1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2014 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.classfile.visitor;
22
23import proguard.classfile.*;
24
25import 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 */
33public class ClassVersionSetter implements ClassVisitor
34{
35    private final int classVersion;
36
37    private final Set newerClassVersions;
38
39
40    /**
41     * Creates a new ClassVersionSetter.
42     * @param classVersion the class version number.
43     */
44    public ClassVersionSetter(int classVersion)
45    {
46        this(classVersion, null);
47    }
48
49
50    /**
51     * Creates a new ClassVersionSetter that also stores any newer class version
52     * numbers that it encounters while visiting program classes.
53     * @param classVersion       the class version number.
54     * @param newerClassVersions the <code>Set</code> in which newer class
55     *                           version numbers can be collected.
56     */
57    public ClassVersionSetter(int classVersion,
58                              Set newerClassVersions)
59    {
60        this.classVersion       = classVersion;
61        this.newerClassVersions = newerClassVersions;
62    }
63
64
65    // Implementations for ClassVisitor.
66
67    public void visitProgramClass(ProgramClass programClass)
68    {
69        if (programClass.u4version > classVersion &&
70            newerClassVersions != null)
71        {
72            newerClassVersions.add(new Integer(programClass.u4version));
73        }
74
75        programClass.u4version = classVersion;
76    }
77
78
79    public void visitLibraryClass(LibraryClass libraryClass)
80    {
81        // Library classes don't have version numbers.
82    }
83}
84