2 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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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
28 import org.apidesign.bck2brwsr.emul.AnnotationImpl;
29 import java.io.InputStream;
30 import java.lang.annotation.Annotation;
31 import java.lang.reflect.Field;
32 import java.lang.reflect.Method;
33 import java.lang.reflect.TypeVariable;
34 import org.apidesign.bck2brwsr.core.JavaScriptBody;
37 * Instances of the class {@code Class} represent classes and
38 * interfaces in a running Java application. An enum is a kind of
39 * class and an annotation is a kind of interface. Every array also
40 * belongs to a class that is reflected as a {@code Class} object
41 * that is shared by all arrays with the same element type and number
42 * of dimensions. The primitive Java types ({@code boolean},
43 * {@code byte}, {@code char}, {@code short},
44 * {@code int}, {@code long}, {@code float}, and
45 * {@code double}), and the keyword {@code void} are also
46 * represented as {@code Class} objects.
48 * <p> {@code Class} has no public constructor. Instead {@code Class}
49 * objects are constructed automatically by the Java Virtual Machine as classes
50 * are loaded and by calls to the {@code defineClass} method in the class
53 * <p> The following example uses a {@code Class} object to print the
54 * class name of an object:
56 * <p> <blockquote><pre>
57 * void printClassName(Object obj) {
58 * System.out.println("The class of " + obj +
59 * " is " + obj.getClass().getName());
63 * <p> It is also possible to get the {@code Class} object for a named
64 * type (or for void) using a class literal. See Section 15.8.2 of
65 * <cite>The Java™ Language Specification</cite>.
69 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
72 * @param <T> the type of the class modeled by this {@code Class}
73 * object. For example, the type of {@code String.class} is {@code
74 * Class<String>}. Use {@code Class<?>} if the class being modeled is
78 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
82 class Class<T> implements java.io.Serializable,
83 java.lang.reflect.GenericDeclaration,
84 java.lang.reflect.Type,
85 java.lang.reflect.AnnotatedElement {
86 private static final int ANNOTATION= 0x00002000;
87 private static final int ENUM = 0x00004000;
88 private static final int SYNTHETIC = 0x00001000;
91 * Constructor. Only the Java Virtual Machine creates Class
98 * Converts the object to a string. The string representation is the
99 * string "class" or "interface", followed by a space, and then by the
100 * fully qualified name of the class in the format returned by
101 * {@code getName}. If this {@code Class} object represents a
102 * primitive type, this method returns the name of the primitive type. If
103 * this {@code Class} object represents void this method returns
106 * @return a string representation of this class object.
108 public String toString() {
109 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
115 * Returns the {@code Class} object associated with the class or
116 * interface with the given string name. Invoking this method is
120 * {@code Class.forName(className, true, currentLoader)}
123 * where {@code currentLoader} denotes the defining class loader of
126 * <p> For example, the following code fragment returns the
127 * runtime {@code Class} descriptor for the class named
128 * {@code java.lang.Thread}:
131 * {@code Class t = Class.forName("java.lang.Thread")}
134 * A call to {@code forName("X")} causes the class named
135 * {@code X} to be initialized.
137 * @param className the fully qualified name of the desired class.
138 * @return the {@code Class} object for the class with the
140 * @exception LinkageError if the linkage fails
141 * @exception ExceptionInInitializerError if the initialization provoked
142 * by this method fails
143 * @exception ClassNotFoundException if the class cannot be located
145 public static Class<?> forName(String className)
146 throws ClassNotFoundException {
147 Class<?> c = loadCls(className, className.replace('.', '_'));
149 throw new ClassNotFoundException();
154 @JavaScriptBody(args = {"n", "c" }, body =
155 "if (vm[c]) return vm[c].$class;\n"
156 + "if (vm.loadClass) {\n"
157 + " vm.loadClass(n);\n"
158 + " if (vm[c]) return vm[c].$class;\n"
162 private static native Class<?> loadCls(String n, String c);
166 * Creates a new instance of the class represented by this {@code Class}
167 * object. The class is instantiated as if by a {@code new}
168 * expression with an empty argument list. The class is initialized if it
169 * has not already been initialized.
