1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2014 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 are in a given list.
28 *
29 * @author Eric Lafortune
30 */
31public class ExceptClassesFilter implements ClassVisitor
32{
33    private final Clazz[]      exceptClasses;
34    private final ClassVisitor classVisitor;
35
36
37    /**
38     * Creates a new ExceptClassesFilter.
39     * @param exceptClasses the classes that will not be visited.
40     * @param classVisitor  the <code>ClassVisitor</code> to which visits will
41     *                      be delegated.
42     */
43    public ExceptClassesFilter(Clazz[]      exceptClasses,
44                               ClassVisitor classVisitor)
45    {
46        this.exceptClasses = exceptClasses;
47        this.classVisitor  = classVisitor;
48    }
49
50
51    // Implementations for ClassVisitor.
52
53    public void visitProgramClass(ProgramClass programClass)
54    {
55        if (!present(programClass))
56        {
57            classVisitor.visitProgramClass(programClass);
58        }
59    }
60
61
62    public void visitLibraryClass(LibraryClass libraryClass)
63    {
64        if (!present(libraryClass))
65        {
66            classVisitor.visitLibraryClass(libraryClass);
67        }
68    }
69
70
71    // Small utility methods.
72
73    private boolean present(Clazz clazz)
74    {
75        if (exceptClasses == null)
76        {
77            return false;
78        }
79
80        for (int index = 0; index < exceptClasses.length; index++)
81        {
82            if (exceptClasses[index].equals(clazz))
83            {
84                return true;
85            }
86        }
87
88        return false;
89    }
90}