InstanceofClassFilter.java revision db267bc191f906f55eaef21a27110cce2ec57fdf 
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.optimize.info;
22
23import proguard.classfile.*;
24import proguard.classfile.visitor.ClassVisitor;
25
26/**
27 * This ClassVisitor delegates all its method calls to another ClassVisitor,
28 * but only for Clazz objects that are used in an 'instanceof' test.
29 *
30 * @see InstanceofClassMarker
31 * @author Eric Lafortune
32 */
33public class InstanceofClassFilter
34implements   ClassVisitor
35{
36    private final ClassVisitor classVisitor;
37
38
39    public InstanceofClassFilter(ClassVisitor classVisitor)
40    {
41        this.classVisitor = classVisitor;
42    }
43
44
45    // Implementations for ClassVisitor.
46
47    public void visitProgramClass(ProgramClass programClass)
48    {
49        if (InstanceofClassMarker.isInstanceofed(programClass))
50        {
51            classVisitor.visitProgramClass(programClass);
52        }
53    }
54
55
56    public void visitLibraryClass(LibraryClass libraryClass)
57    {
58        if (InstanceofClassMarker.isInstanceofed(libraryClass))
59        {
60            classVisitor.visitLibraryClass(libraryClass);
61        }
62    }
63}