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
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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).
17 * You should have received a copy of the GNU General Public License version
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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 public native boolean isPrimitive();
336 * Returns true if this {@code Class} object represents an annotation
337 * type. Note that if this method returns true, {@link #isInterface()}
338 * would also return true, as all annotation types are also interfaces.
340 * @return {@code true} if this class object represents an annotation
341 * type; {@code false} otherwise
344 public boolean isAnnotation() {
345 return (getModifiers() & ANNOTATION) != 0;
349 * Returns {@code true} if this class is a synthetic class;
350 * returns {@code false} otherwise.
351 * @return {@code true} if and only if this class is a synthetic class as
352 * defined by the Java Language Specification.
355 public boolean isSynthetic() {
356 return (getModifiers() & SYNTHETIC) != 0;
360 * Returns the name of the entity (class, interface, array class,
361 * primitive type, or void) represented by this {@code Class} object,
362 * as a {@code String}.
364 * <p> If this class object represents a reference type that is not an
365 * array type then the binary name of the class is returned, as specified
367 * <cite>The Java™ Language Specification</cite>.
369 * <p> If this class object represents a primitive type or void, then the
370 * name returned is a {@code String} equal to the Java language
371 * keyword corresponding to the primitive type or void.
373 * <p> If this class object represents a class of arrays, then the internal
374 * form of the name consists of the name of the element type preceded by
375 * one or more '{@code [}' characters representing the depth of the array
376 * nesting. The encoding of element type names is as follows:
378 * <blockquote><table summary="Element types and encodings">
379 * <tr><th> Element Type <th> <th> Encoding
380 * <tr><td> boolean <td> <td align=center> Z
381 * <tr><td> byte <td> <td align=center> B
382 * <tr><td> char <td> <td align=center> C
383 * <tr><td> class or interface
384 * <td> <td align=center> L<i>classname</i>;
385 * <tr><td> double <td> <td align=center> D
386 * <tr><td> float <td> <td align=center> F
387 * <tr><td> int <td> <td align=center> I
388 * <tr><td> long <td> <td align=center> J
389 * <tr><td> short <td> <td align=center> S
390 * </table></blockquote>
392 * <p> The class or interface name <i>classname</i> is the binary name of
393 * the class specified above.
397 * String.class.getName()
398 * returns "java.lang.String"
399 * byte.class.getName()
401 * (new Object[3]).getClass().getName()
402 * returns "[Ljava.lang.Object;"
403 * (new int[3][4][5][6][7][8][9]).getClass().getName()
405 * </pre></blockquote>
407 * @return the name of the class or interface
408 * represented by this object.
410 public String getName() {
411 return jvmName().replace('/', '.');
414 @JavaScriptBody(args = "self", body = "return self.jvmName;")
415 private native String jvmName();
419 * Returns an array of {@code TypeVariable} objects that represent the
420 * type variables declared by the generic declaration represented by this
421 * {@code GenericDeclaration} object, in declaration order. Returns an
422 * array of length 0 if the underlying generic declaration declares no type
425 * @return an array of {@code TypeVariable} objects that represent
426 * the type variables declared by this generic declaration
427 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
428 * signature of this generic declaration does not conform to
429 * the format specified in
430 * <cite>The Java™ Virtual Machine Specification</cite>
433 public TypeVariable<Class<T>>[] getTypeParameters() {
434 throw new UnsupportedOperationException();
438 * Returns the {@code Class} representing the superclass of the entity
439 * (class, interface, primitive type or void) represented by this
440 * {@code Class}. If this {@code Class} represents either the
441 * {@code Object} class, an interface, a primitive type, or void, then
442 * null is returned. If this object represents an array class then the
443 * {@code Class} object representing the {@code Object} class is
446 * @return the superclass of the class represented by this object.
448 @JavaScriptBody(args = "self", body = "return self.superclass;")
449 public native Class<? super T> getSuperclass();
452 * Returns the Java language modifiers for this class or interface, encoded
453 * in an integer. The modifiers consist of the Java Virtual Machine's
454 * constants for {@code public}, {@code protected},
455 * {@code private}, {@code final}, {@code static},
456 * {@code abstract} and {@code interface}; they should be decoded
457 * using the methods of class {@code Modifier}.
459 * <p> If the underlying class is an array class, then its
460 * {@code public}, {@code private} and {@code protected}
461 * modifiers are the same as those of its component type. If this
462 * {@code Class} represents a primitive type or void, its
463 * {@code public} modifier is always {@code true}, and its
464 * {@code protected} and {@code private} modifiers are always
465 * {@code false}. If this object represents an array class, a
466 * primitive type or void, then its {@code final} modifier is always
467 * {@code true} and its interface modifier is always
468 * {@code false}. The values of its other modifiers are not determined
469 * by this specification.
