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.*;
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 ListParser(new NameParser()).parse(regularExpression),
51             memberVisitor);
52    }
53
54
55    /**
56     * Creates a new MemberNameFilter.
57     * @param regularExpressionMatcher the regular expression against which
58     *                                 member names will be matched.
59     * @param memberVisitor            the <code>MemberVisitor</code> to which
60     *                                 visits will be delegated.
61     */
62    public MemberNameFilter(StringMatcher regularExpressionMatcher,
63                            MemberVisitor memberVisitor)
64    {
65        this.regularExpressionMatcher = regularExpressionMatcher;
66        this.memberVisitor            = memberVisitor;
67    }
68
69
70    // Implementations for MemberVisitor.
71
72    public void visitProgramField(ProgramClass programClass, ProgramField programField)
73    {
74        if (accepted(programField.getName(programClass)))
75        {
76            memberVisitor.visitProgramField(programClass, programField);
77        }
78    }
79
80
81    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
82    {
83        if (accepted(programMethod.getName(programClass)))
84        {
85            memberVisitor.visitProgramMethod(programClass, programMethod);
86        }
87    }
88
89
90    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
91    {
92        if (accepted(libraryField.getName(libraryClass)))
93        {
94            memberVisitor.visitLibraryField(libraryClass, libraryField);
95        }
96    }
97
98
99    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
100    {
101        if (accepted(libraryMethod.getName(libraryClass)))
102        {
103            memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
104        }
105    }
106
107
108    // Small utility methods.
109
110    private boolean accepted(String name)
111    {
112        return regularExpressionMatcher.matches(name);
113    }
114}
115