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 start with a given fixed string
25 * and then match another optional given StringMatcher.
26 *
27 * @author Eric Lafortune
28 */
29public class FixedStringMatcher implements StringMatcher
30{
31    private final String        fixedString;
32    private final StringMatcher nextMatcher;
33
34
35    public FixedStringMatcher(String fixedString)
36    {
37        this(fixedString, null);
38    }
39
40
41    public FixedStringMatcher(String fixedString, StringMatcher nextMatcher)
42    {
43        this.fixedString = fixedString;
44        this.nextMatcher = nextMatcher;
45    }
46
47
48    // Implementations for StringMatcher.
49
50    public boolean matches(String string)
51    {
52        return string.startsWith(fixedString) &&
53               (nextMatcher == null ||
54                nextMatcher.matches(string.substring(fixedString.length())));
55    }
56}
57