    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 */
    017package org.apache.bcel.util;
    018
    019import java.util.Map;
    020import java.util.concurrent.ConcurrentHashMap;
    021
    022/**
    023 * This repository is used in situations where a Class is created outside the realm of a ClassLoader. Classes are loaded
    024 * from the file systems using the paths specified in the given class path. By default, this is the value returned by
    025 * ClassPath.getClassPath().
    026 * <p>
    027 * This repository uses a factory design, allowing it to maintain a collection of different classpaths, and as such It
    028 * is designed to be used as a singleton per classpath.
    029 * </p>
    030 *
    031 * @see org.apache.bcel.Repository
    032 */
    033public class SyntheticRepository extends MemorySensitiveClassPathRepository {
    034
    035    private static final Map<ClassPath, SyntheticRepository> MAP = new ConcurrentHashMap<>(); // CLASSPATH X REPOSITORY
    036
    037    public static SyntheticRepository getInstance() {
    038        return getInstance(ClassPath.SYSTEM_CLASS_PATH);
    039    }
    040
    041    public static SyntheticRepository getInstance(final ClassPath classPath) {
    042        return MAP.computeIfAbsent(classPath, SyntheticRepository::new);
    043    }
    044
    045    private SyntheticRepository(final ClassPath path) {
    046        super(path);
    047    }
    048}