return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
3682 this,
3683 annotationClass);
3684 }
3685
3686 /**
3687 * @since 1.5
3688 */
3689 public Annotation[] getAnnotations() {
3690 return AnnotationParser.toArray(annotationData().annotations);
3691 }
3692
3693 /**
3694 * @throws NullPointerException {@inheritDoc}
3695 * @since 1.8
3696 */
3697 @Override
3698 @SuppressWarnings("unchecked")
3699 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3700 Objects.requireNonNull(annotationClass);
3701
3702 return (A) annotationData().declaredAnnotations.get(annotationClass);
3703 }
3704
3705 /**
3706 * @throws NullPointerException {@inheritDoc}
3707 * @since 1.8
3708 */
3709 @Override
3710 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
3711 Objects.requireNonNull(annotationClass);
3712
3713 return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
3714 annotationClass);
3715 }
3716
3717 /**
3718 * @since 1.5
3719 */
3720 public Annotation[] getDeclaredAnnotations() {
3721 return AnnotationParser.toArray(annotationData().declaredAnnotations);
3722 }
3723
3724 // annotation data that might get invalidated when JVM TI RedefineClasses() is called
3725 private static class AnnotationData {
3726 final Map<Class<? extends Annotation>, Annotation> annotations;
3727 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3728
3729 // Value of classRedefinedCount when we created this AnnotationData instance
3730 final int redefinedCount;
3731
3732 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
3733 Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
3734 int redefinedCount) {
3735 this.annotations = annotations;
3736 this.declaredAnnotations = declaredAnnotations;
3737 this.redefinedCount = redefinedCount;
3738 }
3739 }
3740
3741 // Annotations cache
3742 @SuppressWarnings("UnusedDeclaration")
3743 private transient volatile AnnotationData annotationData;
3744
3745 private AnnotationData annotationData() {
3746 while (true) { // retry loop
3747 AnnotationData annotationData = this.annotationData;
3748 int classRedefinedCount = this.classRedefinedCount;
3749 if (annotationData != null &&
3750 annotationData.redefinedCount == classRedefinedCount) {
3751 return annotationData;
3752 }
3753 // null or stale annotationData -> optimistically create new instance
3754 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
3755 // try to install it
3756 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
3757 // successfully installed new AnnotationData
3758 return newAnnotationData;
3759 }
3760 }
3761 }
3762
3763 private AnnotationData createAnnotationData(int classRedefinedCount) {
3764 Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
3765 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
3766 Class<?> superClass = getSuperclass();
3767 Map<Class<? extends Annotation>, Annotation> annotations = null;
3768 if (superClass != null) {
3769 Map<Class<? extends Annotation>, Annotation> superAnnotations =
3770 superClass.annotationData().annotations;
3771 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
3772 Class<? extends Annotation> annotationClass = e.getKey();
3773 if (AnnotationType.getInstance(annotationClass).isInherited()) {
3774 if (annotations == null) { // lazy construction
3775 annotations = new LinkedHashMap<>((Math.max(
3776 declaredAnnotations.size(),
3777 Math.min(12, declaredAnnotations.size() + superAnnotations.size())
3778 ) * 4 + 2) / 3
3779 );
3780 }
3781 annotations.put(annotationClass, e.getValue());
3782 }
3783 }
3784 }
3785 if (annotations == null) {
3786 // no inherited annotations -> share the Map with declaredAnnotations
3787 annotations = declaredAnnotations;
3788 } else {
3789 // at least one inherited annotation -> declared may override inherited
3790 annotations.putAll(declaredAnnotations);
3791 }
3792 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
3793 }
3794
3795 // Annotation types cache their internal (AnnotationType) form
3796
3797 @SuppressWarnings("UnusedDeclaration")
3798 private transient volatile AnnotationType annotationType;
3799
3800 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
3801 return Atomic.casAnnotationType(this, oldType, newType);
3802 }
3803
3804 AnnotationType getAnnotationType() {
3805 return annotationType;
3806 }
3807
3808 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() {
3809 return annotationData().declaredAnnotations;
3810 }
3811
3812 /* Backing store of user-defined values pertaining to this class.
3813 * Maintained by the ClassValue class.
3814 */
3815 transient ClassValue.ClassValueMap classValueMap;
3816
3817 /**
3818 * Returns an {@code AnnotatedType} object that represents the use of a
3819 * type to specify the superclass of the entity represented by this {@code
3820 * Class} object. (The <em>use</em> of type Foo to specify the superclass
3821 * in '... extends Foo' is distinct from the <em>declaration</em> of type
3822 * Foo.)
3823 *
3824 * <p> If this {@code Class} object represents a type whose declaration
3825 * does not explicitly indicate an annotated superclass, then the return
3826 * value is an {@code AnnotatedType} object representing an element with no
3827 * annotations.
3828 *
3829 * <p> If this {@code Class} represents either the {@code Object} class, an
3830 * interface type, an array type, a primitive type, or void, the return
3831 * value is {@code null}.
3832 *
3833 * @return an object representing the superclass
3834 * @since 1.8
3835 */
3836 public AnnotatedType getAnnotatedSuperclass() {
3837 if (this == Object.class ||
3838 isInterface() ||
3839 isArray() ||
3840 isPrimitive() ||
3841 this == Void.TYPE) {
3842 return null;
3843 }
3844
3845 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
3846 }
3847
3848 /**
3849 * Returns an array of {@code AnnotatedType} objects that represent the use
3850 * of types to specify superinterfaces of the entity represented by this
3851 * {@code Class} object. (The <em>use</em> of type Foo to specify a
3852 * superinterface in '... implements Foo' is distinct from the
3853 * <em>declaration</em> of type Foo.)
3854 *
3855 * <p> If this {@code Class} object represents a class, the return value is
3856 * an array containing objects representing the uses of interface types to
3857 * specify interfaces implemented by the class. The order of the objects in
3858 * the array corresponds to the order of the interface types used in the
3859 * 'implements' clause of the declaration of this {@code Class} object.
3860 *
3861 * <p> If this {@code Class} object represents an interface, the return
3862 * value is an array containing objects representing the uses of interface
3863 * types to specify interfaces directly extended by the interface. The
3864 * order of the objects in the array corresponds to the order of the
3865 * interface types used in the 'extends' clause of the declaration of this
3866 * {@code Class} object.
3867 *
3868 * <p> If this {@code Class} object represents a class or interface whose
3869 * declaration does not explicitly indicate any annotated superinterfaces,
3870 * the return value is an array of length 0.
3871 *
3872 * <p> If this {@code Class} object represents either the {@code Object}
3873 * class, an array type, a primitive type, or void, the return value is an
3874 * array of length 0.
3875 *
3876 * @return an array representing the superinterfaces
3877 * @since 1.8
3878 */
3879 public AnnotatedType[] getAnnotatedInterfaces() {
3880 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
3881 }
3882 }