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/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist.util.proxy;

import java.lang.reflect.Method;
import java.io.Serializable;

/**
 * Runtime support routines that the classes generated by ProxyFactory use.
 *
 * @see ProxyFactory
 */
public class RuntimeSupport {
    /**
     * A method handler that only executes a method.
     */
    public static MethodHandler default_interceptor = new DefaultMethodHandler();

    static class DefaultMethodHandler implements MethodHandler, Serializable {
        public Object invoke(Object self, Method m,
                             Method proceed, Object[] args)
            throws Exception
        {
            return proceed.invoke(self, args);
        }
    };

    /**
     * Finds two methods specified by the parameters and stores them
     * into the given array.
     *
     * @throws RuntimeException     if the methods are not found.
     * @see javassist.util.proxy.ProxyFactory
     */
    public static void find2Methods(Class clazz, String superMethod,
                                    String thisMethod, int index,
                                    String desc, java.lang.reflect.Method[] methods)
    {
        methods[index + 1] = thisMethod == null ? null
                                                : findMethod(clazz, thisMethod, desc);
        methods[index] = findSuperClassMethod(clazz, superMethod, desc);
    }

    /**
     * Finds two methods specified by the parameters and stores them
     * into the given array.
     *
     * 

Added back for JBoss Seam. See JASSIST-206.

* * @throws RuntimeException if the methods are not found. * @see javassist.util.proxy.ProxyFactory * @deprecated replaced by {@link #find2Methods(Class, String, String, int, String, Method[])} */ public static void find2Methods(Object self, String superMethod, String thisMethod, int index, String desc, java.lang.reflect.Method[] methods) { methods[index + 1] = thisMethod == null ? null : findMethod(self, thisMethod, desc); methods[index] = findSuperMethod(self, superMethod, desc); } /** * Finds a method with the given name and descriptor. * It searches only the class of self. * *

Added back for JBoss Seam. See JASSIST-206.

* * @throws RuntimeException if the method is not found. * @deprecated replaced by {@link #findMethod(Class, String, String)} */ public static Method findMethod(Object self, String name, String desc) { Method m = findMethod2(self.getClass(), name, desc); if (m == null) error(self.getClass(), name, desc); return m; } /** * Finds a method with the given name and descriptor. * It searches only the class of self. * * @throws RuntimeException if the method is not found. */ public static Method findMethod(Class clazz, String name, String desc) { Method m = findMethod2(clazz, name, desc); if (m == null) error(clazz, name, desc); return m; } /** * Finds a method that has the given name and descriptor and is declared * in the super class. * * @throws RuntimeException if the method is not found. */ public static Method findSuperMethod(Object self, String name, String desc) { // for JBoss Seam. See JASSIST-183. Class clazz = self.getClass(); return findSuperClassMethod(clazz, name, desc); } /** * Finds a method that has the given name and descriptor and is declared * in the super class. * * @throws RuntimeException if the method is not found. */ public static Method findSuperClassMethod(Class clazz, String name, String desc) { Method m = findSuperMethod2(clazz.getSuperclass(), name, desc); if (m == null) m = searchInterfaces(clazz, name, desc); if (m == null) error(clazz, name, desc); return m; } private static void error(Class clazz, String name, String desc) { throw new RuntimeException("not found " + name + ":" + desc + " in " + clazz.getName()); } private static Method findSuperMethod2(Class clazz, String name, String desc) { Method m = findMethod2(clazz, name, desc); if (m != null) return m; Class superClass = clazz.getSuperclass(); if (superClass != null) { m = findSuperMethod2(superClass, name, desc); if (m != null) return m; } return searchInterfaces(clazz, name, desc); } private static Method searchInterfaces(Class clazz, String name, String desc) { Method m = null; Class[] interfaces = clazz.getInterfaces(); for (int i = 0; i < interfaces.length; i++) { m = findSuperMethod2(interfaces[i], name, desc); if (m != null) return m; } return m; } private static Method findMethod2(Class clazz, String name, String desc) { Method[] methods = SecurityActions.getDeclaredMethods(clazz); int n = methods.length; for (int i = 0; i < n; i++) if (methods[i].getName().equals(name) && makeDescriptor(methods[i]).equals(desc)) return methods[i]; return null; } /** * Makes a descriptor for a given method. */ public static String makeDescriptor(Method m) { Class[] params = m.getParameterTypes(); return makeDescriptor(params, m.getReturnType()); } /** * Makes a descriptor for a given method. * * @param params parameter types. * @param retType return type. */ public static String makeDescriptor(Class[] params, Class retType) { StringBuffer sbuf = new StringBuffer(); sbuf.append('('); for (int i = 0; i < params.length; i++) makeDesc(sbuf, params[i]); sbuf.append(')'); if (retType != null) makeDesc(sbuf, retType); return sbuf.toString(); } /** * Makes a descriptor for a given method. * * @param params the descriptor of parameter types. * @param retType return type. */ public static String makeDescriptor(String params, Class retType) { StringBuffer sbuf = new StringBuffer(params); makeDesc(sbuf, retType); return sbuf.toString(); } private static void makeDesc(StringBuffer sbuf, Class type) { if (type.isArray()) { sbuf.append('['); makeDesc(sbuf, type.getComponentType()); } else if (type.isPrimitive()) { if (type == Void.TYPE) sbuf.append('V'); else if (type == Integer.TYPE) sbuf.append('I'); else if (type == Byte.TYPE) sbuf.append('B'); else if (type == Long.TYPE) sbuf.append('J'); else if (type == Double.TYPE) sbuf.append('D'); else if (type == Float.TYPE) sbuf.append('F'); else if (type == Character.TYPE) sbuf.append('C'); else if (type == Short.TYPE) sbuf.append('S'); else if (type == Boolean.TYPE) sbuf.append('Z'); else throw new RuntimeException("bad type: " + type.getName()); } else sbuf.append('L').append(type.getName().replace('.', '/')) .append(';'); } /** * Converts a proxy object to an object that is writable to an * object stream. This method is called by writeReplace() * in a proxy class. * * @since 3.4 */ public static SerializedProxy makeSerializedProxy(Object proxy) throws java.io.InvalidClassException { Class clazz = proxy.getClass(); MethodHandler methodHandler = null; if (proxy instanceof ProxyObject) methodHandler = ((ProxyObject)proxy).getHandler(); else if (proxy instanceof Proxy) methodHandler = ProxyFactory.getHandler((Proxy)proxy); return new SerializedProxy(clazz, ProxyFactory.getFilterSignature(clazz), methodHandler); } }




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