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


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.classfile.visitor;
22
23 import proguard.classfile.*;
24 import proguard.classfile.util.SimplifiedVisitor;
25
26 /**
27  * This <code>MemberVisitor</code> delegates its visits to methods to
28  * another given <code>MemberVisitor</code>, but only when the visited
29  * method may have implementations.
30  *
31  * @see Clazz#mayHaveImplementations(Method)
32  * @author Eric Lafortune
33  */

34 public class MethodImplementationFilter
35 extends SimplifiedVisitor
36 implements MemberVisitor
37 {
38     private MemberVisitor memberVisitor;
39
40
41     /**
42      * Creates a new MethodImplementationFilter.
43      * @param memberVisitor the <code>MemberVisitor</code> to which
44      * visits will be delegated.
45      */

46     public MethodImplementationFilter(MemberVisitor memberVisitor)
47     {
48         this.memberVisitor = memberVisitor;
49     }
50
51
52     // Implementations for MemberVisitor.
53

54     public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
55     {
56         if (programClass.mayHaveImplementations(programMethod))
57         {
58             memberVisitor.visitProgramMethod(programClass, programMethod);
59         }
60     }
61
62
63     public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
64     {
65         if (libraryClass.mayHaveImplementations(libraryMethod))
66         {
67             memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
68         }
69     }
70 }
71
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