ResourceClassFileDataLoader


1   /*
2    *  Copyright 2004 Brian S O'Neill
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   */
16  
17  package org.cojen.classfile;
18  
19  import java.io.InputStream  ;
20  
21  /**
22   * {@link ClassFileDataLoader} implementation that loads class file data as
23   * resources from a ClassLoader.
24   *
25   * @author Brian S O'Neill
26   */
27  public class ResourceClassFileDataLoader implements ClassFileDataLoader {
28      private final ClassLoader   mLoader;
29  
30      /**
31       * Loads resources using the ClassLoader that loaded this class.
32       */
33      public ResourceClassFileDataLoader() {
34          mLoader = getClass().getClassLoader();
35      }
36  
37      /**
38       * @param loader ClassLoader for finding resources; if null, use system
39       * ClassLoader.
40       */
41      public ResourceClassFileDataLoader(ClassLoader   loader) {
42          mLoader = loader;
43      }
44  
45      public InputStream   getClassData(String   name) {
46          name = name.replace('.', '/') + ".class";
47  
48          InputStream   in;
49          if (mLoader == null) {
50              in = ClassLoader.getSystemResourceAsStream(name);
51          } else {
52              in = mLoader.getResourceAsStream(name);
53          }
54  
55          return in;
56      }
57  }
58
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