ImplementedClassFilter.java revision 9f606f95f03a75961498803e24bee6799a7c0885 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2009 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 */
21package proguard.classfile.visitor;
22
23import proguard.classfile.*;
24
25/**
26 * This <code>ClassVisitor</code> delegates its visits to another given
27 * <code>ClassVisitor</code>, except for classes that extend or implement
28 * a given class.
29 *
30 * @author Eric Lafortune
31 */
32public class ImplementedClassFilter implements ClassVisitor
33{
34    private final Clazz        implementedClass;
35    private final ClassVisitor classVisitor;
36
37
38    /**
39     * Creates a new ImplementedClassFilter.
40     * @param implementedClass the class whose implementations will not be
41     *                         visited.
42     * @param classVisitor     the <code>ClassVisitor</code> to which visits will
43     *                         be delegated.
44     */
45    public ImplementedClassFilter(Clazz        implementedClass,
46                                  ClassVisitor classVisitor)
47    {
48        this.implementedClass = implementedClass;
49        this.classVisitor     = classVisitor;
50    }
51
52
53    // Implementations for ClassVisitor.
54
55    public void visitProgramClass(ProgramClass programClass)
56    {
57        if (!programClass.extendsOrImplements(implementedClass))
58        {
59            classVisitor.visitProgramClass(programClass);
60        }
61    }
62
63
64    public void visitLibraryClass(LibraryClass libraryClass)
65    {
66        if (!libraryClass.extendsOrImplements(implementedClass))
67        {
68            classVisitor.visitLibraryClass(libraryClass);
69        }
70    }
71}