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Java > Open Source Codes > proguard > io > JarReader


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 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  */
21 package proguard.io;
22
23 import java.io.*;
24 import 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  */
32 public class JarReader implements DataEntryReader
33 {
34     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                 if (!zipEntry.isDirectory())
65                 {
66                     // Delegate the actual reading to the data entry reader.
67 dataEntryReader.read(new ZipDataEntry(dataEntry,
68                                                           zipEntry,
69                                                           zipInputStream));
70                 }
71             }
72         }
73         finally
74         {
75             dataEntry.closeInputStream();
76         }
77     }
78 }
79
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