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;
22
23import proguard.classfile.*;
24import proguard.classfile.visitor.MemberVisitor;
25import proguard.optimize.info.*;
26
27/**
28 * This <code>MemberVisitor</code> delegates its visits to another given
29 * <code>MemberVisitor</code>, but only when the visited member has optimization
30 * info.
31 *
32 * @see FieldOptimizationInfo
33 * @see MethodOptimizationInfo
34 * @author Eric Lafortune
35 */
36public class OptimizationInfoMemberFilter
37implements   MemberVisitor
38{
39    private final MemberVisitor memberVisitor;
40
41
42    /**
43     * Creates a new OptimizationInfoMemberFilter.
44     * @param memberVisitor the <code>MemberVisitor</code> to which visits will
45     *                      be delegated.
46     */
47    public OptimizationInfoMemberFilter(MemberVisitor memberVisitor)
48    {
49        this.memberVisitor = memberVisitor;
50    }
51
52
53    // Implementations for MemberVisitor.
54
55
56    public void visitProgramField(ProgramClass programClass, ProgramField programField)
57    {
58        // Does the field have optimization info?
59        if (FieldOptimizationInfo.getFieldOptimizationInfo(programField) != null)
60        {
61            memberVisitor.visitProgramField(programClass, programField);
62        }
63    }
64
65
66    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
67    {
68        // Does the field have optimization info?
69        if (FieldOptimizationInfo.getFieldOptimizationInfo(libraryField) != null)
70        {
71            memberVisitor.visitLibraryField(libraryClass, libraryField);
72        }
73    }
74
75
76    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
77    {
78        // Does the method have optimization info?
79        if (MethodOptimizationInfo.getMethodOptimizationInfo(programMethod) != null)
80        {
81            memberVisitor.visitProgramMethod(programClass, programMethod);
82        }
83    }
84
85
86    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
87    {
88        // Does the method have optimization info?
89        if (MethodOptimizationInfo.getMethodOptimizationInfo(libraryMethod) != null)
90        {
91            memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
92        }
93    }
94}
95