171 * <p>Note that this method propagates any exception thrown by the
172 * nullary constructor, including a checked exception. Use of
173 * this method effectively bypasses the compile-time exception
174 * checking that would otherwise be performed by the compiler.
176 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
177 * Constructor.newInstance} method avoids this problem by wrapping
178 * any exception thrown by the constructor in a (checked) {@link
179 * java.lang.reflect.InvocationTargetException}.
181 * @return a newly allocated instance of the class represented by this
183 * @exception IllegalAccessException if the class or its nullary
184 * constructor is not accessible.
185 * @exception InstantiationException
186 * if this {@code Class} represents an abstract class,
187 * an interface, an array class, a primitive type, or void;
188 * or if the class has no nullary constructor;
189 * or if the instantiation fails for some other reason.
190 * @exception ExceptionInInitializerError if the initialization
191 * provoked by this method fails.
192 * @exception SecurityException
193 * If a security manager, <i>s</i>, is present and any of the
194 * following conditions is met:
199 * {@link SecurityManager#checkMemberAccess
200 * s.checkMemberAccess(this, Member.PUBLIC)} denies
201 * creation of new instances of this class
203 * <li> the caller's class loader is not the same as or an
204 * ancestor of the class loader for the current class and
205 * invocation of {@link SecurityManager#checkPackageAccess
206 * s.checkPackageAccess()} denies access to the package
212 @JavaScriptBody(args = "self", body =
213 "var inst = self.cnstr();"
214 + "inst.cons__V(inst);"
217 public T newInstance()
218 throws InstantiationException, IllegalAccessException
220 throw new UnsupportedOperationException();
224 * Determines if the specified {@code Object} is assignment-compatible
225 * with the object represented by this {@code Class}. This method is
226 * the dynamic equivalent of the Java language {@code instanceof}
227 * operator. The method returns {@code true} if the specified
228 * {@code Object} argument is non-null and can be cast to the
229 * reference type represented by this {@code Class} object without
230 * raising a {@code ClassCastException.} It returns {@code false}
233 * <p> Specifically, if this {@code Class} object represents a
234 * declared class, this method returns {@code true} if the specified
235 * {@code Object} argument is an instance of the represented class (or
236 * of any of its subclasses); it returns {@code false} otherwise. If
237 * this {@code Class} object represents an array class, this method
238 * returns {@code true} if the specified {@code Object} argument
239 * can be converted to an object of the array class by an identity
240 * conversion or by a widening reference conversion; it returns
241 * {@code false} otherwise. If this {@code Class} object
242 * represents an interface, this method returns {@code true} if the
243 * class or any superclass of the specified {@code Object} argument
244 * implements this interface; it returns {@code false} otherwise. If
245 * this {@code Class} object represents a primitive type, this method
246 * returns {@code false}.
248 * @param obj the object to check
249 * @return true if {@code obj} is an instance of this class
253 public native boolean isInstance(Object obj);
257 * Determines if the class or interface represented by this
258 * {@code Class} object is either the same as, or is a superclass or
259 * superinterface of, the class or interface represented by the specified
260 * {@code Class} parameter. It returns {@code true} if so;
261 * otherwise it returns {@code false}. If this {@code Class}
262 * object represents a primitive type, this method returns
263 * {@code true} if the specified {@code Class} parameter is
264 * exactly this {@code Class} object; otherwise it returns
267 * <p> Specifically, this method tests whether the type represented by the
268 * specified {@code Class} parameter can be converted to the type
269 * represented by this {@code Class} object via an identity conversion
270 * or via a widening reference conversion. See <em>The Java Language
271 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
273 * @param cls the {@code Class} object to be checked
274 * @return the {@code boolean} value indicating whether objects of the
275 * type {@code cls} can be assigned to objects of this class
276 * @exception NullPointerException if the specified Class parameter is
280 public native boolean isAssignableFrom(Class<?> cls);
284 * Determines if the specified {@code Class} object represents an
287 * @return {@code true} if this object represents an interface;
288 * {@code false} otherwise.
