/* * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.lang; import java.lang.reflect.AnnotatedElement; import java.lang.reflect.Array; import java.lang.reflect.GenericArrayType; import java.lang.reflect.Member; import java.lang.reflect.Field; import java.lang.reflect.Executable; import java.lang.reflect.Method; import java.lang.reflect.Constructor; import java.lang.reflect.Modifier; import java.lang.reflect.Type; import java.lang.reflect.TypeVariable; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.AnnotatedType; import java.lang.ref.SoftReference; import java.io.InputStream; import java.io.ObjectStreamField; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.HashSet; import java.util.List; import java.util.Set; import java.util.Map; import java.util.HashMap; import java.util.Objects; import sun.misc.Unsafe; import sun.reflect.ConstantPool; import sun.reflect.Reflection; import sun.reflect.ReflectionFactory; import sun.reflect.generics.factory.CoreReflectionFactory; import sun.reflect.generics.factory.GenericsFactory; import sun.reflect.generics.repository.ClassRepository; import sun.reflect.generics.repository.MethodRepository; import sun.reflect.generics.repository.ConstructorRepository; import sun.reflect.generics.scope.ClassScope; import sun.security.util.SecurityConstants; import java.lang.annotation.Annotation; import sun.reflect.annotation.*; /** * Instances of the class {@code Class} represent classes and * interfaces in a running Java application. An enum is a kind of * class and an annotation is a kind of interface. Every array also * belongs to a class that is reflected as a {@code Class} object * that is shared by all arrays with the same element type and number * of dimensions. The primitive Java types ({@code boolean}, * {@code byte}, {@code char}, {@code short}, * {@code int}, {@code long}, {@code float}, and * {@code double}), and the keyword {@code void} are also * represented as {@code Class} objects. * *

{@code Class} has no public constructor. Instead {@code Class} * objects are constructed automatically by the Java Virtual Machine as classes * are loaded and by calls to the {@code defineClass} method in the class * loader. * *

The following example uses a {@code Class} object to print the * class name of an object: * *

 *     void printClassName(Object obj) {
 *         System.out.println("The class of " + obj +
 *                            " is " + obj.getClass().getName());
 *     }
 * 
* *

It is also possible to get the {@code Class} object for a named * type (or for void) using a class literal. See Section 15.8.2 of * The Java™ Language Specification. * For example: * *

* {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} *
* * @param the type of the class modeled by this {@code Class} * object. For example, the type of {@code String.class} is {@code * Class}. Use {@code Class} if the class being modeled is * unknown. * * @author unascribed * @see java.lang.ClassLoader#defineClass(byte[], int, int) * @since JDK1.0 */ public final class Class implements java.io.Serializable, java.lang.reflect.GenericDeclaration, java.lang.reflect.Type, java.lang.reflect.AnnotatedElement { private static final int ANNOTATION= 0x00002000; private static final int ENUM = 0x00004000; private static final int SYNTHETIC = 0x00001000; private static native void registerNatives(); static { registerNatives(); } /* * Constructor. Only the Java Virtual Machine creates Class * objects. */ private Class() {} /** * Converts the object to a string. The string representation is the * string "class" or "interface", followed by a space, and then by the * fully qualified name of the class in the format returned by * {@code getName}. If this {@code Class} object represents a * primitive type, this method returns the name of the primitive type. If * this {@code Class} object represents void this method returns * "void". * * @return a string representation of this class object. */ public String toString() { return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) + getName(); } /** * Returns the {@code Class} object associated with the class or * interface with the given string name. Invoking this method is * equivalent to: * *
* {@code Class.forName(className, true, currentLoader)} *
* * where {@code currentLoader} denotes the defining class loader of * the current class. * *

For example, the following code fragment returns the * runtime {@code Class} descriptor for the class named * {@code java.lang.Thread}: * *

* {@code Class t = Class.forName("java.lang.Thread")} *
*

* A call to {@code forName("X")} causes the class named * {@code X} to be initialized. * * @param className the fully qualified name of the desired class. * @return the {@code Class} object for the class with the * specified name. * @exception LinkageError if the linkage fails * @exception ExceptionInInitializerError if the initialization provoked * by this method fails * @exception ClassNotFoundException if the class cannot be located */ public static Class forName(String className) throws ClassNotFoundException { return forName0(className, true, ClassLoader.getCallerClassLoader()); } /** * Returns the {@code Class} object associated with the class or * interface with the given string name, using the given class loader. * Given the fully qualified name for a class or interface (in the same * format returned by {@code getName}) this method attempts to * locate, load, and link the class or interface. The specified class * loader is used to load the class or interface. If the parameter * {@code loader} is null, the class is loaded through the bootstrap * class loader. The class is initialized only if the * {@code initialize} parameter is {@code true} and if it has * not been initialized earlier. * *

If {@code name} denotes a primitive type or void, an attempt * will be made to locate a user-defined class in the unnamed package whose * name is {@code name}. Therefore, this method cannot be used to * obtain any of the {@code Class} objects representing primitive * types or void. * *

If {@code name} denotes an array class, the component type of * the array class is loaded but not initialized. * *

For example, in an instance method the expression: * *

* {@code Class.forName("Foo")} *
* * is equivalent to: * *
* {@code Class.forName("Foo", true, this.getClass().getClassLoader())} *
* * Note that this method throws errors related to loading, linking or * initializing as specified in Sections 12.2, 12.3 and 12.4 of The * Java Language Specification. * Note that this method does not check whether the requested class * is accessible to its caller. * *

If the {@code loader} is {@code null}, and a security * manager is present, and the caller's class loader is not null, then this * method calls the security manager's {@code checkPermission} method * with a {@code RuntimePermission("getClassLoader")} permission to * ensure it's ok to access the bootstrap class loader. * * @param name fully qualified name of the desired class * @param initialize if {@code true} the class will be initialized. * See Section 12.4 of The Java Language Specification. * @param loader class loader from which the class must be loaded * @return class object representing the desired class * * @exception LinkageError if the linkage fails * @exception ExceptionInInitializerError if the initialization provoked * by this method fails * @exception ClassNotFoundException if the class cannot be located by * the specified class loader * * @see java.lang.Class#forName(String) * @see java.lang.ClassLoader * @since 1.2 */ public static Class forName(String name, boolean initialize, ClassLoader loader) throws ClassNotFoundException { if (loader == null) { SecurityManager sm = System.getSecurityManager(); if (sm != null) { ClassLoader ccl = ClassLoader.getCallerClassLoader(); if (ccl != null) { sm.checkPermission( SecurityConstants.GET_CLASSLOADER_PERMISSION); } } } return forName0(name, initialize, loader); } /** Called after security checks have been made. */ private static native Class forName0(String name, boolean initialize, ClassLoader loader) throws ClassNotFoundException; /** * Creates a new instance of the class represented by this {@code Class} * object. The class is instantiated as if by a {@code new} * expression with an empty argument list. The class is initialized if it * has not already been initialized. * *

Note that this method propagates any exception thrown by the * nullary constructor, including a checked exception. Use of * this method effectively bypasses the compile-time exception * checking that would otherwise be performed by the compiler. * The {@link * java.lang.reflect.Constructor#newInstance(java.lang.Object...) * Constructor.newInstance} method avoids this problem by wrapping * any exception thrown by the constructor in a (checked) {@link * java.lang.reflect.InvocationTargetException}. * * @return a newly allocated instance of the class represented by this * object. * @exception IllegalAccessException if the class or its nullary * constructor is not accessible. * @exception InstantiationException * if this {@code Class} represents an abstract class, * an interface, an array class, a primitive type, or void; * or if the class has no nullary constructor; * or if the instantiation fails for some other reason. * @exception ExceptionInInitializerError if the initialization * provoked by this method fails. * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} denies * creation of new instances of this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* */ public T newInstance() throws InstantiationException, IllegalAccessException { if (System.getSecurityManager() != null) { checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); } return newInstance0(); } private T newInstance0() throws InstantiationException, IllegalAccessException { // NOTE: the following code may not be strictly correct under // the current Java memory model. // Constructor lookup if (cachedConstructor == null) { if (this == Class.class) { throw new IllegalAccessException( "Can not call newInstance() on the Class for java.lang.Class" ); } try { Class[] empty = {}; final Constructor c = getConstructor0(empty, Member.DECLARED); // Disable accessibility checks on the constructor // since we have to do the security check here anyway // (the stack depth is wrong for the Constructor's // security check to work) java.security.AccessController.doPrivileged( new java.security.PrivilegedAction() { public Void run() { c.setAccessible(true); return null; } }); cachedConstructor = c; } catch (NoSuchMethodException e) { throw (InstantiationException) new InstantiationException(getName()).initCause(e); } } Constructor tmpConstructor = cachedConstructor; // Security check (same as in java.lang.reflect.Constructor) int modifiers = tmpConstructor.getModifiers(); if (!Reflection.quickCheckMemberAccess(this, modifiers)) { Class caller = Reflection.getCallerClass(3); if (newInstanceCallerCache != caller) { Reflection.ensureMemberAccess(caller, this, null, modifiers); newInstanceCallerCache = caller; } } // Run constructor try { return tmpConstructor.newInstance((Object[])null); } catch (InvocationTargetException e) { Unsafe.getUnsafe().throwException(e.getTargetException()); // Not reached return null; } } private volatile transient Constructor cachedConstructor; private volatile transient Class newInstanceCallerCache; /** * Determines if the specified {@code Object} is assignment-compatible * with the object represented by this {@code Class}. This method is * the dynamic equivalent of the Java language {@code instanceof} * operator. The method returns {@code true} if the specified * {@code Object} argument is non-null and can be cast to the * reference type represented by this {@code Class} object without * raising a {@code ClassCastException.} It returns {@code false} * otherwise. * *

