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Java > Open Source Codes > proguard > obfuscate > MemberSpecialNameFilter


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 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  */
21 package proguard.obfuscate;
22
23 import proguard.classfile.*;
24 import proguard.classfile.visitor.MemberVisitor;
25
26 import java.util.*;
27
28 /**
29  * This <code>MemberVisitor</code> delegates its visits to another given
30  * <code>MemberVisitor</code>, but only when the visited member has a
31  * special new name. A special name is a name that might have been produced by
32  * a <code>SpecialNameFactory</code>.
33  *
34  * @see MemberObfuscator
35  * @see SpecialNameFactory
36  *
37  * @author Eric Lafortune
38  */
39 public class MemberSpecialNameFilter implements MemberVisitor
40 {
41     private MemberVisitor memberVisitor;
42
43
44     /**
45      * Creates a new MemberSpecialNameFilter.
46      * @param memberVisitor the <code>MemberVisitor</code> to which
47      * visits will be delegated.
48      */
49     public MemberSpecialNameFilter(MemberVisitor memberVisitor)
50     {
51         this.memberVisitor = memberVisitor;
52     }
53
54
55     // Implementations for MemberVisitor.
56
57     public void visitProgramField(ProgramClass programClass, ProgramField programField)
58     {
59         if (isSpecialName(programField))
60         {
61             memberVisitor.visitProgramField(programClass, programField);
62         }
63     }
64
65
66     public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
67     {
68         if (isSpecialName(programMethod))
69         {
70             memberVisitor.visitProgramMethod(programClass, programMethod);
71         }
72     }
73
74
75     public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
76     {
77         if (isSpecialName(libraryField))
78         {
79             memberVisitor.visitLibraryField(libraryClass, libraryField);
80         }
81     }
82
83
84     public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
85     {
86         if (isSpecialName(libraryMethod))
87         {
88             memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
89         }
90     }
91
92
93     // Small utility methods.
94
95     /**
96      * Returns whether the given class member has a special new name.
97      * @param member the class member.
98      */
99     private static boolean isSpecialName(Member member)
100     {
101         return SpecialNameFactory.isSpecialName(MemberObfuscator.newMemberName(member));
102     }
103 }
104
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