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 * The repository maintains information about which classes have
66 * been loaded.
67 *
68 * It loads its data from the ClassLoader implementation
69 * passed into its constructor.
70 *
71 * @see org.apache.bcel.Repository
72 *
73 * @version $Id: ClassLoaderRepository.java,v 1.4 2002/10/11 20:34:47 mdahm Exp $
74 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
75 * @author David Dixon-Peugh
76 */
77 public class ClassLoaderRepository
78 implements Repository
79 {
80 private java.lang.ClassLoader loader;
81 private HashMap loadedClasses =
82 new HashMap(); // CLASSNAME X JAVACLASS
83
84 public ClassLoaderRepository( java.lang.ClassLoader loader ) {
85 this.loader = loader;
86 }
87
88 /***
89 * Store a new JavaClass into this Repository.
90 */
91 public void storeClass( JavaClass clazz ) {
92 loadedClasses.put( clazz.getClassName(),
93 clazz );
94 clazz.setRepository( this );
95 }
96
97 /***
98 * Remove class from repository
99 */
100 public void removeClass(JavaClass clazz) {
101 loadedClasses.remove(clazz.getClassName());
102 }
103
104 /***
105 * Find an already defined JavaClass.
106 */
107 public JavaClass findClass( String className ) {
108 if ( loadedClasses.containsKey( className )) {
109 return (JavaClass) loadedClasses.get( className );
110 } else {
111 return null;
112 }
113 }
114
115 /***
116 * Lookup a JavaClass object from the Class Name provided.
117 */
118 public JavaClass loadClass( String className )
119 throws ClassNotFoundException
120 {
121 String classFile = className.replace('.', '/');
122
123 JavaClass RC = findClass( className );
124 if (RC != null) { return RC; }
125
126 try {
127 InputStream is =
128 loader.getResourceAsStream( classFile + ".class" );
129
130 if(is == null) {
131 throw new ClassNotFoundException(className + " not found.");
132 }
133
134 ClassParser parser = new ClassParser( is, className );
135 RC = parser.parse();
136
137 storeClass( RC );
138
139 return RC;
140 } catch (IOException e) {
141 throw new ClassNotFoundException( e.toString() );
142 }
143 }
144
145 public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
146 return loadClass(clazz.getName());
147 }
148
149 /*** Clear all entries from cache.
150 */
151 public void clear() {
152 loadedClasses.clear();
153 }
154 }
155
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