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Java > Open Source Codes > proguard > classfile > visitor > ClassVersionSetter


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 library 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 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 JavaDoc;
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 {
35     private int classVersion;
36
37     private Set JavaDoc 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 JavaDoc 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 JavaDoc(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
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