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Java > Open Source Codes > proguard > optimize > WriteOnlyFieldFilter


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.optimize;
22
23 import proguard.classfile.*;
24 import proguard.classfile.util.SimplifiedVisitor;
25 import proguard.classfile.visitor.MemberVisitor;
26 import proguard.optimize.info.ReadWriteFieldMarker;
27
28 /**
29  * This <code>MemberVisitor</code> delegates its visits to program fields to
30  * other given <code>MemberVisitor</code> instances, but only when the visited
31  * field has been marked as write-only.
32  *
33  * @see ReadWriteFieldMarker
34  * @author Eric Lafortune
35  */
36 public class WriteOnlyFieldFilter
37 extends SimplifiedVisitor
38 implements MemberVisitor
39 {
40     private MemberVisitor writeOnlyFieldVisitor;
41
42
43     /**
44      * Creates a new WriteOnlyFieldFilter.
45      * @param writeOnlyFieldVisitor the <code>MemberVisitor</code> to which
46      * visits to write-only fields will be delegated.
47      */
48     public WriteOnlyFieldFilter(MemberVisitor writeOnlyFieldVisitor)
49     {
50         this.writeOnlyFieldVisitor = writeOnlyFieldVisitor;
51     }
52
53
54     // Implementations for MemberVisitor.
55
56     public void visitProgramField(ProgramClass programClass, ProgramField programField)
57     {
58
59         if (ReadWriteFieldMarker.isWritten(programField) &&
60             !ReadWriteFieldMarker.isRead(programField))
61         {
62             writeOnlyFieldVisitor.visitProgramField(programClass, programField);
63         }
64     }
65 }
66
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