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.ModuleDescriptor.Version;
30 import java.lang.module.ModuleFinder;
31 import java.lang.module.ModuleReader;
32 import java.lang.ref.SoftReference;
33 import java.io.IOException;
34 import java.io.InputStream;
35 import java.io.ObjectStreamField;
36 import java.lang.reflect.AnnotatedElement;
37 import java.lang.reflect.AnnotatedType;
38 import java.lang.reflect.Array;
39 import java.lang.reflect.Constructor;
40 import java.lang.reflect.Executable;
41 import java.lang.reflect.Field;
42 import java.lang.reflect.GenericArrayType;
43 import java.lang.reflect.GenericDeclaration;
44 import java.lang.reflect.InvocationTargetException;
45 import java.lang.reflect.Layer;
46 import java.lang.reflect.Member;
47 import java.lang.reflect.Method;
48 import java.lang.reflect.Modifier;
49 import java.lang.reflect.Module;
50 import java.lang.reflect.Proxy;
51 import java.lang.reflect.Type;
52 import java.lang.reflect.TypeVariable;
53 import java.net.URL;
54 import java.security.AccessController;
55 import java.security.PrivilegedAction;
56 import java.util.ArrayList;
57 import java.util.Arrays;
58 import java.util.Collection;
59 import java.util.HashMap;
60 import java.util.HashSet;
61 import java.util.LinkedHashMap;
62 import java.util.List;
63 import java.util.Map;
64 import java.util.Objects;
65 import java.util.Optional;
66 import java.util.Set;
67 import java.util.StringJoiner;
68 import java.util.stream.Collectors;
69
70 import jdk.internal.HotSpotIntrinsicCandidate;
71 import jdk.internal.loader.BootLoader;
72 import jdk.internal.loader.BuiltinClassLoader;
73 import jdk.internal.loader.ResourceHelper;
74 import jdk.internal.misc.SharedSecrets;
75 import jdk.internal.misc.Unsafe;
76 import jdk.internal.misc.VM;
77 import jdk.internal.module.ModuleHashes;
78 import jdk.internal.reflect.CallerSensitive;
79 import jdk.internal.reflect.ConstantPool;
80 import jdk.internal.reflect.Reflection;
81 import jdk.internal.reflect.ReflectionFactory;
82 import jdk.internal.vm.annotation.ForceInline;
83 import sun.reflect.generics.factory.CoreReflectionFactory;
84 import sun.reflect.generics.factory.GenericsFactory;
85 import sun.reflect.generics.repository.ClassRepository;
86 import sun.reflect.generics.repository.MethodRepository;
87 import sun.reflect.generics.repository.ConstructorRepository;
88 import sun.reflect.generics.scope.ClassScope;
89 import sun.security.util.SecurityConstants;
90 import sun.reflect.annotation.*;
91 import sun.reflect.misc.ReflectUtil;
92
93 /**
94 * Instances of the class {@code Class} represent classes and
95 * interfaces in a running Java application. An enum is a kind of
96 * class and an annotation is a kind of interface. Every array also
97 * belongs to a class that is reflected as a {@code Class} object
98 * that is shared by all arrays with the same element type and number
99 * of dimensions. The primitive Java types ({@code boolean},
100 * {@code byte}, {@code char}, {@code short},
101 * {@code int}, {@code long}, {@code float}, and
102 * {@code double}), and the keyword {@code void} are also
103 * represented as {@code Class} objects.
104 *
105 * <p> {@code Class} has no public constructor. Instead {@code Class}
106 * objects are constructed automatically by the Java Virtual Machine as classes
107 * are loaded and by calls to the {@code defineClass} method in the class
108 * loader.
109 *
110 * <p> The following example uses a {@code Class} object to print the
111 * class name of an object:
112 *
113 * <blockquote><pre>
114 * void printClassName(Object obj) {
115 * System.out.println("The class of " + obj +
116 * " is " + obj.getClass().getName());
117 * }
118 * </pre></blockquote>
119 *
120 * <p> It is also possible to get the {@code Class} object for a named
121 * type (or for void) using a class literal. See Section 15.8.2 of
122 * <cite>The Java™ Language Specification</cite>.
123 * For example:
124 *
125 * <blockquote>
126 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
127 * </blockquote>
128 *
129 * @param <T> the type of the class modeled by this {@code Class}
130 * object. For example, the type of {@code String.class} is {@code
131 * Class<String>}. Use {@code Class<?>} if the class being modeled is
132 * unknown.
133 *
134 * @author unascribed
135 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
136 * @since 1.0
137 */
138 public final class Class<T> implements java.io.Serializable,
139 GenericDeclaration,
140 Type,
141 AnnotatedElement {
142 private static final int ANNOTATION= 0x00002000;
143 private static final int ENUM = 0x00004000;
144 private static final int SYNTHETIC = 0x00001000;
145
146 private static native void registerNatives();
147 static {
148 registerNatives();
149 }
150
151 /*
152 * Private constructor. Only the Java Virtual Machine creates Class objects.
153 * This constructor is not used and prevents the default constructor being
154 * generated.
155 */
156 private Class(ClassLoader loader, Class<?> arrayComponentType) {
157 // Initialize final field for classLoader. The initialization value of non-null
158 // prevents future JIT optimizations from assuming this final field is null.
159 classLoader = loader;
160 componentType = arrayComponentType;
161 }
162
163 /**
164 * Converts the object to a string. The string representation is the
165 * string "class" or "interface", followed by a space, and then by the
166 * fully qualified name of the class in the format returned by
167 * {@code getName}. If this {@code Class} object represents a
168 * primitive type, this method returns the name of the primitive type. If
169 * this {@code Class} object represents void this method returns
170 * "void". If this {@code Class} object represents an array type,
171 * this method returns "class " followed by {@code getName}.
172 *
173 * @return a string representation of this class object.
174 */
175 public String toString() {
176 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
177 + getName();
178 }
179
180 /**
181 * Returns a string describing this {@code Class}, including
182 * information about modifiers and type parameters.
183 *
184 * The string is formatted as a list of type modifiers, if any,
185 * followed by the kind of type (empty string for primitive types
186 * and {@code class}, {@code enum}, {@code interface}, or
187 * <code>@</code>{@code interface}, as appropriate), followed
188 * by the type's name, followed by an angle-bracketed
189 * comma-separated list of the type's type parameters, if any.
190 *
191 * A space is used to separate modifiers from one another and to
192 * separate any modifiers from the kind of type. The modifiers
193 * occur in canonical order. If there are no type parameters, the
194 * type parameter list is elided.
195 *
196 * For an array type, the string starts with the type name,
197 * followed by an angle-bracketed comma-separated list of the
198 * type's type parameters, if any, followed by a sequence of
199 * {@code []} characters, one set of brackets per dimension of
200 * the array.
201 *
202 * <p>Note that since information about the runtime representation
203 * of a type is being generated, modifiers not present on the
204 * originating source code or illegal on the originating source
205 * code may be present.
206 *
207 * @return a string describing this {@code Class}, including
208 * information about modifiers and type parameters
209 *
210 * @since 1.8
211 */
212 public String toGenericString() {
213 if (isPrimitive()) {
214 return toString();
215 } else {
216 StringBuilder sb = new StringBuilder();
217 Class<?> component = this;
218 int arrayDepth = 0;
219
220 if (isArray()) {
221 do {
222 arrayDepth++;
223 component = component.getComponentType();
224 } while (component.isArray());
225 sb.append(component.getName());
226 } else {
227 // Class modifiers are a superset of interface modifiers
228 int modifiers = getModifiers() & Modifier.classModifiers();
229 if (modifiers != 0) {
230 sb.append(Modifier.toString(modifiers));
231 sb.append(' ');
232 }
233
234 if (isAnnotation()) {
235 sb.append('@');
236 }
237 if (isInterface()) { // Note: all annotation types are interfaces
238 sb.append("interface");
239 } else {
240 if (isEnum())
241 sb.append("enum");
242 else
243 sb.append("class");
244 }
245 sb.append(' ');
246 sb.append(getName());
247 }
248
249 TypeVariable<?>[] typeparms = component.getTypeParameters();
250 if (typeparms.length > 0) {
251 StringJoiner sj = new StringJoiner(",", "<", ">");
252 for(TypeVariable<?> typeparm: typeparms) {
253 sj.add(typeparm.getTypeName());
254 }
255 sb.append(sj.toString());
256 }
257
258 for (int i = 0; i < arrayDepth; i++)
259 sb.append("[]");
260
261 return sb.toString();
262 }
263 }
264
265 /**
266 * Returns the {@code Class} object associated with the class or
267 * interface with the given string name. Invoking this method is
268 * equivalent to:
269 *
270 * <blockquote>
271 * {@code Class.forName(className, true, currentLoader)}
272 * </blockquote>
273 *
274 * where {@code currentLoader} denotes the defining class loader of
275 * the current class.
276 *
277 * <p> For example, the following code fragment returns the
278 * runtime {@code Class} descriptor for the class named
279 * {@code java.lang.Thread}:
280 *
281 * <blockquote>
282 * {@code Class t = Class.forName("java.lang.Thread")}
283 * </blockquote>
284 * <p>
285 * A call to {@code forName("X")} causes the class named
286 * {@code X} to be initialized.
287 *
288 * @param className the fully qualified name of the desired class.
289 * @return the {@code Class} object for the class with the
290 * specified name.
291 * @exception LinkageError if the linkage fails
292 * @exception ExceptionInInitializerError if the initialization provoked
293 * by this method fails
294 * @exception ClassNotFoundException if the class cannot be located
295 */
296 @CallerSensitive
297 public static Class<?> forName(String className)
298 throws ClassNotFoundException {
299 Class<?> caller = Reflection.getCallerClass();
300 return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
301 }
302
303
304 /**
305 * Returns the {@code Class} object associated with the class or
306 * interface with the given string name, using the given class loader.
307 * Given the fully qualified name for a class or interface (in the same
308 * format returned by {@code getName}) this method attempts to
309 * locate, load, and link the class or interface. The specified class
310 * loader is used to load the class or interface. If the parameter
311 * {@code loader} is null, the class is loaded through the bootstrap
312 * class loader. The class is initialized only if the
313 * {@code initialize} parameter is {@code true} and if it has
314 * not been initialized earlier.
315 *
316 * <p> If {@code name} denotes a primitive type or void, an attempt
317 * will be made to locate a user-defined class in the unnamed package whose
318 * name is {@code name}. Therefore, this method cannot be used to
319 * obtain any of the {@code Class} objects representing primitive
320 * types or void.
321 *
322 * <p> If {@code name} denotes an array class, the component type of
323 * the array class is loaded but not initialized.
324 *
325 * <p> For example, in an instance method the expression:
326 *
327 * <blockquote>
328 * {@code Class.forName("Foo")}
329 * </blockquote>
330 *
331 * is equivalent to:
332 *
333 * <blockquote>
334 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
335 * </blockquote>
336 *
337 * Note that this method throws errors related to loading, linking or
338 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
339 * Java Language Specification</em>.
340 * Note that this method does not check whether the requested class
341 * is accessible to its caller.
342 *
343 * @param name fully qualified name of the desired class
344 * @param initialize if {@code true} the class will be initialized.
345 * See Section 12.4 of <em>The Java Language Specification</em>.
346 * @param loader class loader from which the class must be loaded
347 * @return class object representing the desired class
348 *
349 * @exception LinkageError if the linkage fails
350 * @exception ExceptionInInitializerError if the initialization provoked
351 * by this method fails
352 * @exception ClassNotFoundException if the class cannot be located by
353 * the specified class loader
354 * @exception SecurityException
355 * if a security manager is present, and the {@code loader} is
356 * {@code null}, and the caller's class loader is not
357 * {@code null}, and the caller does not have the
358 * {@link RuntimePermission}{@code ("getClassLoader")}
359 *
360 * @see java.lang.Class#forName(String)
361 * @see java.lang.ClassLoader
362 * @since 1.2
363 */
364 @CallerSensitive
365 public static Class<?> forName(String name, boolean initialize,
366 ClassLoader loader)
367 throws ClassNotFoundException
368 {
369 Class<?> caller = null;
370 SecurityManager sm = System.getSecurityManager();
371 if (sm != null) {
372 // Reflective call to get caller class is only needed if a security manager
373 // is present. Avoid the overhead of making this call otherwise.
374 caller = Reflection.getCallerClass();
375 if (VM.isSystemDomainLoader(loader)) {
376 ClassLoader ccl = ClassLoader.getClassLoader(caller);
377 if (!VM.isSystemDomainLoader(ccl)) {
378 sm.checkPermission(
379 SecurityConstants.GET_CLASSLOADER_PERMISSION);
380 }
381 }
382 }
383 return forName0(name, initialize, loader, caller);
384 }
385
386 /** Called after security check for system loader access checks have been made. */
387 private static native Class<?> forName0(String name, boolean initialize,
388 ClassLoader loader,
389 Class<?> caller)
390 throws ClassNotFoundException;
391
392
393 /**
394 * Returns the {@code Class} with the given <a href="ClassLoader.html#name">
395 * binary name</a> in the given module.
396 *
397 * <p> This method attempts to locate, load, and link the class or interface.
398 * It does not run the class initializer. If the class is not found, this
399 * method returns {@code null}. </p>
400 *
401 * <p> If the class loader of the given module defines other modules and
402 * the given name is a class defined in a different module, this method
403 * returns {@code null} after the class is loaded. </p>
404 *
405 * <p> This method does not check whether the requested class is
406 * accessible to its caller. </p>
407 *
408 * @apiNote
409 * This method returns {@code null} on failure rather than
410 * throwing a {@link ClassNotFoundException}, as is done by
411 * the {@link #forName(String, boolean, ClassLoader)} method.
412 * The security check is a stack-based permission check if the caller
413 * loads a class in another module.
414 *
415 * @param module A module
416 * @param name The <a href="ClassLoader.html#name">binary name</a>
417 * of the class
418 * @return {@code Class} object of the given name defined in the given module;
419 * {@code null} if not found.
420 *
421 * @throws NullPointerException if the given module or name is {@code null}
422 *
423 * @throws LinkageError if the linkage fails
424 *
425 * @throws SecurityException
426 * <ul>
427 * <li> if the caller is not the specified module and
428 * {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
429 * <li> access to the module content is denied. For example,
430 * permission check will be performed when a class loader calls
431 * {@link ModuleReader#open(String)} to read the bytes of a class file
432 * in a module.</li>
433 * </ul>
434 *
435 * @since 9
436 */
437 @CallerSensitive
438 public static Class<?> forName(Module module, String name) {
439 Objects.requireNonNull(module);
440 Objects.requireNonNull(name);
441
442 Class<?> caller = Reflection.getCallerClass();
443 if (caller != null && caller.getModule() != module) {
444 // if caller is null, Class.forName is the last java frame on the stack.
445 // java.base has all permissions
446 SecurityManager sm = System.getSecurityManager();
447 if (sm != null) {
448 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
449 }
450 }
451
452 PrivilegedAction<ClassLoader> pa = module::getClassLoader;
453 ClassLoader cl = AccessController.doPrivileged(pa);
454 if (cl != null) {
455 return cl.loadClass(module, name);
456 } else {
457 return BootLoader.loadClass(module, name);
458 }
459 }
460
461 /**
462 * Creates a new instance of the class represented by this {@code Class}
463 * object. The class is instantiated as if by a {@code new}
464 * expression with an empty argument list. The class is initialized if it
465 * has not already been initialized.
466 *
467 * @deprecated This method propagates any exception thrown by the
468 * nullary constructor, including a checked exception. Use of
469 * this method effectively bypasses the compile-time exception
470 * checking that would otherwise be performed by the compiler.
471 * The {@link
472 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
473 * Constructor.newInstance} method avoids this problem by wrapping
474 * any exception thrown by the constructor in a (checked) {@link
475 * java.lang.reflect.InvocationTargetException}.
476 *
477 * <p>The call
478 *
479 * <pre>{@code
480 * clazz.newInstance()
481 * }</pre>
482 *
483 * can be replaced by
484 *
485 * <pre>{@code
486 * clazz.getDeclaredConstructor().newInstance()
487 * }</pre>
488 *
489 * The latter sequence of calls is inferred to be able to throw
490 * the additional exception types {@link
491 * InvocationTargetException} and {@link
492 * NoSuchMethodException}. Both of these exception types are
493 * subclasses of {@link ReflectiveOperationException}.
494 *
495 * @return a newly allocated instance of the class represented by this
496 * object.
497 * @throws IllegalAccessException if the class or its nullary
498 * constructor is not accessible.
499 * @throws InstantiationException
500 * if this {@code Class} represents an abstract class,
501 * an interface, an array class, a primitive type, or void;
502 * or if the class has no nullary constructor;
503 * or if the instantiation fails for some other reason.