290 public native boolean isInterface();
294 * Determines if this {@code Class} object represents an array class.
296 * @return {@code true} if this object represents an array class;
297 * {@code false} otherwise.
300 public boolean isArray() {
306 * Determines if the specified {@code Class} object represents a
309 * <p> There are nine predefined {@code Class} objects to represent
310 * the eight primitive types and void. These are created by the Java
311 * Virtual Machine, and have the same names as the primitive types that
312 * they represent, namely {@code boolean}, {@code byte},
313 * {@code char}, {@code short}, {@code int},
314 * {@code long}, {@code float}, and {@code double}.
316 * <p> These objects may only be accessed via the following public static
317 * final variables, and are the only {@code Class} objects for which
318 * this method returns {@code true}.
320 * @return true if and only if this class represents a primitive type
322 * @see java.lang.Boolean#TYPE
323 * @see java.lang.Character#TYPE
324 * @see java.lang.Byte#TYPE
325 * @see java.lang.Short#TYPE
326 * @see java.lang.Integer#TYPE
327 * @see java.lang.Long#TYPE
328 * @see java.lang.Float#TYPE
329 * @see java.lang.Double#TYPE
330 * @see java.lang.Void#TYPE
333 @JavaScriptBody(args = "self", body =
334 "if (self.primitive) return true;"
335 + "else return false;"
337 public native boolean isPrimitive();
340 * Returns true if this {@code Class} object represents an annotation
341 * type. Note that if this method returns true, {@link #isInterface()}
342 * would also return true, as all annotation types are also interfaces.
344 * @return {@code true} if this class object represents an annotation
345 * type; {@code false} otherwise
348 public boolean isAnnotation() {
349 return (getModifiers() & ANNOTATION) != 0;
353 * Returns {@code true} if this class is a synthetic class;
354 * returns {@code false} otherwise.
355 * @return {@code true} if and only if this class is a synthetic class as
356 * defined by the Java Language Specification.
359 public boolean isSynthetic() {
360 return (getModifiers() & SYNTHETIC) != 0;
364 * Returns the name of the entity (class, interface, array class,
365 * primitive type, or void) represented by this {@code Class} object,
366 * as a {@code String}.
368 * <p> If this class object represents a reference type that is not an
369 * array type then the binary name of the class is returned, as specified
371 * <cite>The Java™ Language Specification</cite>.
373 * <p> If this class object represents a primitive type or void, then the
374 * name returned is a {@code String} equal to the Java language
375 * keyword corresponding to the primitive type or void.
377 * <p> If this class object represents a class of arrays, then the internal
378 * form of the name consists of the name of the element type preceded by
379 * one or more '{@code [}' characters representing the depth of the array
380 * nesting. The encoding of element type names is as follows:
382 * <blockquote><table summary="Element types and encodings">
383 * <tr><th> Element Type <th> <th> Encoding
384 * <tr><td> boolean <td> <td align=center> Z
385 * <tr><td> byte <td> <td align=center> B
386 * <tr><td> char <td> <td align=center> C
387 * <tr><td> class or interface
388 * <td> <td align=center> L<i>classname</i>;
389 * <tr><td> double <td> <td align=center> D
390 * <tr><td> float <td> <td align=center> F
391 * <tr><td> int <td> <td align=center> I
392 * <tr><td> long <td> <td align=center> J
393 * <tr><td> short <td> <td align=center> S
394 * </table></blockquote>
396 * <p> The class or interface name <i>classname</i> is the binary name of
397 * the class specified above.
401 * String.class.getName()
402 * returns "java.lang.String"
403 * byte.class.getName()
405 * (new Object[3]).getClass().getName()
406 * returns "[Ljava.lang.Object;"
407 * (new int[3][4][5][6][7][8][9]).getClass().getName()
409 * </pre></blockquote>
411 * @return the name of the class or interface
412 * represented by this object.
