    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}