504 * @throws ExceptionInInitializerError if the initialization
505 * provoked by this method fails.
506 * @throws SecurityException
507 * If a security manager, <i>s</i>, is present and
508 * the caller's class loader is not the same as or an
509 * ancestor of the class loader for the current class and
510 * invocation of {@link SecurityManager#checkPackageAccess
511 * s.checkPackageAccess()} denies access to the package
512 * of this class.
513 */
514 @CallerSensitive
515 @Deprecated(since="9")
516 public T newInstance()
517 throws InstantiationException, IllegalAccessException
518 {
519 if (System.getSecurityManager() != null) {
520 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
521 }
522
523 // NOTE: the following code may not be strictly correct under
524 // the current Java memory model.
525
526 // Constructor lookup
527 if (cachedConstructor == null) {
528 if (this == Class.class) {
529 throw new IllegalAccessException(
530 "Can not call newInstance() on the Class for java.lang.Class"
531 );
532 }
533 try {
534 Class<?>[] empty = {};
535 final Constructor<T> c = getConstructor0(empty, Member.DECLARED);
536 // Disable accessibility checks on the constructor
537 // since we have to do the security check here anyway
538 // (the stack depth is wrong for the Constructor's
539 // security check to work)
540 java.security.AccessController.doPrivileged(
541 new java.security.PrivilegedAction<>() {
542 public Void run() {
543 c.setAccessible(true);
544 return null;
545 }
546 });
547 cachedConstructor = c;
548 } catch (NoSuchMethodException e) {
549 throw (InstantiationException)
550 new InstantiationException(getName()).initCause(e);
551 }
552 }
553 Constructor<T> tmpConstructor = cachedConstructor;
554 // Security check (same as in java.lang.reflect.Constructor)
555 Class<?> caller = Reflection.getCallerClass();
556 if (newInstanceCallerCache != caller) {
557 int modifiers = tmpConstructor.getModifiers();
558 Reflection.ensureMemberAccess(caller, this, this, modifiers);
559 newInstanceCallerCache = caller;
560 }
561 // Run constructor
562 try {
563 return tmpConstructor.newInstance((Object[])null);
564 } catch (InvocationTargetException e) {
565 Unsafe.getUnsafe().throwException(e.getTargetException());
566 // Not reached
567 return null;
568 }
569 }
570 private transient volatile Constructor<T> cachedConstructor;
571 private transient volatile Class<?> newInstanceCallerCache;
572
573
574 /**
575 * Determines if the specified {@code Object} is assignment-compatible
576 * with the object represented by this {@code Class}. This method is
577 * the dynamic equivalent of the Java language {@code instanceof}
578 * operator. The method returns {@code true} if the specified
579 * {@code Object} argument is non-null and can be cast to the
580 * reference type represented by this {@code Class} object without
581 * raising a {@code ClassCastException.} It returns {@code false}
582 * otherwise.
583 *
584 * <p> Specifically, if this {@code Class} object represents a
585 * declared class, this method returns {@code true} if the specified
586 * {@code Object} argument is an instance of the represented class (or
587 * of any of its subclasses); it returns {@code false} otherwise. If
588 * this {@code Class} object represents an array class, this method
589 * returns {@code true} if the specified {@code Object} argument
590 * can be converted to an object of the array class by an identity
591 * conversion or by a widening reference conversion; it returns
592 * {@code false} otherwise. If this {@code Class} object
593 * represents an interface, this method returns {@code true} if the
594 * class or any superclass of the specified {@code Object} argument
595 * implements this interface; it returns {@code false} otherwise. If
596 * this {@code Class} object represents a primitive type, this method
597 * returns {@code false}.
598 *
599 * @param obj the object to check
600 * @return true if {@code obj} is an instance of this class
601 *
602 * @since 1.1
603 */
604 @HotSpotIntrinsicCandidate
605 public native boolean isInstance(Object obj);
606
607
608 /**
609 * Determines if the class or interface represented by this
610 * {@code Class} object is either the same as, or is a superclass or
611 * superinterface of, the class or interface represented by the specified
612 * {@code Class} parameter. It returns {@code true} if so;
613 * otherwise it returns {@code false}. If this {@code Class}
614 * object represents a primitive type, this method returns
615 * {@code true} if the specified {@code Class} parameter is
616 * exactly this {@code Class} object; otherwise it returns
617 * {@code false}.
618 *
619 * <p> Specifically, this method tests whether the type represented by the
620 * specified {@code Class} parameter can be converted to the type
621 * represented by this {@code Class} object via an identity conversion
622 * or via a widening reference conversion. See <em>The Java Language
623 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
624 *
625 * @param cls the {@code Class} object to be checked
626 * @return the {@code boolean} value indicating whether objects of the
627 * type {@code cls} can be assigned to objects of this class
628 * @exception NullPointerException if the specified Class parameter is
629 * null.
630 * @since 1.1
631 */
632 @HotSpotIntrinsicCandidate
633 public native boolean isAssignableFrom(Class<?> cls);
634
635
636 /**
637 * Determines if the specified {@code Class} object represents an
638 * interface type.
639 *
640 * @return {@code true} if this object represents an interface;
641 * {@code false} otherwise.
642 */
643 @HotSpotIntrinsicCandidate
644 public native boolean isInterface();
645
646
647 /**
648 * Determines if this {@code Class} object represents an array class.
649 *
650 * @return {@code true} if this object represents an array class;
651 * {@code false} otherwise.
652 * @since 1.1
653 */
654 @HotSpotIntrinsicCandidate
655 public native boolean isArray();
656
657
658 /**
659 * Determines if the specified {@code Class} object represents a
660 * primitive type.
661 *
662 * <p> There are nine predefined {@code Class} objects to represent
663 * the eight primitive types and void. These are created by the Java
664 * Virtual Machine, and have the same names as the primitive types that
665 * they represent, namely {@code boolean}, {@code byte},
666 * {@code char}, {@code short}, {@code int},
667 * {@code long}, {@code float}, and {@code double}.
668 *
669 * <p> These objects may only be accessed via the following public static
670 * final variables, and are the only {@code Class} objects for which
671 * this method returns {@code true}.
672 *
673 * @return true if and only if this class represents a primitive type
674 *
675 * @see java.lang.Boolean#TYPE
676 * @see java.lang.Character#TYPE
677 * @see java.lang.Byte#TYPE
678 * @see java.lang.Short#TYPE
679 * @see java.lang.Integer#TYPE
680 * @see java.lang.Long#TYPE
681 * @see java.lang.Float#TYPE
682 * @see java.lang.Double#TYPE
683 * @see java.lang.Void#TYPE
684 * @since 1.1
685 */
686 @HotSpotIntrinsicCandidate
687 public native boolean isPrimitive();
688
689 /**
690 * Returns true if this {@code Class} object represents an annotation
691 * type. Note that if this method returns true, {@link #isInterface()}
692 * would also return true, as all annotation types are also interfaces.
693 *
694 * @return {@code true} if this class object represents an annotation
695 * type; {@code false} otherwise
696 * @since 1.5
697 */
698 public boolean isAnnotation() {
699 return (getModifiers() & ANNOTATION) != 0;
700 }
701
702 /**
703 * Returns {@code true} if this class is a synthetic class;
704 * returns {@code false} otherwise.
705 * @return {@code true} if and only if this class is a synthetic class as
706 * defined by the Java Language Specification.
707 * @jls 13.1 The Form of a Binary
708 * @since 1.5
709 */
710 public boolean isSynthetic() {
711 return (getModifiers() & SYNTHETIC) != 0;
712 }
713
714 /**
715 * Returns the name of the entity (class, interface, array class,
716 * primitive type, or void) represented by this {@code Class} object,
717 * as a {@code String}.
718 *
719 * <p> If this class object represents a reference type that is not an
720 * array type then the binary name of the class is returned, as specified
721 * by
722 * <cite>The Java™ Language Specification</cite>.
723 *
724 * <p> If this class object represents a primitive type or void, then the
725 * name returned is a {@code String} equal to the Java language
726 * keyword corresponding to the primitive type or void.
727 *
728 * <p> If this class object represents a class of arrays, then the internal
729 * form of the name consists of the name of the element type preceded by
730 * one or more '{@code [}' characters representing the depth of the array
731 * nesting. The encoding of element type names is as follows:
732 *
733 * <blockquote><table summary="Element types and encodings">
734 * <tr><th> Element Type <th> <th> Encoding
735 * <tr><td> boolean <td> <td align=center> Z
736 * <tr><td> byte <td> <td align=center> B
737 * <tr><td> char <td> <td align=center> C
738 * <tr><td> class or interface
739 * <td> <td align=center> L<i>classname</i>;
740 * <tr><td> double <td> <td align=center> D
741 * <tr><td> float <td> <td align=center> F
742 * <tr><td> int <td> <td align=center> I
743 * <tr><td> long <td> <td align=center> J
744 * <tr><td> short <td> <td align=center> S
745 * </table></blockquote>
746 *
747 * <p> The class or interface name <i>classname</i> is the binary name of
748 * the class specified above.
749 *
750 * <p> Examples:
751 * <blockquote><pre>
752 * String.class.getName()
753 * returns "java.lang.String"
754 * byte.class.getName()
755 * returns "byte"
756 * (new Object[3]).getClass().getName()
757 * returns "[Ljava.lang.Object;"
758 * (new int[3][4][5][6][7][8][9]).getClass().getName()
759 * returns "[[[[[[[I"
760 * </pre></blockquote>
761 *
762 * @return the name of the class or interface
763 * represented by this object.
764 */
765 public String getName() {
766 String name = this.name;
767 if (name == null)
768 this.name = name = getName0();
769 return name;
770 }
771
772 // cache the name to reduce the number of calls into the VM
773 private transient String name;
774 private native String getName0();
775
776 /**
777 * Returns the class loader for the class. Some implementations may use
778 * null to represent the bootstrap class loader. This method will return
779 * null in such implementations if this class was loaded by the bootstrap
780 * class loader.
781 *
782 * <p>If this object
783 * represents a primitive type or void, null is returned.
784 *
785 * @return the class loader that loaded the class or interface
786 * represented by this object.
787 * @throws SecurityException
788 * if a security manager is present, and the caller's class loader
789 * is not {@code null} and is not the same as or an ancestor of the
790 * class loader for the class whose class loader is requested,
791 * and the caller does not have the
792 * {@link RuntimePermission}{@code ("getClassLoader")}
793 * @see java.lang.ClassLoader
794 * @see SecurityManager#checkPermission
795 * @see java.lang.RuntimePermission
796 */
797 @CallerSensitive
798 @ForceInline // to ensure Reflection.getCallerClass optimization
799 public ClassLoader getClassLoader() {
800 ClassLoader cl = getClassLoader0();
801 if (cl == null)
802 return null;
803 SecurityManager sm = System.getSecurityManager();
804 if (sm != null) {
805 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
806 }
807 return cl;
808 }
809
810 // Package-private to allow ClassLoader access
811 ClassLoader getClassLoader0() { return classLoader; }
812
813 /**
814 * Returns the module that this class or interface is a member of.
815 *
816 * If this class represents an array type then this method returns the
817 * {@code Module} for the element type. If this class represents a
818 * primitive type or void, then the {@code Module} object for the
819 * {@code java.base} module is returned.
820 *
821 * If this class is in an unnamed module then the {@link
822 * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class
823 * loader for this class is returned.
824 *
825 * @return the module that this class or interface is a member of
826 *
827 * @since 9
828 */
829 public Module getModule() {
830 return module;
831 }
832
833 // set by VM
834 private transient Module module;
835
836 // Initialized in JVM not by private constructor
837 // This field is filtered from reflection access, i.e. getDeclaredField
838 // will throw NoSuchFieldException
839 private final ClassLoader classLoader;
840
841 /**
842 * Returns an array of {@code TypeVariable} objects that represent the
843 * type variables declared by the generic declaration represented by this
844 * {@code GenericDeclaration} object, in declaration order. Returns an
845 * array of length 0 if the underlying generic declaration declares no type
846 * variables.
847 *
848 * @return an array of {@code TypeVariable} objects that represent
849 * the type variables declared by this generic declaration
850 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
851 * signature of this generic declaration does not conform to
852 * the format specified in
853 * <cite>The Java™ Virtual Machine Specification</cite>
854 * @since 1.5
855 */
856 @SuppressWarnings("unchecked")
857 public TypeVariable<Class<T>>[] getTypeParameters() {
858 ClassRepository info = getGenericInfo();
859 if (info != null)
860 return (TypeVariable<Class<T>>[])info.getTypeParameters();
861 else
862 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
863 }
864
865
866 /**
867 * Returns the {@code Class} representing the direct superclass of the
868 * entity (class, interface, primitive type or void) represented by
869 * this {@code Class}. If this {@code Class} represents either the
870 * {@code Object} class, an interface, a primitive type, or void, then
871 * null is returned. If this object represents an array class then the
872 * {@code Class} object representing the {@code Object} class is
873 * returned.
874 *
875 * @return the direct superclass of the class represented by this object
876 */
877 @HotSpotIntrinsicCandidate
878 public native Class<? super T> getSuperclass();
879
880
881 /**
882 * Returns the {@code Type} representing the direct superclass of
883 * the entity (class, interface, primitive type or void) represented by
884 * this {@code Class}.
885 *
886 * <p>If the superclass is a parameterized type, the {@code Type}
887 * object returned must accurately reflect the actual type
888 * parameters used in the source code. The parameterized type
889 * representing the superclass is created if it had not been
890 * created before. See the declaration of {@link
891 * java.lang.reflect.ParameterizedType ParameterizedType} for the
892 * semantics of the creation process for parameterized types. If
893 * this {@code Class} represents either the {@code Object}
894 * class, an interface, a primitive type, or void, then null is
895 * returned. If this object represents an array class then the
896 * {@code Class} object representing the {@code Object} class is
897 * returned.
898 *
899 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
900 * class signature does not conform to the format specified in
901 * <cite>The Java™ Virtual Machine Specification</cite>
902 * @throws TypeNotPresentException if the generic superclass
903 * refers to a non-existent type declaration
904 * @throws java.lang.reflect.MalformedParameterizedTypeException if the
905 * generic superclass refers to a parameterized type that cannot be
906 * instantiated for any reason
907 * @return the direct superclass of the class represented by this object
908 * @since 1.5
909 */
910 public Type getGenericSuperclass() {
911 ClassRepository info = getGenericInfo();
912 if (info == null) {
913 return getSuperclass();
914 }
915
916 // Historical irregularity:
917 // Generic signature marks interfaces with superclass = Object
918 // but this API returns null for interfaces
919 if (isInterface()) {
920 return null;
921 }
922
923 return info.getSuperclass();
924 }
925
926 /**
927 * Gets the package of this class.
928 *
929 * <p>If this class represents an array type, a primitive type or void,
930 * this method returns {@code null}.
931 *
932 * @return the package of this class.
933 */
934 public Package getPackage() {
935 if (isPrimitive() || isArray()) {
936 return null;
937 }
938 ClassLoader cl = getClassLoader0();
939 return cl != null ? cl.definePackage(this)
940 : BootLoader.definePackage(this);
941 }
942
943 /**
944 * Returns the fully qualified package name.
945 *
946 * <p> If this class is a top level class, then this method returns the fully
947 * qualified name of the package that the class is a member of, or the
948 * empty string if the class is in an unnamed package.
949 *
950 * <p> If this class is a member class, then this method is equivalent to
951 * invoking {@code getPackageName()} on the {@link #getEnclosingClass
952 * enclosing class}.
953 *
954 * <p> If this class is a {@link #isLocalClass local class} or an {@link
955 * #isAnonymousClass() anonymous class}, then this method is equivalent to
956 * invoking {@code getPackageName()} on the {@link #getDeclaringClass
957 * declaring class} of the {@link #getEnclosingMethod enclosing method} or
958 * {@link #getEnclosingConstructor enclosing constructor}.
959 *
960 * <p> This method returns {@code null} if this class represents an array type,
961 * a primitive type or void.
962 *
963 * @return the fully qualified package name
964 *
965 * @since 9
966 * @jls 6.7 Fully Qualified Names
967 */
968 public String getPackageName() {
969 String pn = this.packageName;
970 if (pn == null && !isArray() && !isPrimitive()) {
971 String cn = getName();
972 int dot = cn.lastIndexOf('.');
973 pn = (dot != -1) ? cn.substring(0, dot).intern() : "";
974 this.packageName = pn;
975 }
976 return pn;
977 }
978
979 // cached package name
980 private transient String packageName;
981
982 /**
983 * Returns the interfaces directly implemented by the class or interface
984 * represented by this object.