414 public String getName() {
415 return jvmName().replace('/', '.');
418 @JavaScriptBody(args = "self", body = "return self.jvmName;")
419 private native String jvmName();
423 * Returns an array of {@code TypeVariable} objects that represent the
424 * type variables declared by the generic declaration represented by this
425 * {@code GenericDeclaration} object, in declaration order. Returns an
426 * array of length 0 if the underlying generic declaration declares no type
429 * @return an array of {@code TypeVariable} objects that represent
430 * the type variables declared by this generic declaration
431 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
432 * signature of this generic declaration does not conform to
433 * the format specified in
434 * <cite>The Java™ Virtual Machine Specification</cite>
437 public TypeVariable<Class<T>>[] getTypeParameters() {
438 throw new UnsupportedOperationException();
442 * Returns the {@code Class} representing the superclass of the entity
443 * (class, interface, primitive type or void) represented by this
444 * {@code Class}. If this {@code Class} represents either the
445 * {@code Object} class, an interface, a primitive type, or void, then
446 * null is returned. If this object represents an array class then the
447 * {@code Class} object representing the {@code Object} class is
450 * @return the superclass of the class represented by this object.
452 @JavaScriptBody(args = "self", body = "return self.superclass;")
453 public native Class<? super T> getSuperclass();
456 * Returns the Java language modifiers for this class or interface, encoded
457 * in an integer. The modifiers consist of the Java Virtual Machine's
458 * constants for {@code public}, {@code protected},
459 * {@code private}, {@code final}, {@code static},
460 * {@code abstract} and {@code interface}; they should be decoded
461 * using the methods of class {@code Modifier}.
463 * <p> If the underlying class is an array class, then its
464 * {@code public}, {@code private} and {@code protected}
465 * modifiers are the same as those of its component type. If this
466 * {@code Class} represents a primitive type or void, its
467 * {@code public} modifier is always {@code true}, and its
468 * {@code protected} and {@code private} modifiers are always
469 * {@code false}. If this object represents an array class, a
470 * primitive type or void, then its {@code final} modifier is always
471 * {@code true} and its interface modifier is always
472 * {@code false}. The values of its other modifiers are not determined
473 * by this specification.
475 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
476 * Specification</em>, table 4.1.
478 * @return the {@code int} representing the modifiers for this class
479 * @see java.lang.reflect.Modifier
482 public native int getModifiers();
486 * Returns the simple name of the underlying class as given in the
487 * source code. Returns an empty string if the underlying class is
490 * <p>The simple name of an array is the simple name of the
491 * component type with "[]" appended. In particular the simple
492 * name of an array whose component type is anonymous is "[]".
494 * @return the simple name of the underlying class
497 public String getSimpleName() {
499 return getComponentType().getSimpleName()+"[]";
501 String simpleName = getSimpleBinaryName();
502 if (simpleName == null) { // top level class
503 simpleName = getName();
504 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
506 // According to JLS3 "Binary Compatibility" (13.1) the binary
507 // name of non-package classes (not top level) is the binary
508 // name of the immediately enclosing class followed by a '$' followed by:
509 // (for nested and inner classes): the simple name.
510 // (for local classes): 1 or more digits followed by the simple name.
511 // (for anonymous classes): 1 or more digits.
513 // Since getSimpleBinaryName() will strip the binary name of
514 // the immediatly enclosing class, we are now looking at a
515 // string that matches the regular expression "\$[0-9]*"
516 // followed by a simple name (considering the simple of an
517 // anonymous class to be the empty string).
519 // Remove leading "\$[0-9]*" from the name
520 int length = simpleName.length();
521 if (length < 1 || simpleName.charAt(0) != '$')
522 throw new IllegalStateException("Malformed class name");
524 while (index < length && isAsciiDigit(simpleName.charAt(index)))
526 // Eventually, this is the empty string iff this is an anonymous class
527 return simpleName.substring(index);
531 * Returns the "simple binary name" of the underlying class, i.e.,
532 * the binary name without the leading enclosing class name.
