| /* |
| * Copyright (c) 2005, 2009, 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 sun.reflect.misc; |
| |
| import java.security.AllPermission; |
| import java.security.AccessController; |
| import java.security.PermissionCollection; |
| import java.security.SecureClassLoader; |
| import java.security.PrivilegedExceptionAction; |
| import java.security.CodeSource; |
| import java.io.InputStream; |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.net.HttpURLConnection; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.AccessibleObject; |
| import java.lang.reflect.Modifier; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| import sun.misc.IOUtils; |
| import sun.net.www.ParseUtil; |
| import sun.security.util.SecurityConstants; |
| |
| |
| class Trampoline { |
| static { |
| if (Trampoline.class.getClassLoader() == null) { |
| throw new Error( |
| "Trampoline must not be defined by the bootstrap classloader"); |
| } |
| } |
| |
| private static void ensureInvocableMethod(Method m) |
| throws InvocationTargetException |
| { |
| Class<?> clazz = m.getDeclaringClass(); |
| if (clazz.equals(AccessController.class) || |
| clazz.equals(Method.class) || |
| clazz.getName().startsWith("java.lang.invoke.")) |
| throw new InvocationTargetException( |
| new UnsupportedOperationException("invocation not supported")); |
| } |
| |
| private static Object invoke(Method m, Object obj, Object[] params) |
| throws InvocationTargetException, IllegalAccessException |
| { |
| ensureInvocableMethod(m); |
| return m.invoke(obj, params); |
| } |
| } |
| |
| /* |
| * Create a trampoline class. |
| */ |
| public final class MethodUtil extends SecureClassLoader { |
| private static String MISC_PKG = "sun.reflect.misc."; |
| private static String TRAMPOLINE = MISC_PKG + "Trampoline"; |
| private static Method bounce = getTrampoline(); |
| |
| private MethodUtil() { |
| super(); |
| } |
| |
| public static Method getMethod(Class<?> cls, String name, Class[] args) |
| throws NoSuchMethodException { |
| ReflectUtil.checkPackageAccess(cls); |
| return cls.getMethod(name, args); |
| } |
| |
| public static Method[] getMethods(Class cls) { |
| ReflectUtil.checkPackageAccess(cls); |
| return cls.getMethods(); |
| } |
| |
| /* |
| * Discover the public methods on public classes |
| * and interfaces accessible to any caller by calling |
| * Class.getMethods() and walking towards Object until |
| * we're done. |
| */ |
| public static Method[] getPublicMethods(Class cls) { |
| // compatibility for update release |
| if (System.getSecurityManager() == null) { |
| return cls.getMethods(); |
| } |
| Map<Signature, Method> sigs = new HashMap<Signature, Method>(); |
| while (cls != null) { |
| boolean done = getInternalPublicMethods(cls, sigs); |
| if (done) { |
| break; |
| } |
| getInterfaceMethods(cls, sigs); |
| cls = cls.getSuperclass(); |
| } |
| return sigs.values().toArray(new Method[sigs.size()]); |
| } |
| |
| /* |
| * Process the immediate interfaces of this class or interface. |
| */ |
| private static void getInterfaceMethods(Class cls, |
| Map<Signature, Method> sigs) { |
| Class[] intfs = cls.getInterfaces(); |
| for (int i=0; i < intfs.length; i++) { |
| Class intf = intfs[i]; |
| boolean done = getInternalPublicMethods(intf, sigs); |
| if (!done) { |
| getInterfaceMethods(intf, sigs); |
| } |
| } |
| } |
| |
| /* |
| * |
| * Process the methods in this class or interface |
| */ |
| private static boolean getInternalPublicMethods(Class cls, |
| Map<Signature, Method> sigs) { |
| Method[] methods = null; |
| try { |
| /* |
| * This class or interface is non-public so we |
| * can't use any of it's methods. Go back and |
| * try again with a superclass or superinterface. |
| */ |
| if (!Modifier.isPublic(cls.getModifiers())) { |
| return false; |
| } |
| if (!ReflectUtil.isPackageAccessible(cls)) { |
| return false; |
| } |
| |
| methods = cls.getMethods(); |
| } catch (SecurityException se) { |
| return false; |
| } |
| |
| /* |
| * Check for inherited methods with non-public |
| * declaring classes. They might override and hide |
| * methods from their superclasses or |
| * superinterfaces. |
| */ |
| boolean done = true; |
| for (int i=0; i < methods.length; i++) { |
| Class dc = methods[i].getDeclaringClass(); |
| if (!Modifier.isPublic(dc.getModifiers())) { |
| done = false; |
| break; |
| } |
| } |
| |
| if (done) { |
| /* |
| * We're done. Spray all the methods into |
| * the list and then we're out of here. |
| */ |
| for (int i=0; i < methods.length; i++) { |
| addMethod(sigs, methods[i]); |
| } |
| } else { |
| /* |
| * Simulate cls.getDeclaredMethods() by |
| * stripping away inherited methods. |
| */ |
| for (int i=0; i < methods.length; i++) { |
| Class dc = methods[i].getDeclaringClass(); |
| if (cls.equals(dc)) { |
| addMethod(sigs, methods[i]); |
| } |
| } |
| } |
| return done; |
| } |
| |
| private static void addMethod(Map<Signature, Method> sigs, Method method) { |
| Signature signature = new Signature(method); |
| if (!sigs.containsKey(signature)) { |
| sigs.put(signature, method); |
| } else if (!method.getDeclaringClass().isInterface()){ |
| /* |
| * Superclasses beat interfaces. |
| */ |
| Method old = sigs.get(signature); |
| if (old.getDeclaringClass().isInterface()) { |