985 *
986 * <p>If this object represents a class, the return value is an array
987 * containing objects representing all interfaces directly implemented by
988 * the class. The order of the interface objects in the array corresponds
989 * to the order of the interface names in the {@code implements} clause of
990 * the declaration of the class represented by this object. For example,
991 * given the declaration:
992 * <blockquote>
993 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
994 * </blockquote>
995 * suppose the value of {@code s} is an instance of
996 * {@code Shimmer}; the value of the expression:
997 * <blockquote>
998 * {@code s.getClass().getInterfaces()[0]}
999 * </blockquote>
1000 * is the {@code Class} object that represents interface
1001 * {@code FloorWax}; and the value of:
1002 * <blockquote>
1003 * {@code s.getClass().getInterfaces()[1]}
1004 * </blockquote>
1005 * is the {@code Class} object that represents interface
1006 * {@code DessertTopping}.
1007 *
1008 * <p>If this object represents an interface, the array contains objects
1009 * representing all interfaces directly extended by the interface. The
1010 * order of the interface objects in the array corresponds to the order of
1011 * the interface names in the {@code extends} clause of the declaration of
1012 * the interface represented by this object.
1013 *
1014 * <p>If this object represents a class or interface that implements no
1015 * interfaces, the method returns an array of length 0.
1016 *
1017 * <p>If this object represents a primitive type or void, the method
1018 * returns an array of length 0.
1019 *
1020 * <p>If this {@code Class} object represents an array type, the
1021 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1022 * returned in that order.
1023 *
1024 * @return an array of interfaces directly implemented by this class
1025 */
1026 public Class<?>[] getInterfaces() {
1027 ReflectionData<T> rd = reflectionData();
1028 if (rd == null) {
1029 // no cloning required
1030 return getInterfaces0();
1031 } else {
1032 Class<?>[] interfaces = rd.interfaces;
1033 if (interfaces == null) {
1034 interfaces = getInterfaces0();
1035 rd.interfaces = interfaces;
1036 }
1037 // defensively copy before handing over to user code
1038 return interfaces.clone();
1039 }
1040 }
1041
1042 private native Class<?>[] getInterfaces0();
1043
1044 /**
1045 * Returns the {@code Type}s representing the interfaces
1046 * directly implemented by the class or interface represented by
1047 * this object.
1048 *
1049 * <p>If a superinterface is a parameterized type, the
1050 * {@code Type} object returned for it must accurately reflect
1051 * the actual type parameters used in the source code. The
1052 * parameterized type representing each superinterface is created
1053 * if it had not been created before. See the declaration of
1054 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
1055 * for the semantics of the creation process for parameterized
1056 * types.
1057 *
1058 * <p>If this object represents a class, the return value is an array
1059 * containing objects representing all interfaces directly implemented by
1060 * the class. The order of the interface objects in the array corresponds
1061 * to the order of the interface names in the {@code implements} clause of
1062 * the declaration of the class represented by this object.
1063 *
1064 * <p>If this object represents an interface, the array contains objects
1065 * representing all interfaces directly extended by the interface. The
1066 * order of the interface objects in the array corresponds to the order of
1067 * the interface names in the {@code extends} clause of the declaration of
1068 * the interface represented by this object.
1069 *
1070 * <p>If this object represents a class or interface that implements no
1071 * interfaces, the method returns an array of length 0.
1072 *
1073 * <p>If this object represents a primitive type or void, the method
1074 * returns an array of length 0.
1075 *
1076 * <p>If this {@code Class} object represents an array type, the
1077 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1078 * returned in that order.
1079 *
1080 * @throws java.lang.reflect.GenericSignatureFormatError
1081 * if the generic class signature does not conform to the format
1082 * specified in
1083 * <cite>The Java™ Virtual Machine Specification</cite>
1084 * @throws TypeNotPresentException if any of the generic
1085 * superinterfaces refers to a non-existent type declaration
1086 * @throws java.lang.reflect.MalformedParameterizedTypeException
1087 * if any of the generic superinterfaces refer to a parameterized
1088 * type that cannot be instantiated for any reason
1089 * @return an array of interfaces directly implemented by this class
1090 * @since 1.5
1091 */
1092 public Type[] getGenericInterfaces() {
1093 ClassRepository info = getGenericInfo();
1094 return (info == null) ? getInterfaces() : info.getSuperInterfaces();
1095 }
1096
1097
1098 /**
1099 * Returns the {@code Class} representing the component type of an
1100 * array. If this class does not represent an array class this method
1101 * returns null.
1102 *
1103 * @return the {@code Class} representing the component type of this
1104 * class if this class is an array
1105 * @see java.lang.reflect.Array
1106 * @since 1.1
1107 */
1108 public Class<?> getComponentType() {
1109 // Only return for array types. Storage may be reused for Class for instance types.
1110 if (isArray()) {
1111 return componentType;
1112 } else {
1113 return null;
1114 }
1115 }
1116
1117 private final Class<?> componentType;
1118
1119
1120 /**
1121 * Returns the Java language modifiers for this class or interface, encoded
1122 * in an integer. The modifiers consist of the Java Virtual Machine's
1123 * constants for {@code public}, {@code protected},
1124 * {@code private}, {@code final}, {@code static},
1125 * {@code abstract} and {@code interface}; they should be decoded
1126 * using the methods of class {@code Modifier}.
1127 *
1128 * <p> If the underlying class is an array class, then its
1129 * {@code public}, {@code private} and {@code protected}
1130 * modifiers are the same as those of its component type. If this
1131 * {@code Class} represents a primitive type or void, its
1132 * {@code public} modifier is always {@code true}, and its
1133 * {@code protected} and {@code private} modifiers are always
1134 * {@code false}. If this object represents an array class, a
1135 * primitive type or void, then its {@code final} modifier is always
1136 * {@code true} and its interface modifier is always
1137 * {@code false}. The values of its other modifiers are not determined
1138 * by this specification.
1139 *
1140 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
1141 * Specification</em>, table 4.1.
1142 *
1143 * @return the {@code int} representing the modifiers for this class
1144 * @see java.lang.reflect.Modifier
1145 * @since 1.1
1146 */
1147 @HotSpotIntrinsicCandidate
1148 public native int getModifiers();
1149
1150
1151 /**
1152 * Gets the signers of this class.
1153 *
1154 * @return the signers of this class, or null if there are no signers. In
1155 * particular, this method returns null if this object represents
1156 * a primitive type or void.
1157 * @since 1.1
1158 */
1159 public native Object[] getSigners();
1160
1161
1162 /**
1163 * Set the signers of this class.
1164 */
1165 native void setSigners(Object[] signers);
1166
1167
1168 /**
1169 * If this {@code Class} object represents a local or anonymous
1170 * class within a method, returns a {@link
1171 * java.lang.reflect.Method Method} object representing the
1172 * immediately enclosing method of the underlying class. Returns
1173 * {@code null} otherwise.
1174 *
1175 * In particular, this method returns {@code null} if the underlying
1176 * class is a local or anonymous class immediately enclosed by a type
1177 * declaration, instance initializer or static initializer.
1178 *
1179 * @return the immediately enclosing method of the underlying class, if
1180 * that class is a local or anonymous class; otherwise {@code null}.
1181 *
1182 * @throws SecurityException
1183 * If a security manager, <i>s</i>, is present and any of the
1184 * following conditions is met:
1185 *
1186 * <ul>
1187 *
1188 * <li> the caller's class loader is not the same as the
1189 * class loader of the enclosing class and invocation of
1190 * {@link SecurityManager#checkPermission
1191 * s.checkPermission} method with
1192 * {@code RuntimePermission("accessDeclaredMembers")}
1193 * denies access to the methods within the enclosing class
1194 *
1195 * <li> the caller's class loader is not the same as or an
1196 * ancestor of the class loader for the enclosing class and
1197 * invocation of {@link SecurityManager#checkPackageAccess
1198 * s.checkPackageAccess()} denies access to the package
1199 * of the enclosing class
1200 *
1201 * </ul>
1202 * @since 1.5
1203 */
1204 @CallerSensitive
1205 public Method getEnclosingMethod() throws SecurityException {
1206 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1207
1208 if (enclosingInfo == null)
1209 return null;
1210 else {
1211 if (!enclosingInfo.isMethod())
1212 return null;
1213
1214 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
1215 getFactory());
1216 Class<?> returnType = toClass(typeInfo.getReturnType());
1217 Type [] parameterTypes = typeInfo.getParameterTypes();
1218 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1219
1220 // Convert Types to Classes; returned types *should*
1221 // be class objects since the methodDescriptor's used
1222 // don't have generics information
1223 for(int i = 0; i < parameterClasses.length; i++)
1224 parameterClasses[i] = toClass(parameterTypes[i]);
1225
1226 // Perform access check
1227 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1228 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1229 Reflection.getCallerClass(), true);
1230 // Client is ok to access declared methods but j.l.Class might not be.
1231 Method[] candidates = AccessController.doPrivileged(
1232 new PrivilegedAction<>() {
1233 @Override
1234 public Method[] run() {
1235 return enclosingCandidate.getDeclaredMethods();
1236 }
1237 });
1238 /*
1239 * Loop over all declared methods; match method name,
1240 * number of and type of parameters, *and* return
1241 * type. Matching return type is also necessary
1242 * because of covariant returns, etc.
1243 */
1244 for(Method m: candidates) {
1245 if (m.getName().equals(enclosingInfo.getName()) ) {
1246 Class<?>[] candidateParamClasses = m.getParameterTypes();
1247 if (candidateParamClasses.length == parameterClasses.length) {
1248 boolean matches = true;
1249 for(int i = 0; i < candidateParamClasses.length; i++) {
1250 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1251 matches = false;
1252 break;
1253 }
1254 }
1255
1256 if (matches) { // finally, check return type
1257 if (m.getReturnType().equals(returnType) )
1258 return m;
1259 }
1260 }
1261 }
1262 }
1263
1264 throw new InternalError("Enclosing method not found");
1265 }
1266 }
1267
1268 private native Object[] getEnclosingMethod0();
1269
1270 private EnclosingMethodInfo getEnclosingMethodInfo() {
1271 Object[] enclosingInfo = getEnclosingMethod0();
1272 if (enclosingInfo == null)
1273 return null;
1274 else {
1275 return EnclosingMethodInfo.createEnclosingInfo(enclosingInfo);
1276 }
1277 }
1278
1279 private static final class EnclosingMethodInfo {
1280 private final Class<?> enclosingClass;
1281 private final String name;
1282 private final String descriptor;
1283
1284 static void checkEnclosingInfo(Object[] enclosingInfo) {
1285 if (enclosingInfo.length != 3)
1286 throw new InternalError("Malformed enclosing method information");
1287 try {
1288 // The array is expected to have three elements:
1289
1290 // the immediately enclosing class
1291 Class<?> enclosingClass = (Class<?>) enclosingInfo[0];
1292 assert(enclosingClass != null);
1293
1294 // the immediately enclosing method or constructor's
1295 // name (can be null).
1296 String name = (String) enclosingInfo[1];
1297
1298 // the immediately enclosing method or constructor's
1299 // descriptor (null iff name is).
1300 String descriptor = (String) enclosingInfo[2];
1301 assert((name != null && descriptor != null) || name == descriptor);
1302 } catch (ClassCastException cce) {
1303 throw new InternalError("Invalid type in enclosing method information", cce);
1304 }
1305 }
1306
1307 static EnclosingMethodInfo createEnclosingInfo(Object[] enclosingInfo) {
1308 checkEnclosingInfo(enclosingInfo);
1309 return new EnclosingMethodInfo((Class<?>)enclosingInfo[0],
1310 (String)enclosingInfo[1],
1311 (String)enclosingInfo[2]);
1312 }
1313
1314 private EnclosingMethodInfo(Class<?> enclosingClass, String name,
1315 String descriptor) {
1316 this.enclosingClass = enclosingClass;
1317 this.name = name;
1318 this.descriptor = descriptor;
1319 }
1320
1321 boolean isPartial() {
1322 return enclosingClass == null || name == null || descriptor == null;
1323 }
1324
1325 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
1326
1327 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
1328
1329 Class<?> getEnclosingClass() { return enclosingClass; }
1330
1331 String getName() { return name; }
1332
1333 String getDescriptor() { return descriptor; }
1334
1335 }
1336
1337 private static Class<?> toClass(Type o) {
1338 if (o instanceof GenericArrayType)
1339 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1340 0)
1341 .getClass();
1342 return (Class<?>)o;
1343 }
1344
1345 /**
1346 * If this {@code Class} object represents a local or anonymous
1347 * class within a constructor, returns a {@link
1348 * java.lang.reflect.Constructor Constructor} object representing
1349 * the immediately enclosing constructor of the underlying
1350 * class. Returns {@code null} otherwise. In particular, this
1351 * method returns {@code null} if the underlying class is a local
1352 * or anonymous class immediately enclosed by a type declaration,
1353 * instance initializer or static initializer.
1354 *
1355 * @return the immediately enclosing constructor of the underlying class, if
1356 * that class is a local or anonymous class; otherwise {@code null}.
1357 * @throws SecurityException
1358 * If a security manager, <i>s</i>, is present and any of the
1359 * following conditions is met:
1360 *
1361 * <ul>
1362 *
1363 * <li> the caller's class loader is not the same as the
1364 * class loader of the enclosing class and invocation of
1365 * {@link SecurityManager#checkPermission
1366 * s.checkPermission} method with
1367 * {@code RuntimePermission("accessDeclaredMembers")}
1368 * denies access to the constructors within the enclosing class
1369 *
1370 * <li> the caller's class loader is not the same as or an
1371 * ancestor of the class loader for the enclosing class and
1372 * invocation of {@link SecurityManager#checkPackageAccess
1373 * s.checkPackageAccess()} denies access to the package
1374 * of the enclosing class
1375 *
1376 * </ul>
1377 * @since 1.5
1378 */
1379 @CallerSensitive
1380 public Constructor<?> getEnclosingConstructor() throws SecurityException {
1381 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1382
1383 if (enclosingInfo == null)
1384 return null;
1385 else {
1386 if (!enclosingInfo.isConstructor())
1387 return null;
1388
1389 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1390 getFactory());
1391 Type [] parameterTypes = typeInfo.getParameterTypes();
1392 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1393
1394 // Convert Types to Classes; returned types *should*
1395 // be class objects since the methodDescriptor's used
1396 // don't have generics information
1397 for(int i = 0; i < parameterClasses.length; i++)
1398 parameterClasses[i] = toClass(parameterTypes[i]);
1399
1400 // Perform access check
1401 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1402 enclosingCandidate.checkMemberAccess(Member.DECLARED,
1403 Reflection.getCallerClass(), true);
1404 // Client is ok to access declared methods but j.l.Class might not be.
1405 Constructor<?>[] candidates = AccessController.doPrivileged(
1406 new PrivilegedAction<>() {
1407 @Override
1408 public Constructor<?>[] run() {
1409 return enclosingCandidate.getDeclaredConstructors();
1410 }
1411 });
1412 /*
1413 * Loop over all declared constructors; match number
1414 * of and type of parameters.
1415 */
1416 for(Constructor<?> c: candidates) {
1417 Class<?>[] candidateParamClasses = c.getParameterTypes();
1418 if (candidateParamClasses.length == parameterClasses.length) {
1419 boolean matches = true;
1420 for(int i = 0; i < candidateParamClasses.length; i++) {
1421 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1422 matches = false;
1423 break;
1424 }
1425 }
1426
1427 if (matches)
1428 return c;
1429 }
1430 }
1431
1432 throw new InternalError("Enclosing constructor not found");
1433 }
1434 }
1435
1436
1437 /**
1438 * If the class or interface represented by this {@code Class} object
1439 * is a member of another class, returns the {@code Class} object
1440 * representing the class in which it was declared. This method returns
1441 * null if this class or interface is not a member of any other class. If
1442 * this {@code Class} object represents an array class, a primitive
1443 * type, or void,then this method returns null.
1444 *
1445 * @return the declaring class for this class
1446 * @throws SecurityException
1447 * If a security manager, <i>s</i>, is present and the caller's
1448 * class loader is not the same as or an ancestor of the class
1449 * loader for the declaring class and invocation of {@link
1450 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1451 * denies access to the package of the declaring class
1452 * @since 1.1
1453 */
1454 @CallerSensitive
1455 public Class<?> getDeclaringClass() throws SecurityException {
1456 final Class<?> candidate = getDeclaringClass0();
1457
1458 if (candidate != null)
1459 candidate.checkPackageAccess(
1460 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1461 return candidate;
1462 }
1463
1464 private native Class<?> getDeclaringClass0();
1465
1466
1467 /**
1468 * Returns the immediately enclosing class of the underlying
1469 * class. If the underlying class is a top level class this
1470 * method returns {@code null}.
