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Java > Open Source Codes > proguard > util > ExtensionMatcher


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 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  */
21 package 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  */
29 public class ExtensionMatcher implements StringMatcher
30 {
31     private String JavaDoc 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 JavaDoc extension)
39     {
40         this.extension = extension;
41     }
42
43
44     // Implementations for StringMatcher.
45
46     public boolean matches(String JavaDoc 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 JavaDoc string, String JavaDoc 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
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