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Java > Open Source Codes > gnu > regexp > CharIndexedStringBuffer


1 /*
2  * gnu/regexp/CharIndexedStringBuffer.java
3  * Copyright (C) 1998-2001 Wes Biggs
4  *
5  * This library is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public License as published
7  * by the Free Software Foundation; either version 2.1 of the License, or
8  * (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19 package gnu.regexp;
20 import java.io.Serializable JavaDoc;
21
22 class CharIndexedStringBuffer implements CharIndexed, Serializable JavaDoc {
23     private StringBuffer JavaDoc s;
24     private int anchor;
25
26     CharIndexedStringBuffer(StringBuffer JavaDoc str, int index) {
27     s = str;
28     anchor = index;
29     }
30
31   public char charAt(int index) {
32       int pos = anchor + index;
33     return ((pos < s.length()) && (pos >= 0)) ? s.charAt(pos) : OUT_OF_BOUNDS;
34   }
35
36   public boolean isValid() {
37     return (anchor < s.length());
38   }
39
40   public boolean move(int index) {
41     return ((anchor += index) < s.length());
42   }
43 }
44
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