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 library 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 library 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 Lesser General Public License
15: * for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public License
18: * along with this library; if not, write to the Free Software Foundation,
19: * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: */
21: package proguard.classfile.visitor;
22:
23: import proguard.classfile.*;
24:
25: import java.util.Set;
26:
27: /**
28: * This <code>ClassVisitor</code> sets the version number of the program classes
29: * that it visits.
30: *
31: * @author Eric Lafortune
32: */
33: public class ClassVersionSetter implements ClassVisitor {
34: private final int classVersion;
35:
36: private final Set newerClassVersions;
37:
38: /**
39: * Creates a new ClassVersionSetter.
40: * @param classVersion the class version number.
41: */
42: public ClassVersionSetter(int classVersion) {
43: this (classVersion, null);
44: }
45:
46: /**
47: * Creates a new ClassVersionSetter that also stores any newer class version
48: * numbers that it encounters while visiting program classes.
49: * @param classVersion the class version number.
50: * @param newerClassVersions the <code>Set</code> in which newer class
51: * version numbers can be collected.
52: */
53: public ClassVersionSetter(int classVersion, Set newerClassVersions) {
54: this .classVersion = classVersion;
55: this .newerClassVersions = newerClassVersions;
56: }
57:
58: // Implementations for ClassVisitor.
59:
60: public void visitProgramClass(ProgramClass programClass) {
61: if (programClass.u4version > classVersion
62: && newerClassVersions != null) {
63: newerClassVersions.add(new Integer(programClass.u4version));
64: }
65:
66: programClass.u4version = classVersion;
67: }
68:
69: public void visitLibraryClass(LibraryClass libraryClass) {
70: // Library classes don't have version numbers.
71: }
72: }
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