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.reflect;
55
56 import net.sf.cglib.core.*;
57 import java.lang.reflect.Constructor;
58 import java.lang.reflect.InvocationTargetException;
59 import java.lang.reflect.Method;
60 import org.objectweb.asm.ClassVisitor;
61 import org.objectweb.asm.Type;
62
63 abstract public class FastClass
64 {
65 private Class type;
66
67 protected FastClass(Class type) {
68 this.type = type;
69 }
70
71 public static FastClass create(Class type) {
72 Generator gen = new Generator();
73 gen.setType(type);
74 return gen.create();
75 }
76
77 public static class Generator extends AbstractClassGenerator
78 {
79 private static final Source SOURCE = new Source(FastClass.class.getName());
80 private Class type;
81
82 public Generator() {
83 super(SOURCE);
84 }
85
86 public void setType(Class type) {
87 this.type = type;
88 }
89
90 public FastClass create() {
91 setNamePrefix(type.getName());
92 return (FastClass)super.create(type.getName());
93 }
94
95 protected ClassLoader getDefaultClassLoader() {
96 return type.getClassLoader();
97 }
98
99 public void generateClass(ClassVisitor v) throws Exception {
100 new FastClassEmitter(v, getClassName(), type);
101 }
102
103 protected Object firstInstance(Class type) {
104 return ReflectUtils.newInstance(type,
105 new Class[]{ Class.class },
106 new Object[]{ this.type });
107 }
108
109 protected Object nextInstance(Object instance) {
110 return instance;
111 }
112 }
113
114 public Object invoke(String name, Class[] parameterTypes, Object obj, Object[] args) throws InvocationTargetException {
115 return invoke(getIndex(name, parameterTypes), obj, args);
116 }
117
118 public Object newInstance() throws InvocationTargetException {
119 return newInstance(getIndex(Constants.EMPTY_CLASS_ARRAY), null);
120 }
121
122 public Object newInstance(Class[] parameterTypes, Object[] args) throws InvocationTargetException {
123 return newInstance(getIndex(parameterTypes), args);
124 }
125
126 public FastMethod getMethod(Method method) {
127 return new FastMethod(this, method);
128 }
129
130 public FastConstructor getConstructor(Constructor constructor) {
131 return new FastConstructor(this, constructor);
132 }
133
134 public FastMethod getMethod(String name, Class[] parameterTypes) {
135 try {
136 return getMethod(type.getMethod(name, parameterTypes));
137 } catch (NoSuchMethodException e) {
138 throw new NoSuchMethodError(e.getMessage());
139 }
140 }
141
142 public FastConstructor getConstructor(Class[] parameterTypes) {
143 try {
144 return getConstructor(type.getConstructor(parameterTypes));
145 } catch (NoSuchMethodException e) {
146 throw new NoSuchMethodError(e.getMessage());
147 }
148 }
149
150 public String getName() {
151 return type.getName();
152 }
153
154 public Class getJavaClass() {
155 return type;
156 }
157
158 public String toString() {
159 return type.toString();
160 }
161
162 public int hashCode() {
163 return type.hashCode();
164 }
165
166 public boolean equals(Object o) {
167 if (o == null || !(o instanceof FastClass)) {
168 return false;
169 }
170 return type.equals(((FastClass)o).type);
171 }
172
173 /***
174 * Return the index of the matching method. The index may be used
175 * later to invoke the method with less overhead. If more than one
176 * method matches (i.e. they differ by return type only), one is
177 * chosen arbitrarily.
178 * @see #invoke(int, Object, Object[])
179 * @param name the method name
180 * @param parameterTypes the parameter array
181 * @return the index, or <code>-1</code> if none is found.
182 */
183 abstract public int getIndex(String name, Class[] parameterTypes);
184
185 /***
186 * Return the index of the matching constructor. The index may be used
187 * later to create a new instance with less overhead.
188 * @see #newInstance(int, Object[])
189 * @param parameterTypes the parameter array
190 * @return the constructor index, or <code>-1</code> if none is found.
191 */
192 abstract public int getIndex(Class[] parameterTypes);
193
194 /***
195 * Invoke the method with the specified index.
196 * @see getIndex(name, Class[])
197 * @param index the method index
198 * @param obj the object the underlying method is invoked from
199 * @param args the arguments used for the method call
200 * @throws java.lang.reflect.InvocationTargetException if the underlying method throws an exception
201 */
202 abstract public Object invoke(int index, Object obj, Object[] args) throws InvocationTargetException;
203
204 /***
205 * Create a new instance using the specified constructor index and arguments.
206 * @see getIndex(Class[])
207 * @param index the constructor index
208 * @param args the arguments passed to the constructor
209 * @throws java.lang.reflect.InvocationTargetException if the constructor throws an exception
210 */
211 abstract public Object newInstance(int index, Object[] args) throws InvocationTargetException;
212
213 abstract public int getIndex(Signature sig);
214
215 /***
216 * Returns the maximum method index for this class.
217 */
218 abstract public int getMaxIndex();
219
220 protected static String getSignatureWithoutReturnType(String name, Class[] parameterTypes) {
221 StringBuffer sb = new StringBuffer();
222 sb.append(name);
223 sb.append('(');
224 for (int i = 0; i < parameterTypes.length; i++) {
225 sb.append(Type.getDescriptor(parameterTypes[i]));
226 }
227 sb.append(')');
228 return sb.toString();
229 }
230 }
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