1 package org.apache.bcel.util;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache BCEL" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache BCEL", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.io.*;
58
59 import java.util.Map;
60 import java.util.HashMap;
61
62 import org.apache.bcel.classfile.*;
63
64 /***
65 * This repository is used in situations where a Class is created
66 * outside the realm of a ClassLoader. Classes are loaded from
67 * the file systems using the paths specified in the given
68 * class path. By default, this is the value returned by
69 * ClassPath.getClassPath().
70 * <br>
71 * It is designed to be used as a singleton, however it
72 * can also be used with custom classpaths.
73 *
74 /**
75 * Abstract definition of a class repository. Instances may be used
76 * to load classes from different sources and may be used in the
77 * Repository.setRepository method.
78 *
79 * @see org.apache.bcel.Repository
80 *
81 * @version $Id: SyntheticRepository.java,v 1.6 2002/11/10 18:30:05 mdahm Exp $
82 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
83 * @author David Dixon-Peugh
84 */
85 public class SyntheticRepository implements Repository {
86 private static final String DEFAULT_PATH = ClassPath.getClassPath();
87
88 private static HashMap _instances = new HashMap(); // CLASSPATH X REPOSITORY
89
90 private ClassPath _path = null;
91 private HashMap _loadedClasses = new HashMap(); // CLASSNAME X JAVACLASS
92
93 private SyntheticRepository(ClassPath path) {
94 _path = path;
95 }
96
97 public static SyntheticRepository getInstance() {
98 return getInstance(ClassPath.SYSTEM_CLASS_PATH);
99 }
100
101 public static SyntheticRepository getInstance(ClassPath classPath) {
102 SyntheticRepository rep = (SyntheticRepository)_instances.get(classPath);
103
104 if(rep == null) {
105 rep = new SyntheticRepository(classPath);
106 _instances.put(classPath, rep);
107 }
108
109 return rep;
110 }
111
112 /***
113 * Store a new JavaClass instance into this Repository.
114 */
115 public void storeClass(JavaClass clazz) {
116 _loadedClasses.put(clazz.getClassName(), clazz);
117 clazz.setRepository(this);
118 }
119
120 /***
121 * Remove class from repository
122 */
123 public void removeClass(JavaClass clazz) {
124 _loadedClasses.remove(clazz.getClassName());
125 }
126
127 /***
128 * Find an already defined (cached) JavaClass object by name.
129 */
130 public JavaClass findClass(String className) {
131 return (JavaClass)_loadedClasses.get(className);
132 }
133
134 /***
135 * Load a JavaClass object for the given class name using
136 * the CLASSPATH environment variable.
137 */
138 public JavaClass loadClass(String className)
139 throws ClassNotFoundException
140 {
141 if(className == null || className.equals("")) {
142 throw new IllegalArgumentException("Invalid class name " + className);
143 }
144
145 className = className.replace('/', '.'); // Just in case, canonical form
146
147 try {
148 return loadClass(_path.getInputStream(className), className);
149 } catch(IOException e) {
150 throw new ClassNotFoundException("Exception while looking for class " +
151 className + ": " + e.toString());
152 }
153 }
154
155 /***
156 * Try to find class source via getResourceAsStream().
157 * @see Class
158 * @return JavaClass object for given runtime class
159 */
160 public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
161 String className = clazz.getName();
162 String name = className;
163 int i = name.lastIndexOf('.');
164
165 if(i > 0) {
166 name = name.substring(i + 1);
167 }
168
169 return loadClass(clazz.getResourceAsStream(name + ".class"), className);
170 }
171
172 private JavaClass loadClass(InputStream is, String className)
173 throws ClassNotFoundException
174 {
175 JavaClass clazz = findClass(className);
176
177 if(clazz != null) {
178 return clazz;
179 }
180
181 try {
182 if(is != null) {
183 ClassParser parser = new ClassParser(is, className);
184 clazz = parser.parse();
185
186 storeClass(clazz);
187
188 return clazz;
189 }
190 } catch(IOException e) {
191 throw new ClassNotFoundException("Exception while looking for class " +
192 className + ": " + e.toString());
193 }
194
195 throw new ClassNotFoundException("SyntheticRepository could not load " +
196 className);
197 }
198
199 /*** Clear all entries from cache.
200 */
201 public void clear() {
202 _loadedClasses.clear();
203 }
204 }
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