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;
55
56 import java.lang.reflect.Constructor;
57 import java.lang.reflect.Modifier;
58 import java.util.*;
59 import net.sf.cglib.core.*;
60 import org.objectweb.asm.ClassVisitor;
61
62 /***
63 * <code>Mixin</code> allows
64 * multiple objects to be combined into a single larger object. The
65 * methods in the generated object simply call the original methods in the
66 * underlying "delegate" objects.
67 * @author Chris Nokleberg
68 * @version $Id: Mixin.java,v 1.14 2003/10/03 23:09:29 herbyderby Exp $
69 */
70 abstract public class Mixin {
71 private static final MixinKey KEY_FACTORY =
72 (MixinKey)KeyFactory.create(MixinKey.class, KeyFactory.CLASS_BY_NAME);
73 private static final Map ROUTE_CACHE = Collections.synchronizedMap(new HashMap());
74
75 interface MixinKey {
76 public Object newInstance(Class[] classes, int[] route);
77 }
78
79 abstract public Mixin newInstance(Object[] delegates);
80
81 public static Mixin create(Object[] delegates) {
82 Generator gen = new Generator();
83 gen.setDelegates(delegates);
84 return gen.create();
85 }
86
87 public static Mixin create(Class[] interfaces, Object[] delegates) {
88 Generator gen = new Generator();
89 gen.setClasses(interfaces);
90 gen.setDelegates(delegates);
91 return gen.create();
92 }
93
94 public static Mixin createBean(Object[] beans) {
95 Generator gen = new Generator();
96 gen.setAsBeans(true);
97 gen.setDelegates(beans);
98 return gen.create();
99 }
100
101 public static class Generator extends AbstractClassGenerator {
102 private static final Source SOURCE = new Source(Mixin.class.getName());
103
104 private Class[] classes;
105 private Object[] delegates;
106 private int[] route;
107 private boolean asBeans;
108
109 public Generator() {
110 super(SOURCE);
111 }
112
113 protected ClassLoader getDefaultClassLoader() {
114 return delegates[0].getClass().getClassLoader(); // is this right?
115 }
116
117 public void setAsBeans(boolean asBeans) {
118 this.asBeans = asBeans;
119 }
120
121 public void setClasses(Class[] classes) {
122 this.classes = classes;
123 }
124
125 public void setDelegates(Object[] delegates) {
126 this.delegates = delegates;
127 }
128
129 public void setRoute(int[] route) {
130 this.route = route;
131 }
132
133 public Mixin create() {
134 if (classes == null) {
135 if (asBeans) {
136 classes = ReflectUtils.getClasses(delegates);
137 route = null;
138 } else {
139 Route r = route(delegates);
140 classes = r.classes;
141 route = r.route;
142 }
143 }
144 setNamePrefix(classes[ReflectUtils.findPackageProtected(classes)].getName());
145 return (Mixin)super.create(KEY_FACTORY.newInstance(classes, route));
146 }
147
148 public void generateClass(ClassVisitor v) {
149 if (asBeans) {
150 new MixinBeanEmitter(v, getClassName(), classes);
151 } else {
152 new MixinEmitter(v, getClassName(), classes, route);
153 }
154 }
155
156 protected Object firstInstance(Class type) {
157 return ((Mixin)ReflectUtils.newInstance(type)).newInstance(delegates);
158 }
159
160 protected Object nextInstance(Object instance) {
161 return ((Mixin)instance).newInstance(delegates);
162 }
163 }
164
165 public static Class[] getClasses(Object[] delegates) {
166 return (Class[])route(delegates).classes.clone();
167 }
168
169 public static int[] getRoute(Object[] delegates) {
170 return (int[])route(delegates).route.clone();
171 }
172
173 private static Route route(Object[] delegates) {
174 Object key = ClassesKey.create(delegates);
175 Route route = (Route)ROUTE_CACHE.get(key);
176 if (route == null) {
177 ROUTE_CACHE.put(key, route = new Route(delegates));
178 }
179 return route;
180 }
181
182 private static class Route
183 {
184 private Class[] classes;
185 private int[] route;
186
187 Route(Object[] delegates) {
188 Map map = new HashMap();
189 ArrayList collect = new ArrayList();
190 for (int i = 0; i < delegates.length; i++) {
191 Class delegate = delegates[i].getClass();
192 collect.clear();
193 collectAllInterfaces(delegate, collect);
194 for (Iterator it = collect.iterator(); it.hasNext();) {
195 Class iface = (Class)it.next();
196 if (!map.containsKey(iface)) {
197 map.put(iface, new Integer(i));
198 }
199 }
200 }
201 classes = new Class[map.size()];
202 route = new int[map.size()];
203 int index = 0;
204 for (Iterator it = map.keySet().iterator(); it.hasNext();) {
205 Class key = (Class)it.next();
206 classes[index] = key;
207 route[index] = ((Integer)map.get(key)).intValue();
208 index++;
209 }
210 }
211 }
212
213 private static void collectAllInterfaces(Class type, List list) {
214 if (!type.equals(Object.class)) {
215 list.addAll(Arrays.asList(type.getInterfaces()));
216 collectAllInterfaces(type.getSuperclass(), list);
217 }
218 }
219 }
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