Specifically, if this {@code Class} object represents a * declared class, this method returns {@code true} if the specified * {@code Object} argument is an instance of the represented class (or * of any of its subclasses); it returns {@code false} otherwise. If * this {@code Class} object represents an array class, this method * returns {@code true} if the specified {@code Object} argument * can be converted to an object of the array class by an identity * conversion or by a widening reference conversion; it returns * {@code false} otherwise. If this {@code Class} object * represents an interface, this method returns {@code true} if the * class or any superclass of the specified {@code Object} argument * implements this interface; it returns {@code false} otherwise. If * this {@code Class} object represents a primitive type, this method * returns {@code false}. * * @param obj the object to check * @return true if {@code obj} is an instance of this class * * @since JDK1.1 */ public native boolean isInstance(Object obj); /** * Determines if the class or interface represented by this * {@code Class} object is either the same as, or is a superclass or * superinterface of, the class or interface represented by the specified * {@code Class} parameter. It returns {@code true} if so; * otherwise it returns {@code false}. If this {@code Class} * object represents a primitive type, this method returns * {@code true} if the specified {@code Class} parameter is * exactly this {@code Class} object; otherwise it returns * {@code false}. * *

Specifically, this method tests whether the type represented by the * specified {@code Class} parameter can be converted to the type * represented by this {@code Class} object via an identity conversion * or via a widening reference conversion. See The Java Language * Specification, sections 5.1.1 and 5.1.4 , for details. * * @param cls the {@code Class} object to be checked * @return the {@code boolean} value indicating whether objects of the * type {@code cls} can be assigned to objects of this class * @exception NullPointerException if the specified Class parameter is * null. * @since JDK1.1 */ public native boolean isAssignableFrom(Class cls); /** * Determines if the specified {@code Class} object represents an * interface type. * * @return {@code true} if this object represents an interface; * {@code false} otherwise. */ public native boolean isInterface(); /** * Determines if this {@code Class} object represents an array class. * * @return {@code true} if this object represents an array class; * {@code false} otherwise. * @since JDK1.1 */ public native boolean isArray(); /** * Determines if the specified {@code Class} object represents a * primitive type. * *

There are nine predefined {@code Class} objects to represent * the eight primitive types and void. These are created by the Java * Virtual Machine, and have the same names as the primitive types that * they represent, namely {@code boolean}, {@code byte}, * {@code char}, {@code short}, {@code int}, * {@code long}, {@code float}, and {@code double}. * *

These objects may only be accessed via the following public static * final variables, and are the only {@code Class} objects for which * this method returns {@code true}. * * @return true if and only if this class represents a primitive type * * @see java.lang.Boolean#TYPE * @see java.lang.Character#TYPE * @see java.lang.Byte#TYPE * @see java.lang.Short#TYPE * @see java.lang.Integer#TYPE * @see java.lang.Long#TYPE * @see java.lang.Float#TYPE * @see java.lang.Double#TYPE * @see java.lang.Void#TYPE * @since JDK1.1 */ public native boolean isPrimitive(); /** * Returns true if this {@code Class} object represents an annotation * type. Note that if this method returns true, {@link #isInterface()} * would also return true, as all annotation types are also interfaces. * * @return {@code true} if this class object represents an annotation * type; {@code false} otherwise * @since 1.5 */ public boolean isAnnotation() { return (getModifiers() & ANNOTATION) != 0; } /** * Returns {@code true} if this class is a synthetic class; * returns {@code false} otherwise. * @return {@code true} if and only if this class is a synthetic class as * defined by the Java Language Specification. * @jls 13.1 The Form of a Binary * @since 1.5 */ public boolean isSynthetic() { return (getModifiers() & SYNTHETIC) != 0; } /** * Returns the name of the entity (class, interface, array class, * primitive type, or void) represented by this {@code Class} object, * as a {@code String}. * *

If this class object represents a reference type that is not an * array type then the binary name of the class is returned, as specified * by * The Java™ Language Specification. * *

If this class object represents a primitive type or void, then the * name returned is a {@code String} equal to the Java language * keyword corresponding to the primitive type or void. * *

If this class object represents a class of arrays, then the internal * form of the name consists of the name of the element type preceded by * one or more '{@code [}' characters representing the depth of the array * nesting. The encoding of element type names is as follows: * *

*
Element Type     Encoding *
boolean     Z *
byte     B *
char     C *
class or interface *     Lclassname; *
double     D *
float     F *
int     I *
long     J *
short     S *
* *

The class or interface name classname is the binary name of * the class specified above. * *

Examples: *

     * String.class.getName()
     *     returns "java.lang.String"
     * byte.class.getName()
     *     returns "byte"
     * (new Object[3]).getClass().getName()
     *     returns "[Ljava.lang.Object;"
     * (new int[3][4][5][6][7][8][9]).getClass().getName()
     *     returns "[[[[[[[I"
     * 
* * @return the name of the class or interface * represented by this object. */ public String getName() { String name = this.name; if (name == null) this.name = name = getName0(); return name; } // cache the name to reduce the number of calls into the VM private transient String name; private native String getName0(); /** * Returns the class loader for the class. Some implementations may use * null to represent the bootstrap class loader. This method will return * null in such implementations if this class was loaded by the bootstrap * class loader. * *

If a security manager is present, and the caller's class loader is * not null and the caller's class loader is not the same as or an ancestor of * the class loader for the class whose class loader is requested, then * this method calls the security manager's {@code checkPermission} * method with a {@code RuntimePermission("getClassLoader")} * permission to ensure it's ok to access the class loader for the class. * *

If this object * represents a primitive type or void, null is returned. * * @return the class loader that loaded the class or interface * represented by this object. * @throws SecurityException * if a security manager exists and its * {@code checkPermission} method denies * access to the class loader for the class. * @see java.lang.ClassLoader * @see SecurityManager#checkPermission * @see java.lang.RuntimePermission */ public ClassLoader getClassLoader() { ClassLoader cl = getClassLoader0(); if (cl == null) return null; SecurityManager sm = System.getSecurityManager(); if (sm != null) { ClassLoader ccl = ClassLoader.getCallerClassLoader(); if (ClassLoader.needsClassLoaderPermissionCheck(ccl, cl)) { sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); } } return cl; } // Package-private to allow ClassLoader access native ClassLoader getClassLoader0(); /** * Returns an array of {@code TypeVariable} objects that represent the * type variables declared by the generic declaration represented by this * {@code GenericDeclaration} object, in declaration order. Returns an * array of length 0 if the underlying generic declaration declares no type * variables. * * @return an array of {@code TypeVariable} objects that represent * the type variables declared by this generic declaration * @throws java.lang.reflect.GenericSignatureFormatError if the generic * signature of this generic declaration does not conform to * the format specified in * The Java™ Virtual Machine Specification * @since 1.5 */ @SuppressWarnings("unchecked") public TypeVariable>[] getTypeParameters() { if (getGenericSignature() != null) return (TypeVariable>[])getGenericInfo().getTypeParameters(); else return (TypeVariable>[])new TypeVariable[0]; } /** * Returns the {@code Class} representing the superclass of the entity * (class, interface, primitive type or void) represented by this * {@code Class}. If this {@code Class} represents either the * {@code Object} class, an interface, a primitive type, or void, then * null is returned. If this object represents an array class then the * {@code Class} object representing the {@code Object} class is * returned. * * @return the superclass of the class represented by this object. */ public native Class getSuperclass(); /** * Returns the {@code Type} representing the direct superclass of * the entity (class, interface, primitive type or void) represented by * this {@code Class}. * *

If the superclass is a parameterized type, the {@code Type} * object returned must accurately reflect the actual type * parameters used in the source code. The parameterized type * representing the superclass is created if it had not been * created before. See the declaration of {@link * java.lang.reflect.ParameterizedType ParameterizedType} for the * semantics of the creation process for parameterized types. If * this {@code Class} represents either the {@code Object} * class, an interface, a primitive type, or void, then null is * returned. If this object represents an array class then the * {@code Class} object representing the {@code Object} class is * returned. * * @throws java.lang.reflect.GenericSignatureFormatError if the generic * class signature does not conform to the format specified in * The Java™ Virtual Machine Specification * @throws TypeNotPresentException if the generic superclass * refers to a non-existent type declaration * @throws java.lang.reflect.MalformedParameterizedTypeException if the * generic superclass refers to a parameterized type that cannot be * instantiated for any reason * @return the superclass of the class represented by this object * @since 1.5 */ public Type getGenericSuperclass() { if (getGenericSignature() != null) { // Historical irregularity: // Generic signature marks interfaces with superclass = Object // but this API returns null for interfaces if (isInterface()) return null; return getGenericInfo().getSuperclass(); } else return getSuperclass(); } /** * Gets the package for this class. The class loader of this class is used * to find the package. If the class was loaded by the bootstrap class * loader the set of packages loaded from CLASSPATH is searched to find the * package of the class. Null is returned if no package object was created * by the class loader of this class. * *

Packages have attributes for versions and specifications only if the * information was defined in the manifests that accompany the classes, and * if the class loader created the package instance with the attributes * from the manifest. * * @return the package of the class, or null if no package * information is available from the archive or codebase. */ public Package getPackage() { return Package.getPackage(this); } /** * Determines the interfaces implemented by the class or interface * represented by this object. * *

If this object represents a class, the return value is an array * containing objects representing all interfaces implemented by the * class. The order of the interface objects in the array corresponds to * the order of the interface names in the {@code implements} clause * of the declaration of the class represented by this object. For * example, given the declaration: *

* {@code class Shimmer implements FloorWax, DessertTopping { ... }} *
* suppose the value of {@code s} is an instance of * {@code Shimmer}; the value of the expression: *
* {@code s.getClass().getInterfaces()[0]} *
* is the {@code Class} object that represents interface * {@code FloorWax}; and the value of: *
* {@code s.getClass().getInterfaces()[1]} *
* is the {@code Class} object that represents interface * {@code DessertTopping}. * *

