01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This program is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * 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: * This <code>ClassVisitor</code> delegates its visits to another given
27: * <code>ClassVisitor</code>, but only when visiting classes that don't
28: * have any subclasses.
29: *
30: * @author Eric Lafortune
31: */
32: public class BottomClassFilter implements ClassVisitor {
33: private final ClassVisitor classVisitor;
34:
35: /**
36: * Creates a new ProgramClassFilter.
37: * @param classVisitor the <code>ClassVisitor</code> to which visits
38: * will be delegated.
39: */
40: public BottomClassFilter(ClassVisitor classVisitor) {
41: this .classVisitor = classVisitor;
42: }
43:
44: // Implementations for ClassVisitor.
45:
46: public void visitProgramClass(ProgramClass programClass) {
47: // Is this a bottom class in the class hierarchy?
48: if (programClass.subClasses == null) {
49: classVisitor.visitProgramClass(programClass);
50: }
51: }
52:
53: public void visitLibraryClass(LibraryClass libraryClass) {
54: // Is this a bottom class in the class hierarchy?
55: if (libraryClass.subClasses == null) {
56: classVisitor.visitLibraryClass(libraryClass);
57: }
58: }
59: }
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