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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