1471 * @return the immediately enclosing class of the underlying class
1472 * @exception SecurityException
1473 * If a security manager, <i>s</i>, is present and the caller's
1474 * class loader is not the same as or an ancestor of the class
1475 * loader for the enclosing class and invocation of {@link
1476 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1477 * denies access to the package of the enclosing class
1478 * @since 1.5
1479 */
1480 @CallerSensitive
1481 public Class<?> getEnclosingClass() throws SecurityException {
1482 // There are five kinds of classes (or interfaces):
1483 // a) Top level classes
1484 // b) Nested classes (static member classes)
1485 // c) Inner classes (non-static member classes)
1486 // d) Local classes (named classes declared within a method)
1487 // e) Anonymous classes
1488
1489
1490 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1491 // attribute if and only if it is a local class or an
1492 // anonymous class.
1493 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1494 Class<?> enclosingCandidate;
1495
1496 if (enclosingInfo == null) {
1497 // This is a top level or a nested class or an inner class (a, b, or c)
1498 enclosingCandidate = getDeclaringClass0();
1499 } else {
1500 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1501 // This is a local class or an anonymous class (d or e)
1502 if (enclosingClass == this || enclosingClass == null)
1503 throw new InternalError("Malformed enclosing method information");
1504 else
1505 enclosingCandidate = enclosingClass;
1506 }
1507
1508 if (enclosingCandidate != null)
1509 enclosingCandidate.checkPackageAccess(
1510 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1511 return enclosingCandidate;
1512 }
1513
1514 /**
1515 * Returns the simple name of the underlying class as given in the
1516 * source code. Returns an empty string if the underlying class is
1517 * anonymous.
1518 *
1519 * <p>The simple name of an array is the simple name of the
1520 * component type with "[]" appended. In particular the simple
1521 * name of an array whose component type is anonymous is "[]".
1522 *
1523 * @return the simple name of the underlying class
1524 * @since 1.5
1525 */
1526 public String getSimpleName() {
1527 if (isArray())
1528 return getComponentType().getSimpleName()+"[]";
1529
1530 String simpleName = getSimpleBinaryName();
1531 if (simpleName == null) { // top level class
1532 simpleName = getName();
1533 return simpleName.substring(simpleName.lastIndexOf('.')+1); // strip the package name
1534 }
1535 return simpleName;
1536 }
1537
1538 /**
1539 * Return an informative string for the name of this type.
1540 *
1541 * @return an informative string for the name of this type
1542 * @since 1.8
1543 */
1544 public String getTypeName() {
1545 if (isArray()) {
1546 try {
1547 Class<?> cl = this;
1548 int dimensions = 0;
1549 while (cl.isArray()) {
1550 dimensions++;
1551 cl = cl.getComponentType();
1552 }
1553 StringBuilder sb = new StringBuilder();
1554 sb.append(cl.getName());
1555 for (int i = 0; i < dimensions; i++) {
1556 sb.append("[]");
1557 }
1558 return sb.toString();
1559 } catch (Throwable e) { /*FALLTHRU*/ }
1560 }
1561 return getName();
1562 }
1563
1564 /**
1565 * Returns the canonical name of the underlying class as
1566 * defined by the Java Language Specification. Returns null if
1567 * the underlying class does not have a canonical name (i.e., if
1568 * it is a local or anonymous class or an array whose component
1569 * type does not have a canonical name).
1570 * @return the canonical name of the underlying class if it exists, and
1571 * {@code null} otherwise.
1572 * @since 1.5
1573 */
1574 public String getCanonicalName() {
1575 if (isArray()) {
1576 String canonicalName = getComponentType().getCanonicalName();
1577 if (canonicalName != null)
1578 return canonicalName + "[]";
1579 else
1580 return null;
1581 }
1582 if (isLocalOrAnonymousClass())
1583 return null;
1584 Class<?> enclosingClass = getEnclosingClass();
1585 if (enclosingClass == null) { // top level class
1586 return getName();
1587 } else {
1588 String enclosingName = enclosingClass.getCanonicalName();
1589 if (enclosingName == null)
1590 return null;
1591 return enclosingName + "." + getSimpleName();
1592 }
1593 }
1594
1595 /**
1596 * Returns {@code true} if and only if the underlying class
1597 * is an anonymous class.
1598 *
1599 * @return {@code true} if and only if this class is an anonymous class.
1600 * @since 1.5
1601 */
1602 public boolean isAnonymousClass() {
1603 return !isArray() && isLocalOrAnonymousClass() &&
1604 getSimpleBinaryName0() == null;
1605 }
1606
1607 /**
1608 * Returns {@code true} if and only if the underlying class
1609 * is a local class.
1610 *
1611 * @return {@code true} if and only if this class is a local class.
1612 * @since 1.5
1613 */
1614 public boolean isLocalClass() {
1615 return isLocalOrAnonymousClass() &&
1616 (isArray() || getSimpleBinaryName0() != null);
1617 }
1618
1619 /**
1620 * Returns {@code true} if and only if the underlying class
1621 * is a member class.
1622 *
1623 * @return {@code true} if and only if this class is a member class.
1624 * @since 1.5
1625 */
1626 public boolean isMemberClass() {
1627 return !isLocalOrAnonymousClass() && getDeclaringClass0() != null;
1628 }
1629
1630 /**
1631 * Returns the "simple binary name" of the underlying class, i.e.,
1632 * the binary name without the leading enclosing class name.
1633 * Returns {@code null} if the underlying class is a top level
1634 * class.
1635 */
1636 private String getSimpleBinaryName() {
1637 if (isTopLevelClass())
1638 return null;
1639 String name = getSimpleBinaryName0();
1640 if (name == null) // anonymous class
1641 return "";
1642 return name;
1643 }
1644
1645 private native String getSimpleBinaryName0();
1646
1647 /**
1648 * Returns {@code true} if this is a top level class. Returns {@code false}
1649 * otherwise.
1650 */
1651 private boolean isTopLevelClass() {
1652 return !isLocalOrAnonymousClass() && getDeclaringClass0() == null;
1653 }
1654
1655 /**
1656 * Returns {@code true} if this is a local class or an anonymous
1657 * class. Returns {@code false} otherwise.
1658 */
1659 private boolean isLocalOrAnonymousClass() {
1660 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1661 // attribute if and only if it is a local class or an
1662 // anonymous class.
1663 Object[] enclosingInfo = getEnclosingMethod0();
1664 if (enclosingInfo == null) {
1665 return false;
1666 } else {
1667 EnclosingMethodInfo.checkEnclosingInfo(enclosingInfo);
1668 return true;
1669 }
1670 }
1671
1672 /**
1673 * Returns an array containing {@code Class} objects representing all
1674 * the public classes and interfaces that are members of the class
1675 * represented by this {@code Class} object. This includes public
1676 * class and interface members inherited from superclasses and public class
1677 * and interface members declared by the class. This method returns an
1678 * array of length 0 if this {@code Class} object has no public member
1679 * classes or interfaces. This method also returns an array of length 0 if
1680 * this {@code Class} object represents a primitive type, an array
1681 * class, or void.
1682 *
1683 * @return the array of {@code Class} objects representing the public
1684 * members of this class
1685 * @throws SecurityException
1686 * If a security manager, <i>s</i>, is present and
1687 * the caller's class loader is not the same as or an
1688 * ancestor of the class loader for the current class and
1689 * invocation of {@link SecurityManager#checkPackageAccess
1690 * s.checkPackageAccess()} denies access to the package
1691 * of this class.
1692 *
1693 * @since 1.1
1694 */
1695 @CallerSensitive
1696 public Class<?>[] getClasses() {
1697 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);
1698
1699 // Privileged so this implementation can look at DECLARED classes,
1700 // something the caller might not have privilege to do. The code here
1701 // is allowed to look at DECLARED classes because (1) it does not hand
1702 // out anything other than public members and (2) public member access
1703 // has already been ok'd by the SecurityManager.
1704
1705 return java.security.AccessController.doPrivileged(
1706 new java.security.PrivilegedAction<>() {
1707 public Class<?>[] run() {
1708 List<Class<?>> list = new ArrayList<>();
1709 Class<?> currentClass = Class.this;
1710 while (currentClass != null) {
1711 for (Class<?> m : currentClass.getDeclaredClasses()) {
1712 if (Modifier.isPublic(m.getModifiers())) {
1713 list.add(m);
1714 }
1715 }
1716 currentClass = currentClass.getSuperclass();
1717 }
1718 return list.toArray(new Class<?>[0]);
1719 }
1720 });
1721 }
1722
1723
1724 /**
1725 * Returns an array containing {@code Field} objects reflecting all
1726 * the accessible public fields of the class or interface represented by
1727 * this {@code Class} object.
1728 *
1729 * <p> If this {@code Class} object represents a class or interface with
1730 * no accessible public fields, then this method returns an array of length
1731 * 0.
1732 *
1733 * <p> If this {@code Class} object represents a class, then this method
1734 * returns the public fields of the class and of all its superclasses and
1735 * superinterfaces.
1736 *
1737 * <p> If this {@code Class} object represents an interface, then this
1738 * method returns the fields of the interface and of all its
1739 * superinterfaces.
1740 *
1741 * <p> If this {@code Class} object represents an array type, a primitive
1742 * type, or void, then this method returns an array of length 0.
1743 *
1744 * <p> The elements in the returned array are not sorted and are not in any
1745 * particular order.
1746 *
1747 * @return the array of {@code Field} objects representing the
1748 * public fields
1749 * @throws SecurityException
1750 * If a security manager, <i>s</i>, is present and
1751 * the caller's class loader is not the same as or an
1752 * ancestor of the class loader for the current class and
1753 * invocation of {@link SecurityManager#checkPackageAccess
1754 * s.checkPackageAccess()} denies access to the package
1755 * of this class.
1756 *
1757 * @since 1.1
1758 * @jls 8.2 Class Members
1759 * @jls 8.3 Field Declarations
1760 */
1761 @CallerSensitive
1762 public Field[] getFields() throws SecurityException {
1763 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1764 return copyFields(privateGetPublicFields(null));
1765 }
1766
1767
1768 /**
1769 * Returns an array containing {@code Method} objects reflecting all the
1770 * public methods of the class or interface represented by this {@code
1771 * Class} object, including those declared by the class or interface and
1772 * those inherited from superclasses and superinterfaces.
1773 *
1774 * <p> If this {@code Class} object represents a type that has multiple
1775 * public methods with the same name and parameter types, but different
1776 * return types, then the returned array has a {@code Method} object for
1777 * each such method.
1778 *
1779 * <p> If this {@code Class} object represents a type with a class
1780 * initialization method {@code <clinit>}, then the returned array does
1781 * <em>not</em> have a corresponding {@code Method} object.
1782 *
1783 * <p> If this {@code Class} object represents an array type, then the
1784 * returned array has a {@code Method} object for each of the public
1785 * methods inherited by the array type from {@code Object}. It does not
1786 * contain a {@code Method} object for {@code clone()}.
1787 *
1788 * <p> If this {@code Class} object represents an interface then the
1789 * returned array does not contain any implicitly declared methods from
1790 * {@code Object}. Therefore, if no methods are explicitly declared in
1791 * this interface or any of its superinterfaces then the returned array
1792 * has length 0. (Note that a {@code Class} object which represents a class
1793 * always has public methods, inherited from {@code Object}.)
1794 *
1795 * <p> If this {@code Class} object represents a primitive type or void,
1796 * then the returned array has length 0.
1797 *
1798 * <p> Static methods declared in superinterfaces of the class or interface
1799 * represented by this {@code Class} object are not considered members of
1800 * the class or interface.
1801 *
1802 * <p> The elements in the returned array are not sorted and are not in any
1803 * particular order.
1804 *
1805 * @return the array of {@code Method} objects representing the
1806 * public methods of this class
1807 * @throws SecurityException
1808 * If a security manager, <i>s</i>, is present and
1809 * the caller's class loader is not the same as or an
1810 * ancestor of the class loader for the current class and
1811 * invocation of {@link SecurityManager#checkPackageAccess
1812 * s.checkPackageAccess()} denies access to the package
1813 * of this class.
1814 *
1815 * @jls 8.2 Class Members
1816 * @jls 8.4 Method Declarations
1817 * @since 1.1
1818 */
1819 @CallerSensitive
1820 public Method[] getMethods() throws SecurityException {
1821 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1822 return copyMethods(privateGetPublicMethods());
1823 }
1824
1825
1826 /**
1827 * Returns an array containing {@code Constructor} objects reflecting
1828 * all the public constructors of the class represented by this
1829 * {@code Class} object. An array of length 0 is returned if the
1830 * class has no public constructors, or if the class is an array class, or
1831 * if the class reflects a primitive type or void.
1832 *
1833 * Note that while this method returns an array of {@code
1834 * Constructor<T>} objects (that is an array of constructors from
1835 * this class), the return type of this method is {@code
1836 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1837 * might be expected. This less informative return type is
1838 * necessary since after being returned from this method, the
1839 * array could be modified to hold {@code Constructor} objects for
1840 * different classes, which would violate the type guarantees of
1841 * {@code Constructor<T>[]}.
1842 *
1843 * @return the array of {@code Constructor} objects representing the
1844 * public constructors of this class
1845 * @throws SecurityException
1846 * If a security manager, <i>s</i>, is present and
1847 * the caller's class loader is not the same as or an
1848 * ancestor of the class loader for the current class and
1849 * invocation of {@link SecurityManager#checkPackageAccess
1850 * s.checkPackageAccess()} denies access to the package
1851 * of this class.
1852 *
1853 * @since 1.1
1854 */
1855 @CallerSensitive
1856 public Constructor<?>[] getConstructors() throws SecurityException {
1857 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1858 return copyConstructors(privateGetDeclaredConstructors(true));
1859 }
1860
1861
1862 /**
1863 * Returns a {@code Field} object that reflects the specified public member
1864 * field of the class or interface represented by this {@code Class}
1865 * object. The {@code name} parameter is a {@code String} specifying the
1866 * simple name of the desired field.
1867 *
1868 * <p> The field to be reflected is determined by the algorithm that
1869 * follows. Let C be the class or interface represented by this object:
1870 *
1871 * <OL>
1872 * <LI> If C declares a public field with the name specified, that is the
1873 * field to be reflected.</LI>
1874 * <LI> If no field was found in step 1 above, this algorithm is applied
1875 * recursively to each direct superinterface of C. The direct
1876 * superinterfaces are searched in the order they were declared.</LI>
1877 * <LI> If no field was found in steps 1 and 2 above, and C has a
1878 * superclass S, then this algorithm is invoked recursively upon S.
1879 * If C has no superclass, then a {@code NoSuchFieldException}
1880 * is thrown.</LI>
1881 * </OL>
1882 *
1883 * <p> If this {@code Class} object represents an array type, then this
1884 * method does not find the {@code length} field of the array type.
1885 *
1886 * @param name the field name
1887 * @return the {@code Field} object of this class specified by
1888 * {@code name}
1889 * @throws NoSuchFieldException if a field with the specified name is
1890 * not found.
1891 * @throws NullPointerException if {@code name} is {@code null}
1892 * @throws SecurityException
1893 * If a security manager, <i>s</i>, is present and
1894 * the caller's class loader is not the same as or an
1895 * ancestor of the class loader for the current class and
1896 * invocation of {@link SecurityManager#checkPackageAccess
1897 * s.checkPackageAccess()} denies access to the package
1898 * of this class.
1899 *
1900 * @since 1.1
1901 * @jls 8.2 Class Members
1902 * @jls 8.3 Field Declarations
1903 */
1904 @CallerSensitive
1905 public Field getField(String name)
1906 throws NoSuchFieldException, SecurityException {
1907 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1908 Field field = getField0(name);
1909 if (field == null) {
1910 throw new NoSuchFieldException(name);
1911 }
1912 return field;
1913 }
1914
1915
1916 /**
1917 * Returns a {@code Method} object that reflects the specified public
1918 * member method of the class or interface represented by this
1919 * {@code Class} object. The {@code name} parameter is a
1920 * {@code String} specifying the simple name of the desired method. The
1921 * {@code parameterTypes} parameter is an array of {@code Class}
1922 * objects that identify the method's formal parameter types, in declared
1923 * order. If {@code parameterTypes} is {@code null}, it is
1924 * treated as if it were an empty array.
1925 *
1926 * <p> If the {@code name} is "{@code <init>}" or "{@code <clinit>}" a
1927 * {@code NoSuchMethodException} is raised. Otherwise, the method to
1928 * be reflected is determined by the algorithm that follows. Let C be the
1929 * class or interface represented by this object:
1930 * <OL>
1931 * <LI> C is searched for a <I>matching method</I>, as defined below. If a
1932 * matching method is found, it is reflected.</LI>
1933 * <LI> If no matching method is found by step 1 then:
1934 * <OL TYPE="a">
1935 * <LI> If C is a class other than {@code Object}, then this algorithm is
1936 * invoked recursively on the superclass of C.</LI>
1937 * <LI> If C is the class {@code Object}, or if C is an interface, then
1938 * the superinterfaces of C (if any) are searched for a matching
1939 * method. If any such method is found, it is reflected.</LI>
1940 * </OL></LI>
1941 * </OL>
1942 *
1943 * <p> To find a matching method in a class or interface C: If C
1944 * declares exactly one public method with the specified name and exactly
1945 * the same formal parameter types, that is the method reflected. If more
1946 * than one such method is found in C, and one of these methods has a
1947 * return type that is more specific than any of the others, that method is
1948 * reflected; otherwise one of the methods is chosen arbitrarily.