471 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
472 * Specification</em>, table 4.1.
474 * @return the {@code int} representing the modifiers for this class
475 * @see java.lang.reflect.Modifier
478 public native int getModifiers();
482 * Returns the simple name of the underlying class as given in the
483 * source code. Returns an empty string if the underlying class is
486 * <p>The simple name of an array is the simple name of the
487 * component type with "[]" appended. In particular the simple
488 * name of an array whose component type is anonymous is "[]".
490 * @return the simple name of the underlying class
493 public String getSimpleName() {
495 return getComponentType().getSimpleName()+"[]";
497 String simpleName = getSimpleBinaryName();
498 if (simpleName == null) { // top level class
499 simpleName = getName();
500 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
502 // According to JLS3 "Binary Compatibility" (13.1) the binary
503 // name of non-package classes (not top level) is the binary
504 // name of the immediately enclosing class followed by a '$' followed by:
505 // (for nested and inner classes): the simple name.
506 // (for local classes): 1 or more digits followed by the simple name.
507 // (for anonymous classes): 1 or more digits.
509 // Since getSimpleBinaryName() will strip the binary name of
510 // the immediatly enclosing class, we are now looking at a
511 // string that matches the regular expression "\$[0-9]*"
512 // followed by a simple name (considering the simple of an
513 // anonymous class to be the empty string).
515 // Remove leading "\$[0-9]*" from the name
516 int length = simpleName.length();
517 if (length < 1 || simpleName.charAt(0) != '$')
518 throw new IllegalStateException("Malformed class name");
520 while (index < length && isAsciiDigit(simpleName.charAt(index)))
522 // Eventually, this is the empty string iff this is an anonymous class
523 return simpleName.substring(index);
527 * Returns the "simple binary name" of the underlying class, i.e.,
528 * the binary name without the leading enclosing class name.
529 * Returns {@code null} if the underlying class is a top level
532 private String getSimpleBinaryName() {
533 Class<?> enclosingClass = null; // XXX getEnclosingClass();
534 if (enclosingClass == null) // top level class
536 // Otherwise, strip the enclosing class' name
538 return getName().substring(enclosingClass.getName().length());
539 } catch (IndexOutOfBoundsException ex) {
540 throw new IllegalStateException("Malformed class name");
545 * Returns an array containing {@code Field} objects reflecting all
546 * the accessible public fields of the class or interface represented by
547 * this {@code Class} object. The elements in the array returned are
548 * not sorted and are not in any particular order. This method returns an
549 * array of length 0 if the class or interface has no accessible public
550 * fields, or if it represents an array class, a primitive type, or void.
552 * <p> Specifically, if this {@code Class} object represents a class,
553 * this method returns the public fields of this class and of all its
554 * superclasses. If this {@code Class} object represents an
555 * interface, this method returns the fields of this interface and of all
556 * its superinterfaces.
558 * <p> The implicit length field for array class is not reflected by this
559 * method. User code should use the methods of class {@code Array} to
562 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
564 * @return the array of {@code Field} objects representing the
566 * @exception SecurityException
567 * If a security manager, <i>s</i>, is present and any of the
568 * following conditions is met:
573 * {@link SecurityManager#checkMemberAccess
574 * s.checkMemberAccess(this, Member.PUBLIC)} denies
575 * access to the fields within this class
577 * <li> the caller's class loader is not the same as or an
578 * ancestor of the class loader for the current class and
579 * invocation of {@link SecurityManager#checkPackageAccess
580 * s.checkPackageAccess()} denies access to the package
587 public Field[] getFields() throws SecurityException {
588 throw new SecurityException();
592 * Returns an array containing {@code Method} objects reflecting all
593 * the public <em>member</em> methods of the class or interface represented
594 * by this {@code Class} object, including those declared by the class
595 * or interface and those inherited from superclasses and
596 * superinterfaces. Array classes return all the (public) member methods
597 * inherited from the {@code Object} class. The elements in the array
598 * returned are not sorted and are not in any particular order. This
599 * method returns an array of length 0 if this {@code Class} object
600 * represents a class or interface that has no public member methods, or if
601 * this {@code Class} object represents a primitive type or void.
603 * <p> The class initialization method {@code <clinit>} is not
604 * included in the returned array. If the class declares multiple public
605 * member methods with the same parameter types, they are all included in
606 * the returned array.
