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Java > Open Source Codes > proguard > shrink > UsedMemberFilter


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.shrink;
22
23 import proguard.classfile.visitor.*;
24 import proguard.classfile.*;
25
26 /**
27  * This MemberVisitor delegates all its method calls to another MemberVisitor,
28  * but only for Member objects that are marked as used.
29  *
30  * @see UsageMarker
31  *
32  * @author Eric Lafortune
33  */
34 public class UsedMemberFilter
35 implements MemberVisitor
36 {
37     private UsageMarker usageMarker;
38     private MemberVisitor memberVisitor;
39
40
41     /**
42      * Creates a new UsedClassFilter.
43      * @param usageMarker the usage marker that is used to mark the classes
44      * and class members.
45      * @param memberVisitor the member visitor to which the visiting will be
46      * delegated.
47      */
48     public UsedMemberFilter(UsageMarker usageMarker,
49                             MemberVisitor memberVisitor)
50     {
51         this.usageMarker = usageMarker;
52         this.memberVisitor = memberVisitor;
53     }
54
55
56     // Implementations for MemberVisitor.
57
58
59     public void visitProgramField(ProgramClass programClass, ProgramField programField)
60     {
61         if (usageMarker.isUsed(programField))
62         {
63             memberVisitor.visitProgramField(programClass, programField);
64         }
65     }
66
67
68     public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
69     {
70         if (usageMarker.isUsed(programMethod))
71         {
72             memberVisitor.visitProgramMethod(programClass, programMethod);
73         }
74     }
75
76
77     public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
78     {
79         if (usageMarker.isUsed(libraryField))
80         {
81             memberVisitor.visitLibraryField(libraryClass, libraryField);
82         }
83     }
84
85
86     public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
87     {
88         if (usageMarker.isUsed(libraryMethod))
89         {
90             memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
91         }
92     }
93 }
94
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