533 * Returns {@code null} if the underlying class is a top level
536 private String getSimpleBinaryName() {
537 Class<?> enclosingClass = null; // XXX getEnclosingClass();
538 if (enclosingClass == null) // top level class
540 // Otherwise, strip the enclosing class' name
542 return getName().substring(enclosingClass.getName().length());
543 } catch (IndexOutOfBoundsException ex) {
544 throw new IllegalStateException("Malformed class name");
549 * Returns an array containing {@code Field} objects reflecting all
550 * the accessible public fields of the class or interface represented by
551 * this {@code Class} object. The elements in the array returned are
552 * not sorted and are not in any particular order. This method returns an
553 * array of length 0 if the class or interface has no accessible public
554 * fields, or if it represents an array class, a primitive type, or void.
556 * <p> Specifically, if this {@code Class} object represents a class,
557 * this method returns the public fields of this class and of all its
558 * superclasses. If this {@code Class} object represents an
559 * interface, this method returns the fields of this interface and of all
560 * its superinterfaces.
562 * <p> The implicit length field for array class is not reflected by this
563 * method. User code should use the methods of class {@code Array} to
566 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
568 * @return the array of {@code Field} objects representing the
570 * @exception SecurityException
571 * If a security manager, <i>s</i>, is present and any of the
572 * following conditions is met:
577 * {@link SecurityManager#checkMemberAccess
578 * s.checkMemberAccess(this, Member.PUBLIC)} denies
579 * access to the fields within this class
581 * <li> the caller's class loader is not the same as or an
582 * ancestor of the class loader for the current class and
583 * invocation of {@link SecurityManager#checkPackageAccess
584 * s.checkPackageAccess()} denies access to the package
591 public Field[] getFields() throws SecurityException {
592 throw new SecurityException();
596 * Returns an array containing {@code Method} objects reflecting all
597 * the public <em>member</em> methods of the class or interface represented
598 * by this {@code Class} object, including those declared by the class
599 * or interface and those inherited from superclasses and
600 * superinterfaces. Array classes return all the (public) member methods
601 * inherited from the {@code Object} class. The elements in the array
602 * returned are not sorted and are not in any particular order. This
603 * method returns an array of length 0 if this {@code Class} object
604 * represents a class or interface that has no public member methods, or if
605 * this {@code Class} object represents a primitive type or void.
607 * <p> The class initialization method {@code <clinit>} is not
608 * included in the returned array. If the class declares multiple public
609 * member methods with the same parameter types, they are all included in
610 * the returned array.
612 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
614 * @return the array of {@code Method} objects representing the
615 * public methods of this class
616 * @exception SecurityException
617 * If a security manager, <i>s</i>, is present and any of the
618 * following conditions is met:
623 * {@link SecurityManager#checkMemberAccess
624 * s.checkMemberAccess(this, Member.PUBLIC)} denies
625 * access to the methods within this class
627 * <li> the caller's class loader is not the same as or an
628 * ancestor of the class loader for the current class and
629 * invocation of {@link SecurityManager#checkPackageAccess
630 * s.checkPackageAccess()} denies access to the package
637 public Method[] getMethods() throws SecurityException {
638 return Method.findMethods(this);
642 * Returns a {@code Field} object that reflects the specified public
643 * member field of the class or interface represented by this
644 * {@code Class} object. The {@code name} parameter is a
645 * {@code String} specifying the simple name of the desired field.
647 * <p> The field to be reflected is determined by the algorithm that
648 * follows. Let C be the class represented by this object:
650 * <LI> If C declares a public field with the name specified, that is the
651 * field to be reflected.</LI>
652 * <LI> If no field was found in step 1 above, this algorithm is applied
653 * recursively to each direct superinterface of C. The direct
654 * superinterfaces are searched in the order they were declared.</LI>
655 * <LI> If no field was found in steps 1 and 2 above, and C has a
656 * superclass S, then this algorithm is invoked recursively upon S.