608 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
610 * @return the array of {@code Method} objects representing the
611 * public methods of this class
612 * @exception SecurityException
613 * If a security manager, <i>s</i>, is present and any of the
614 * following conditions is met:
619 * {@link SecurityManager#checkMemberAccess
620 * s.checkMemberAccess(this, Member.PUBLIC)} denies
621 * access to the methods within this class
623 * <li> the caller's class loader is not the same as or an
624 * ancestor of the class loader for the current class and
625 * invocation of {@link SecurityManager#checkPackageAccess
626 * s.checkPackageAccess()} denies access to the package
633 public Method[] getMethods() throws SecurityException {
634 return Method.findMethods(this);
638 * Returns a {@code Field} object that reflects the specified public
639 * member field of the class or interface represented by this
640 * {@code Class} object. The {@code name} parameter is a
641 * {@code String} specifying the simple name of the desired field.
643 * <p> The field to be reflected is determined by the algorithm that
644 * follows. Let C be the class represented by this object:
646 * <LI> If C declares a public field with the name specified, that is the
647 * field to be reflected.</LI>
648 * <LI> If no field was found in step 1 above, this algorithm is applied
649 * recursively to each direct superinterface of C. The direct
650 * superinterfaces are searched in the order they were declared.</LI>
651 * <LI> If no field was found in steps 1 and 2 above, and C has a
652 * superclass S, then this algorithm is invoked recursively upon S.
653 * If C has no superclass, then a {@code NoSuchFieldException}
657 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
659 * @param name the field name
660 * @return the {@code Field} object of this class specified by
662 * @exception NoSuchFieldException if a field with the specified name is
664 * @exception NullPointerException if {@code name} is {@code null}
665 * @exception SecurityException
666 * If a security manager, <i>s</i>, is present and any of the
667 * following conditions is met:
672 * {@link SecurityManager#checkMemberAccess
673 * s.checkMemberAccess(this, Member.PUBLIC)} denies
674 * access to the field
676 * <li> the caller's class loader is not the same as or an
677 * ancestor of the class loader for the current class and
678 * invocation of {@link SecurityManager#checkPackageAccess
679 * s.checkPackageAccess()} denies access to the package
686 public Field getField(String name)
687 throws SecurityException {
688 throw new SecurityException();
693 * Returns a {@code Method} object that reflects the specified public
694 * member method of the class or interface represented by this
695 * {@code Class} object. The {@code name} parameter is a
696 * {@code String} specifying the simple name of the desired method. The
697 * {@code parameterTypes} parameter is an array of {@code Class}
698 * objects that identify the method's formal parameter types, in declared
699 * order. If {@code parameterTypes} is {@code null}, it is
700 * treated as if it were an empty array.
702 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
703 * {@code NoSuchMethodException} is raised. Otherwise, the method to
704 * be reflected is determined by the algorithm that follows. Let C be the
705 * class represented by this object:
707 * <LI> C is searched for any <I>matching methods</I>. If no matching
708 * method is found, the algorithm of step 1 is invoked recursively on
709 * the superclass of C.</LI>
710 * <LI> If no method was found in step 1 above, the superinterfaces of C
711 * are searched for a matching method. If any such method is found, it
715 * To find a matching method in a class C: If C declares exactly one
716 * public method with the specified name and exactly the same formal
717 * parameter types, that is the method reflected. If more than one such
718 * method is found in C, and one of these methods has a return type that is
719 * more specific than any of the others, that method is reflected;
720 * otherwise one of the methods is chosen arbitrarily.
722 * <p>Note that there may be more than one matching method in a
723 * class because while the Java language forbids a class to
724 * declare multiple methods with the same signature but different
725 * return types, the Java virtual machine does not. This
726 * increased flexibility in the virtual machine can be used to
727 * implement various language features. For example, covariant
728 * returns can be implemented with {@linkplain
729 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
730 * method and the method being overridden would have the same
731 * signature but different return types.
733 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
735 * @param name the name of the method
736 * @param parameterTypes the list of parameters
737 * @return the {@code Method} object that matches the specified
738 * {@code name} and {@code parameterTypes}
739 * @exception NoSuchMethodException if a matching method is not found
740 * or if the name is "<init>"or "<clinit>".