| sigs.put(signature, method); |
| } |
| } |
| } |
| |
| /** |
| * A class that represents the unique elements of a method that will be a |
| * key in the method cache. |
| */ |
| private static class Signature { |
| private String methodName; |
| private Class[] argClasses; |
| |
| private volatile int hashCode = 0; |
| |
| Signature(Method m) { |
| this.methodName = m.getName(); |
| this.argClasses = m.getParameterTypes(); |
| } |
| |
| public boolean equals(Object o2) { |
| if (this == o2) { |
| return true; |
| } |
| Signature that = (Signature)o2; |
| if (!(methodName.equals(that.methodName))) { |
| return false; |
| } |
| if (argClasses.length != that.argClasses.length) { |
| return false; |
| } |
| for (int i = 0; i < argClasses.length; i++) { |
| if (!(argClasses[i] == that.argClasses[i])) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Hash code computed using algorithm suggested in |
| * Effective Java, Item 8. |
| */ |
| public int hashCode() { |
| if (hashCode == 0) { |
| int result = 17; |
| result = 37 * result + methodName.hashCode(); |
| if (argClasses != null) { |
| for (int i = 0; i < argClasses.length; i++) { |
| result = 37 * result + ((argClasses[i] == null) ? 0 : |
| argClasses[i].hashCode()); |
| } |
| } |
| hashCode = result; |
| } |
| return hashCode; |
| } |
| } |
| |
| |
| /* |
| * Bounce through the trampoline. |
| */ |
| public static Object invoke(Method m, Object obj, Object[] params) |
| throws InvocationTargetException, IllegalAccessException { |
| try { |
| return bounce.invoke(null, new Object[] {m, obj, params}); |
| } catch (InvocationTargetException ie) { |
| Throwable t = ie.getCause(); |
| |
| if (t instanceof InvocationTargetException) { |
| throw (InvocationTargetException)t; |
| } else if (t instanceof IllegalAccessException) { |
| throw (IllegalAccessException)t; |
| } else if (t instanceof RuntimeException) { |
| throw (RuntimeException)t; |
| } else if (t instanceof Error) { |
| throw (Error)t; |
| } else { |
| throw new Error("Unexpected invocation error", t); |
| } |
| } catch (IllegalAccessException iae) { |
| // this can't happen |
| throw new Error("Unexpected invocation error", iae); |
| } |
| } |
| |
| private static Method getTrampoline() { |
| try { |
| return AccessController.doPrivileged( |
| new PrivilegedExceptionAction<Method>() { |
| public Method run() throws Exception { |
| Class<?> t = getTrampolineClass(); |
| Class[] types = { |
| Method.class, Object.class, Object[].class |
| }; |
| Method b = t.getDeclaredMethod("invoke", types); |
| b.setAccessible(true); |
| return b; |
| } |
| }); |
| } catch (Exception e) { |
| throw new InternalError("bouncer cannot be found"); |
| } |
| } |
| |
| |
| protected synchronized Class loadClass(String name, boolean resolve) |
| throws ClassNotFoundException |
| { |
| // First, check if the class has already been loaded |
| ReflectUtil.checkPackageAccess(name); |
| Class c = findLoadedClass(name); |
| if (c == null) { |
| try { |
| c = findClass(name); |
| } catch (ClassNotFoundException e) { |
| // Fall through ... |
| } |
| if (c == null) { |
| c = getParent().loadClass(name); |
| } |
| } |
| if (resolve) { |
| resolveClass(c); |
| } |
| return c; |
| } |
| |
| |
| protected Class findClass(final String name) |
| throws ClassNotFoundException |
| { |
| if (!name.startsWith(MISC_PKG)) { |
| throw new ClassNotFoundException(name); |
| } |
| String path = name.replace('.', '/').concat(".class"); |
| URL res = getResource(path); |
| if (res != null) { |
| try { |
| return defineClass(name, res); |
| } catch (IOException e) { |
| throw new ClassNotFoundException(name, e); |
| } |
| } else { |
| throw new ClassNotFoundException(name); |
| } |
| } |
| |
| |
| /* |
| * Define the proxy classes |
| */ |
| private Class defineClass(String name, URL url) throws IOException { |
| byte[] b = getBytes(url); |
| CodeSource cs = new CodeSource(null, (java.security.cert.Certificate[])null); |
| if (!name.equals(TRAMPOLINE)) { |
| throw new IOException("MethodUtil: bad name " + name); |
| } |
| return defineClass(name, b, 0, b.length, cs); |
| } |
| |
| |
| /* |
| * Returns the contents of the specified URL as an array of bytes. |
| */ |
| private static byte[] getBytes(URL url) throws IOException { |
| URLConnection uc = url.openConnection(); |
| if (uc instanceof java.net.HttpURLConnection) { |
| java.net.HttpURLConnection huc = (java.net.HttpURLConnection) uc; |
| int code = huc.getResponseCode(); |
| if (code >= java.net.HttpURLConnection.HTTP_BAD_REQUEST) { |
| throw new IOException("open HTTP connection failed."); |
| } |
| } |
| int len = uc.getContentLength(); |
| InputStream in = new BufferedInputStream(uc.getInputStream()); |
| |
| byte[] b; |
| try { |
| b = IOUtils.readFully(in, len, true); |
| } finally { |
| in.close(); |
| } |
| return b; |
| } |
| |
| |
| protected PermissionCollection getPermissions(CodeSource codesource) |
| { |
| PermissionCollection perms = super.getPermissions(codesource); |
| perms.add(new AllPermission()); |
| return perms; |
| } |
| |
| private static Class getTrampolineClass() { |
| try { |
| return Class.forName(TRAMPOLINE, true, new MethodUtil()); |
| } catch (ClassNotFoundException e) { |
| } |
| return null; |
| } |
| |
| } |