657 * If C has no superclass, then a {@code NoSuchFieldException}
661 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
663 * @param name the field name
664 * @return the {@code Field} object of this class specified by
666 * @exception NoSuchFieldException if a field with the specified name is
668 * @exception NullPointerException if {@code name} is {@code null}
669 * @exception SecurityException
670 * If a security manager, <i>s</i>, is present and any of the
671 * following conditions is met:
676 * {@link SecurityManager#checkMemberAccess
677 * s.checkMemberAccess(this, Member.PUBLIC)} denies
678 * access to the field
680 * <li> the caller's class loader is not the same as or an
681 * ancestor of the class loader for the current class and
682 * invocation of {@link SecurityManager#checkPackageAccess
683 * s.checkPackageAccess()} denies access to the package
690 public Field getField(String name)
691 throws SecurityException {
692 throw new SecurityException();
697 * Returns a {@code Method} object that reflects the specified public
698 * member method of the class or interface represented by this
699 * {@code Class} object. The {@code name} parameter is a
700 * {@code String} specifying the simple name of the desired method. The
701 * {@code parameterTypes} parameter is an array of {@code Class}
702 * objects that identify the method's formal parameter types, in declared
703 * order. If {@code parameterTypes} is {@code null}, it is
704 * treated as if it were an empty array.
706 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
707 * {@code NoSuchMethodException} is raised. Otherwise, the method to
708 * be reflected is determined by the algorithm that follows. Let C be the
709 * class represented by this object:
711 * <LI> C is searched for any <I>matching methods</I>. If no matching
712 * method is found, the algorithm of step 1 is invoked recursively on
713 * the superclass of C.</LI>
714 * <LI> If no method was found in step 1 above, the superinterfaces of C
715 * are searched for a matching method. If any such method is found, it
719 * To find a matching method in a class C: If C declares exactly one
720 * public method with the specified name and exactly the same formal
721 * parameter types, that is the method reflected. If more than one such
722 * method is found in C, and one of these methods has a return type that is
723 * more specific than any of the others, that method is reflected;
724 * otherwise one of the methods is chosen arbitrarily.
726 * <p>Note that there may be more than one matching method in a
727 * class because while the Java language forbids a class to
728 * declare multiple methods with the same signature but different
729 * return types, the Java virtual machine does not. This
730 * increased flexibility in the virtual machine can be used to
731 * implement various language features. For example, covariant
732 * returns can be implemented with {@linkplain
733 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
734 * method and the method being overridden would have the same
735 * signature but different return types.
737 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
739 * @param name the name of the method
740 * @param parameterTypes the list of parameters
741 * @return the {@code Method} object that matches the specified
742 * {@code name} and {@code parameterTypes}
743 * @exception NoSuchMethodException if a matching method is not found
744 * or if the name is "<init>"or "<clinit>".
745 * @exception NullPointerException if {@code name} is {@code null}
746 * @exception SecurityException
747 * If a security manager, <i>s</i>, is present and any of the
748 * following conditions is met:
753 * {@link SecurityManager#checkMemberAccess
754 * s.checkMemberAccess(this, Member.PUBLIC)} denies
755 * access to the method
757 * <li> the caller's class loader is not the same as or an
758 * ancestor of the class loader for the current class and
759 * invocation of {@link SecurityManager#checkPackageAccess
760 * s.checkPackageAccess()} denies access to the package
767 public Method getMethod(String name, Class<?>... parameterTypes)
768 throws SecurityException {
769 Method m = Method.findMethod(this, name, parameterTypes);
771 throw new SecurityException(); // XXX: NoSuchMethodException
777 * Character.isDigit answers {@code true} to some non-ascii
778 * digits. This one does not.
780 private static boolean isAsciiDigit(char c) {
781 return '0' <= c && c <= '9';
785 * Returns the canonical name of the underlying class as
786 * defined by the Java Language Specification. Returns null if
787 * the underlying class does not have a canonical name (i.e., if
788 * it is a local or anonymous class or an array whose component
789 * type does not have a canonical name).
790 * @return the canonical name of the underlying class if it exists, and
791 * {@code null} otherwise.
