KeptMemberFilter.java revision b9cc48a43ed984587c939d02fba5316bf5c0df6e 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 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;
22
23import proguard.classfile.*;
24import proguard.classfile.visitor.MemberVisitor;
25
26/**
27 * This MemberVisitor delegates all its method calls to another MemberVisitor,
28 * but only for Member objects that are marked as kept.
29 *
30 * @see KeepMarker
31 *
32 * @author Eric Lafortune
33 */
34public class KeptMemberFilter
35implements   MemberVisitor
36{
37    private final MemberVisitor memberVisitor;
38
39
40    /**
41     * Creates a new KeptMemberFilter.
42     * @param memberVisitor the member visitor to which the visiting will be
43     *                      delegated.
44     */
45    public KeptMemberFilter(MemberVisitor memberVisitor)
46    {
47        this.memberVisitor = memberVisitor;
48    }
49
50
51    // Implementations for MemberVisitor.
52
53    public void visitProgramField(ProgramClass programClass, ProgramField programField)
54    {
55        if (KeepMarker.isKept(programField))
56        {
57            memberVisitor.visitProgramField(programClass, programField);
58        }
59    }
60
61
62    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
63    {
64        if (KeepMarker.isKept(programMethod))
65        {
66            memberVisitor.visitProgramMethod(programClass, programMethod);
67        }
68    }
69
70
71    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
72    {
73        if (KeepMarker.isKept(libraryField))
74        {
75            memberVisitor.visitLibraryField(libraryClass, libraryField);
76        }
77    }
78
79
80    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
81    {
82        if (KeepMarker.isKept(libraryMethod))
83        {
84            memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
85        }
86    }
87}