1949 *
1950 * <p>Note that there may be more than one matching method in a
1951 * class because while the Java language forbids a class to
1952 * declare multiple methods with the same signature but different
1953 * return types, the Java virtual machine does not. This
1954 * increased flexibility in the virtual machine can be used to
1955 * implement various language features. For example, covariant
1956 * returns can be implemented with {@linkplain
1957 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1958 * method and the method being overridden would have the same
1959 * signature but different return types.
1960 *
1961 * <p> If this {@code Class} object represents an array type, then this
1962 * method does not find the {@code clone()} method.
1963 *
1964 * <p> Static methods declared in superinterfaces of the class or interface
1965 * represented by this {@code Class} object are not considered members of
1966 * the class or interface.
1967 *
1968 * @param name the name of the method
1969 * @param parameterTypes the list of parameters
1970 * @return the {@code Method} object that matches the specified
1971 * {@code name} and {@code parameterTypes}
1972 * @throws NoSuchMethodException if a matching method is not found
1973 * or if the name is "<init>"or "<clinit>".
1974 * @throws NullPointerException if {@code name} is {@code null}
1975 * @throws SecurityException
1976 * If a security manager, <i>s</i>, is present and
1977 * the caller's class loader is not the same as or an
1978 * ancestor of the class loader for the current class and
1979 * invocation of {@link SecurityManager#checkPackageAccess
1980 * s.checkPackageAccess()} denies access to the package
1981 * of this class.
1982 *
1983 * @jls 8.2 Class Members
1984 * @jls 8.4 Method Declarations
1985 * @since 1.1
1986 */
1987 @CallerSensitive
1988 public Method getMethod(String name, Class<?>... parameterTypes)
1989 throws NoSuchMethodException, SecurityException {
1990 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
1991 Method method = getMethod0(name, parameterTypes, true);
1992 if (method == null) {
1993 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1994 }
1995 return method;
1996 }
1997
1998 /**
1999 * Returns a {@code Method} object that reflects the specified public
2000 * member method of the class or interface represented by this
2001 * {@code Class} object.
2002 *
2003 * @param name the name of the method
2004 * @param parameterTypes the list of parameters
2005 * @return the {@code Method} object that matches the specified
2006 * {@code name} and {@code parameterTypes}; {@code null}
2007 * if the method is not found or the name is
2008 * "<init>"or "<clinit>".
2009 */
2010 Method getMethodOrNull(String name, Class<?>... parameterTypes) {
2011 return getMethod0(name, parameterTypes, true);
2012 }
2013
2014
2015 /**
2016 * Returns a {@code Constructor} object that reflects the specified
2017 * public constructor of the class represented by this {@code Class}
2018 * object. The {@code parameterTypes} parameter is an array of
2019 * {@code Class} objects that identify the constructor's formal
2020 * parameter types, in declared order.
2021 *
2022 * If this {@code Class} object represents an inner class
2023 * declared in a non-static context, the formal parameter types
2024 * include the explicit enclosing instance as the first parameter.
2025 *
2026 * <p> The constructor to reflect is the public constructor of the class
2027 * represented by this {@code Class} object whose formal parameter
2028 * types match those specified by {@code parameterTypes}.
2029 *
2030 * @param parameterTypes the parameter array
2031 * @return the {@code Constructor} object of the public constructor that
2032 * matches the specified {@code parameterTypes}
2033 * @throws NoSuchMethodException if a matching method is not found.
2034 * @throws SecurityException
2035 * If a security manager, <i>s</i>, is present and
2036 * the caller's class loader is not the same as or an
2037 * ancestor of the class loader for the current class and
2038 * invocation of {@link SecurityManager#checkPackageAccess
2039 * s.checkPackageAccess()} denies access to the package
2040 * of this class.
2041 *
2042 * @since 1.1
2043 */
2044 @CallerSensitive
2045 public Constructor<T> getConstructor(Class<?>... parameterTypes)
2046 throws NoSuchMethodException, SecurityException {
2047 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
2048 return getConstructor0(parameterTypes, Member.PUBLIC);
2049 }
2050
2051
2052 /**
2053 * Returns an array of {@code Class} objects reflecting all the
2054 * classes and interfaces declared as members of the class represented by
2055 * this {@code Class} object. This includes public, protected, default
2056 * (package) access, and private classes and interfaces declared by the
2057 * class, but excludes inherited classes and interfaces. This method
2058 * returns an array of length 0 if the class declares no classes or
2059 * interfaces as members, or if this {@code Class} object represents a
2060 * primitive type, an array class, or void.
2061 *
2062 * @return the array of {@code Class} objects representing all the
2063 * declared members of this class
2064 * @throws SecurityException
2065 * If a security manager, <i>s</i>, is present and any of the
2066 * following conditions is met:
2067 *
2068 * <ul>
2069 *
2070 * <li> the caller's class loader is not the same as the
2071 * class loader of this class and invocation of
2072 * {@link SecurityManager#checkPermission
2073 * s.checkPermission} method with
2074 * {@code RuntimePermission("accessDeclaredMembers")}
2075 * denies access to the declared classes within this class
2076 *
2077 * <li> the caller's class loader is not the same as or an
2078 * ancestor of the class loader for the current class and
2079 * invocation of {@link SecurityManager#checkPackageAccess
2080 * s.checkPackageAccess()} denies access to the package
2081 * of this class
2082 *
2083 * </ul>
2084 *
2085 * @since 1.1
2086 */
2087 @CallerSensitive
2088 public Class<?>[] getDeclaredClasses() throws SecurityException {
2089 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), false);
2090 return getDeclaredClasses0();
2091 }
2092
2093
2094 /**
2095 * Returns an array of {@code Field} objects reflecting all the fields
2096 * declared by the class or interface represented by this
2097 * {@code Class} object. This includes public, protected, default
2098 * (package) access, and private fields, but excludes inherited fields.
2099 *
2100 * <p> If this {@code Class} object represents a class or interface with no
2101 * declared fields, then this method returns an array of length 0.
2102 *
2103 * <p> If this {@code Class} object represents an array type, a primitive
2104 * type, or void, then this method returns an array of length 0.
2105 *
2106 * <p> The elements in the returned array are not sorted and are not in any
2107 * particular order.
2108 *
2109 * @return the array of {@code Field} objects representing all the
2110 * declared fields of this class
2111 * @throws SecurityException
2112 * If a security manager, <i>s</i>, is present and any of the
2113 * following conditions is met:
2114 *
2115 * <ul>
2116 *
2117 * <li> the caller's class loader is not the same as the
2118 * class loader of this class and invocation of
2119 * {@link SecurityManager#checkPermission
2120 * s.checkPermission} method with
2121 * {@code RuntimePermission("accessDeclaredMembers")}
2122 * denies access to the declared fields within this class
2123 *
2124 * <li> the caller's class loader is not the same as or an
2125 * ancestor of the class loader for the current class and
2126 * invocation of {@link SecurityManager#checkPackageAccess
2127 * s.checkPackageAccess()} denies access to the package
2128 * of this class
2129 *
2130 * </ul>
2131 *
2132 * @since 1.1
2133 * @jls 8.2 Class Members
2134 * @jls 8.3 Field Declarations
2135 */
2136 @CallerSensitive
2137 public Field[] getDeclaredFields() throws SecurityException {
2138 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2139 return copyFields(privateGetDeclaredFields(false));
2140 }
2141
2142
2143 /**
2144 *
2145 * Returns an array containing {@code Method} objects reflecting all the
2146 * declared methods of the class or interface represented by this {@code
2147 * Class} object, including public, protected, default (package)
2148 * access, and private methods, but excluding inherited methods.
2149 *
2150 * <p> If this {@code Class} object represents a type that has multiple
2151 * declared methods with the same name and parameter types, but different
2152 * return types, then the returned array has a {@code Method} object for
2153 * each such method.
2154 *
2155 * <p> If this {@code Class} object represents a type that has a class
2156 * initialization method {@code <clinit>}, then the returned array does
2157 * <em>not</em> have a corresponding {@code Method} object.
2158 *
2159 * <p> If this {@code Class} object represents a class or interface with no
2160 * declared methods, then the returned array has length 0.
2161 *
2162 * <p> If this {@code Class} object represents an array type, a primitive
2163 * type, or void, then the returned array has length 0.
2164 *
2165 * <p> The elements in the returned array are not sorted and are not in any
2166 * particular order.
2167 *
2168 * @return the array of {@code Method} objects representing all the
2169 * declared methods of this class
2170 * @throws SecurityException
2171 * If a security manager, <i>s</i>, is present and any of the
2172 * following conditions is met:
2173 *
2174 * <ul>
2175 *
2176 * <li> the caller's class loader is not the same as the
2177 * class loader of this class and invocation of
2178 * {@link SecurityManager#checkPermission
2179 * s.checkPermission} method with
2180 * {@code RuntimePermission("accessDeclaredMembers")}
2181 * denies access to the declared methods within this class
2182 *
2183 * <li> the caller's class loader is not the same as or an
2184 * ancestor of the class loader for the current class and
2185 * invocation of {@link SecurityManager#checkPackageAccess
2186 * s.checkPackageAccess()} denies access to the package
2187 * of this class
2188 *
2189 * </ul>
2190 *
2191 * @jls 8.2 Class Members
2192 * @jls 8.4 Method Declarations
2193 * @since 1.1
2194 */
2195 @CallerSensitive
2196 public Method[] getDeclaredMethods() throws SecurityException {
2197 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2198 return copyMethods(privateGetDeclaredMethods(false));
2199 }
2200
2201
2202 /**
2203 * Returns an array of {@code Constructor} objects reflecting all the
2204 * constructors declared by the class represented by this
2205 * {@code Class} object. These are public, protected, default
2206 * (package) access, and private constructors. The elements in the array
2207 * returned are not sorted and are not in any particular order. If the
2208 * class has a default constructor, it is included in the returned array.
2209 * This method returns an array of length 0 if this {@code Class}
2210 * object represents an interface, a primitive type, an array class, or
2211 * void.
2212 *
2213 * <p> See <em>The Java Language Specification</em>, section 8.2.
2214 *
2215 * @return the array of {@code Constructor} objects representing all the
2216 * declared constructors of this class
2217 * @throws SecurityException
2218 * If a security manager, <i>s</i>, is present and any of the
2219 * following conditions is met:
2220 *
2221 * <ul>
2222 *
2223 * <li> the caller's class loader is not the same as the
2224 * class loader of this class and invocation of
2225 * {@link SecurityManager#checkPermission
2226 * s.checkPermission} method with
2227 * {@code RuntimePermission("accessDeclaredMembers")}
2228 * denies access to the declared constructors within this class
2229 *
2230 * <li> the caller's class loader is not the same as or an
2231 * ancestor of the class loader for the current class and
2232 * invocation of {@link SecurityManager#checkPackageAccess
2233 * s.checkPackageAccess()} denies access to the package
2234 * of this class
2235 *
2236 * </ul>
2237 *
2238 * @since 1.1
2239 */
2240 @CallerSensitive
2241 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
2242 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2243 return copyConstructors(privateGetDeclaredConstructors(false));
2244 }
2245
2246
2247 /**
2248 * Returns a {@code Field} object that reflects the specified declared
2249 * field of the class or interface represented by this {@code Class}
2250 * object. The {@code name} parameter is a {@code String} that specifies
2251 * the simple name of the desired field.
2252 *
2253 * <p> If this {@code Class} object represents an array type, then this
2254 * method does not find the {@code length} field of the array type.
2255 *
2256 * @param name the name of the field
2257 * @return the {@code Field} object for the specified field in this
2258 * class
2259 * @throws NoSuchFieldException if a field with the specified name is
2260 * not found.
2261 * @throws NullPointerException if {@code name} is {@code null}
2262 * @throws SecurityException
2263 * If a security manager, <i>s</i>, is present and any of the
2264 * following conditions is met:
2265 *
2266 * <ul>
2267 *
2268 * <li> the caller's class loader is not the same as the
2269 * class loader of this class and invocation of
2270 * {@link SecurityManager#checkPermission
2271 * s.checkPermission} method with
2272 * {@code RuntimePermission("accessDeclaredMembers")}
2273 * denies access to the declared field
2274 *
2275 * <li> the caller's class loader is not the same as or an
2276 * ancestor of the class loader for the current class and
2277 * invocation of {@link SecurityManager#checkPackageAccess
2278 * s.checkPackageAccess()} denies access to the package
2279 * of this class
2280 *
2281 * </ul>
2282 *
2283 * @since 1.1
2284 * @jls 8.2 Class Members
2285 * @jls 8.3 Field Declarations
2286 */
2287 @CallerSensitive
2288 public Field getDeclaredField(String name)
2289 throws NoSuchFieldException, SecurityException {
2290 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2291 Field field = searchFields(privateGetDeclaredFields(false), name);
2292 if (field == null) {
2293 throw new NoSuchFieldException(name);
2294 }
2295 return field;
2296 }
2297
2298
2299 /**
2300 * Returns a {@code Method} object that reflects the specified
2301 * declared method of the class or interface represented by this
2302 * {@code Class} object. The {@code name} parameter is a
2303 * {@code String} that specifies the simple name of the desired
2304 * method, and the {@code parameterTypes} parameter is an array of
2305 * {@code Class} objects that identify the method's formal parameter
2306 * types, in declared order. If more than one method with the same
2307 * parameter types is declared in a class, and one of these methods has a
2308 * return type that is more specific than any of the others, that method is
2309 * returned; otherwise one of the methods is chosen arbitrarily. If the
2310 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
2311 * is raised.
2312 *
2313 * <p> If this {@code Class} object represents an array type, then this
2314 * method does not find the {@code clone()} method.
2315 *
2316 * @param name the name of the method
2317 * @param parameterTypes the parameter array
2318 * @return the {@code Method} object for the method of this class
2319 * matching the specified name and parameters
2320 * @throws NoSuchMethodException if a matching method is not found.
2321 * @throws NullPointerException if {@code name} is {@code null}
2322 * @throws SecurityException
2323 * If a security manager, <i>s</i>, is present and any of the
2324 * following conditions is met:
2325 *
2326 * <ul>
2327 *
2328 * <li> the caller's class loader is not the same as the
2329 * class loader of this class and invocation of
2330 * {@link SecurityManager#checkPermission
2331 * s.checkPermission} method with
2332 * {@code RuntimePermission("accessDeclaredMembers")}
2333 * denies access to the declared method
2334 *
2335 * <li> the caller's class loader is not the same as or an
2336 * ancestor of the class loader for the current class and
2337 * invocation of {@link SecurityManager#checkPackageAccess
2338 * s.checkPackageAccess()} denies access to the package
2339 * of this class
2340 *
2341 * </ul>
2342 *
2343 * @jls 8.2 Class Members
2344 * @jls 8.4 Method Declarations
2345 * @since 1.1
2346 */
2347 @CallerSensitive
2348 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
2349 throws NoSuchMethodException, SecurityException {
2350 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2351 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
2352 if (method == null) {
2353 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
2354 }
2355 return method;
2356 }
2357
2358
2359 /**
2360 * Returns a {@code Constructor} object that reflects the specified
2361 * constructor of the class or interface represented by this
2362 * {@code Class} object. The {@code parameterTypes} parameter is
2363 * an array of {@code Class} objects that identify the constructor's
2364 * formal parameter types, in declared order.
2365 *
2366 * If this {@code Class} object represents an inner class
2367 * declared in a non-static context, the formal parameter types
2368 * include the explicit enclosing instance as the first parameter.
2369 *
2370 * @param parameterTypes the parameter array
2371 * @return The {@code Constructor} object for the constructor with the
2372 * specified parameter list
2373 * @throws NoSuchMethodException if a matching method is not found.
2374 * @throws SecurityException
2375 * If a security manager, <i>s</i>, is present and any of the
2376 * following conditions is met:
2377 *
2378 * <ul>
2379 *
2380 * <li> the caller's class loader is not the same as the
2381 * class loader of this class and invocation of
2382 * {@link SecurityManager#checkPermission
2383 * s.checkPermission} method with
2384 * {@code RuntimePermission("accessDeclaredMembers")}
2385 * denies access to the declared constructor
2386 *
2387 * <li> the caller's class loader is not the same as or an
2388 * ancestor of the class loader for the current class and
2389 * invocation of {@link SecurityManager#checkPackageAccess
2390 * s.checkPackageAccess()} denies access to the package
2391 * of this class
2392 *
2393 * </ul>
2394 *
2395 * @since 1.1
2396 */
2397 @CallerSensitive
2398 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
2399 throws NoSuchMethodException, SecurityException {
2400 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
2401 return getConstructor0(parameterTypes, Member.DECLARED);
2402 }
2403
2404 /**
2405 * Finds a resource with a given name.
