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/*
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* Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.reflect.misc;
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import java.security.AllPermission;
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import java.security.AccessController;
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import java.security.PermissionCollection;
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import java.security.SecureClassLoader;
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import java.security.PrivilegedExceptionAction;
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import java.security.CodeSource;
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import java.io.InputStream;
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import java.io.BufferedInputStream;
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import java.io.IOException;
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import java.net.URL;
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import java.net.URLConnection;
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import java.net.HttpURLConnection;
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import java.lang.reflect.Method;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.Modifier;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Map;
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import sun.net.www.ParseUtil;
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import sun.security.util.SecurityConstants;
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class Trampoline {
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private static Object invoke(Method m, Object obj, Object[] params)
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throws InvocationTargetException, IllegalAccessException {
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return m.invoke(obj, params);
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}
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}
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/*
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* Create a trampoline class.
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*/
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public final class MethodUtil extends SecureClassLoader {
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private static String MISC_PKG = "sun.reflect.misc.";
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private static String TRAMPOLINE = MISC_PKG + "Trampoline";
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private static Method bounce = getTrampoline();
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private MethodUtil() {
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super();
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}
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public static Method getMethod(Class<?> cls, String name, Class[] args)
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throws NoSuchMethodException {
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ReflectUtil.checkPackageAccess(cls);
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return cls.getMethod(name, args);
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}
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public static Method[] getMethods(Class cls) {
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ReflectUtil.checkPackageAccess(cls);
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return cls.getMethods();
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}
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/*
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* Discover the public methods on public classes
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* and interfaces accessible to any caller by calling
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* Class.getMethods() and walking towards Object until
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* we're done.
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*/
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public static Method[] getPublicMethods(Class cls) {
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// compatibility for update release
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if (System.getSecurityManager() == null) {
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return cls.getMethods();
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}
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Map<Signature, Method> sigs = new HashMap<Signature, Method>();
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while (cls != null) {
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boolean done = getInternalPublicMethods(cls, sigs);
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if (done) {
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break;
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}
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getInterfaceMethods(cls, sigs);
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cls = cls.getSuperclass();
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}
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return sigs.values().toArray(new Method[sigs.size()]);
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}
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/*
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* Process the immediate interfaces of this class or interface.
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*/
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private static void getInterfaceMethods(Class cls,
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Map<Signature, Method> sigs) {
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Class[] intfs = cls.getInterfaces();
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for (int i=0; i < intfs.length; i++) {
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Class intf = intfs[i];
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boolean done = getInternalPublicMethods(intf, sigs);
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if (!done) {
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getInterfaceMethods(intf, sigs);
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}
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}
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}
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/*
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*
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* Process the methods in this class or interface
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*/
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private static boolean getInternalPublicMethods(Class cls,
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Map<Signature, Method> sigs) {
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Method[] methods = null;
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try {
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/*
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* This class or interface is non-public so we
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* can't use any of it's methods. Go back and
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* try again with a superclass or superinterface.
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*/
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if (!Modifier.isPublic(cls.getModifiers())) {
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return false;
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}
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if (!ReflectUtil.isPackageAccessible(cls)) {
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return false;
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}
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methods = cls.getMethods();
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} catch (SecurityException se) {
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return false;
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}
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/*
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* Check for inherited methods with non-public
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* declaring classes. They might override and hide
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* methods from their superclasses or
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* superinterfaces.
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*/
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boolean done = true;
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for (int i=0; i < methods.length; i++) {
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Class dc = methods[i].getDeclaringClass();
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if (!Modifier.isPublic(dc.getModifiers())) {
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done = false;
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break;
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}
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}
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if (done) {
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/*
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* We're done. Spray all the methods into
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* the list and then we're out of here.
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*/
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for (int i=0; i < methods.length; i++) {
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addMethod(sigs, methods[i]);
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}
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} else {
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/*
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* Simulate cls.getDeclaredMethods() by
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* stripping away inherited methods.