794 public String getCanonicalName() {
796 String canonicalName = getComponentType().getCanonicalName();
797 if (canonicalName != null)
798 return canonicalName + "[]";
802 // if (isLocalOrAnonymousClass())
804 // Class<?> enclosingClass = getEnclosingClass();
805 Class<?> enclosingClass = null;
806 if (enclosingClass == null) { // top level class
809 String enclosingName = enclosingClass.getCanonicalName();
810 if (enclosingName == null)
812 return enclosingName + "." + getSimpleName();
817 * Finds a resource with a given name. The rules for searching resources
818 * associated with a given class are implemented by the defining
819 * {@linkplain ClassLoader class loader} of the class. This method
820 * delegates to this object's class loader. If this object was loaded by
821 * the bootstrap class loader, the method delegates to {@link
822 * ClassLoader#getSystemResourceAsStream}.
824 * <p> Before delegation, an absolute resource name is constructed from the
825 * given resource name using this algorithm:
829 * <li> If the {@code name} begins with a {@code '/'}
830 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
831 * portion of the {@code name} following the {@code '/'}.
833 * <li> Otherwise, the absolute name is of the following form:
836 * {@code modified_package_name/name}
839 * <p> Where the {@code modified_package_name} is the package name of this
840 * object with {@code '/'} substituted for {@code '.'}
841 * (<tt>'\u002e'</tt>).
845 * @param name name of the desired resource
846 * @return A {@link java.io.InputStream} object or {@code null} if
847 * no resource with this name is found
848 * @throws NullPointerException If {@code name} is {@code null}
851 public InputStream getResourceAsStream(String name) {
852 name = resolveName(name);
853 ClassLoader cl = getClassLoader0();
856 return ClassLoader.getSystemResourceAsStream(name);
858 return cl.getResourceAsStream(name);
862 * Finds a resource with a given name. The rules for searching resources
863 * associated with a given class are implemented by the defining
864 * {@linkplain ClassLoader class loader} of the class. This method
865 * delegates to this object's class loader. If this object was loaded by
866 * the bootstrap class loader, the method delegates to {@link
867 * ClassLoader#getSystemResource}.
869 * <p> Before delegation, an absolute resource name is constructed from the
870 * given resource name using this algorithm:
874 * <li> If the {@code name} begins with a {@code '/'}
875 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
876 * portion of the {@code name} following the {@code '/'}.
878 * <li> Otherwise, the absolute name is of the following form:
881 * {@code modified_package_name/name}
884 * <p> Where the {@code modified_package_name} is the package name of this
885 * object with {@code '/'} substituted for {@code '.'}
886 * (<tt>'\u002e'</tt>).
890 * @param name name of the desired resource
891 * @return A {@link java.net.URL} object or {@code null} if no
892 * resource with this name is found
895 public java.net.URL getResource(String name) {
896 name = resolveName(name);
897 ClassLoader cl = getClassLoader0();
900 return ClassLoader.getSystemResource(name);
902 return cl.getResource(name);
907 * Add a package name prefix if the name is not absolute Remove leading "/"
908 * if name is absolute
910 private String resolveName(String name) {
914 if (!name.startsWith("/")) {
916 while (c.isArray()) {
917 c = c.getComponentType();
919 String baseName = c.getName();
920 int index = baseName.lastIndexOf('.');
922 name = baseName.substring(0, index).replace('.', '/')
926 name = name.substring(1);
932 * Returns the class loader for the class. Some implementations may use
933 * null to represent the bootstrap class loader. This method will return
934 * null in such implementations if this class was loaded by the bootstrap
937 * <p> If a security manager is present, and the caller's class loader is
938 * not null and the caller's class loader is not the same as or an ancestor of
939 * the class loader for the class whose class loader is requested, then
940 * this method calls the security manager's {@code checkPermission}
941 * method with a {@code RuntimePermission("getClassLoader")}
942 * permission to ensure it's ok to access the class loader for the class.
945 * represents a primitive type or void, null is returned.
947 * @return the class loader that loaded the class or interface
948 * represented by this object.
949 * @throws SecurityException
950 * if a security manager exists and its
951 * {@code checkPermission} method denies
952 * access to the class loader for the class.
