MemberNameFilter.java revision b72c5c2e5482cf10117b2b25f642f7616b2326c3 
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.classfile.visitor;
22
23import proguard.classfile.*;
24import proguard.util.*;
25
26
27/**
28 * This <code>MemberVisitor</code> delegates its visits to another given
29 * <code>MemberVisitor</code>, but only when the visited member
30 * has a name that matches a given regular expression.
31 *
32 * @author Eric Lafortune
33 */
34public class MemberNameFilter implements MemberVisitor
35{
36    private final StringMatcher regularExpressionMatcher;
37    private final MemberVisitor memberVisitor;
38
39
40    /**
41     * Creates a new MemberNameFilter.
42     * @param regularExpression the regular expression against which member
43     *                          names will be matched.
44     * @param memberVisitor     the <code>MemberVisitor</code> to which visits
45     *                          will be delegated.
46     */
47    public MemberNameFilter(String        regularExpression,
48                            MemberVisitor memberVisitor)
49    {
50        this(new NameParser().parse(regularExpression), memberVisitor);
51    }
52
53
54    /**
55     * Creates a new MemberNameFilter.
56     * @param regularExpressionMatcher the regular expression against which
57     *                                 member names will be matched.
58     * @param memberVisitor            the <code>MemberVisitor</code> to which
59     *                                 visits will be delegated.
60     */
61    public MemberNameFilter(StringMatcher regularExpressionMatcher,
62                            MemberVisitor memberVisitor)
63    {
64        this.regularExpressionMatcher = regularExpressionMatcher;
65        this.memberVisitor            = memberVisitor;
66    }
67
68
69    // Implementations for MemberVisitor.
70
71    public void visitProgramField(ProgramClass programClass, ProgramField programField)
72    {
73        if (accepted(programField.getName(programClass)))
74        {
75            memberVisitor.visitProgramField(programClass, programField);
76        }
77    }
78
79
80    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
81    {
82        if (accepted(programMethod.getName(programClass)))
83        {
84            memberVisitor.visitProgramMethod(programClass, programMethod);
85        }
86    }
87
88
89    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
90    {
91        if (accepted(libraryField.getName(libraryClass)))
92        {
93            memberVisitor.visitLibraryField(libraryClass, libraryField);
94        }
95    }
96
97
98    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
99    {
100        if (accepted(libraryMethod.getName(libraryClass)))
101        {
102            memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
103        }
104    }
105
106
107    // Small utility methods.
108
109    private boolean accepted(String name)
110    {
111        return regularExpressionMatcher.matches(name);
112    }
113}
114