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*/
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for (int i=0; i < methods.length; i++) {
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Class dc = methods[i].getDeclaringClass();
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if (cls.equals(dc)) {
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addMethod(sigs, methods[i]);
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}
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}
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}
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return done;
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}
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private static void addMethod(Map<Signature, Method> sigs, Method method) {
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Signature signature = new Signature(method);
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if (!sigs.containsKey(signature)) {
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sigs.put(signature, method);
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} else if (!method.getDeclaringClass().isInterface()){
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/*
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* Superclasses beat interfaces.
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*/
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Method old = sigs.get(signature);
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if (old.getDeclaringClass().isInterface()) {
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sigs.put(signature, method);
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}
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}
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}
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/**
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* A class that represents the unique elements of a method that will be a
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* key in the method cache.
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*/
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private static class Signature {
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private String methodName;
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private Class[] argClasses;
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private volatile int hashCode = 0;
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Signature(Method m) {
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this.methodName = m.getName();
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this.argClasses = m.getParameterTypes();
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}
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public boolean equals(Object o2) {
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if (this == o2) {
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return true;
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}
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Signature that = (Signature)o2;
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if (!(methodName.equals(that.methodName))) {
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return false;
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}
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if (argClasses.length != that.argClasses.length) {
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return false;
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}
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for (int i = 0; i < argClasses.length; i++) {
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if (!(argClasses[i] == that.argClasses[i])) {
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return false;
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}
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}
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return true;
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}
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/**
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* Hash code computed using algorithm suggested in
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* Effective Java, Item 8.
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*/
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public int hashCode() {
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if (hashCode == 0) {
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int result = 17;
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result = 37 * result + methodName.hashCode();
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if (argClasses != null) {
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for (int i = 0; i < argClasses.length; i++) {
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result = 37 * result + ((argClasses[i] == null) ? 0 :
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argClasses[i].hashCode());
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}
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}
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hashCode = result;
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}
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return hashCode;
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}
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}
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/*
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* Bounce through the trampoline.
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*/
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public static Object invoke(Method m, Object obj, Object[] params)
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throws InvocationTargetException, IllegalAccessException {
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if (m.getDeclaringClass().equals(AccessController.class) ||
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m.getDeclaringClass().equals(Method.class))
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throw new InvocationTargetException(
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new UnsupportedOperationException("invocation not supported"));
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try {
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return bounce.invoke(null, new Object[] {m, obj, params});
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} catch (InvocationTargetException ie) {
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Throwable t = ie.getCause();
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if (t instanceof InvocationTargetException) {
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throw (InvocationTargetException)t;
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} else if (t instanceof IllegalAccessException) {
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throw (IllegalAccessException)t;
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} else if (t instanceof RuntimeException) {
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throw (RuntimeException)t;
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} else if (t instanceof Error) {
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throw (Error)t;
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} else {
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throw new Error("Unexpected invocation error", t);
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}
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} catch (IllegalAccessException iae) {
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// this can't happen
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throw new Error("Unexpected invocation error", iae);
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}
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}
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private static Method getTrampoline() {
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try {
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return AccessController.doPrivileged(
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new PrivilegedExceptionAction<Method>() {
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public Method run() throws Exception {
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Class<?> t = getTrampolineClass();
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Class[] types = {
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Method.class, Object.class, Object[].class
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};
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Method b = t.getDeclaredMethod("invoke", types);
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((AccessibleObject)b).setAccessible(true);
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return b;
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}
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});
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} catch (Exception e) {
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throw new InternalError("bouncer cannot be found");
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}
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}
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protected synchronized Class loadClass(String name, boolean resolve)
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throws ClassNotFoundException
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{
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// First, check if the class has already been loaded
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ReflectUtil.checkPackageAccess(name);
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Class c = findLoadedClass(name);
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if (c == null) {
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try {
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c = findClass(name);
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} catch (ClassNotFoundException e) {
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// Fall through ...
