1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements.  See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License.  You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  */
18 package org.apache.bcel.util;
19 
20 import java.io.IOException;
21 import java.io.InputStream;
22 import java.util.HashMap;
23 import java.util.Map;
24 
25 import org.apache.bcel.classfile.ClassParser;
26 import org.apache.bcel.classfile.JavaClass;
27 
28 /**
29  * The repository maintains information about which classes have
30  * been loaded.
31  *
32  * It loads its data from the ClassLoader implementation
33  * passed into its constructor.
34  *
35  * @see org.apache.bcel.Repository
36  *
37  * @version $Id$
38  */
39 public class ClassLoaderRepository implements Repository {
40 
41     private final java.lang.ClassLoader loader;
42     private final Map<String, JavaClass> loadedClasses = new HashMap<>(); // CLASSNAME X JAVACLASS
43 
44 
ClassLoaderRepository(final java.lang.ClassLoader loader)45     public ClassLoaderRepository(final java.lang.ClassLoader loader) {
46         this.loader = loader;
47     }
48 
49 
50     /**
51      * Store a new JavaClass into this Repository.
52      */
53     @Override
storeClass( final JavaClass clazz )54     public void storeClass( final JavaClass clazz ) {
55         loadedClasses.put(clazz.getClassName(), clazz);
56         clazz.setRepository(this);
57     }
58 
59 
60     /**
61      * Remove class from repository
62      */
63     @Override
removeClass( final JavaClass clazz )64     public void removeClass( final JavaClass clazz ) {
65         loadedClasses.remove(clazz.getClassName());
66     }
67 
68 
69     /**
70      * Find an already defined JavaClass.
71      */
72     @Override
findClass( final String className )73     public JavaClass findClass( final String className ) {
74         return loadedClasses.containsKey(className) ? loadedClasses.get(className) : null;
75     }
76 
77 
78     /**
79      * Lookup a JavaClass object from the Class Name provided.
80      */
81     @Override
loadClass(final String className)82     public JavaClass loadClass(final String className) throws ClassNotFoundException {
83         final String classFile = className.replace('.', '/');
84         JavaClass RC = findClass(className);
85         if (RC != null) {
86             return RC;
87         }
88         try (InputStream is = loader.getResourceAsStream(classFile + ".class")) {
89             if (is == null) {
90                 throw new ClassNotFoundException(className + " not found.");
91             }
92             final ClassParser parser = new ClassParser(is, className);
93             RC = parser.parse();
94             storeClass(RC);
95             return RC;
96         } catch (final IOException e) {
97             throw new ClassNotFoundException(className + " not found: " + e, e);
98         }
99     }
100 
101 
102     @Override
loadClass( final Class<?> clazz )103     public JavaClass loadClass( final Class<?> clazz ) throws ClassNotFoundException {
104         return loadClass(clazz.getName());
105     }
106 
107 
108     /** Clear all entries from cache.
109      */
110     @Override
clear()111     public void clear() {
112         loadedClasses.clear();
113     }
114 
115 
116     /*
117      * @return null
118      */
119     @Override
getClassPath()120     public ClassPath getClassPath() {
121         return null;
122     }
123 }
124