2406 *
2407 * <p> If this class is in a named {@link Module Module} then this method
2408 * will attempt to find the resource in the module by means of the absolute
2409 * resource name, subject to the rules for encapsulation specified in the
2410 * {@code Module} {@link Module#getResourceAsStream getResourceAsStream}
2411 * method.
2412 *
2413 * <p> Otherwise, if this class is not in a named module then the rules for
2414 * searching resources associated with a given class are implemented by the
2415 * defining {@linkplain ClassLoader class loader} of the class. This method
2416 * delegates to this object's class loader. If this object was loaded by
2417 * the bootstrap class loader, the method delegates to {@link
2418 * ClassLoader#getSystemResourceAsStream}.
2419 *
2420 * <p> Before finding a resource in the caller's module or delegation to a
2421 * class loader, an absolute resource name is constructed from the given
2422 * resource name using this algorithm:
2423 *
2424 * <ul>
2425 *
2426 * <li> If the {@code name} begins with a {@code '/'}
2427 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2428 * portion of the {@code name} following the {@code '/'}.
2429 *
2430 * <li> Otherwise, the absolute name is of the following form:
2431 *
2432 * <blockquote>
2433 * {@code modified_package_name/name}
2434 * </blockquote>
2435 *
2436 * <p> Where the {@code modified_package_name} is the package name of this
2437 * object with {@code '/'} substituted for {@code '.'}
2438 * (<tt>'\u002e'</tt>).
2439 *
2440 * </ul>
2441 *
2442 * @param name name of the desired resource
2443 * @return A {@link java.io.InputStream} object; {@code null} if no
2444 * resource with this name is found, the resource is in a package
2445 * that is not {@link Module#isOpen(String, Module) open} to at
2446 * least the caller module, or access to the resource is denied
2447 * by the security manager.
2448 * @throws NullPointerException If {@code name} is {@code null}
2449 * @since 1.1
2450 */
2451 @CallerSensitive
2452 public InputStream getResourceAsStream(String name) {
2453 name = resolveName(name);
2454
2455 Module module = getModule();
2456 if (module.isNamed()) {
2457 if (!ResourceHelper.isSimpleResource(name)) {
2458 Module caller = Reflection.getCallerClass().getModule();
2459 if (caller != module) {
2460 Set<String> packages = module.getDescriptor().packages();
2461 String pn = ResourceHelper.getPackageName(name);
2462 if (packages.contains(pn) && !module.isOpen(pn, caller)) {
2463 // resource is in package not open to caller
2464 return null;
2465 }
2466 }
2467 }
2468
2469 String mn = module.getName();
2470 ClassLoader cl = getClassLoader0();
2471 try {
2472
2473 // special-case built-in class loaders to avoid the
2474 // need for a URL connection
2475 if (cl == null) {
2476 return BootLoader.findResourceAsStream(mn, name);
2477 } else if (cl instanceof BuiltinClassLoader) {
2478 return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name);
2479 } else {
2480 URL url = cl.findResource(mn, name);
2481 return (url != null) ? url.openStream() : null;
2482 }
2483
2484 } catch (IOException | SecurityException e) {
2485 return null;
2486 }
2487 }
2488
2489 // unnamed module
2490 ClassLoader cl = getClassLoader0();
2491 if (cl == null) {
2492 return ClassLoader.getSystemResourceAsStream(name);
2493 } else {
2494 return cl.getResourceAsStream(name);
2495 }
2496 }
2497
2498 /**
2499 * Finds a resource with a given name.
2500 *
2501 * <p> If this class is in a named {@link Module Module} then this method
2502 * will attempt to find the resource in the module by means of the absolute
2503 * resource name, subject to the rules for encapsulation specified in the
2504 * {@code Module} {@link Module#getResourceAsStream getResourceAsStream}
2505 * method.
2506 *
2507 * <p> Otherwise, if this class is not in a named module then the rules for
2508 * searching resources associated with a given class are implemented by the
2509 * defining {@linkplain ClassLoader class loader} of the class. This method
2510 * delegates to this object's class loader. If this object was loaded by
2511 * the bootstrap class loader, the method delegates to {@link
2512 * ClassLoader#getSystemResource}.
2513 *
2514 * <p> Before delegation, an absolute resource name is constructed from the
2515 * given resource name using this algorithm:
2516 *
2517 * <ul>
2518 *
2519 * <li> If the {@code name} begins with a {@code '/'}
2520 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2521 * portion of the {@code name} following the {@code '/'}.
2522 *
2523 * <li> Otherwise, the absolute name is of the following form:
2524 *
2525 * <blockquote>
2526 * {@code modified_package_name/name}
2527 * </blockquote>
2528 *
2529 * <p> Where the {@code modified_package_name} is the package name of this
2530 * object with {@code '/'} substituted for {@code '.'}
2531 * (<tt>'\u002e'</tt>).
2532 *
2533 * </ul>
2534 *
2535 * @param name name of the desired resource
2536 * @return A {@link java.net.URL} object; {@code null} if no resource with
2537 * this name is found, the resource cannot be located by a URL, the
2538 * resource is in a package that is not
2539 * {@link Module#isOpen(String, Module) open} to at least the caller
2540 * module, or access to the resource is denied by the security
2541 * manager.
2542 * @throws NullPointerException If {@code name} is {@code null}
2543 * @since 1.1
2544 */
2545 @CallerSensitive
2546 public URL getResource(String name) {
2547 name = resolveName(name);
2548
2549 Module module = getModule();
2550 if (module.isNamed()) {
2551 if (!ResourceHelper.isSimpleResource(name)) {
2552 Module caller = Reflection.getCallerClass().getModule();
2553 if (caller != module) {
2554 Set<String> packages = module.getDescriptor().packages();
2555 String pn = ResourceHelper.getPackageName(name);
2556 if (packages.contains(pn) && !module.isOpen(pn, caller)) {
2557 // resource is in package not open to caller
2558 return null;
2559 }
2560 }
2561 }
2562 String mn = getModule().getName();
2563 ClassLoader cl = getClassLoader0();
2564 try {
2565 if (cl == null) {
2566 return BootLoader.findResource(mn, name);
2567 } else {
2568 return cl.findResource(mn, name);
2569 }
2570 } catch (IOException ioe) {
2571 return null;
2572 }
2573 }
2574
2575 // unnamed module
2576 ClassLoader cl = getClassLoader0();
2577 if (cl == null) {
2578 return ClassLoader.getSystemResource(name);
2579 } else {
2580 return cl.getResource(name);
2581 }
2582 }
2583
2584 /** protection domain returned when the internal domain is null */
2585 private static java.security.ProtectionDomain allPermDomain;
2586
2587
2588 /**
2589 * Returns the {@code ProtectionDomain} of this class. If there is a
2590 * security manager installed, this method first calls the security
2591 * manager's {@code checkPermission} method with a
2592 * {@code RuntimePermission("getProtectionDomain")} permission to
2593 * ensure it's ok to get the
2594 * {@code ProtectionDomain}.
2595 *
2596 * @return the ProtectionDomain of this class
2597 *
2598 * @throws SecurityException
2599 * if a security manager exists and its
2600 * {@code checkPermission} method doesn't allow
2601 * getting the ProtectionDomain.
2602 *
2603 * @see java.security.ProtectionDomain
2604 * @see SecurityManager#checkPermission
2605 * @see java.lang.RuntimePermission
2606 * @since 1.2
2607 */
2608 public java.security.ProtectionDomain getProtectionDomain() {
2609 SecurityManager sm = System.getSecurityManager();
2610 if (sm != null) {
2611 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2612 }
2613 java.security.ProtectionDomain pd = getProtectionDomain0();
2614 if (pd == null) {
2615 if (allPermDomain == null) {
2616 java.security.Permissions perms =
2617 new java.security.Permissions();
2618 perms.add(SecurityConstants.ALL_PERMISSION);
2619 allPermDomain =
2620 new java.security.ProtectionDomain(null, perms);
2621 }
2622 pd = allPermDomain;
2623 }
2624 return pd;
2625 }
2626
2627
2628 /**
2629 * Returns the ProtectionDomain of this class.
2630 */
2631 private native java.security.ProtectionDomain getProtectionDomain0();
2632
2633 /*
2634 * Return the Virtual Machine's Class object for the named
2635 * primitive type.
2636 */
2637 static native Class<?> getPrimitiveClass(String name);
2638
2639 /*
2640 * Check if client is allowed to access members. If access is denied,
2641 * throw a SecurityException.
2642 *
2643 * This method also enforces package access.
2644 *
2645 * <p> Default policy: allow all clients access with normal Java access
2646 * control.
2647 */
2648 private void checkMemberAccess(int which, Class<?> caller, boolean checkProxyInterfaces) {
2649 final SecurityManager s = System.getSecurityManager();
2650 if (s != null) {
2651 /* Default policy allows access to all {@link Member#PUBLIC} members,
2652 * as well as access to classes that have the same class loader as the caller.
2653 * In all other cases, it requires RuntimePermission("accessDeclaredMembers")
2654 * permission.
2655 */
2656 final ClassLoader ccl = ClassLoader.getClassLoader(caller);
2657 final ClassLoader cl = getClassLoader0();
2658 if (which != Member.PUBLIC) {
2659 if (ccl != cl) {
2660 s.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
2661 }
2662 }
2663 this.checkPackageAccess(ccl, checkProxyInterfaces);
2664 }
2665 }
2666
2667 /*
2668 * Checks if a client loaded in ClassLoader ccl is allowed to access this
2669 * class under the current package access policy. If access is denied,
2670 * throw a SecurityException.
2671 */
2672 private void checkPackageAccess(final ClassLoader ccl, boolean checkProxyInterfaces) {
2673 final SecurityManager s = System.getSecurityManager();
2674 if (s != null) {
2675 final ClassLoader cl = getClassLoader0();
2676
2677 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2678 String name = this.getName();
2679 int i = name.lastIndexOf('.');
2680 if (i != -1) {
2681 // skip the package access check on a proxy class in default proxy package
2682 String pkg = name.substring(0, i);
2683 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
2684 s.checkPackageAccess(pkg);
2685 }
2686 }
2687 }
2688 // check package access on the proxy interfaces
2689 if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
2690 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
2691 }
2692 }
2693 }
2694
2695 /**
2696 * Add a package name prefix if the name is not absolute Remove leading "/"
2697 * if name is absolute
2698 */
2699 private String resolveName(String name) {
2700 if (!name.startsWith("/")) {
2701 Class<?> c = this;
2702 while (c.isArray()) {
2703 c = c.getComponentType();
2704 }
2705 String baseName = c.getName();
2706 int index = baseName.lastIndexOf('.');
2707 if (index != -1) {
2708 name = baseName.substring(0, index).replace('.', '/')
2709 +"/"+name;
2710 }
2711 } else {
2712 name = name.substring(1);
2713 }
2714 return name;
2715 }
2716
2717 /**
2718 * Atomic operations support.
2719 */
2720 private static class Atomic {
2721 // initialize Unsafe machinery here, since we need to call Class.class instance method
2722 // and have to avoid calling it in the static initializer of the Class class...
2723 private static final Unsafe unsafe = Unsafe.getUnsafe();
2724 // offset of Class.reflectionData instance field
2725 private static final long reflectionDataOffset;
2726 // offset of Class.annotationType instance field
2727 private static final long annotationTypeOffset;
2728 // offset of Class.annotationData instance field
2729 private static final long annotationDataOffset;
2730
2731 static {
2732 Field[] fields = Class.class.getDeclaredFields0(false); // bypass caches
2733 reflectionDataOffset = objectFieldOffset(fields, "reflectionData");
2734 annotationTypeOffset = objectFieldOffset(fields, "annotationType");
2735 annotationDataOffset = objectFieldOffset(fields, "annotationData");
2736 }
2737
2738 private static long objectFieldOffset(Field[] fields, String fieldName) {
2739 Field field = searchFields(fields, fieldName);
2740 if (field == null) {
2741 throw new Error("No " + fieldName + " field found in java.lang.Class");
2742 }
2743 return unsafe.objectFieldOffset(field);
2744 }
2745
2746 static <T> boolean casReflectionData(Class<?> clazz,
2747 SoftReference<ReflectionData<T>> oldData,
2748 SoftReference<ReflectionData<T>> newData) {
2749 return unsafe.compareAndSwapObject(clazz, reflectionDataOffset, oldData, newData);
2750 }
2751
2752 static <T> boolean casAnnotationType(Class<?> clazz,
2753 AnnotationType oldType,
2754 AnnotationType newType) {
2755 return unsafe.compareAndSwapObject(clazz, annotationTypeOffset, oldType, newType);
2756 }
2757
2758 static <T> boolean casAnnotationData(Class<?> clazz,
2759 AnnotationData oldData,
2760 AnnotationData newData) {
2761 return unsafe.compareAndSwapObject(clazz, annotationDataOffset, oldData, newData);
2762 }
2763 }
2764
2765 /**
2766 * Reflection support.
2767 */
2768
2769 // reflection data that might get invalidated when JVM TI RedefineClasses() is called
2770 private static class ReflectionData<T> {
2771 volatile Field[] declaredFields;
2772 volatile Field[] publicFields;
2773 volatile Method[] declaredMethods;
2774 volatile Method[] publicMethods;
2775 volatile Constructor<T>[] declaredConstructors;
2776 volatile Constructor<T>[] publicConstructors;
2777 // Intermediate results for getFields and getMethods
2778 volatile Field[] declaredPublicFields;
2779 volatile Method[] declaredPublicMethods;
2780 volatile Class<?>[] interfaces;
2781
2782 // Value of classRedefinedCount when we created this ReflectionData instance
2783 final int redefinedCount;
2784
2785 ReflectionData(int redefinedCount) {
2786 this.redefinedCount = redefinedCount;
2787 }
2788 }
2789
2790 private transient volatile SoftReference<ReflectionData<T>> reflectionData;
2791
2792 // Incremented by the VM on each call to JVM TI RedefineClasses()
2793 // that redefines this class or a superclass.
2794 private transient volatile int classRedefinedCount;
2795
2796 // Lazily create and cache ReflectionData
2797 private ReflectionData<T> reflectionData() {
2798 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
2799 int classRedefinedCount = this.classRedefinedCount;
2800 ReflectionData<T> rd;
2801 if (reflectionData != null &&
2802 (rd = reflectionData.get()) != null &&
2803 rd.redefinedCount == classRedefinedCount) {
2804 return rd;
2805 }
2806 // else no SoftReference or cleared SoftReference or stale ReflectionData
2807 // -> create and replace new instance
2808 return newReflectionData(reflectionData, classRedefinedCount);
2809 }
2810
2811 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
2812 int classRedefinedCount) {
2813 while (true) {
2814 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
2815 // try to CAS it...
2816 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
2817 return rd;
2818 }
2819 // else retry
2820 oldReflectionData = this.reflectionData;
2821 classRedefinedCount = this.classRedefinedCount;
2822 if (oldReflectionData != null &&
2823 (rd = oldReflectionData.get()) != null &&
2824 rd.redefinedCount == classRedefinedCount) {
2825 return rd;
2826 }
2827 }
2828 }
2829
2830 // Generic signature handling
2831 private native String getGenericSignature0();
2832
2833 // Generic info repository; lazily initialized
2834 private transient volatile ClassRepository genericInfo;
2835
2836 // accessor for factory
2837 private GenericsFactory getFactory() {
2838 // create scope and factory
2839 return CoreReflectionFactory.make(this, ClassScope.make(this));
2840 }
2841
2842 // accessor for generic info repository;
2843 // generic info is lazily initialized
2844 private ClassRepository getGenericInfo() {
2845 ClassRepository genericInfo = this.genericInfo;
2846 if (genericInfo == null) {
2847 String signature = getGenericSignature0();
2848 if (signature == null) {
2849 genericInfo = ClassRepository.NONE;
2850 } else {
2851 genericInfo = ClassRepository.make(signature, getFactory());
2852 }
2853 this.genericInfo = genericInfo;
2854 }
2855 return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
2856 }
2857
2858 // Annotations handling
2859 native byte[] getRawAnnotations();
2860 // Since 1.8
2861 native byte[] getRawTypeAnnotations();
2862 static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
2863 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
2864 }
2865
2866 native ConstantPool getConstantPool();
2867
2868 //
2869 //
2870 // java.lang.reflect.Field handling
2871 //
2872 //
2873
2874 // Returns an array of "root" fields. These Field objects must NOT
2875 // be propagated to the outside world, but must instead be copied
2876 // via ReflectionFactory.copyField.
