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 package org.apache.bcel.util;
18
19 import java.util.Map;
20 import java.util.concurrent.ConcurrentHashMap;
21
22 /**
23 * This repository is used in situations where a Class is created outside the realm of a ClassLoader. Classes are loaded
24 * from the file systems using the paths specified in the given class path. By default, this is the value returned by
25 * ClassPath.getClassPath().
26 * <p>
27 * This repository uses a factory design, allowing it to maintain a collection of different classpaths, and as such It
28 * is designed to be used as a singleton per classpath.
29 * </p>
30 *
31 * @see org.apache.bcel.Repository
32 */
33 public class SyntheticRepository extends MemorySensitiveClassPathRepository {
34
35 private static final Map<ClassPath, SyntheticRepository> MAP = new ConcurrentHashMap<>(); // CLASSPATH X REPOSITORY
36
37 public static SyntheticRepository getInstance() {
38 return getInstance(ClassPath.SYSTEM_CLASS_PATH);
39 }
40
41 public static SyntheticRepository getInstance(final ClassPath classPath) {
42 return MAP.computeIfAbsent(classPath, SyntheticRepository::new);
43 }
44
45 private SyntheticRepository(final ClassPath path) {
46 super(path);
47 }
48 }