If this object represents an interface, the array contains objects * representing all interfaces extended by the interface. The order of the * interface objects in the array corresponds to the order of the interface * names in the {@code extends} clause of the declaration of the * interface represented by this object. * *

If this object represents a class or interface that implements no * interfaces, the method returns an array of length 0. * *

If this object represents a primitive type or void, the method * returns an array of length 0. * * @return an array of interfaces implemented by this class. */ public native Class[] getInterfaces(); /** * Returns the {@code Type}s representing the interfaces * directly implemented by the class or interface represented by * this object. * *

If a superinterface is a parameterized type, the * {@code Type} object returned for it must accurately reflect * the actual type parameters used in the source code. The * parameterized type representing each superinterface is created * if it had not been created before. See the declaration of * {@link java.lang.reflect.ParameterizedType ParameterizedType} * for the semantics of the creation process for parameterized * types. * *

If this object represents a class, the return value is an * array containing objects representing all interfaces * implemented by the class. The order of the interface objects in * the array corresponds to the order of the interface names in * the {@code implements} clause of the declaration of the class * represented by this object. In the case of an array class, the * interfaces {@code Cloneable} and {@code Serializable} are * returned in that order. * *

If this object represents an interface, the array contains * objects representing all interfaces directly extended by the * interface. The order of the interface objects in the array * corresponds to the order of the interface names in the * {@code extends} clause of the declaration of the interface * represented by this object. * *

If this object represents a class or interface that * implements no interfaces, the method returns an array of length * 0. * *

If this object represents a primitive type or void, the * method returns an array of length 0. * * @throws java.lang.reflect.GenericSignatureFormatError * if the generic class signature does not conform to the format * specified in * The Java™ Virtual Machine Specification * @throws TypeNotPresentException if any of the generic * superinterfaces refers to a non-existent type declaration * @throws java.lang.reflect.MalformedParameterizedTypeException * if any of the generic superinterfaces refer to a parameterized * type that cannot be instantiated for any reason * @return an array of interfaces implemented by this class * @since 1.5 */ public Type[] getGenericInterfaces() { if (getGenericSignature() != null) return getGenericInfo().getSuperInterfaces(); else return getInterfaces(); } /** * Returns the {@code Class} representing the component type of an * array. If this class does not represent an array class this method * returns null. * * @return the {@code Class} representing the component type of this * class if this class is an array * @see java.lang.reflect.Array * @since JDK1.1 */ public native Class getComponentType(); /** * Returns the Java language modifiers for this class or interface, encoded * in an integer. The modifiers consist of the Java Virtual Machine's * constants for {@code public}, {@code protected}, * {@code private}, {@code final}, {@code static}, * {@code abstract} and {@code interface}; they should be decoded * using the methods of class {@code Modifier}. * *

If the underlying class is an array class, then its * {@code public}, {@code private} and {@code protected} * modifiers are the same as those of its component type. If this * {@code Class} represents a primitive type or void, its * {@code public} modifier is always {@code true}, and its * {@code protected} and {@code private} modifiers are always * {@code false}. If this object represents an array class, a * primitive type or void, then its {@code final} modifier is always * {@code true} and its interface modifier is always * {@code false}. The values of its other modifiers are not determined * by this specification. * *

The modifier encodings are defined in The Java Virtual Machine * Specification, table 4.1. * * @return the {@code int} representing the modifiers for this class * @see java.lang.reflect.Modifier * @since JDK1.1 */ public native int getModifiers(); /** * Gets the signers of this class. * * @return the signers of this class, or null if there are no signers. In * particular, this method returns null if this object represents * a primitive type or void. * @since JDK1.1 */ public native Object[] getSigners(); /** * Set the signers of this class. */ native void setSigners(Object[] signers); /** * If this {@code Class} object represents a local or anonymous * class within a method, returns a {@link * java.lang.reflect.Method Method} object representing the * immediately enclosing method of the underlying class. Returns * {@code null} otherwise. * * In particular, this method returns {@code null} if the underlying * class is a local or anonymous class immediately enclosed by a type * declaration, instance initializer or static initializer. * * @return the immediately enclosing method of the underlying class, if * that class is a local or anonymous class; otherwise {@code null}. * @since 1.5 */ public Method getEnclosingMethod() { EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); if (enclosingInfo == null) return null; else { if (!enclosingInfo.isMethod()) return null; MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(), getFactory()); Class returnType = toClass(typeInfo.getReturnType()); Type [] parameterTypes = typeInfo.getParameterTypes(); Class[] parameterClasses = new Class[parameterTypes.length]; // Convert Types to Classes; returned types *should* // be class objects since the methodDescriptor's used // don't have generics information for(int i = 0; i < parameterClasses.length; i++) parameterClasses[i] = toClass(parameterTypes[i]); /* * Loop over all declared methods; match method name, * number of and type of parameters, *and* return * type. Matching return type is also necessary * because of covariant returns, etc. */ for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) { if (m.getName().equals(enclosingInfo.getName()) ) { Class[] candidateParamClasses = m.getParameterTypes(); if (candidateParamClasses.length == parameterClasses.length) { boolean matches = true; for(int i = 0; i < candidateParamClasses.length; i++) { if (!candidateParamClasses[i].equals(parameterClasses[i])) { matches = false; break; } } if (matches) { // finally, check return type if (m.getReturnType().equals(returnType) ) return m; } } } } throw new InternalError("Enclosing method not found"); } } private native Object[] getEnclosingMethod0(); private EnclosingMethodInfo getEnclosingMethodInfo() { Object[] enclosingInfo = getEnclosingMethod0(); if (enclosingInfo == null) return null; else { return new EnclosingMethodInfo(enclosingInfo); } } private final static class EnclosingMethodInfo { private Class enclosingClass; private String name; private String descriptor; private EnclosingMethodInfo(Object[] enclosingInfo) { if (enclosingInfo.length != 3) throw new InternalError("Malformed enclosing method information"); try { // The array is expected to have three elements: // the immediately enclosing class enclosingClass = (Class) enclosingInfo[0]; assert(enclosingClass != null); // the immediately enclosing method or constructor's // name (can be null). name = (String) enclosingInfo[1]; // the immediately enclosing method or constructor's // descriptor (null iff name is). descriptor = (String) enclosingInfo[2]; assert((name != null && descriptor != null) || name == descriptor); } catch (ClassCastException cce) { throw new InternalError("Invalid type in enclosing method information", cce); } } boolean isPartial() { return enclosingClass == null || name == null || descriptor == null; } boolean isConstructor() { return !isPartial() && "".equals(name); } boolean isMethod() { return !isPartial() && !isConstructor() && !"".equals(name); } Class getEnclosingClass() { return enclosingClass; } String getName() { return name; } String getDescriptor() { return descriptor; } } private static Class toClass(Type o) { if (o instanceof GenericArrayType) return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()), 0) .getClass(); return (Class)o; } /** * If this {@code Class} object represents a local or anonymous * class within a constructor, returns a {@link * java.lang.reflect.Constructor Constructor} object representing * the immediately enclosing constructor of the underlying * class. Returns {@code null} otherwise. In particular, this * method returns {@code null} if the underlying class is a local * or anonymous class immediately enclosed by a type declaration, * instance initializer or static initializer. * * @return the immediately enclosing constructor of the underlying class, if * that class is a local or anonymous class; otherwise {@code null}. * @since 1.5 */ public Constructor getEnclosingConstructor() { EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); if (enclosingInfo == null) return null; else { if (!enclosingInfo.isConstructor()) return null; ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(), getFactory()); Type [] parameterTypes = typeInfo.getParameterTypes(); Class[] parameterClasses = new Class[parameterTypes.length]; // Convert Types to Classes; returned types *should* // be class objects since the methodDescriptor's used // don't have generics information for(int i = 0; i < parameterClasses.length; i++) parameterClasses[i] = toClass(parameterTypes[i]); /* * Loop over all declared constructors; match number * of and type of parameters. */ for(Constructor c: enclosingInfo.getEnclosingClass().getDeclaredConstructors()) { Class[] candidateParamClasses = c.getParameterTypes(); if (candidateParamClasses.length == parameterClasses.length) { boolean matches = true; for(int i = 0; i < candidateParamClasses.length; i++) { if (!candidateParamClasses[i].equals(parameterClasses[i])) { matches = false; break; } } if (matches) return c; } } throw new InternalError("Enclosing constructor not found"); } } /** * If the class or interface represented by this {@code Class} object * is a member of another class, returns the {@code Class} object * representing the class in which it was declared. This method returns * null if this class or interface is not a member of any other class. If * this {@code Class} object represents an array class, a primitive * type, or void,then this method returns null. * * @return the declaring class for this class * @since JDK1.1 */ public native Class getDeclaringClass(); /** * Returns the immediately enclosing class of the underlying * class. If the underlying class is a top level class this * method returns {@code null}. * @return the immediately enclosing class of the underlying class * @since 1.5 */ public Class getEnclosingClass() { // There are five kinds of classes (or interfaces): // a) Top level classes // b) Nested classes (static member classes) // c) Inner classes (non-static member classes) // d) Local classes (named classes declared within a method) // e) Anonymous classes // JVM Spec 4.8.6: A class must have an EnclosingMethod // attribute if and only if it is a local class or an // anonymous class. EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); if (enclosingInfo == null) { // This is a top level or a nested class or an inner class (a, b, or c) return getDeclaringClass(); } else { Class enclosingClass = enclosingInfo.getEnclosingClass(); // This is a local class or an anonymous class (d or e) if (enclosingClass == this || enclosingClass == null) throw new InternalError("Malformed enclosing method information"); else return enclosingClass; } } /** * Returns the simple name of the underlying class as given in the * source code. Returns an empty string if the underlying class is * anonymous. * *

