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


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
25
26 /**
27  * This <code>ClassVisitor</code> delegates its visits to another given
28  * <code>ClassVisitor</code>, but only when visiting classes that don't
29  * have any subclasses.
30  *
31  * @author Eric Lafortune
32  */
33 public class BottomClassFilter implements ClassVisitor
34 {
35     private ClassVisitor classVisitor;
36
37
38     /**
39      * Creates a new ProgramClassFilter.
40      * @param classVisitor the <code>ClassVisitor</code> to which visits
41      * will be delegated.
42      */
43     public BottomClassFilter(ClassVisitor classVisitor)
44     {
45         this.classVisitor = classVisitor;
46     }
47
48
49     // Implementations for ClassVisitor.
50
51     public void visitProgramClass(ProgramClass programClass)
52     {
53         // Is this a bottom class in the class hierarchy?
54 if (programClass.subClasses == null)
55         {
56             classVisitor.visitProgramClass(programClass);
57         }
58     }
59
60
61     public void visitLibraryClass(LibraryClass libraryClass)
62     {
63         // Is this a bottom class in the class hierarchy?
64 if (libraryClass.subClasses == null)
65         {
66             classVisitor.visitLibraryClass(libraryClass);
67         }
68     }
69 }
70
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