2877 private Field[] privateGetDeclaredFields(boolean publicOnly) {
2878 Field[] res;
2879 ReflectionData<T> rd = reflectionData();
2880 if (rd != null) {
2881 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
2882 if (res != null) return res;
2883 }
2884 // No cached value available; request value from VM
2885 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
2886 if (rd != null) {
2887 if (publicOnly) {
2888 rd.declaredPublicFields = res;
2889 } else {
2890 rd.declaredFields = res;
2891 }
2892 }
2893 return res;
2894 }
2895
2896 // Returns an array of "root" fields. These Field objects must NOT
2897 // be propagated to the outside world, but must instead be copied
2898 // via ReflectionFactory.copyField.
2899 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) {
2900 Field[] res;
2901 ReflectionData<T> rd = reflectionData();
2902 if (rd != null) {
2903 res = rd.publicFields;
2904 if (res != null) return res;
2905 }
2906
2907 // No cached value available; compute value recursively.
2908 // Traverse in correct order for getField().
2909 List<Field> fields = new ArrayList<>();
2910 if (traversedInterfaces == null) {
2911 traversedInterfaces = new HashSet<>();
2912 }
2913
2914 // Local fields
2915 Field[] tmp = privateGetDeclaredFields(true);
2916 addAll(fields, tmp);
2917
2918 // Direct superinterfaces, recursively
2919 for (Class<?> c : getInterfaces()) {
2920 if (!traversedInterfaces.contains(c)) {
2921 traversedInterfaces.add(c);
2922 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2923 }
2924 }
2925
2926 // Direct superclass, recursively
2927 if (!isInterface()) {
2928 Class<?> c = getSuperclass();
2929 if (c != null) {
2930 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2931 }
2932 }
2933
2934 res = new Field[fields.size()];
2935 fields.toArray(res);
2936 if (rd != null) {
2937 rd.publicFields = res;
2938 }
2939 return res;
2940 }
2941
2942 private static void addAll(Collection<Field> c, Field[] o) {
2943 for (Field f : o) {
2944 c.add(f);
2945 }
2946 }
2947
2948
2949 //
2950 //
2951 // java.lang.reflect.Constructor handling
2952 //
2953 //
2954
2955 // Returns an array of "root" constructors. These Constructor
2956 // objects must NOT be propagated to the outside world, but must
2957 // instead be copied via ReflectionFactory.copyConstructor.
2958 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
2959 Constructor<T>[] res;
2960 ReflectionData<T> rd = reflectionData();
2961 if (rd != null) {
2962 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
2963 if (res != null) return res;
2964 }
2965 // No cached value available; request value from VM
2966 if (isInterface()) {
2967 @SuppressWarnings("unchecked")
2968 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
2969 res = temporaryRes;
2970 } else {
2971 res = getDeclaredConstructors0(publicOnly);
2972 }
2973 if (rd != null) {
2974 if (publicOnly) {
2975 rd.publicConstructors = res;
2976 } else {
2977 rd.declaredConstructors = res;
2978 }
2979 }
2980 return res;
2981 }
2982
2983 //
2984 //
2985 // java.lang.reflect.Method handling
2986 //
2987 //
2988
2989 // Returns an array of "root" methods. These Method objects must NOT
2990 // be propagated to the outside world, but must instead be copied
2991 // via ReflectionFactory.copyMethod.
2992 private Method[] privateGetDeclaredMethods(boolean publicOnly) {
2993 Method[] res;
2994 ReflectionData<T> rd = reflectionData();
2995 if (rd != null) {
2996 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
2997 if (res != null) return res;
2998 }
2999 // No cached value available; request value from VM
3000 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
3001 if (rd != null) {
3002 if (publicOnly) {
3003 rd.declaredPublicMethods = res;
3004 } else {
3005 rd.declaredMethods = res;
3006 }
3007 }
3008 return res;
3009 }
3010
3011 static class MethodArray {
3012 // Don't add or remove methods except by add() or remove() calls.
3013 private Method[] methods;
3014 private int length;
3015 private int defaults;
3016
3017 MethodArray() {
3018 this(20);
3019 }
3020
3021 MethodArray(int initialSize) {
3022 if (initialSize < 2)
3023 throw new IllegalArgumentException("Size should be 2 or more");
3024
3025 methods = new Method[initialSize];
3026 length = 0;
3027 defaults = 0;
3028 }
3029
3030 boolean hasDefaults() {
3031 return defaults != 0;
3032 }
3033
3034 void add(Method m) {
3035 if (length == methods.length) {
3036 methods = Arrays.copyOf(methods, 2 * methods.length);
3037 }
3038 methods[length++] = m;
3039
3040 if (m != null && m.isDefault())
3041 defaults++;
3042 }
3043
3044 void addAll(Method[] ma) {
3045 for (Method m : ma) {
3046 add(m);
3047 }
3048 }
3049
3050 void addAll(MethodArray ma) {
3051 for (int i = 0; i < ma.length(); i++) {
3052 add(ma.get(i));
3053 }
3054 }
3055
3056 void addIfNotPresent(Method newMethod) {
3057 for (int i = 0; i < length; i++) {
3058 Method m = methods[i];
3059 if (m == newMethod || (m != null && m.equals(newMethod))) {
3060 return;
3061 }
3062 }
3063 add(newMethod);
3064 }
3065
3066 void addAllIfNotPresent(MethodArray newMethods) {
3067 for (int i = 0; i < newMethods.length(); i++) {
3068 Method m = newMethods.get(i);
3069 if (m != null) {
3070 addIfNotPresent(m);
3071 }
3072 }
3073 }
3074
3075 /* Add Methods declared in an interface to this MethodArray.
3076 * Static methods declared in interfaces are not inherited.
3077 */
3078 void addInterfaceMethods(Method[] methods) {
3079 for (Method candidate : methods) {
3080 if (!Modifier.isStatic(candidate.getModifiers())) {
3081 add(candidate);
3082 }
3083 }
3084 }
3085
3086 int length() {
3087 return length;
3088 }
3089
3090 Method get(int i) {
3091 return methods[i];
3092 }
3093
3094 Method getFirst() {
3095 for (Method m : methods)
3096 if (m != null)
3097 return m;
3098 return null;
3099 }
3100
3101 void removeByNameAndDescriptor(Method toRemove) {
3102 for (int i = 0; i < length; i++) {
3103 Method m = methods[i];
3104 if (m != null && matchesNameAndDescriptor(m, toRemove)) {
3105 remove(i);
3106 }
3107 }
3108 }
3109
3110 private void remove(int i) {
3111 if (methods[i] != null && methods[i].isDefault())
3112 defaults--;
3113 methods[i] = null;
3114 }
3115
3116 private boolean matchesNameAndDescriptor(Method m1, Method m2) {
3117 return m1.getReturnType() == m2.getReturnType() &&
3118 m1.getName() == m2.getName() && // name is guaranteed to be interned
3119 arrayContentsEq(m1.getParameterTypes(),
3120 m2.getParameterTypes());
3121 }
3122
3123 void compactAndTrim() {
3124 int newPos = 0;
3125 // Get rid of null slots
3126 for (int pos = 0; pos < length; pos++) {
3127 Method m = methods[pos];
3128 if (m != null) {
3129 if (pos != newPos) {
3130 methods[newPos] = m;
3131 }
3132 newPos++;
3133 }
3134 }
3135 if (newPos != methods.length) {
3136 methods = Arrays.copyOf(methods, newPos);
3137 }
3138 }
3139
3140 /* Removes all Methods from this MethodArray that have a more specific
3141 * default Method in this MethodArray.
3142 *
3143 * Users of MethodArray are responsible for pruning Methods that have
3144 * a more specific <em>concrete</em> Method.
3145 */
3146 void removeLessSpecifics() {
3147 if (!hasDefaults())
3148 return;
3149
3150 for (int i = 0; i < length; i++) {
3151 Method m = get(i);
3152 if (m == null || !m.isDefault())
3153 continue;
3154
3155 for (int j = 0; j < length; j++) {
3156 if (i == j)
3157 continue;
3158
3159 Method candidate = get(j);
3160 if (candidate == null)
3161 continue;
3162
3163 if (!matchesNameAndDescriptor(m, candidate))
3164 continue;
3165
3166 if (hasMoreSpecificClass(m, candidate))
3167 remove(j);
3168 }
3169 }
3170 }
3171
3172 Method[] getArray() {
3173 return methods;
3174 }
3175
3176 // Returns true if m1 is more specific than m2
3177 static boolean hasMoreSpecificClass(Method m1, Method m2) {
3178 Class<?> m1Class = m1.getDeclaringClass();
3179 Class<?> m2Class = m2.getDeclaringClass();
3180 return m1Class != m2Class && m2Class.isAssignableFrom(m1Class);
3181 }
3182 }
3183
3184
3185 // Returns an array of "root" methods. These Method objects must NOT
3186 // be propagated to the outside world, but must instead be copied
3187 // via ReflectionFactory.copyMethod.
3188 private Method[] privateGetPublicMethods() {
3189 Method[] res;
3190 ReflectionData<T> rd = reflectionData();
3191 if (rd != null) {
3192 res = rd.publicMethods;
3193 if (res != null) return res;
3194 }
3195
3196 // No cached value available; compute value recursively.
3197 // Start by fetching public declared methods
3198 MethodArray methods = new MethodArray();
3199 {
3200 Method[] tmp = privateGetDeclaredMethods(true);
3201 methods.addAll(tmp);
3202 }
3203 // Now recur over superclass and direct superinterfaces.
3204 // Go over superinterfaces first so we can more easily filter
3205 // out concrete implementations inherited from superclasses at
3206 // the end.
3207 MethodArray inheritedMethods = new MethodArray();
3208 for (Class<?> i : getInterfaces()) {
3209 inheritedMethods.addInterfaceMethods(i.privateGetPublicMethods());
3210 }
3211 if (!isInterface()) {
3212 Class<?> c = getSuperclass();
3213 if (c != null) {
3214 MethodArray supers = new MethodArray();
3215 supers.addAll(c.privateGetPublicMethods());
3216 // Filter out concrete implementations of any
3217 // interface methods
3218 for (int i = 0; i < supers.length(); i++) {
3219 Method m = supers.get(i);
3220 if (m != null &&
3221 !Modifier.isAbstract(m.getModifiers()) &&
3222 !m.isDefault()) {
3223 inheritedMethods.removeByNameAndDescriptor(m);
3224 }
3225 }
3226 // Insert superclass's inherited methods before
3227 // superinterfaces' to satisfy getMethod's search
3228 // order
3229 supers.addAll(inheritedMethods);
3230 inheritedMethods = supers;
3231 }
3232 }
3233 // Filter out all local methods from inherited ones
3234 for (int i = 0; i < methods.length(); i++) {
3235 Method m = methods.get(i);
3236 inheritedMethods.removeByNameAndDescriptor(m);
3237 }
3238 methods.addAllIfNotPresent(inheritedMethods);
3239 methods.removeLessSpecifics();
3240 methods.compactAndTrim();
3241 res = methods.getArray();
3242 if (rd != null) {
3243 rd.publicMethods = res;
3244 }
3245 return res;
3246 }
3247
3248
3249 //
3250 // Helpers for fetchers of one field, method, or constructor
3251 //
3252
3253 private static Field searchFields(Field[] fields, String name) {
3254 String internedName = name.intern();
3255 for (Field field : fields) {
3256 if (field.getName() == internedName) {
3257 return getReflectionFactory().copyField(field);
3258 }
3259 }
3260 return null;
3261 }
3262
3263 private Field getField0(String name) throws NoSuchFieldException {
3264 // Note: the intent is that the search algorithm this routine
3265 // uses be equivalent to the ordering imposed by
3266 // privateGetPublicFields(). It fetches only the declared
3267 // public fields for each class, however, to reduce the number
3268 // of Field objects which have to be created for the common
3269 // case where the field being requested is declared in the
3270 // class which is being queried.
3271 Field res;
3272 // Search declared public fields
3273 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
3274 return res;
3275 }
3276 // Direct superinterfaces, recursively
3277 Class<?>[] interfaces = getInterfaces();
3278 for (Class<?> c : interfaces) {
3279 if ((res = c.getField0(name)) != null) {
3280 return res;
3281 }
3282 }
3283 // Direct superclass, recursively
3284 if (!isInterface()) {
3285 Class<?> c = getSuperclass();
3286 if (c != null) {
3287 if ((res = c.getField0(name)) != null) {
3288 return res;
3289 }
3290 }
3291 }
3292 return null;
3293 }
3294
3295 private static Method searchMethods(Method[] methods,
3296 String name,
3297 Class<?>[] parameterTypes)
3298 {
3299 Method res = null;
3300 String internedName = name.intern();
3301 for (Method m : methods) {
3302 if (m.getName() == internedName
3303 && arrayContentsEq(parameterTypes, m.getParameterTypes())
3304 && (res == null
3305 || res.getReturnType().isAssignableFrom(m.getReturnType())))
3306 res = m;
3307 }
3308
3309 return (res == null ? res : getReflectionFactory().copyMethod(res));
3310 }
3311
3312 private Method getMethod0(String name, Class<?>[] parameterTypes, boolean includeStaticMethods) {
3313 MethodArray interfaceCandidates = new MethodArray(2);
3314 Method res = privateGetMethodRecursive(name, parameterTypes, includeStaticMethods, interfaceCandidates);
3315 if (res != null)
3316 return res;
3317
3318 // Not found on class or superclass directly
3319 interfaceCandidates.removeLessSpecifics();
3320 return interfaceCandidates.getFirst(); // may be null
3321 }
3322
3323 private Method privateGetMethodRecursive(String name,
3324 Class<?>[] parameterTypes,
3325 boolean includeStaticMethods,
3326 MethodArray allInterfaceCandidates) {
3327 // Note: the intent is that the search algorithm this routine
3328 // uses be equivalent to the ordering imposed by
3329 // privateGetPublicMethods(). It fetches only the declared
3330 // public methods for each class, however, to reduce the
3331 // number of Method objects which have to be created for the
3332 // common case where the method being requested is declared in
3333 // the class which is being queried.
3334 //
3335 // Due to default methods, unless a method is found on a superclass,
3336 // methods declared in any superinterface needs to be considered.
3337 // Collect all candidates declared in superinterfaces in {@code
3338 // allInterfaceCandidates} and select the most specific if no match on
3339 // a superclass is found.
3340
3341 // Must _not_ return root methods
3342 Method res;
3343 // Search declared public methods
3344 if ((res = searchMethods(privateGetDeclaredMethods(true),
3345 name,
3346 parameterTypes)) != null) {
3347 if (includeStaticMethods || !Modifier.isStatic(res.getModifiers()))
3348 return res;
3349 }
3350 // Search superclass's methods
3351 if (!isInterface()) {
3352 Class<? super T> c = getSuperclass();
3353 if (c != null) {
3354 if ((res = c.getMethod0(name, parameterTypes, true)) != null) {
3355 return res;
3356 }
3357 }
3358 }
3359 // Search superinterfaces' methods
3360 Class<?>[] interfaces = getInterfaces();
3361 for (Class<?> c : interfaces)
3362 if ((res = c.getMethod0(name, parameterTypes, false)) != null)
3363 allInterfaceCandidates.add(res);
3364 // Not found
3365 return null;
3366 }
3367
3368 private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
3369 int which) throws NoSuchMethodException
3370 {
3371 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
3372 for (Constructor<T> constructor : constructors) {
3373 if (arrayContentsEq(parameterTypes,
3374 constructor.getParameterTypes())) {
3375 return getReflectionFactory().copyConstructor(constructor);
3376 }
3377 }
3378 throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes));
3379 }
3380
3381 //
3382 // Other helpers and base implementation
3383 //
3384
3385 private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
3386 if (a1 == null) {
3387 return a2 == null || a2.length == 0;
3388 }
3389
3390 if (a2 == null) {
3391 return a1.length == 0;
3392 }
3393
3394 if (a1.length != a2.length) {
3395 return false;
3396 }
3397
3398 for (int i = 0; i < a1.length; i++) {
3399 if (a1[i] != a2[i]) {
3400 return false;
3401 }
3402 }
3403
3404 return true;
3405 }
3406
3407 private static Field[] copyFields(Field[] arg) {
3408 Field[] out = new Field[arg.length];
3409 ReflectionFactory fact = getReflectionFactory();
3410 for (int i = 0; i < arg.length; i++) {
3411 out[i] = fact.copyField(arg[i]);
3412 }
3413 return out;
3414 }
3415
3416 private static Method[] copyMethods(Method[] arg) {
3417 Method[] out = new Method[arg.length];
3418 ReflectionFactory fact = getReflectionFactory();
3419 for (int i = 0; i < arg.length; i++) {
3420 out[i] = fact.copyMethod(arg[i]);
3421 }
3422 return out;
3423 }
3424
3425 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
3426 Constructor<U>[] out = arg.clone();
3427 ReflectionFactory fact = getReflectionFactory();
3428 for (int i = 0; i < out.length; i++) {
3429 out[i] = fact.copyConstructor(out[i]);
3430 }
3431 return out;
3432 }
3433
3434 private native Field[] getDeclaredFields0(boolean publicOnly);
3435 private native Method[] getDeclaredMethods0(boolean publicOnly);
3436 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
3437 private native Class<?>[] getDeclaredClasses0();
3438
3439 private static String argumentTypesToString(Class<?>[] argTypes) {
3440 StringJoiner sj = new StringJoiner(", ", "(", ")");
3441 if (argTypes != null) {
3442 for (int i = 0; i < argTypes.length; i++) {
3443 Class<?> c = argTypes[i];
3444 sj.add((c == null) ? "null" : c.getName());
3445 }
3446 }
3447 return sj.toString();
3448 }
3449
3450 /** use serialVersionUID from JDK 1.1 for interoperability */
3451 private static final long serialVersionUID = 3206093459760846163L;
3452
3453
3454 /**
3455 * Class Class is special cased within the Serialization Stream Protocol.
