MemberSpecialNameFilter.java revision 2270795fbe0b277bfd49f40950ecaa78583175cc 
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.obfuscate;
22
23import proguard.classfile.*;
24import proguard.classfile.visitor.MemberVisitor;
25
26/**
27 * This <code>MemberVisitor</code> delegates its visits to another given
28 * <code>MemberVisitor</code>, but only when the visited member has a
29 * special new name. A special name is a name that might have been produced by
30 * a <code>SpecialNameFactory</code>.
31 *
32 * @see MemberObfuscator
33 * @see SpecialNameFactory
34 *
35 * @author Eric Lafortune
36 */
37public class MemberSpecialNameFilter implements MemberVisitor
38{
39    private final MemberVisitor memberVisitor;
40
41
42    /**
43     * Creates a new MemberSpecialNameFilter.
44     * @param memberVisitor the <code>MemberVisitor</code> to which
45     *                      visits will be delegated.
46     */
47    public MemberSpecialNameFilter(MemberVisitor memberVisitor)
48    {
49        this.memberVisitor = memberVisitor;
50    }
51
52
53    // Implementations for MemberVisitor.
54
55    public void visitProgramField(ProgramClass programClass, ProgramField programField)
56    {
57        if (hasSpecialName(programField))
58        {
59            memberVisitor.visitProgramField(programClass, programField);
60        }
61    }
62
63
64    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
65    {
66        if (hasSpecialName(programMethod))
67        {
68            memberVisitor.visitProgramMethod(programClass, programMethod);
69        }
70    }
71
72
73    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
74    {
75        if (hasSpecialName(libraryField))
76        {
77            memberVisitor.visitLibraryField(libraryClass, libraryField);
78        }
79    }
80
81
82    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
83    {
84        if (hasSpecialName(libraryMethod))
85        {
86            memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
87        }
88    }
89
90
91    // Small utility methods.
92
93    /**
94     * Returns whether the given class member has a special new name.
95     * @param member the class member.
96     */
97    private static boolean hasSpecialName(Member member)
98    {
99        return SpecialNameFactory.isSpecialName(MemberObfuscator.newMemberName(member));
100    }
101}
102