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.util;
22
23/**
24 * This StringMatcher tests whether strings end in a given extension, ignoring
25 * its case.
26 *
27 * @author Eric Lafortune
28 */
29public class ExtensionMatcher implements StringMatcher
30{
31    private final String extension;
32
33
34    /**
35     * Creates a new StringMatcher.
36     * @param extension the extension against which strings will be matched.
37     */
38    public ExtensionMatcher(String extension)
39    {
40        this.extension = extension;
41    }
42
43
44    // Implementations for StringMatcher.
45
46    public boolean matches(String string)
47    {
48        return endsWithIgnoreCase(string, extension);
49    }
50
51
52    /**
53     * Returns whether the given string ends with the given suffix, ignoring its
54     * case.
55     */
56    private static boolean endsWithIgnoreCase(String string, String suffix)
57    {
58        int stringLength = string.length();
59        int suffixLength = suffix.length();
60
61        return string.regionMatches(true, stringLength - suffixLength, suffix, 0, suffixLength);
62    }
63}
64