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
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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 net.sf.cglib.proxy;
55
56 import java.io.Serializable;
57 import java.lang.reflect.Method;
58 import java.lang.reflect.Member;
59 import net.sf.cglib.core.CodeGenerationException;
60
61 /***
62 * This class is meant to be used as replacement for
63 * <code>java.lang.reflect.Proxy</code> under JDK 1.2. There are some known
64 * subtle differences:
65 * <ul>
66 * <li>The exceptions returned by invoking <code>getExceptionTypes</code>
67 * on the <code>Method</code> passed to the <code>invoke</code> method
68 * <b>are</b> the exact set that can be thrown without resulting in an
69 * <code>UndeclaredThrowableException</code> being thrown.
70 * <li>{@link UndeclaredThrowableException} is used instead
71 * of <code>java.lang.reflect.UndeclaredThrowableException</code>.
72 * </ul>
73 * <p>
74 * @version $Id: Proxy.java,v 1.4 2003/12/07 00:54:36 herbyderby Exp $
75 */
76 public class Proxy implements Serializable {
77 protected InvocationHandler h;
78
79 private static final CallbackFilter BAD_OBJECT_METHOD_FILTER = new CallbackFilter() {
80 public int accept(Method method) {
81 if (method.getDeclaringClass().getName().equals("java.lang.Object")) {
82 String name = method.getName();
83 if (!(name.equals("hashCode") ||
84 name.equals("equals") ||
85 name.equals("toString"))) {
86 return 1;
87 }
88 }
89 return 0;
90 }
91 };
92
93 protected Proxy(InvocationHandler h) {
94 EnhancerEmitter.setThreadCallbacks(getClass(), new Callback[]{ h, null });
95 this.h = h;
96 }
97
98 // private for security of isProxyClass
99 private static class ProxyImpl extends Proxy {
100 protected ProxyImpl(InvocationHandler h) {
101 super(h);
102 }
103 }
104
105 public static InvocationHandler getInvocationHandler(Object proxy) {
106 if (!(proxy instanceof ProxyImpl)) {
107 throw new IllegalArgumentException("Object is not a proxy");
108 }
109 return ((Proxy)proxy).h;
110 }
111
112 public static Class getProxyClass(ClassLoader loader, Class[] interfaces) {
113 Enhancer e = new Enhancer();
114 e.setSuperclass(ProxyImpl.class);
115 e.setInterfaces(interfaces);
116 e.setCallbackTypes(new Class[]{
117 InvocationHandler.class,
118 NoOp.class,
119 });
120 e.setCallbackFilter(BAD_OBJECT_METHOD_FILTER);
121 e.setUseFactory(false);
122 return e.createClass();
123 }
124
125 public static boolean isProxyClass(Class cl) {
126 return cl.getSuperclass().equals(ProxyImpl.class);
127 }
128
129 public static Object newProxyInstance(ClassLoader loader, Class[] interfaces, InvocationHandler h) {
130 try {
131 Class clazz = getProxyClass(loader, interfaces);
132 return clazz.getConstructor(new Class[]{ InvocationHandler.class }).newInstance(new Object[]{ h });
133 } catch (RuntimeException e) {
134 throw e;
135 } catch (Exception e) {
136 throw new CodeGenerationException(e);
137 }
138 }
139 }
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