/jEdit/tags/jedit-4-2-pre14/gnu/regexp/CharIndexedStringBuffer.java
Java | 43 lines | 20 code | 5 blank | 18 comment | 1 complexity | 15d52a6b44063b997b602896440aa751 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
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 */
19package gnu.regexp;
20import java.io.Serializable;
21
22class CharIndexedStringBuffer implements CharIndexed, Serializable {
23 private StringBuffer s;
24 private int anchor;
25
26 CharIndexedStringBuffer(StringBuffer 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}