The simple name of an array is the simple name of the * component type with "[]" appended. In particular the simple * name of an array whose component type is anonymous is "[]". * * @return the simple name of the underlying class * @since 1.5 */ public String getSimpleName() { if (isArray()) return getComponentType().getSimpleName()+"[]"; String simpleName = getSimpleBinaryName(); if (simpleName == null) { // top level class simpleName = getName(); return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name } // According to JLS3 "Binary Compatibility" (13.1) the binary // name of non-package classes (not top level) is the binary // name of the immediately enclosing class followed by a '$' followed by: // (for nested and inner classes): the simple name. // (for local classes): 1 or more digits followed by the simple name. // (for anonymous classes): 1 or more digits. // Since getSimpleBinaryName() will strip the binary name of // the immediatly enclosing class, we are now looking at a // string that matches the regular expression "\$[0-9]*" // followed by a simple name (considering the simple of an // anonymous class to be the empty string). // Remove leading "\$[0-9]*" from the name int length = simpleName.length(); if (length < 1 || simpleName.charAt(0) != '$') throw new InternalError("Malformed class name"); int index = 1; while (index < length && isAsciiDigit(simpleName.charAt(index))) index++; // Eventually, this is the empty string iff this is an anonymous class return simpleName.substring(index); } /** * Character.isDigit answers {@code true} to some non-ascii * digits. This one does not. */ private static boolean isAsciiDigit(char c) { return '0' <= c && c <= '9'; } /** * Returns the canonical name of the underlying class as * defined by the Java Language Specification. Returns null if * the underlying class does not have a canonical name (i.e., if * it is a local or anonymous class or an array whose component * type does not have a canonical name). * @return the canonical name of the underlying class if it exists, and * {@code null} otherwise. * @since 1.5 */ public String getCanonicalName() { if (isArray()) { String canonicalName = getComponentType().getCanonicalName(); if (canonicalName != null) return canonicalName + "[]"; else return null; } if (isLocalOrAnonymousClass()) return null; Class enclosingClass = getEnclosingClass(); if (enclosingClass == null) { // top level class return getName(); } else { String enclosingName = enclosingClass.getCanonicalName(); if (enclosingName == null) return null; return enclosingName + "." + getSimpleName(); } } /** * Returns {@code true} if and only if the underlying class * is an anonymous class. * * @return {@code true} if and only if this class is an anonymous class. * @since 1.5 */ public boolean isAnonymousClass() { return "".equals(getSimpleName()); } /** * Returns {@code true} if and only if the underlying class * is a local class. * * @return {@code true} if and only if this class is a local class. * @since 1.5 */ public boolean isLocalClass() { return isLocalOrAnonymousClass() && !isAnonymousClass(); } /** * Returns {@code true} if and only if the underlying class * is a member class. * * @return {@code true} if and only if this class is a member class. * @since 1.5 */ public boolean isMemberClass() { return getSimpleBinaryName() != null && !isLocalOrAnonymousClass(); } /** * Returns the "simple binary name" of the underlying class, i.e., * the binary name without the leading enclosing class name. * Returns {@code null} if the underlying class is a top level * class. */ private String getSimpleBinaryName() { Class enclosingClass = getEnclosingClass(); if (enclosingClass == null) // top level class return null; // Otherwise, strip the enclosing class' name try { return getName().substring(enclosingClass.getName().length()); } catch (IndexOutOfBoundsException ex) { throw new InternalError("Malformed class name", ex); } } /** * Returns {@code true} if this is a local class or an anonymous * class. Returns {@code false} otherwise. */ private boolean isLocalOrAnonymousClass() { // JVM Spec 4.8.6: A class must have an EnclosingMethod // attribute if and only if it is a local class or an // anonymous class. return getEnclosingMethodInfo() != null; } /** * Returns an array containing {@code Class} objects representing all * the public classes and interfaces that are members of the class * represented by this {@code Class} object. This includes public * class and interface members inherited from superclasses and public class * and interface members declared by the class. This method returns an * array of length 0 if this {@code Class} object has no public member * classes or interfaces. This method also returns an array of length 0 if * this {@code Class} object represents a primitive type, an array * class, or void. * * @return the array of {@code Class} objects representing the public * members of this class * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} method * denies access to the classes within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Class[] getClasses() { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); // Privileged so this implementation can look at DECLARED classes, // something the caller might not have privilege to do. The code here // is allowed to look at DECLARED classes because (1) it does not hand // out anything other than public members and (2) public member access // has already been ok'd by the SecurityManager. return java.security.AccessController.doPrivileged( new java.security.PrivilegedAction[]>() { public Class[] run() { List> list = new ArrayList<>(); Class currentClass = Class.this; while (currentClass != null) { Class[] members = currentClass.getDeclaredClasses(); for (int i = 0; i < members.length; i++) { if (Modifier.isPublic(members[i].getModifiers())) { list.add(members[i]); } } currentClass = currentClass.getSuperclass(); } return list.toArray(new Class[0]); } }); } /** * Returns an array containing {@code Field} objects reflecting all * the accessible public fields of the class or interface represented by * this {@code Class} object. The elements in the array returned are * not sorted and are not in any particular order. This method returns an * array of length 0 if the class or interface has no accessible public * fields, or if it represents an array class, a primitive type, or void. * *

Specifically, if this {@code Class} object represents a class, * this method returns the public fields of this class and of all its * superclasses. If this {@code Class} object represents an * interface, this method returns the fields of this interface and of all * its superinterfaces. * *

The implicit length field for array class is not reflected by this * method. User code should use the methods of class {@code Array} to * manipulate arrays. * *

See The Java Language Specification, sections 8.2 and 8.3. * * @return the array of {@code Field} objects representing the * public fields * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} denies * access to the fields within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Field[] getFields() throws SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); return copyFields(privateGetPublicFields(null)); } /** * Returns an array containing {@code Method} objects reflecting all * the public member methods of the class or interface represented * by this {@code Class} object, including those declared by the class * or interface and those inherited from superclasses and * superinterfaces. Array classes return all the (public) member methods * inherited from the {@code Object} class. The elements in the array * returned are not sorted and are not in any particular order. This * method returns an array of length 0 if this {@code Class} object * represents a class or interface that has no public member methods, or if * this {@code Class} object represents a primitive type or void. * *

The class initialization method {@code } is not * included in the returned array. If the class declares multiple public * member methods with the same parameter types, they are all included in * the returned array. * *

See The Java Language Specification, sections 8.2 and 8.4. * * @return the array of {@code Method} objects representing the * public methods of this class * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} denies * access to the methods within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Method[] getMethods() throws SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); return copyMethods(privateGetPublicMethods()); } /** * Returns an array containing {@code Constructor} objects reflecting * all the public constructors of the class represented by this * {@code Class} object. An array of length 0 is returned if the * class has no public constructors, or if the class is an array class, or * if the class reflects a primitive type or void. * * Note that while this method returns an array of {@code * Constructor} objects (that is an array of constructors from * this class), the return type of this method is {@code * Constructor[]} and not {@code Constructor[]} as * might be expected. This less informative return type is * necessary since after being returned from this method, the * array could be modified to hold {@code Constructor} objects for * different classes, which would violate the type guarantees of * {@code Constructor[]}. * * @return the array of {@code Constructor} objects representing the * public constructors of this class * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *
    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} denies * access to the constructors within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Constructor[] getConstructors() throws SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); return copyConstructors(privateGetDeclaredConstructors(true)); } /** * Returns a {@code Field} object that reflects the specified public * member field of the class or interface represented by this * {@code Class} object. The {@code name} parameter is a * {@code String} specifying the simple name of the desired field. * *

The field to be reflected is determined by the algorithm that * follows. Let C be the class represented by this object: *

    *
  1. If C declares a public field with the name specified, that is the * field to be reflected.
  2. *
  3. If no field was found in step 1 above, this algorithm is applied * recursively to each direct superinterface of C. The direct * superinterfaces are searched in the order they were declared.
  4. *
  5. If no field was found in steps 1 and 2 above, and C has a * superclass S, then this algorithm is invoked recursively upon S. * If C has no superclass, then a {@code NoSuchFieldException} * is thrown.
  6. *
* *

See The Java Language Specification, sections 8.2 and 8.3. * * @param name the field name * @return the {@code Field} object of this class specified by * {@code name} * @exception NoSuchFieldException if a field with the specified name is * not found. * @exception NullPointerException if {@code name} is {@code null} * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} denies * access to the field * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Field getField(String name) throws NoSuchFieldException, SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); Field field = getField0(name); if (field == null) { throw new NoSuchFieldException(name); } return field; } /** * Returns a {@code Method} object that reflects the specified public * member method of the class or interface represented by this * {@code Class} object. The {@code name} parameter is a * {@code String} specifying the simple name of the desired method. The * {@code parameterTypes} parameter is an array of {@code Class} * objects that identify the method's formal parameter types, in declared * order. If {@code parameterTypes} is {@code null}, it is * treated as if it were an empty array. * *

If the {@code name} is "{@code };"or "{@code }" a * {@code NoSuchMethodException} is raised. Otherwise, the method to * be reflected is determined by the algorithm that follows. Let C be the * class represented by this object: *

    *
  1. C is searched for any matching methods. If no matching * method is found, the algorithm of step 1 is invoked recursively on * the superclass of C.
  2. *
  3. If no method was found in step 1 above, the superinterfaces of C * are searched for a matching method. If any such method is found, it * is reflected.
  4. *
* * To find a matching method in a class C:  If C declares exactly one * public method with the specified name and exactly the same formal * parameter types, that is the method reflected. If more than one such * method is found in C, and one of these methods has a return type that is * more specific than any of the others, that method is reflected; * otherwise one of the methods is chosen arbitrarily. * *

