01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This program is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * 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 proguard.classfile.*;
24: import proguard.classfile.io.ProgramClassWriter;
25:
26: import java.io.*;
27:
28: /**
29: * This DataEntryReader reads class entries and writes their corresponding
30: * versions from the ClassPool to a given DataEntryWriter.
31: *
32: * @author Eric Lafortune
33: */
34: public class ClassRewriter implements DataEntryReader {
35: private final ClassPool classPool;
36: private final DataEntryWriter dataEntryWriter;
37:
38: public ClassRewriter(ClassPool classPool,
39: DataEntryWriter dataEntryWriter) {
40: this .classPool = classPool;
41: this .dataEntryWriter = dataEntryWriter;
42: }
43:
44: // Implementations for DataEntryReader.
45:
46: public void read(DataEntry dataEntry) throws IOException {
47: String inputName = dataEntry.getName();
48: String className = inputName.substring(0, inputName.length()
49: - ClassConstants.CLASS_FILE_EXTENSION.length());
50:
51: // Find the modified class corrsponding to the input entry.
52: ProgramClass programClass = (ProgramClass) classPool
53: .getClass(className);
54: if (programClass != null) {
55: // Rename the data entry if necessary.
56: String newClassName = programClass.getName();
57: if (!className.equals(newClassName)) {
58: dataEntry = new RenamedDataEntry(dataEntry,
59: newClassName
60: + ClassConstants.CLASS_FILE_EXTENSION);
61: }
62:
63: // Get the output entry corresponding to this input entry.
64: OutputStream outputStream = dataEntryWriter
65: .getOutputStream(dataEntry);
66: if (outputStream != null) {
67: // Write the class to the output entry.
68: DataOutputStream classOutputStream = new DataOutputStream(
69: outputStream);
70:
71: new ProgramClassWriter(classOutputStream)
72: .visitProgramClass(programClass);
73:
74: classOutputStream.flush();
75: }
76: }
77: }
78: }
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