1/*
2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 * questions.
24 */
25package jdk.internal.jimage.decompressor;
26
27import java.io.IOException;
28import java.util.HashMap;
29import java.util.Map;
30import java.util.Properties;
31
32/**
33 *
34 * JLink Decompressors. All decompressors must be registered in the static
35 * initializer of this class.
36 *
37 * @implNote This class needs to maintain JDK 8 source compatibility.
38 *
39 * It is used internally in the JDK to implement jimage/jrtfs access,
40 * but also compiled and delivered as part of the jrtfs.jar to support access
41 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
42 */
43public final class ResourceDecompressorRepository {
44
45    private ResourceDecompressorRepository() {
46    }
47
48    private static final Map<String, ResourceDecompressorFactory> factories = new HashMap<>();
49
50    static {
51        registerReaderProvider(new ZipDecompressorFactory());
52        registerReaderProvider(new StringSharingDecompressorFactory());
53    }
54
55    /**
56     * Build a new decompressor for the passed name.
57     * @param properties Contains plugin configuration.
58     * @param name The plugin name to build.
59     * @return A decompressor or null if not found
60     * @throws IOException
61     */
62    public static ResourceDecompressor newResourceDecompressor(Properties properties,
63            String name) throws IOException {
64
65        ResourceDecompressorFactory fact = factories.get(name);
66        if (fact != null) {
67            return fact.newDecompressor(properties);
68        }
69        return null;
70    }
71
72    private static void registerReaderProvider(ResourceDecompressorFactory factory) {
73        factories.put(factory.getName(), factory);
74    }
75
76
77}
78