Note that there may be more than one matching method in a * class because while the Java language forbids a class to * declare multiple methods with the same signature but different * return types, the Java virtual machine does not. This * increased flexibility in the virtual machine can be used to * implement various language features. For example, covariant * returns can be implemented with {@linkplain * java.lang.reflect.Method#isBridge bridge methods}; the bridge * method and the method being overridden would have the same * signature but different return types. * *

See The Java Language Specification, sections 8.2 and 8.4. * * @param name the name of the method * @param parameterTypes the list of parameters * @return the {@code Method} object that matches the specified * {@code name} and {@code parameterTypes} * @exception NoSuchMethodException if a matching method is not found * or if the name is "<init>"or "<clinit>". * @exception NullPointerException if {@code name} is {@code null} * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} denies * access to the method * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Method getMethod(String name, Class... parameterTypes) throws NoSuchMethodException, SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); Method method = getMethod0(name, parameterTypes); if (method == null) { throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); } return method; } /** * Returns a {@code Constructor} object that reflects the specified * public constructor of the class represented by this {@code Class} * object. The {@code parameterTypes} parameter is an array of * {@code Class} objects that identify the constructor's formal * parameter types, in declared order. * * If this {@code Class} object represents an inner class * declared in a non-static context, the formal parameter types * include the explicit enclosing instance as the first parameter. * *

The constructor to reflect is the public constructor of the class * represented by this {@code Class} object whose formal parameter * types match those specified by {@code parameterTypes}. * * @param parameterTypes the parameter array * @return the {@code Constructor} object of the public constructor that * matches the specified {@code parameterTypes} * @exception NoSuchMethodException if a matching method is not found. * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.PUBLIC)} denies * access to the constructor * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Constructor getConstructor(Class... parameterTypes) throws NoSuchMethodException, SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); return getConstructor0(parameterTypes, Member.PUBLIC); } /** * Returns an array of {@code Class} objects reflecting all the * classes and interfaces declared as members of the class represented by * this {@code Class} object. This includes public, protected, default * (package) access, and private classes and interfaces declared by the * class, but excludes inherited classes and interfaces. This method * returns an array of length 0 if the class declares no classes or * interfaces as members, or if this {@code Class} object represents a * primitive type, an array class, or void. * * @return the array of {@code Class} objects representing all the * declared members of this class * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *
    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.DECLARED)} denies * access to the declared classes within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Class[] getDeclaredClasses() throws SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); return getDeclaredClasses0(); } /** * Returns an array of {@code Field} objects reflecting all the fields * declared by the class or interface represented by this * {@code Class} object. This includes public, protected, default * (package) access, and private fields, but excludes inherited fields. * The elements in the array returned are not sorted and are not in any * particular order. This method returns an array of length 0 if the class * or interface declares no fields, or if this {@code Class} object * represents a primitive type, an array class, or void. * *

See The Java Language Specification, sections 8.2 and 8.3. * * @return the array of {@code Field} objects representing all the * declared fields of this class * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.DECLARED)} denies * access to the declared fields within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Field[] getDeclaredFields() throws SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); return copyFields(privateGetDeclaredFields(false)); } /** * Returns an array of {@code Method} objects reflecting all the * methods declared by the class or interface represented by this * {@code Class} object. This includes public, protected, default * (package) access, and private methods, but excludes inherited methods. * The elements in the array returned are not sorted and are not in any * particular order. This method returns an array of length 0 if the class * or interface declares no methods, or if this {@code Class} object * represents a primitive type, an array class, or void. The class * initialization method {@code } is not included in the * returned array. If the class declares multiple public member methods * with the same parameter types, they are all included in the returned * array. * *

See The Java Language Specification, section 8.2. * * @return the array of {@code Method} objects representing all the * declared methods of this class * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.DECLARED)} denies * access to the declared methods within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Method[] getDeclaredMethods() throws SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); return copyMethods(privateGetDeclaredMethods(false)); } /** * Returns an array of {@code Constructor} objects reflecting all the * constructors declared by the class represented by this * {@code Class} object. These are public, protected, default * (package) access, and private constructors. The elements in the array * returned are not sorted and are not in any particular order. If the * class has a default constructor, it is included in the returned array. * This method returns an array of length 0 if this {@code Class} * object represents an interface, a primitive type, an array class, or * void. * *

See The Java Language Specification, section 8.2. * * @return the array of {@code Constructor} objects representing all the * declared constructors of this class * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *

    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.DECLARED)} denies * access to the declared constructors within this class * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Constructor[] getDeclaredConstructors() throws SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); return copyConstructors(privateGetDeclaredConstructors(false)); } /** * Returns a {@code Field} object that reflects the specified declared * field of the class or interface represented by this {@code Class} * object. The {@code name} parameter is a {@code String} that * specifies the simple name of the desired field. Note that this method * will not reflect the {@code length} field of an array class. * * @param name the name of the field * @return the {@code Field} object for the specified field in this * class * @exception NoSuchFieldException if a field with the specified name is * not found. * @exception NullPointerException if {@code name} is {@code null} * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *
    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.DECLARED)} denies * access to the declared field * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Field getDeclaredField(String name) throws NoSuchFieldException, SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); Field field = searchFields(privateGetDeclaredFields(false), name); if (field == null) { throw new NoSuchFieldException(name); } return field; } /** * Returns a {@code Method} object that reflects the specified * declared method of the class or interface represented by this * {@code Class} object. The {@code name} parameter is a * {@code String} that specifies the simple name of the desired * method, and the {@code parameterTypes} parameter is an array of * {@code Class} objects that identify the method's formal parameter * types, in declared order. If more than one method with the same * parameter types is declared in a class, and one of these methods has a * return type that is more specific than any of the others, that method is * returned; otherwise one of the methods is chosen arbitrarily. If the * name is "<init>"or "<clinit>" a {@code NoSuchMethodException} * is raised. * * @param name the name of the method * @param parameterTypes the parameter array * @return the {@code Method} object for the method of this class * matching the specified name and parameters * @exception NoSuchMethodException if a matching method is not found. * @exception NullPointerException if {@code name} is {@code null} * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *
    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.DECLARED)} denies * access to the declared method * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Method getDeclaredMethod(String name, Class... parameterTypes) throws NoSuchMethodException, SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); if (method == null) { throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); } return method; } /** * Returns a {@code Constructor} object that reflects the specified * constructor of the class or interface represented by this * {@code Class} object. The {@code parameterTypes} parameter is * an array of {@code Class} objects that identify the constructor's * formal parameter types, in declared order. * * If this {@code Class} object represents an inner class * declared in a non-static context, the formal parameter types * include the explicit enclosing instance as the first parameter. * * @param parameterTypes the parameter array * @return The {@code Constructor} object for the constructor with the * specified parameter list * @exception NoSuchMethodException if a matching method is not found. * @exception SecurityException * If a security manager, s, is present and any of the * following conditions is met: * *
    * *
  • invocation of * {@link SecurityManager#checkMemberAccess * s.checkMemberAccess(this, Member.DECLARED)} denies * access to the declared constructor * *
  • the caller's class loader is not the same as or an * ancestor of the class loader for the current class and * invocation of {@link SecurityManager#checkPackageAccess * s.checkPackageAccess()} denies access to the package * of this class * *
* * @since JDK1.1 */ public Constructor getDeclaredConstructor(Class... parameterTypes) throws NoSuchMethodException, SecurityException { // be very careful not to change the stack depth of this // checkMemberAccess call for security reasons // see java.lang.SecurityManager.checkMemberAccess checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); return getConstructor0(parameterTypes, Member.DECLARED); } /** * Finds a resource with a given name. The rules for searching resources * associated with a given class are implemented by the defining * {@linkplain ClassLoader class loader} of the class. This method * delegates to this object's class loader. If this object was loaded by * the bootstrap class loader, the method delegates to {@link * ClassLoader#getSystemResourceAsStream}. * *

Before delegation, an absolute resource name is constructed from the * given resource name using this algorithm: * *

    * *
  • If the {@code name} begins with a {@code '/'} * ('\u002f'), then the absolute name of the resource is the * portion of the {@code name} following the {@code '/'}. * *
  • Otherwise, the absolute name is of the following form: * *
    * {@code modified_package_name/name} *
    * *

    Where the {@code modified_package_name} is the package name of this * object with {@code '/'} substituted for {@code '.'} * ('\u002e'). * *

* * @param name name of the desired resource * @return A {@link java.io.InputStream} object or {@code null} if * no resource with this name is found * @throws NullPointerException If {@code name} is {@code null} * @since JDK1.1 */ public InputStream getResourceAsStream(String name) { name = resolveName(name); ClassLoader cl = getClassLoader0(); if (cl==null) { // A system class. return ClassLoader.getSystemResourceAsStream(name); } return cl.getResourceAsStream(name); } /** * Finds a resource with a given name. The rules for searching resources * associated with a given class are implemented by the defining * {@linkplain ClassLoader class loader} of the class. This method * delegates to this object's class loader. If this object was loaded by * the bootstrap class loader, the method delegates to {@link * ClassLoader#getSystemResource}. * *

Before delegation, an absolute resource name is constructed from the * given resource name using this algorithm: * *

    * *
  • If the {@code name} begins with a {@code '/'} * ('\u002f'), then the absolute name of the resource is the * portion of the {@code name} following the {@code '/'}. * *
  • Otherwise, the absolute name is of the following form: * *
    * {@code modified_package_name/name} *
    * *

    Where the {@code modified_package_name} is the package name of this * object with {@code '/'} substituted for {@code '.'} * ('\u002e'). * *

