1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 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 proguard.classfile.*;
24import proguard.classfile.io.ProgramClassWriter;
25
26import java.io.*;
27
28
29/**
30 * This DataEntryReader reads class entries and writes their corresponding
31 * versions from the ClassPool to a given DataEntryWriter.
32 *
33 * @author Eric Lafortune
34 */
35public class ClassRewriter implements DataEntryReader
36{
37    private final ClassPool       classPool;
38    private final DataEntryWriter dataEntryWriter;
39
40
41    public ClassRewriter(ClassPool       classPool,
42                         DataEntryWriter dataEntryWriter)
43    {
44        this.classPool       = classPool;
45        this.dataEntryWriter = dataEntryWriter;
46    }
47
48
49    // Implementations for DataEntryReader.
50
51    public void read(DataEntry dataEntry) throws IOException
52    {
53        String inputName = dataEntry.getName();
54        String className = inputName.substring(0, inputName.length() - ClassConstants.CLASS_FILE_EXTENSION.length());
55
56        // Find the modified class corrsponding to the input entry.
57        ProgramClass programClass = (ProgramClass)classPool.getClass(className);
58        if (programClass != null)
59        {
60            // Rename the data entry if necessary.
61            String newClassName = programClass.getName();
62            if (!className.equals(newClassName))
63            {
64                dataEntry = new RenamedDataEntry(dataEntry, newClassName + ClassConstants.CLASS_FILE_EXTENSION);
65            }
66
67            // Get the output entry corresponding to this input entry.
68            OutputStream outputStream = dataEntryWriter.getOutputStream(dataEntry);
69            if (outputStream != null)
70            {
71                // Write the class to the output entry.
72                DataOutputStream classOutputStream = new DataOutputStream(outputStream);
73
74                new ProgramClassWriter(classOutputStream).visitProgramClass(programClass);
75
76                classOutputStream.flush();
77            }
78        }
79    }
80}
81