3456 *
3457 * A Class instance is written initially into an ObjectOutputStream in the
3458 * following format:
3459 * <pre>
3460 * {@code TC_CLASS} ClassDescriptor
3461 * A ClassDescriptor is a special cased serialization of
3462 * a {@code java.io.ObjectStreamClass} instance.
3463 * </pre>
3464 * A new handle is generated for the initial time the class descriptor
3465 * is written into the stream. Future references to the class descriptor
3466 * are written as references to the initial class descriptor instance.
3467 *
3468 * @see java.io.ObjectStreamClass
3469 */
3470 private static final ObjectStreamField[] serialPersistentFields =
3471 new ObjectStreamField[0];
3472
3473
3474 /**
3475 * Returns the assertion status that would be assigned to this
3476 * class if it were to be initialized at the time this method is invoked.
3477 * If this class has had its assertion status set, the most recent
3478 * setting will be returned; otherwise, if any package default assertion
3479 * status pertains to this class, the most recent setting for the most
3480 * specific pertinent package default assertion status is returned;
3481 * otherwise, if this class is not a system class (i.e., it has a
3482 * class loader) its class loader's default assertion status is returned;
3483 * otherwise, the system class default assertion status is returned.
3484 * <p>
3485 * Few programmers will have any need for this method; it is provided
3486 * for the benefit of the JRE itself. (It allows a class to determine at
3487 * the time that it is initialized whether assertions should be enabled.)
3488 * Note that this method is not guaranteed to return the actual
3489 * assertion status that was (or will be) associated with the specified
3490 * class when it was (or will be) initialized.
3491 *
3492 * @return the desired assertion status of the specified class.
3493 * @see java.lang.ClassLoader#setClassAssertionStatus
3494 * @see java.lang.ClassLoader#setPackageAssertionStatus
3495 * @see java.lang.ClassLoader#setDefaultAssertionStatus
3496 * @since 1.4
3497 */
3498 public boolean desiredAssertionStatus() {
3499 ClassLoader loader = getClassLoader0();
3500 // If the loader is null this is a system class, so ask the VM
3501 if (loader == null)
3502 return desiredAssertionStatus0(this);
3503
3504 // If the classloader has been initialized with the assertion
3505 // directives, ask it. Otherwise, ask the VM.
3506 synchronized(loader.assertionLock) {
3507 if (loader.classAssertionStatus != null) {
3508 return loader.desiredAssertionStatus(getName());
3509 }
3510 }
3511 return desiredAssertionStatus0(this);
3512 }
3513
3514 // Retrieves the desired assertion status of this class from the VM
3515 private static native boolean desiredAssertionStatus0(Class<?> clazz);
3516
3517 /**
3518 * Returns true if and only if this class was declared as an enum in the
3519 * source code.
3520 *
3521 * @return true if and only if this class was declared as an enum in the
3522 * source code
3523 * @since 1.5
3524 */
3525 public boolean isEnum() {
3526 // An enum must both directly extend java.lang.Enum and have
3527 // the ENUM bit set; classes for specialized enum constants
3528 // don't do the former.
3529 return (this.getModifiers() & ENUM) != 0 &&
3530 this.getSuperclass() == java.lang.Enum.class;
3531 }
3532
3533 // Fetches the factory for reflective objects
3534 private static ReflectionFactory getReflectionFactory() {
3535 if (reflectionFactory == null) {
3536 reflectionFactory =
3537 java.security.AccessController.doPrivileged
3538 (new ReflectionFactory.GetReflectionFactoryAction());
3539 }
3540 return reflectionFactory;
3541 }
3542 private static ReflectionFactory reflectionFactory;
3543
3544 /**
3545 * Returns the elements of this enum class or null if this
3546 * Class object does not represent an enum type.
3547 *
3548 * @return an array containing the values comprising the enum class
3549 * represented by this Class object in the order they're
3550 * declared, or null if this Class object does not
3551 * represent an enum type
3552 * @since 1.5
3553 */
3554 public T[] getEnumConstants() {
3555 T[] values = getEnumConstantsShared();
3556 return (values != null) ? values.clone() : null;
3557 }
3558
3559 /**
3560 * Returns the elements of this enum class or null if this
3561 * Class object does not represent an enum type;
3562 * identical to getEnumConstants except that the result is
3563 * uncloned, cached, and shared by all callers.
3564 */
3565 T[] getEnumConstantsShared() {
3566 T[] constants = enumConstants;
3567 if (constants == null) {
3568 if (!isEnum()) return null;
3569 try {
3570 final Method values = getMethod("values");
3571 java.security.AccessController.doPrivileged(
3572 new java.security.PrivilegedAction<>() {
3573 public Void run() {
3574 values.setAccessible(true);
3575 return null;
3576 }
3577 });
3578 @SuppressWarnings("unchecked")
3579 T[] temporaryConstants = (T[])values.invoke(null);
3580 enumConstants = constants = temporaryConstants;
3581 }
3582 // These can happen when users concoct enum-like classes
3583 // that don't comply with the enum spec.
3584 catch (InvocationTargetException | NoSuchMethodException |
3585 IllegalAccessException ex) { return null; }
3586 }
3587 return constants;
3588 }
3589 private transient volatile T[] enumConstants;
3590
3591 /**
3592 * Returns a map from simple name to enum constant. This package-private
3593 * method is used internally by Enum to implement
3594 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
3595 * efficiently. Note that the map is returned by this method is
3596 * created lazily on first use. Typically it won't ever get created.
3597 */
3598 Map<String, T> enumConstantDirectory() {
3599 Map<String, T> directory = enumConstantDirectory;
3600 if (directory == null) {
3601 T[] universe = getEnumConstantsShared();
3602 if (universe == null)
3603 throw new IllegalArgumentException(
3604 getName() + " is not an enum type");
3605 directory = new HashMap<>(2 * universe.length);
3606 for (T constant : universe) {
3607 directory.put(((Enum<?>)constant).name(), constant);
3608 }
3609 enumConstantDirectory = directory;
3610 }
3611 return directory;
3612 }
3613 private transient volatile Map<String, T> enumConstantDirectory;
3614
3615 /**
3616 * Casts an object to the class or interface represented
3617 * by this {@code Class} object.
3618 *
3619 * @param obj the object to be cast
3620 * @return the object after casting, or null if obj is null
3621 *
3622 * @throws ClassCastException if the object is not
3623 * null and is not assignable to the type T.
3624 *
3625 * @since 1.5
3626 */
3627 @SuppressWarnings("unchecked")
3628 @HotSpotIntrinsicCandidate
3629 public T cast(Object obj) {
3630 if (obj != null && !isInstance(obj))
3631 throw new ClassCastException(cannotCastMsg(obj));
3632 return (T) obj;
3633 }
3634
3635 private String cannotCastMsg(Object obj) {
3636 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3637 }
3638
3639 /**
3640 * Casts this {@code Class} object to represent a subclass of the class
3641 * represented by the specified class object. Checks that the cast
3642 * is valid, and throws a {@code ClassCastException} if it is not. If
3643 * this method succeeds, it always returns a reference to this class object.
3644 *
3645 * <p>This method is useful when a client needs to "narrow" the type of
3646 * a {@code Class} object to pass it to an API that restricts the
3647 * {@code Class} objects that it is willing to accept. A cast would
3648 * generate a compile-time warning, as the correctness of the cast
3649 * could not be checked at runtime (because generic types are implemented
3650 * by erasure).
3651 *
3652 * @param <U> the type to cast this class object to
3653 * @param clazz the class of the type to cast this class object to
3654 * @return this {@code Class} object, cast to represent a subclass of
3655 * the specified class object.
3656 * @throws ClassCastException if this {@code Class} object does not
3657 * represent a subclass of the specified class (here "subclass" includes
3658 * the class itself).
3659 * @since 1.5
3660 */
3661 @SuppressWarnings("unchecked")
3662 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3663 if (clazz.isAssignableFrom(this))
3664 return (Class<? extends U>) this;
3665 else
3666 throw new ClassCastException(this.toString());
3667 }
3668
3669 /**
3670 * @throws NullPointerException {@inheritDoc}
3671 * @since 1.5
3672 */
3673 @SuppressWarnings("unchecked")
3674 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3675 Objects.requireNonNull(annotationClass);
3676
3677 return (A) annotationData().annotations.get(annotationClass);
3678 }
3679
3680 /**
3681 * {@inheritDoc}
3682 * @throws NullPointerException {@inheritDoc}
3683 * @since 1.5
3684 */
3685 @Override
3686 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3687 return GenericDeclaration.super.isAnnotationPresent(annotationClass);
3688 }
3689
3690 /**
3691 * @throws NullPointerException {@inheritDoc}
3692 * @since 1.8
3693 */
3694 @Override
3695 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
3696 Objects.requireNonNull(annotationClass);
3697
3698 AnnotationData annotationData = annotationData();
3699 return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
3700 this,
3701 annotationClass);
3702 }
3703
3704 /**
3705 * @since 1.5
3706 */
3707 public Annotation[] getAnnotations() {
3708 return AnnotationParser.toArray(annotationData().annotations);
3709 }
3710
3711 /**
3712 * @throws NullPointerException {@inheritDoc}
3713 * @since 1.8
3714 */
3715 @Override
3716 @SuppressWarnings("unchecked")
3717 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3718 Objects.requireNonNull(annotationClass);
3719
3720 return (A) annotationData().declaredAnnotations.get(annotationClass);
3721 }
3722
3723 /**
3724 * @throws NullPointerException {@inheritDoc}
3725 * @since 1.8
3726 */
3727 @Override
3728 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
3729 Objects.requireNonNull(annotationClass);
3730
3731 return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
3732 annotationClass);
3733 }
3734
3735 /**
3736 * @since 1.5
3737 */
3738 public Annotation[] getDeclaredAnnotations() {
3739 return AnnotationParser.toArray(annotationData().declaredAnnotations);
3740 }
3741
3742 // annotation data that might get invalidated when JVM TI RedefineClasses() is called
3743 private static class AnnotationData {
3744 final Map<Class<? extends Annotation>, Annotation> annotations;
3745 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3746
3747 // Value of classRedefinedCount when we created this AnnotationData instance
3748 final int redefinedCount;
3749
3750 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
3751 Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
3752 int redefinedCount) {
3753 this.annotations = annotations;
3754 this.declaredAnnotations = declaredAnnotations;
3755 this.redefinedCount = redefinedCount;
3756 }
3757 }
3758
3759 // Annotations cache
3760 @SuppressWarnings("UnusedDeclaration")
3761 private transient volatile AnnotationData annotationData;
3762
3763 private AnnotationData annotationData() {
3764 while (true) { // retry loop
3765 AnnotationData annotationData = this.annotationData;
3766 int classRedefinedCount = this.classRedefinedCount;
3767 if (annotationData != null &&
3768 annotationData.redefinedCount == classRedefinedCount) {
3769 return annotationData;
3770 }
3771 // null or stale annotationData -> optimistically create new instance
3772 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
3773 // try to install it
3774 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
3775 // successfully installed new AnnotationData
3776 return newAnnotationData;
3777 }
3778 }
3779 }
3780
3781 private AnnotationData createAnnotationData(int classRedefinedCount) {
3782 Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
3783 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
3784 Class<?> superClass = getSuperclass();
3785 Map<Class<? extends Annotation>, Annotation> annotations = null;
3786 if (superClass != null) {
3787 Map<Class<? extends Annotation>, Annotation> superAnnotations =
3788 superClass.annotationData().annotations;
3789 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
3790 Class<? extends Annotation> annotationClass = e.getKey();
3791 if (AnnotationType.getInstance(annotationClass).isInherited()) {
3792 if (annotations == null) { // lazy construction
3793 annotations = new LinkedHashMap<>((Math.max(
3794 declaredAnnotations.size(),
3795 Math.min(12, declaredAnnotations.size() + superAnnotations.size())
3796 ) * 4 + 2) / 3
3797 );
3798 }
3799 annotations.put(annotationClass, e.getValue());
3800 }
3801 }
3802 }
3803 if (annotations == null) {
3804 // no inherited annotations -> share the Map with declaredAnnotations
3805 annotations = declaredAnnotations;
3806 } else {
3807 // at least one inherited annotation -> declared may override inherited
3808 annotations.putAll(declaredAnnotations);
3809 }
3810 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
3811 }
3812
3813 // Annotation types cache their internal (AnnotationType) form
3814
3815 @SuppressWarnings("UnusedDeclaration")
3816 private transient volatile AnnotationType annotationType;
3817
3818 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
3819 return Atomic.casAnnotationType(this, oldType, newType);
3820 }
3821
3822 AnnotationType getAnnotationType() {
3823 return annotationType;
3824 }
3825
3826 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() {
3827 return annotationData().declaredAnnotations;
3828 }
3829
3830 /* Backing store of user-defined values pertaining to this class.
3831 * Maintained by the ClassValue class.
3832 */
3833 transient ClassValue.ClassValueMap classValueMap;
3834
3835 /**
3836 * Returns an {@code AnnotatedType} object that represents the use of a
3837 * type to specify the superclass of the entity represented by this {@code
3838 * Class} object. (The <em>use</em> of type Foo to specify the superclass
3839 * in '... extends Foo' is distinct from the <em>declaration</em> of type
3840 * Foo.)
3841 *
3842 * <p> If this {@code Class} object represents a type whose declaration
3843 * does not explicitly indicate an annotated superclass, then the return
3844 * value is an {@code AnnotatedType} object representing an element with no
3845 * annotations.
3846 *
3847 * <p> If this {@code Class} represents either the {@code Object} class, an
3848 * interface type, an array type, a primitive type, or void, the return
3849 * value is {@code null}.
3850 *
3851 * @return an object representing the superclass
3852 * @since 1.8
3853 */
3854 public AnnotatedType getAnnotatedSuperclass() {
3855 if (this == Object.class ||
3856 isInterface() ||
3857 isArray() ||
3858 isPrimitive() ||
3859 this == Void.TYPE) {
3860 return null;
3861 }
3862
3863 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
3864 }
3865
3866 /**
3867 * Returns an array of {@code AnnotatedType} objects that represent the use
3868 * of types to specify superinterfaces of the entity represented by this
3869 * {@code Class} object. (The <em>use</em> of type Foo to specify a
3870 * superinterface in '... implements Foo' is distinct from the
3871 * <em>declaration</em> of type Foo.)
3872 *
3873 * <p> If this {@code Class} object represents a class, the return value is
3874 * an array containing objects representing the uses of interface types to
3875 * specify interfaces implemented by the class. The order of the objects in
3876 * the array corresponds to the order of the interface types used in the
3877 * 'implements' clause of the declaration of this {@code Class} object.
3878 *
3879 * <p> If this {@code Class} object represents an interface, the return
3880 * value is an array containing objects representing the uses of interface
3881 * types to specify interfaces directly extended by the interface. The
3882 * order of the objects in the array corresponds to the order of the
3883 * interface types used in the 'extends' clause of the declaration of this
3884 * {@code Class} object.
3885 *
3886 * <p> If this {@code Class} object represents a class or interface whose
3887 * declaration does not explicitly indicate any annotated superinterfaces,
3888 * the return value is an array of length 0.
3889 *
3890 * <p> If this {@code Class} object represents either the {@code Object}
3891 * class, an array type, a primitive type, or void, the return value is an
3892 * array of length 0.
3893 *
3894 * @return an array representing the superinterfaces
3895 * @since 1.8
3896 */
3897 public AnnotatedType[] getAnnotatedInterfaces() {
3898 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
3899 }
3900 }