* * @param name name of the desired resource * @return A {@link java.net.URL} object or {@code null} if no * resource with this name is found * @since JDK1.1 */ public java.net.URL getResource(String name) { name = resolveName(name); ClassLoader cl = getClassLoader0(); if (cl==null) { // A system class. return ClassLoader.getSystemResource(name); } return cl.getResource(name); } /** protection domain returned when the internal domain is null */ private static java.security.ProtectionDomain allPermDomain; /** * Returns the {@code ProtectionDomain} of this class. If there is a * security manager installed, this method first calls the security * manager's {@code checkPermission} method with a * {@code RuntimePermission("getProtectionDomain")} permission to * ensure it's ok to get the * {@code ProtectionDomain}. * * @return the ProtectionDomain of this class * * @throws SecurityException * if a security manager exists and its * {@code checkPermission} method doesn't allow * getting the ProtectionDomain. * * @see java.security.ProtectionDomain * @see SecurityManager#checkPermission * @see java.lang.RuntimePermission * @since 1.2 */ public java.security.ProtectionDomain getProtectionDomain() { SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPermission(SecurityConstants.GET_PD_PERMISSION); } java.security.ProtectionDomain pd = getProtectionDomain0(); if (pd == null) { if (allPermDomain == null) { java.security.Permissions perms = new java.security.Permissions(); perms.add(SecurityConstants.ALL_PERMISSION); allPermDomain = new java.security.ProtectionDomain(null, perms); } pd = allPermDomain; } return pd; } /** * Returns the ProtectionDomain of this class. */ private native java.security.ProtectionDomain getProtectionDomain0(); /** * Set the ProtectionDomain for this class. Called by * ClassLoader.defineClass. */ native void setProtectionDomain0(java.security.ProtectionDomain pd); /* * Return the Virtual Machine's Class object for the named * primitive type. */ static native Class getPrimitiveClass(String name); /* * Check if client is allowed to access members. If access is denied, * throw a SecurityException. * * Be very careful not to change the stack depth of this checkMemberAccess * call for security reasons. * See java.lang.SecurityManager.checkMemberAccess. * *

