1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2002 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
25 *
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>;.
53 */
54 package samples;
55 import net.sf.cglib.*;
56 import java.io.Serializable;
57 import java.util.*;
58 import java.lang.reflect.*;
59
60 /***
61 * This class is meant to be used as a drop-in replacement for
62 * <code>java.lang.reflect.Proxy</code>.
63 * There are some known subtle differences:
64 * <ul>
65 * <li>The exceptions returned by invoking <code>getExceptionTypes</code>
66 * on the <code>Method</code> passed to the <code>invoke</code> method
67 * <b>are</b> the exact set that can be thrown without resulting in an
68 * <code>UndeclaredThrowableException</code> being thrown.
69 * <li>There is no protected constructor which accepts an
70 * <code>InvocationHandler</code>. Instead, use the more convenient
71 * <code>newProxyInstance</code> static method.
72 * <li><code>net.sf.cglib.UndeclaredThrowableException</code> is used instead
73 * of <code>java.lang.reflect.UndeclaredThrowableException</code>.
74 * </ul>
75 * @author Chris Nokleberg <a href="mailto:chris@nokleberg.com">chris@nokleberg.com</a>
76 * @version $Id: JdkCompatibleProxy.java,v 1.3 2003/01/24 00:27:44 herbyderby Exp $
77 */
78 public class JdkCompatibleProxy implements Serializable {
79 private static final Class thisClass = JdkCompatibleProxy.class;
80 private static final HandlerAdapter nullInterceptor = new HandlerAdapter(null);
81 private static Map generatedClasses = Collections.synchronizedMap( new WeakHashMap() );
82
83 private static class HandlerAdapter implements MethodInterceptor {
84 private InvocationHandler handler;
85 public HandlerAdapter(InvocationHandler handler) {
86 this.handler = handler;
87 }
88
89 public Object aroundAdvice(Object obj, Method method, Object[] args,
90 MethodProxy proxy) throws Throwable {
91 return handler.invoke(obj, method, args);
92 }
93 }
94
95 protected JdkCompatibleProxy() {
96 }
97
98 public static InvocationHandler getInvocationHandler(Object proxy) {
99 return ((HandlerAdapter)((Factory)proxy).getInterceptor()).handler;
100 }
101
102 public static Class getProxyClass(ClassLoader loader, Class[] interfaces) {
103 Class cls = Enhancer.enhance(thisClass, interfaces, nullInterceptor, loader).getClass();
104 generatedClasses.put(cls, null);
105 return cls;
106 }
107
108 public static boolean isProxyClass(Class cl) {
109 return generatedClasses.containsKey(cl);
110 }
111
112 public static Object newProxyInstance(ClassLoader loader, Class[] interfaces, InvocationHandler h) {
113 Object obj = Enhancer.enhance(thisClass, interfaces, new HandlerAdapter(h), loader);
114 generatedClasses.put(obj.getClass(), null);
115 return obj;
116 }
117 }
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