741 * @exception NullPointerException if {@code name} is {@code null}
742 * @exception SecurityException
743 * If a security manager, <i>s</i>, is present and any of the
744 * following conditions is met:
749 * {@link SecurityManager#checkMemberAccess
750 * s.checkMemberAccess(this, Member.PUBLIC)} denies
751 * access to the method
753 * <li> the caller's class loader is not the same as or an
754 * ancestor of the class loader for the current class and
755 * invocation of {@link SecurityManager#checkPackageAccess
756 * s.checkPackageAccess()} denies access to the package
763 public Method getMethod(String name, Class<?>... parameterTypes)
764 throws SecurityException {
765 Method m = Method.findMethod(this, name, parameterTypes);
767 throw new SecurityException(); // XXX: NoSuchMethodException
773 * Character.isDigit answers {@code true} to some non-ascii
774 * digits. This one does not.
776 private static boolean isAsciiDigit(char c) {
777 return '0' <= c && c <= '9';
781 * Returns the canonical name of the underlying class as
782 * defined by the Java Language Specification. Returns null if
783 * the underlying class does not have a canonical name (i.e., if
784 * it is a local or anonymous class or an array whose component
785 * type does not have a canonical name).
786 * @return the canonical name of the underlying class if it exists, and
787 * {@code null} otherwise.
790 public String getCanonicalName() {
792 String canonicalName = getComponentType().getCanonicalName();
793 if (canonicalName != null)
794 return canonicalName + "[]";
798 // if (isLocalOrAnonymousClass())
800 // Class<?> enclosingClass = getEnclosingClass();
801 Class<?> enclosingClass = null;
802 if (enclosingClass == null) { // top level class
805 String enclosingName = enclosingClass.getCanonicalName();
806 if (enclosingName == null)
808 return enclosingName + "." + getSimpleName();
813 * Finds a resource with a given name. The rules for searching resources
814 * associated with a given class are implemented by the defining
815 * {@linkplain ClassLoader class loader} of the class. This method
816 * delegates to this object's class loader. If this object was loaded by
817 * the bootstrap class loader, the method delegates to {@link
818 * ClassLoader#getSystemResourceAsStream}.
820 * <p> Before delegation, an absolute resource name is constructed from the
821 * given resource name using this algorithm:
825 * <li> If the {@code name} begins with a {@code '/'}
826 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
827 * portion of the {@code name} following the {@code '/'}.
829 * <li> Otherwise, the absolute name is of the following form:
832 * {@code modified_package_name/name}
835 * <p> Where the {@code modified_package_name} is the package name of this
836 * object with {@code '/'} substituted for {@code '.'}
837 * (<tt>'\u002e'</tt>).
841 * @param name name of the desired resource
842 * @return A {@link java.io.InputStream} object or {@code null} if
843 * no resource with this name is found
844 * @throws NullPointerException If {@code name} is {@code null}
847 public InputStream getResourceAsStream(String name) {
848 name = resolveName(name);
849 ClassLoader cl = getClassLoader0();
852 return ClassLoader.getSystemResourceAsStream(name);
854 return cl.getResourceAsStream(name);
858 * Finds a resource with a given name. The rules for searching resources
859 * associated with a given class are implemented by the defining
860 * {@linkplain ClassLoader class loader} of the class. This method
861 * delegates to this object's class loader. If this object was loaded by
862 * the bootstrap class loader, the method delegates to {@link
863 * ClassLoader#getSystemResource}.
865 * <p> Before delegation, an absolute resource name is constructed from the
866 * given resource name using this algorithm:
870 * <li> If the {@code name} begins with a {@code '/'}
871 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
872 * portion of the {@code name} following the {@code '/'}.
874 * <li> Otherwise, the absolute name is of the following form:
877 * {@code modified_package_name/name}
880 * <p> Where the {@code modified_package_name} is the package name of this
881 * object with {@code '/'} substituted for {@code '.'}
882 * (<tt>'\u002e'</tt>).
886 * @param name name of the desired resource
887 * @return A {@link java.net.URL} object or {@code null} if no
888 * resource with this name is found
891 public java.net.URL getResource(String name) {
892 name = resolveName(name);
893 ClassLoader cl = getClassLoader0();
896 return ClassLoader.getSystemResource(name);
898 return cl.getResource(name);
903 * Add a package name prefix if the name is not absolute Remove leading "/"
904 * if name is absolute
906 private String resolveName(String name) {
910 if (!name.startsWith("/")) {
912 while (c.isArray()) {
913 c = c.getComponentType();
915 String baseName = c.getName();
916 int index = baseName.lastIndexOf('.');
918 name = baseName.substring(0, index).replace('.', '/')
922 name = name.substring(1);
928 * Returns the class loader for the class. Some implementations may use
929 * null to represent the bootstrap class loader. This method will return
930 * null in such implementations if this class was loaded by the bootstrap
933 * <p> If a security manager is present, and the caller's class loader is
934 * not null and the caller's class loader is not the same as or an ancestor of
935 * the class loader for the class whose class loader is requested, then
936 * this method calls the security manager's {@code checkPermission}
937 * method with a {@code RuntimePermission("getClassLoader")}
938 * permission to ensure it's ok to access the class loader for the class.
