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 $Id$
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 
SyntheticRepository(final ClassPath path)38     private SyntheticRepository(final ClassPath path) {
39         super(path);
40     }
41 
getInstance()42     public static SyntheticRepository getInstance() {
43         return getInstance(ClassPath.SYSTEM_CLASS_PATH);
44     }
45 
getInstance(final ClassPath classPath)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 }
55