JARSoundbankReader.java revision 13376:7b8890408366 
1/*
2 * Copyright (c) 2007, 2015, 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
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.media.sound;
27
28import java.io.BufferedReader;
29import java.io.File;
30import java.io.IOException;
31import java.io.InputStream;
32import java.io.InputStreamReader;
33import java.net.URL;
34import java.net.URLClassLoader;
35import java.util.ArrayList;
36import java.util.Objects;
37
38import javax.sound.midi.InvalidMidiDataException;
39import javax.sound.midi.Soundbank;
40import javax.sound.midi.spi.SoundbankReader;
41
42import sun.reflect.misc.ReflectUtil;
43
44/**
45 * JarSoundbankReader is used to read soundbank object from jar files.
46 *
47 * @author Karl Helgason
48 */
49public final class JARSoundbankReader extends SoundbankReader {
50
51    private static boolean isZIP(URL url) {
52        boolean ok = false;
53        try {
54            InputStream stream = url.openStream();
55            try {
56                byte[] buff = new byte[4];
57                ok = stream.read(buff) == 4;
58                if (ok) {
59                    ok =  (buff[0] == 0x50
60                        && buff[1] == 0x4b
61                        && buff[2] == 0x03
62                        && buff[3] == 0x04);
63                }
64            } finally {
65                stream.close();
66            }
67        } catch (IOException e) {
68        }
69        return ok;
70    }
71
72    public Soundbank getSoundbank(URL url)
73            throws InvalidMidiDataException, IOException {
74        if (!isZIP(url))
75            return null;
76        ArrayList<Soundbank> soundbanks = new ArrayList<Soundbank>();
77        URLClassLoader ucl = URLClassLoader.newInstance(new URL[]{url});
78        InputStream stream = ucl.getResourceAsStream(
79                "META-INF/services/javax.sound.midi.Soundbank");
80        if (stream == null)
81            return null;
82        try
83        {
84            BufferedReader r = new BufferedReader(new InputStreamReader(stream));
85            String line = r.readLine();
86            while (line != null) {
87                if (!line.startsWith("#")) {
88                    try {
89                        Class<?> c = Class.forName(line.trim(), false, ucl);
90                        if (Soundbank.class.isAssignableFrom(c)) {
91                            Object o = ReflectUtil.newInstance(c);
92                            soundbanks.add((Soundbank) o);
93                        }
94                    } catch (ClassNotFoundException ignored) {
95                    } catch (InstantiationException ignored) {
96                    } catch (IllegalAccessException ignored) {
97                    }
98                }
99                line = r.readLine();
100            }
101        }
102        finally
103        {
104            stream.close();
105        }
106        if (soundbanks.size() == 0)
107            return null;
108        if (soundbanks.size() == 1)
109            return soundbanks.get(0);
110        SimpleSoundbank sbk = new SimpleSoundbank();
111        for (Soundbank soundbank : soundbanks)
112            sbk.addAllInstruments(soundbank);
113        return sbk;
114    }
115
116    public Soundbank getSoundbank(InputStream stream)
117            throws InvalidMidiDataException, IOException {
118        Objects.requireNonNull(stream);
119        return null;
120    }
121
122    public Soundbank getSoundbank(File file)
123            throws InvalidMidiDataException, IOException {
124        return getSoundbank(file.toURI().toURL());
125    }
126}
127