953 * @see java.lang.ClassLoader
954 * @see SecurityManager#checkPermission
955 * @see java.lang.RuntimePermission
957 public ClassLoader getClassLoader() {
958 throw new SecurityException();
961 // Package-private to allow ClassLoader access
962 native ClassLoader getClassLoader0();
965 * Returns the {@code Class} representing the component type of an
966 * array. If this class does not represent an array class this method
969 * @return the {@code Class} representing the component type of this
970 * class if this class is an array
971 * @see java.lang.reflect.Array
974 public Class<?> getComponentType() {
979 * Returns true if and only if this class was declared as an enum in the
982 * @return true if and only if this class was declared as an enum in the
986 public boolean isEnum() {
987 // An enum must both directly extend java.lang.Enum and have
988 // the ENUM bit set; classes for specialized enum constants
989 // don't do the former.
990 return (this.getModifiers() & ENUM) != 0 &&
991 this.getSuperclass() == java.lang.Enum.class;
995 * Casts an object to the class or interface represented
996 * by this {@code Class} object.
998 * @param obj the object to be cast
999 * @return the object after casting, or null if obj is null
1001 * @throws ClassCastException if the object is not
1002 * null and is not assignable to the type T.
1006 public T cast(Object obj) {
1007 if (obj != null && !isInstance(obj))
1008 throw new ClassCastException(cannotCastMsg(obj));
1012 private String cannotCastMsg(Object obj) {
1013 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
1017 * Casts this {@code Class} object to represent a subclass of the class
1018 * represented by the specified class object. Checks that that the cast
1019 * is valid, and throws a {@code ClassCastException} if it is not. If
1020 * this method succeeds, it always returns a reference to this class object.
1022 * <p>This method is useful when a client needs to "narrow" the type of
1023 * a {@code Class} object to pass it to an API that restricts the
1024 * {@code Class} objects that it is willing to accept. A cast would
1025 * generate a compile-time warning, as the correctness of the cast
1026 * could not be checked at runtime (because generic types are implemented
1029 * @return this {@code Class} object, cast to represent a subclass of
1030 * the specified class object.
1031 * @throws ClassCastException if this {@code Class} object does not
1032 * represent a subclass of the specified class (here "subclass" includes
1033 * the class itself).
1036 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
1037 if (clazz.isAssignableFrom(this))
1038 return (Class<? extends U>) this;
1040 throw new ClassCastException(this.toString());
1043 @JavaScriptBody(args = { "self", "ac" },
1046 + " return self.anno['L' + ac.jvmName + ';'];"
1047 + "} else return null;"
1049 private Object getAnnotationData(Class<?> annotationClass) {
1050 throw new UnsupportedOperationException();
1053 * @throws NullPointerException {@inheritDoc}
1056 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
1057 Object data = getAnnotationData(annotationClass);
1058 return data == null ? null : AnnotationImpl.create(annotationClass, data);
1062 * @throws NullPointerException {@inheritDoc}
1065 @JavaScriptBody(args = { "self", "ac" },
1066 body = "if (self.anno && self.anno['L' + ac.jvmName + ';']) { return true; }"
1067 + "else return false;"
1069 public boolean isAnnotationPresent(
1070 Class<? extends Annotation> annotationClass) {
1071 if (annotationClass == null)
1072 throw new NullPointerException();
1074 return getAnnotation(annotationClass) != null;
1077 @JavaScriptBody(args = "self", body = "return self.anno;")
1078 private Object getAnnotationData() {
1079 throw new UnsupportedOperationException();
1085 public Annotation[] getAnnotations() {
1086 Object data = getAnnotationData();
1087 return data == null ? new Annotation[0] : AnnotationImpl.create(data);
1093 public Annotation[] getDeclaredAnnotations() {
1094 throw new UnsupportedOperationException();
1097 @JavaScriptBody(args = "type", body = ""
1098 + "var c = vm.java_lang_Class(true);"
1099 + "c.jvmName = type;"
1100 + "c.primitive = true;"
1103 native static Class getPrimitiveClass(String type);
1105 public boolean desiredAssertionStatus() {