941 * represents a primitive type or void, null is returned.
943 * @return the class loader that loaded the class or interface
944 * represented by this object.
945 * @throws SecurityException
946 * if a security manager exists and its
947 * {@code checkPermission} method denies
948 * access to the class loader for the class.
949 * @see java.lang.ClassLoader
950 * @see SecurityManager#checkPermission
951 * @see java.lang.RuntimePermission
953 public ClassLoader getClassLoader() {
954 throw new SecurityException();
957 // Package-private to allow ClassLoader access
958 native ClassLoader getClassLoader0();
961 * Returns the {@code Class} representing the component type of an
962 * array. If this class does not represent an array class this method
965 * @return the {@code Class} representing the component type of this
966 * class if this class is an array
967 * @see java.lang.reflect.Array
970 public Class<?> getComponentType() {
975 * Returns true if and only if this class was declared as an enum in the
978 * @return true if and only if this class was declared as an enum in the
982 public boolean isEnum() {
983 // An enum must both directly extend java.lang.Enum and have
984 // the ENUM bit set; classes for specialized enum constants
985 // don't do the former.
986 return (this.getModifiers() & ENUM) != 0 &&
987 this.getSuperclass() == java.lang.Enum.class;
991 * Casts an object to the class or interface represented
992 * by this {@code Class} object.
994 * @param obj the object to be cast
995 * @return the object after casting, or null if obj is null
997 * @throws ClassCastException if the object is not
998 * null and is not assignable to the type T.
1002 public T cast(Object obj) {
1003 if (obj != null && !isInstance(obj))
1004 throw new ClassCastException(cannotCastMsg(obj));
1008 private String cannotCastMsg(Object obj) {
1009 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
1013 * Casts this {@code Class} object to represent a subclass of the class
1014 * represented by the specified class object. Checks that that the cast
1015 * is valid, and throws a {@code ClassCastException} if it is not. If
1016 * this method succeeds, it always returns a reference to this class object.
1018 * <p>This method is useful when a client needs to "narrow" the type of
1019 * a {@code Class} object to pass it to an API that restricts the
1020 * {@code Class} objects that it is willing to accept. A cast would
1021 * generate a compile-time warning, as the correctness of the cast
1022 * could not be checked at runtime (because generic types are implemented
1025 * @return this {@code Class} object, cast to represent a subclass of
1026 * the specified class object.
1027 * @throws ClassCastException if this {@code Class} object does not
1028 * represent a subclass of the specified class (here "subclass" includes
1029 * the class itself).
1032 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
1033 if (clazz.isAssignableFrom(this))
1034 return (Class<? extends U>) this;
1036 throw new ClassCastException(this.toString());
1039 @JavaScriptBody(args = { "self", "ac" },
1042 + " return self.anno['L' + ac.jvmName + ';'];"
1043 + "} else return null;"
1045 private Object getAnnotationData(Class<?> annotationClass) {
1046 throw new UnsupportedOperationException();
1049 * @throws NullPointerException {@inheritDoc}
1052 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
1053 Object data = getAnnotationData(annotationClass);
1054 return data == null ? null : AnnotationImpl.create(annotationClass, data);
1058 * @throws NullPointerException {@inheritDoc}
1061 @JavaScriptBody(args = { "self", "ac" },
1062 body = "if (self.anno && self.anno['L' + ac.jvmName + ';']) { return true; }"
1063 + "else return false;"
1065 public boolean isAnnotationPresent(
1066 Class<? extends Annotation> annotationClass) {
1067 if (annotationClass == null)
1068 throw new NullPointerException();
1070 return getAnnotation(annotationClass) != null;
1073 @JavaScriptBody(args = "self", body = "return self.anno;")
1074 private Object getAnnotationData() {
1075 throw new UnsupportedOperationException();
1081 public Annotation[] getAnnotations() {
1082 Object data = getAnnotationData();
1083 return data == null ? new Annotation[0] : AnnotationImpl.create(data);
1089 public Annotation[] getDeclaredAnnotations() {
1090 throw new UnsupportedOperationException();
1093 @JavaScriptBody(args = "type", body = ""
1094 + "var c = vm.java_lang_Class(true);"
1095 + "c.jvmName = type;"
1098 native static Class getPrimitiveClass(String type);
1100 public boolean desiredAssertionStatus() {