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> lets a given <code>ClassVisitor</code>
27: * optionally travel to the visited class, its superclass, its interfaces, and
28: * its subclasses.
29: *
30: * @author Eric Lafortune
31: */
32: public class ClassHierarchyTraveler implements ClassVisitor {
33: private final boolean visitThisClass;
34: private final boolean visitSuperClass;
35: private final boolean visitInterfaces;
36: private final boolean visitSubclasses;
37:
38: private final ClassVisitor classVisitor;
39:
40: /**
41: * Creates a new ClassHierarchyTraveler.
42: * @param visitThisClass specifies whether to visit the originally visited
43: * classes.
44: * @param visitSuperClass specifies whether to visit the super classes of
45: * the visited classes.
46: * @param visitInterfaces specifies whether to visit the interfaces of
47: * the visited classes.
48: * @param visitSubclasses specifies whether to visit the subclasses of
49: * the visited classes.
50: * @param classVisitor the <code>ClassVisitor</code> to
51: * which visits will be delegated.
52: */
53: public ClassHierarchyTraveler(boolean visitThisClass,
54: boolean visitSuperClass, boolean visitInterfaces,
55: boolean visitSubclasses, ClassVisitor classVisitor) {
56: this .visitThisClass = visitThisClass;
57: this .visitSuperClass = visitSuperClass;
58: this .visitInterfaces = visitInterfaces;
59: this .visitSubclasses = visitSubclasses;
60:
61: this .classVisitor = classVisitor;
62: }
63:
64: // Implementations for ClassVisitor.
65:
66: public void visitProgramClass(ProgramClass programClass) {
67: programClass.hierarchyAccept(visitThisClass, visitSuperClass,
68: visitInterfaces, visitSubclasses, classVisitor);
69: }
70:
71: public void visitLibraryClass(LibraryClass libraryClass) {
72: libraryClass.hierarchyAccept(visitThisClass, visitSuperClass,
73: visitInterfaces, visitSubclasses, classVisitor);
74: }
75: }
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