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  */
21 package 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  */
29 public class FixedStringMatcher implements StringMatcher
30 {
31     private final String        fixedString;
32     private final StringMatcher nextMatcher;
33 
34 
FixedStringMatcher(String fixedString)35     public FixedStringMatcher(String fixedString)
36     {
37         this(fixedString, null);
38     }
39 
40 
FixedStringMatcher(String fixedString, StringMatcher nextMatcher)41     public FixedStringMatcher(String fixedString, StringMatcher nextMatcher)
42     {
43         this.fixedString = fixedString;
44         this.nextMatcher = nextMatcher;
45     }
46 
47 
48     // Implementations for StringMatcher.
49 
matches(String string)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