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}
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if (c == null) {
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c = getParent().loadClass(name);
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}
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}
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if (resolve) {
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resolveClass(c);
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}
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return c;
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}
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protected Class findClass(final String name)
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throws ClassNotFoundException
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{
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if (!name.startsWith(MISC_PKG)) {
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throw new ClassNotFoundException(name);
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}
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String path = name.replace('.', '/').concat(".class");
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URL res = getResource(path);
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if (res != null) {
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try {
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return defineClass(name, res);
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} catch (IOException e) {
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throw new ClassNotFoundException(name, e);
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}
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} else {
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throw new ClassNotFoundException(name);
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}
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}
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/*
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* Define the proxy classes
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*/
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private Class defineClass(String name, URL url) throws IOException {
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byte[] b = getBytes(url);
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CodeSource cs = new CodeSource(null, (java.security.cert.Certificate[])null);
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if (!name.equals(TRAMPOLINE)) {
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throw new IOException("MethodUtil: bad name " + name);
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}
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return defineClass(name, b, 0, b.length, cs);
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}
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359 |
/*
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360 |
* Returns the contents of the specified URL as an array of bytes.
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*/
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private static byte[] getBytes(URL url) throws IOException {
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URLConnection uc = url.openConnection();
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364 |
if (uc instanceof java.net.HttpURLConnection) {
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java.net.HttpURLConnection huc = (java.net.HttpURLConnection) uc;
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int code = huc.getResponseCode();
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367 |
if (code >= java.net.HttpURLConnection.HTTP_BAD_REQUEST) {
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368 |
throw new IOException("open HTTP connection failed.");
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369 |
}
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370 |
}
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371 |
int len = uc.getContentLength();
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InputStream in = new BufferedInputStream(uc.getInputStream());
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373 |
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byte[] b;
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375 |
try {
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376 |
if (len != -1) {
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377 |
// Read exactly len bytes from the input stream
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378 |
b = new byte[len];
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379 |
while (len > 0) {
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380 |
int n = in.read(b, b.length - len, len);
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381 |
if (n == -1) {
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382 |
throw new IOException("unexpected EOF");
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383 |
}
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384 |
len -= n;
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385 |
}
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386 |
} else {
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387 |
b = new byte[8192];
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388 |
int total = 0;
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389 |
while ((len = in.read(b, total, b.length - total)) != -1) {
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390 |
total += len;
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391 |
if (total >= b.length) {
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|
392 |
byte[] tmp = new byte[total * 2];
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393 |
System.arraycopy(b, 0, tmp, 0, total);
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394 |
b = tmp;
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|
395 |
}
|
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396 |
}
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|
397 |
// Trim array to correct size, if necessary
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|
398 |
if (total != b.length) {
|
|
399 |
byte[] tmp = new byte[total];
|
|
400 |
System.arraycopy(b, 0, tmp, 0, total);
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|
401 |
b = tmp;
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|
402 |
}
|
|
403 |
}
|
|
404 |
} finally {
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|
405 |
in.close();
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|
406 |
}
|
|
407 |
return b;
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|
408 |
}
|
|
409 |
|
|
410 |
|
|
411 |
protected PermissionCollection getPermissions(CodeSource codesource)
|
|
412 |
{
|
|
413 |
PermissionCollection perms = super.getPermissions(codesource);
|
|
414 |
perms.add(new AllPermission());
|
|
415 |
return perms;
|
|
416 |
}
|
|
417 |
|
|
418 |
private static Class getTrampolineClass() {
|
|
419 |
try {
|
|
420 |
return Class.forName(TRAMPOLINE, true, new MethodUtil());
|
|
421 |
} catch (ClassNotFoundException e) {
|
|
422 |
}
|
|
423 |
return null;
|
|
424 |
}
|
|
425 |
|
|
426 |
}
|