JarReader.java revision cfead78069f3dc32998dc118ee08cab3867acea2 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2011 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21package proguard.io;
22
23import java.io.IOException;
24import java.util.zip.*;
25
26/**
27 * This DataEntryReader lets a given DataEntryReader read all data entries of
28 * the read jar/war/zip data entries.
29 *
30 * @author Eric Lafortune
31 */
32public class JarReader implements DataEntryReader
33{
34    private final DataEntryReader dataEntryReader;
35
36
37    /**
38     * Creates a new JarReader.
39     */
40    public JarReader(DataEntryReader dataEntryReader)
41    {
42        this.dataEntryReader = dataEntryReader;
43    }
44
45
46    // Implementation for DataEntryReader.
47
48    public void read(DataEntry dataEntry) throws IOException
49    {
50        ZipInputStream zipInputStream = new ZipInputStream(dataEntry.getInputStream());
51
52        try
53        {
54            // Get all entries from the input jar.
55            while (true)
56            {
57                // Can we get another entry?
58                ZipEntry zipEntry = zipInputStream.getNextEntry();
59                if (zipEntry == null)
60                {
61                    break;
62                }
63
64                // Delegate the actual reading to the data entry reader.
65                dataEntryReader.read(new ZipDataEntry(dataEntry,
66                                                      zipEntry,
67                                                      zipInputStream));
68            }
69        }
70        finally
71        {
72            dataEntry.closeInputStream();
73        }
74    }
75}
76