Default policy: allow all clients access with normal Java access * control. */ private void checkMemberAccess(int which, ClassLoader ccl) { SecurityManager s = System.getSecurityManager(); if (s != null) { s.checkMemberAccess(this, which); ClassLoader cl = getClassLoader0(); if (sun.reflect.misc.ReflectUtil.needsPackageAccessCheck(ccl, cl)) { String name = this.getName(); int i = name.lastIndexOf('.'); if (i != -1) { s.checkPackageAccess(name.substring(0, i)); } } } } /** * Add a package name prefix if the name is not absolute Remove leading "/" * if name is absolute */ private String resolveName(String name) { if (name == null) { return name; } if (!name.startsWith("/")) { Class c = this; while (c.isArray()) { c = c.getComponentType(); } String baseName = c.getName(); int index = baseName.lastIndexOf('.'); if (index != -1) { name = baseName.substring(0, index).replace('.', '/') +"/"+name; } } else { name = name.substring(1); } return name; } /** * Reflection support. */ // Caches for certain reflective results private static boolean useCaches = true; // reflection data that might get invalidated when JVM TI RedefineClasses() is called static class ReflectionData { volatile Field[] declaredFields; volatile Field[] publicFields; volatile Method[] declaredMethods; volatile Method[] publicMethods; volatile Constructor[] declaredConstructors; volatile Constructor[] publicConstructors; // Intermediate results for getFields and getMethods volatile Field[] declaredPublicFields; volatile Method[] declaredPublicMethods; // Value of classRedefinedCount when we created this ReflectionData instance final int redefinedCount; ReflectionData(int redefinedCount) { this.redefinedCount = redefinedCount; } // initialize Unsafe machinery here, since we need to call Class.class instance method // and have to avoid calling it in the static initializer of the Class class... private static final Unsafe unsafe; // offset of Class.reflectionData instance field private static final long reflectionDataOffset; static { unsafe = Unsafe.getUnsafe(); // bypass caches Field reflectionDataField = searchFields(Class.class.getDeclaredFields0(false), "reflectionData"); if (reflectionDataField == null) { throw new Error("No reflectionData field found in java.lang.Class"); } reflectionDataOffset = unsafe.objectFieldOffset(reflectionDataField); } static boolean compareAndSwap(Class clazz, SoftReference> oldData, SoftReference> newData) { return unsafe.compareAndSwapObject(clazz, reflectionDataOffset, oldData, newData); } } private volatile transient SoftReference> reflectionData; // Incremented by the VM on each call to JVM TI RedefineClasses() // that redefines this class or a superclass. private volatile transient int classRedefinedCount = 0; // Lazily create and cache ReflectionData private ReflectionData reflectionData() { SoftReference> reflectionData = this.reflectionData; int classRedefinedCount = this.classRedefinedCount; ReflectionData rd; if (useCaches && reflectionData != null && (rd = reflectionData.get()) != null && rd.redefinedCount == classRedefinedCount) { return rd; } // else no SoftReference or cleared SoftReference or stale ReflectionData // -> create and replace new instance return newReflectionData(reflectionData, classRedefinedCount); } private ReflectionData newReflectionData(SoftReference> oldReflectionData, int classRedefinedCount) { if (!useCaches) return null; while (true) { ReflectionData rd = new ReflectionData<>(classRedefinedCount); // try to CAS it... if (ReflectionData.compareAndSwap(this, oldReflectionData, new SoftReference<>(rd))) { return rd; } // else retry oldReflectionData = this.reflectionData; classRedefinedCount = this.classRedefinedCount; if (oldReflectionData != null && (rd = oldReflectionData.get()) != null && rd.redefinedCount == classRedefinedCount) { return rd; } } } // Generic signature handling private native String getGenericSignature(); // Generic info repository; lazily initialized private transient ClassRepository genericInfo; // accessor for factory private GenericsFactory getFactory() { // create scope and factory return CoreReflectionFactory.make(this, ClassScope.make(this)); } // accessor for generic info repository private ClassRepository getGenericInfo() { // lazily initialize repository if necessary if (genericInfo == null) { // create and cache generic info repository genericInfo = ClassRepository.make(getGenericSignature(), getFactory()); } return genericInfo; //return cached repository } // Annotations handling private native byte[] getRawAnnotations(); // Since 1.8 native byte[] getRawTypeAnnotations(); static byte[] getExecutableTypeAnnotationBytes(Executable ex) { return getReflectionFactory().getExecutableTypeAnnotationBytes(ex); } native ConstantPool getConstantPool(); // // // java.lang.reflect.Field handling // // // Returns an array of "root" fields. These Field objects must NOT // be propagated to the outside world, but must instead be copied // via ReflectionFactory.copyField. private Field[] privateGetDeclaredFields(boolean publicOnly) { checkInitted(); Field[] res; ReflectionData rd = reflectionData(); if (rd != null) { res = publicOnly ? rd.declaredPublicFields : rd.declaredFields; if (res != null) return res; } // No cached value available; request value from VM res = Reflection.filterFields(this, getDeclaredFields0(publicOnly)); if (rd != null) { if (publicOnly) { rd.declaredPublicFields = res; } else { rd.declaredFields = res; } } return res; } // Returns an array of "root" fields. These Field objects must NOT // be propagated to the outside world, but must instead be copied // via ReflectionFactory.copyField. private Field[] privateGetPublicFields(Set> traversedInterfaces) { checkInitted(); Field[] res; ReflectionData rd = reflectionData(); if (rd != null) { res = rd.publicFields; if (res != null) return res; } // No cached value available; compute value recursively. // Traverse in correct order for getField(). List fields = new ArrayList<>(); if (traversedInterfaces == null) { traversedInterfaces = new HashSet<>(); } // Local fields Field[] tmp = privateGetDeclaredFields(true); addAll(fields, tmp); // Direct superinterfaces, recursively for (Class c : getInterfaces()) { if (!traversedInterfaces.contains(c)) { traversedInterfaces.add(c); addAll(fields, c.privateGetPublicFields(traversedInterfaces)); } } // Direct superclass, recursively if (!isInterface()) { Class c = getSuperclass(); if (c != null) { addAll(fields, c.privateGetPublicFields(traversedInterfaces)); } } res = new Field[fields.size()]; fields.toArray(res); if (rd != null) { rd.publicFields = res; } return res; } private static void addAll(Collection c, Field[] o) { for (int i = 0; i < o.length; i++) { c.add(o[i]); } } // // // java.lang.reflect.Constructor handling // // // Returns an array of "root" constructors. These Constructor // objects must NOT be propagated to the outside world, but must // instead be copied via ReflectionFactory.copyConstructor. private Constructor[] privateGetDeclaredConstructors(boolean publicOnly) { checkInitted(); Constructor[] res; ReflectionData rd = reflectionData(); if (rd != null) { res = publicOnly ? rd.publicConstructors : rd.declaredConstructors; if (res != null) return res; } // No cached value available; request value from VM if (isInterface()) { @SuppressWarnings("unchecked") Constructor[] temporaryRes = (Constructor[]) new Constructor[0]; res = temporaryRes; } else { res = getDeclaredConstructors0(publicOnly); } if (rd != null) { if (publicOnly) { rd.publicConstructors = res; } else { rd.declaredConstructors = res; } } return res; } // // // java.lang.reflect.Method handling // // // Returns an array of "root" methods. These Method objects must NOT // be propagated to the outside world, but must instead be copied // via ReflectionFactory.copyMethod. private Method[] privateGetDeclaredMethods(boolean publicOnly) { checkInitted(); Method[] res; ReflectionData rd = reflectionData(); if (rd != null) { res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods; if (res != null) return res; } // No cached value available; request value from VM res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly)); if (rd != null) { if (publicOnly) { rd.declaredPublicMethods = res; } else { rd.declaredMethods = res; } } return res; } static class MethodArray { private Method[] methods; private int length; MethodArray() { methods = new Method[20]; length = 0; } void add(Method m) { if (length == methods.length) { methods = Arrays.copyOf(methods, 2 * methods.length); } methods[length++] = m; } void addAll(Method[] ma) { for (int i = 0; i < ma.length; i++) { add(ma[i]); } } void addAll(MethodArray ma) { for (int i = 0; i < ma.length(); i++) { add(ma.get(i)); } } void addIfNotPresent(Method newMethod) { for (int i = 0; i < length; i++) { Method m = methods[i]; if (m == newMethod || (m != null && m.equals(newMethod))) { return; } } add(newMethod); } void addAllIfNotPresent(MethodArray newMethods) { for (int i = 0; i < newMethods.length(); i++) { Method m = newMethods.get(i); if (m != null) { addIfNotPresent(m); } } } int length() { return length; } Method get(int i) { return methods[i]; } void removeByNameAndSignature(Method toRemove) { for (int i = 0; i < length; i++) { Method m = methods[i]; if (m != null && m.getReturnType() == toRemove.getReturnType() && m.getName() == toRemove.getName() && arrayContentsEq(m.getParameterTypes(), toRemove.getParameterTypes())) { methods[i] = null; } } } void compactAndTrim() { int newPos = 0; // Get rid of null slots for (int pos = 0; pos < length; pos++) { Method m = methods[pos]; if (m != null) { if (pos != newPos) { methods[newPos] = m; } newPos++; } } if (newPos != methods.length) { methods = Arrays.copyOf(methods, newPos); } } Method[] getArray() { return methods; } } // Returns an array of "root" methods. These Method objects must NOT // be propagated to the outside world, but must instead be copied // via ReflectionFactory.copyMethod. private Method[] privateGetPublicMethods() { checkInitted(); Method[] res; ReflectionData rd = reflectionData(); if (rd != null) { res = rd.publicMethods; if (res != null) return res; } // No cached value available; compute value recursively. // Start by fetching public declared methods MethodArray methods = new MethodArray(); { Method[] tmp = privateGetDeclaredMethods(true); methods.addAll(tmp); } // Now recur over superclass and direct superinterfaces. // Go over superinterfaces first so we can more easily filter // out concrete implementations inherited from superclasses at // the end. MethodArray inheritedMethods = new MethodArray(); Class[] interfaces = getInterfaces(); for (int i = 0; i < interfaces.length; i++) { inheritedMethods.addAll(interfaces[i].privateGetPublicMethods()); } if (!isInterface()) { Class c = getSuperclass(); if (c != null) { MethodArray supers = new MethodArray(); supers.addAll(c.privateGetPublicMethods()); // Filter out concrete implementations of any // interface methods for (int i = 0; i < supers.length(); i++) { Method m = supers.get(i); if (m != null && !Modifier.isAbstract(m.getModifiers())) { inheritedMethods.removeByNameAndSignature(m); } } // Insert superclass's inherited methods before // superinterfaces' to satisfy getMethod's search // order supers.addAll(inheritedMethods); inheritedMethods = supers; } } // Filter out all local methods from inherited ones for (int i = 0; i < methods.length(); i++) { Method m = methods.get(i); inheritedMethods.removeByNameAndSignature(m); } methods.addAllIfNotPresent(inheritedMethods); methods.compactAndTrim(); res = methods.getArray(); if (rd != null) { rd.publicMethods = res; } return res; } // // Helpers for fetchers of one field, method, or constructor // private static Field searchFields(Field[] fields, String name) { String internedName = name.intern(); for (int i = 0; i < fields.length; i++) { if (fields[i].getName() == internedName) { return getReflectionFactory().copyField(fields[i]); } } return null; } private Field getField0(String name) throws NoSuchFieldException { // Note: the intent is that the search algorithm this routine // uses be equivalent to the ordering imposed by // privateGetPublicFields(). It fetches only the declared // public fields for each class, however, to reduce the number // of Field objects which have to be created for the common // case where the field being requested is declared in the // class which is being queried. Field res; // Search declared public fields if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) { return res; } // Direct superinterfaces, recursively Class[] interfaces = getInterfaces(); for (int i = 0; i < interfaces.length; i++) { Class c = interfaces[i]; if ((res = c.getField0(name)) != null) { return res; } } // Direct superclass, recursively if (!isInterface()) { Class c = getSuperclass(); if (c != null) { if ((res = c.getField0(name)) != null) { return res; } } } return null; } private static Method searchMethods(Method[] methods, String name, Class[] parameterTypes) { Method res = null; String internedName = name.intern(); for (int i = 0; i < methods.length; i++) { Method m = methods[i]; if (m.getName() == internedName && arrayContentsEq(parameterTypes, m.getParameterTypes()) && (res == null || res.getReturnType().isAssignableFrom(m.getReturnType()))) res = m; } return (res == null ? res : getReflectionFactory().copyMethod(res)); } private Method getMethod0(String name, Class[] parameterTypes) { // Note: the intent is that the search algorithm this routine // uses be equivalent to the ordering imposed by // privateGetPublicMethods(). It fetches only the declared // public methods for each class, however, to reduce the // number of Method objects which have to be created for the // common case where the method being requested is declared in // the class which is being queried. Method res; // Search declared public methods if ((res = searchMethods(privateGetDeclaredMethods(true), name, parameterTypes)) != null) { return res; } // Search superclass's methods if (!isInterface()) { Class c = getSuperclass(); if (c != null) { if ((res = c.getMethod0(name, parameterTypes)) != null) { return res; } } } // Search superinterfaces' methods Class[] interfaces = getInterfaces(); for (int i = 0; i < interfaces.length; i++) { Class c = interfaces[i]; if ((res = c.getMethod0(name, parameterTypes)) != null) { return res; } } // Not found return null; } private Constructor getConstructor0(Class[] parameterTypes, int which) throws NoSuchMethodException { Constructor[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC)); for (Constructor constructor : constructors) { if (arrayContentsEq(parameterTypes, constructor.getParameterTypes())) { return getReflectionFactory().copyConstructor(constructor); } } throw new NoSuchMethodException(getName() + "." + argumentTypesToString(parameterTypes)); } // // Other helpers and base implementation // private static boolean arrayContentsEq(Object[] a1, Object[] a2) { if (a1 == null) { return a2 == null || a2.length == 0; } if (a2 == null) { return a1.length == 0; } if (a1.length != a2.length) { return false; } for (int i = 0; i < a1.length; i++) { if (a1[i] != a2[i]) { return false; } } return true; } private static Field[] copyFields(Field[] arg) { Field[] out = new Field[arg.length]; ReflectionFactory fact = getReflectionFactory(); for (int i = 0; i < arg.length; i++) { out[i] = fact.copyField(arg[i]); } return out; } private static Method[] copyMethods(Method[] arg) { Method[] out = new Method[arg.length]; ReflectionFactory fact = getReflectionFactory(); for (int i = 0; i < arg.length; i++) { out[i] = fact.copyMethod(arg[i]); } return out; } private static Constructor[] copyConstructors(Constructor[] arg) { Constructor[] out = arg.clone(); ReflectionFactory fact = getReflectionFactory(); for (int i = 0; i < out.length; i++) { out[i] = fact.copyConstructor(out[i]); } return out; } private native Field[] getDeclaredFields0(boolean publicOnly); private native Method[] getDeclaredMethods0(boolean publicOnly); private native Constructor[] getDeclaredConstructors0(boolean publicOnly); private native Class[] getDeclaredClasses0(); private static String argumentTypesToString(Class[] argTypes) { StringBuilder buf = new StringBuilder(); buf.append("("); if (argTypes != null) { for (int i = 0; i < argTypes.length; i++) { if (i > 0) { buf.append(", "); } Class c = argTypes[i]; buf.append((c == null) ? "null" : c.getName()); } } buf.append(")"); return buf.toString(); } /** use serialVersionUID from JDK 1.1 for interoperability */ private static final long serialVersionUID = 3206093459760846163L; /** * Class Class is special cased within the Serialization Stream Protocol. * * A Class instance is written initially into an ObjectOutputStream in the * following format: *

     *      {@code TC_CLASS} ClassDescriptor
     *      A ClassDescriptor is a special cased serialization of
     *      a {@code java.io.ObjectStreamClass} instance.
     * 
* A new handle is generated for the initial time the class descriptor * is written into the stream. Future references to the class descriptor * are written as references to the initial class descriptor instance. * * @see java.io.ObjectStreamClass */ private static final ObjectStreamField[] serialPersistentFields = new ObjectStreamField[0]; /** * Returns the assertion status that would be assigned to this * class if it were to be initialized at the time this method is invoked. * If this class has had its assertion status set, the most recent * setting will be returned; otherwise, if any package default assertion * status pertains to this class, the most recent setting for the most * specific pertinent package default assertion status is returned; * otherwise, if this class is not a system class (i.e., it has a * class loader) its class loader's default assertion status is returned; * otherwise, the system class default assertion status is returned. *

