001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.bcel.util;
019
020import java.util.HashMap;
021import java.util.Map;
022
023/**
024 * 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
025 * specified in the given class path. By default, this is the value returned by ClassPath.getClassPath(). <br>
026 * 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
027 * classpath.
028 *
029 * @see org.apache.bcel.Repository
030 *
031 * @version $Id: SyntheticRepository.java 1748124 2016-06-13 08:02:16Z ggregory $
032 */
033public class SyntheticRepository extends MemorySensitiveClassPathRepository {
034
035    // private static final String DEFAULT_PATH = ClassPath.getClassPath();
036    private static final Map<ClassPath, SyntheticRepository> instances = new HashMap<>(); // CLASSPATH X REPOSITORY
037
038    private SyntheticRepository(final ClassPath path) {
039        super(path);
040    }
041
042    public static SyntheticRepository getInstance() {
043        return getInstance(ClassPath.SYSTEM_CLASS_PATH);
044    }
045
046    public static SyntheticRepository getInstance(final ClassPath classPath) {
047        SyntheticRepository rep = instances.get(classPath);
048        if (rep == null) {
049            rep = new SyntheticRepository(classPath);
050            instances.put(classPath, rep);
051        }
052        return rep;
053    }
054}