1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * https://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.bcel.util;
20
21 import java.util.Map;
22 import java.util.concurrent.ConcurrentHashMap;
23
24 /**
25 * This repository is used in situations where a Class is created outside the realm of a ClassLoader. Classes are loaded
26 * from the file systems using the paths specified in the given class path. By default, this is the value returned by
27 * ClassPath.getClassPath().
28 * <p>
29 * This repository uses a factory design, allowing it to maintain a collection of different classpaths, and as such It
30 * is designed to be used as a singleton per classpath.
31 * </p>
32 *
33 * @see org.apache.bcel.Repository
34 */
35 public class SyntheticRepository extends MemorySensitiveClassPathRepository {
36
37 private static final Map<ClassPath, SyntheticRepository> MAP = new ConcurrentHashMap<>(); // CLASSPATH X REPOSITORY
38
39 public static SyntheticRepository getInstance() {
40 return getInstance(ClassPath.SYSTEM_CLASS_PATH);
41 }
42
43 public static SyntheticRepository getInstance(final ClassPath classPath) {
44 return MAP.computeIfAbsent(classPath, SyntheticRepository::new);
45 }
46
47 private SyntheticRepository(final ClassPath path) {
48 super(path);
49 }
50 }