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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.util.HashMap;
21  import java.util.Map;
22  
23  /**
24   * This repository is used in situations where a Class is created outside the realm of a ClassLoader. Classes are loaded from the file systems using the paths
25   * specified in the given class path. By default, this is the value returned by ClassPath.getClassPath(). <br>
26   * This repository uses a factory design, allowing it to maintain a collection of different classpaths, and as such It is designed to be used as a singleton per
27   * classpath.
28   *
29   * @see org.apache.bcel.Repository
30   *
31   * @version $Id: SyntheticRepository.html 1018313 2017-09-18 09:03:04Z britter $
32   */
33  public class SyntheticRepository extends MemorySensitiveClassPathRepository {
34  
35      // private static final String DEFAULT_PATH = ClassPath.getClassPath();
36      private static final Map<ClassPath, SyntheticRepository> instances = new HashMap<>(); // CLASSPATH X REPOSITORY
37  
38      private SyntheticRepository(final ClassPath path) {
39          super(path);
40      }
41  
42      public static SyntheticRepository getInstance() {
43          return getInstance(ClassPath.SYSTEM_CLASS_PATH);
44      }
45  
46      public static SyntheticRepository getInstance(final ClassPath classPath) {
47          SyntheticRepository rep = instances.get(classPath);
48          if (rep == null) {
49              rep = new SyntheticRepository(classPath);
50              instances.put(classPath, rep);
51          }
52          return rep;
53      }
54  }