/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
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 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 5. Products derived from this software may not be called "Apache",
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 * This software consists of voluntary contributions made by many
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 */
import net.sf.cglib.*;
import java.io.Serializable;
import java.util.*;
import java.lang.reflect.*;

/**
 * This class is meant to be used as a drop-in replacement for
 * <code>java.lang.reflect.Proxy</code>.
 * There are some known subtle differences:
 * <ul>
 * <li>The exceptions returned by invoking <code>getExceptionTypes</code>
 * on the <code>Method</code> passed to the <code>invoke</code> method
 * <b>are</b> the exact set that can be thrown without resulting in an
 * <code>UndeclaredThrowableException</code> being thrown.
 * <li>There is no protected constructor which accepts an
 * <code>InvocationHandler</code>. Instead, use the more convenient
 * <code>newProxyInstance</code> static method.
 * <li><code>net.sf.cglib.UndeclaredThrowableException</code> is used instead
 * of <code>java.lang.reflect.UndeclaredThrowableException</code>.
 * </ul> 
 * @author Chris Nokleberg <a href="mailto:chris@nokleberg.com">chris@nokleberg.com</a>
 * @version $Id: JdkCompatibleProxy.java,v 1.1 2002/12/14 02:56:16 herbyderby Exp $
 */
public class JdkCompatibleProxy implements Serializable {
    private static final Class thisClass = JdkCompatibleProxy.class;
    private static final HandlerAdapter nullInterceptor = new HandlerAdapter(null);

    private static class HandlerAdapter implements MethodInterceptor {
        private InvocationHandler handler;
        public HandlerAdapter(InvocationHandler handler) {
            this.handler = handler;
        }

        public Object aroundAdvice(Object obj, Method method, Object[] args,
                                   MethodProxy proxy) throws Throwable {
            return handler.invoke(obj, method, args);
        }
    }

    protected InvocationHandler h;

    protected JdkCompatibleProxy(MethodInterceptor mi) {
        HandlerAdapter adapter = (HandlerAdapter)mi;
        if (adapter != null)
            h = adapter.handler;
    }

    public static InvocationHandler getInvocationHandler(Object proxy) {
        return ((HandlerAdapter)((Factory)proxy).getInterceptor()).handler;
    }

    public static Class getProxyClass(ClassLoader loader, Class[] interfaces) {
        return Enhancer.enhance(thisClass, interfaces, nullInterceptor, loader).getClass();
    }

    public static boolean isProxyClass(Class cl) {
        return cl.getSuperclass().getName().equals(thisClass.getName());
    }

    public static Object newProxyInstance(ClassLoader loader, Class[] interfaces, InvocationHandler h) {
        return Enhancer.enhance(thisClass, interfaces, new HandlerAdapter(h), loader);
    }        
}

Move JdkCompatibleProxy to samples