* Few programmers will have any need for this method; it is provided * for the benefit of the JRE itself. (It allows a class to determine at * the time that it is initialized whether assertions should be enabled.) * Note that this method is not guaranteed to return the actual * assertion status that was (or will be) associated with the specified * class when it was (or will be) initialized. * * @return the desired assertion status of the specified class. * @see java.lang.ClassLoader#setClassAssertionStatus * @see java.lang.ClassLoader#setPackageAssertionStatus * @see java.lang.ClassLoader#setDefaultAssertionStatus * @since 1.4 */ public boolean desiredAssertionStatus() { ClassLoader loader = getClassLoader(); // If the loader is null this is a system class, so ask the VM if (loader == null) return desiredAssertionStatus0(this); // If the classloader has been initialized with the assertion // directives, ask it. Otherwise, ask the VM. synchronized(loader.assertionLock) { if (loader.classAssertionStatus != null) { return loader.desiredAssertionStatus(getName()); } } return desiredAssertionStatus0(this); } // Retrieves the desired assertion status of this class from the VM private static native boolean desiredAssertionStatus0(Class clazz); /** * Returns true if and only if this class was declared as an enum in the * source code. * * @return true if and only if this class was declared as an enum in the * source code * @since 1.5 */ public boolean isEnum() { // An enum must both directly extend java.lang.Enum and have // the ENUM bit set; classes for specialized enum constants // don't do the former. return (this.getModifiers() & ENUM) != 0 && this.getSuperclass() == java.lang.Enum.class; } // Fetches the factory for reflective objects private static ReflectionFactory getReflectionFactory() { if (reflectionFactory == null) { reflectionFactory = java.security.AccessController.doPrivileged (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction()); } return reflectionFactory; } private static ReflectionFactory reflectionFactory; // To be able to query system properties as soon as they're available private static boolean initted = false; private static void checkInitted() { if (initted) return; AccessController.doPrivileged(new PrivilegedAction() { public Void run() { // Tests to ensure the system properties table is fully // initialized. This is needed because reflection code is // called very early in the initialization process (before // command-line arguments have been parsed and therefore // these user-settable properties installed.) We assume that // if System.out is non-null then the System class has been // fully initialized and that the bulk of the startup code // has been run. if (System.out == null) { // java.lang.System not yet fully initialized return null; } // Doesn't use Boolean.getBoolean to avoid class init. String val = System.getProperty("sun.reflect.noCaches"); if (val != null && val.equals("true")) { useCaches = false; } initted = true; return null; } }); } /** * Returns the elements of this enum class or null if this * Class object does not represent an enum type. * * @return an array containing the values comprising the enum class * represented by this Class object in the order they're * declared, or null if this Class object does not * represent an enum type * @since 1.5 */ public T[] getEnumConstants() { T[] values = getEnumConstantsShared(); return (values != null) ? values.clone() : null; } /** * Returns the elements of this enum class or null if this * Class object does not represent an enum type; * identical to getEnumConstants except that the result is * uncloned, cached, and shared by all callers. */ T[] getEnumConstantsShared() { if (enumConstants == null) { if (!isEnum()) return null; try { final Method values = getMethod("values"); java.security.AccessController.doPrivileged( new java.security.PrivilegedAction() { public Void run() { values.setAccessible(true); return null; } }); @SuppressWarnings("unchecked") T[] temporaryConstants = (T[])values.invoke(null); enumConstants = temporaryConstants; } // These can happen when users concoct enum-like classes // that don't comply with the enum spec. catch (InvocationTargetException | NoSuchMethodException | IllegalAccessException ex) { return null; } } return enumConstants; } private volatile transient T[] enumConstants = null; /** * Returns a map from simple name to enum constant. This package-private * method is used internally by Enum to implement * {@code public static > T valueOf(Class, String)} * efficiently. Note that the map is returned by this method is * created lazily on first use. Typically it won't ever get created. */ Map enumConstantDirectory() { if (enumConstantDirectory == null) { T[] universe = getEnumConstantsShared(); if (universe == null) throw new IllegalArgumentException( getName() + " is not an enum type"); Map m = new HashMap<>(2 * universe.length); for (T constant : universe) m.put(((Enum)constant).name(), constant); enumConstantDirectory = m; } return enumConstantDirectory; } private volatile transient Map enumConstantDirectory = null; /** * Casts an object to the class or interface represented * by this {@code Class} object. * * @param obj the object to be cast * @return the object after casting, or null if obj is null * * @throws ClassCastException if the object is not * null and is not assignable to the type T. * * @since 1.5 */ @SuppressWarnings("unchecked") public T cast(Object obj) { if (obj != null && !isInstance(obj)) throw new ClassCastException(cannotCastMsg(obj)); return (T) obj; } private String cannotCastMsg(Object obj) { return "Cannot cast " + obj.getClass().getName() + " to " + getName(); } /** * Casts this {@code Class} object to represent a subclass of the class * represented by the specified class object. Checks that the cast * is valid, and throws a {@code ClassCastException} if it is not. If * this method succeeds, it always returns a reference to this class object. * *

This method is useful when a client needs to "narrow" the type of * a {@code Class} object to pass it to an API that restricts the * {@code Class} objects that it is willing to accept. A cast would * generate a compile-time warning, as the correctness of the cast * could not be checked at runtime (because generic types are implemented * by erasure). * * @return this {@code Class} object, cast to represent a subclass of * the specified class object. * @throws ClassCastException if this {@code Class} object does not * represent a subclass of the specified class (here "subclass" includes * the class itself). * @since 1.5 */ @SuppressWarnings("unchecked") public Class asSubclass(Class clazz) { if (clazz.isAssignableFrom(this)) return (Class) this; else throw new ClassCastException(this.toString()); } /** * @throws NullPointerException {@inheritDoc} * @since 1.5 */ @SuppressWarnings("unchecked") public A getAnnotation(Class annotationClass) { Objects.requireNonNull(annotationClass); initAnnotationsIfNecessary(); return (A) annotations.get(annotationClass); } /** * {@inheritDoc} * @throws NullPointerException {@inheritDoc} * @since 1.5 */ @Override public boolean isAnnotationPresent(Class annotationClass) { return AnnotatedElement.super.isAnnotationPresent(annotationClass); } /** * @throws NullPointerException {@inheritDoc} * @since 1.8 */ @Override public A[] getAnnotationsByType(Class annotationClass) { Objects.requireNonNull(annotationClass); initAnnotationsIfNecessary(); return AnnotationSupport.getMultipleAnnotations(annotations, annotationClass); } /** * @since 1.5 */ public Annotation[] getAnnotations() { initAnnotationsIfNecessary(); return AnnotationParser.toArray(annotations); } /** * @throws NullPointerException {@inheritDoc} * @since 1.8 */ @Override @SuppressWarnings("unchecked") public A getDeclaredAnnotation(Class annotationClass) { Objects.requireNonNull(annotationClass); initAnnotationsIfNecessary(); return (A) declaredAnnotations.get(annotationClass); } /** * @throws NullPointerException {@inheritDoc} * @since 1.8 */ @Override public A[] getDeclaredAnnotationsByType(Class annotationClass) { Objects.requireNonNull(annotationClass); initAnnotationsIfNecessary(); return AnnotationSupport.getMultipleAnnotations(declaredAnnotations, annotationClass); } /** * @since 1.5 */ public Annotation[] getDeclaredAnnotations() { initAnnotationsIfNecessary(); return AnnotationParser.toArray(declaredAnnotations); } // Annotations cache private transient Map, Annotation> annotations; private transient Map, Annotation> declaredAnnotations; // Value of classRedefinedCount when we last cleared the cached annotations and declaredAnnotations fields private transient int lastAnnotationsRedefinedCount = 0; // Clears cached values that might possibly have been obsoleted by // a class redefinition. private void clearAnnotationCachesOnClassRedefinition() { if (lastAnnotationsRedefinedCount != classRedefinedCount) { annotations = declaredAnnotations = null; lastAnnotationsRedefinedCount = classRedefinedCount; } } private synchronized void initAnnotationsIfNecessary() { clearAnnotationCachesOnClassRedefinition(); if (annotations != null) return; declaredAnnotations = AnnotationParser.parseAnnotations( getRawAnnotations(), getConstantPool(), this); Class superClass = getSuperclass(); if (superClass == null) { annotations = declaredAnnotations; } else { annotations = new HashMap<>(); superClass.initAnnotationsIfNecessary(); for (Map.Entry, Annotation> e : superClass.annotations.entrySet()) { Class annotationClass = e.getKey(); if (AnnotationType.getInstance(annotationClass).isInherited()) annotations.put(annotationClass, e.getValue()); } annotations.putAll(declaredAnnotations); } } // Annotation types cache their internal (AnnotationType) form private AnnotationType annotationType; void setAnnotationType(AnnotationType type) { annotationType = type; } AnnotationType getAnnotationType() { return annotationType; } /* Backing store of user-defined values pertaining to this class. * Maintained by the ClassValue class. */ transient ClassValue.ClassValueMap classValueMap; /** * Returns an AnnotatedType object that represents the use of a type to specify * the superclass of the entity represented by this Class. (The use of type * Foo to specify the superclass in '... extends Foo' is distinct from the * declaration of type Foo.) * * If this Class represents a class type whose declaration does not explicitly * indicate an annotated superclass, the return value is null. * * If this Class represents either the Object class, an interface type, an * array type, a primitive type, or void, the return value is null. * * @since 1.8 */ public AnnotatedType getAnnotatedSuperclass() { return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this); } /** * Returns an array of AnnotatedType objects that represent the use of types to * specify superinterfaces of the entity represented by this Class. (The use * of type Foo to specify a superinterface in '... implements Foo' is * distinct from the declaration of type Foo.) * * If this Class represents a class, the return value is an array * containing objects representing the uses of interface types to specify * interfaces implemented by the class. The order of the objects in the * array corresponds to the order of the interface types used in the * 'implements' clause of the declaration of this Class. * * If this Class represents an interface, the return value is an array * containing objects representing the uses of interface types to specify * interfaces directly extended by the interface. The order of the objects in * the array corresponds to the order of the interface types used in the * 'extends' clause of the declaration of this Class. * * If this Class represents a class or interface whose declaration does not * explicitly indicate any annotated superinterfaces, the return value is an * array of length 0. * * If this Class represents either the Object class, an array type, a * primitive type, or void, the return value is an array of length 0. * * @since 1.8 */ public AnnotatedType[] getAnnotatedInterfaces() { return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this); } }