01: /*
02: * gnu/regexp/CharIndexedStringBuffer.java
03: * Copyright (C) 1998-2001 Wes Biggs
04: *
05: * This library is free software; you can redistribute it and/or modify
06: * it under the terms of the GNU Lesser General Public License as published
07: * by the Free Software Foundation; either version 2.1 of the License, or
08: * (at your option) any later version.
09: *
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:
21: import java.io.Serializable;
22:
23: class CharIndexedStringBuffer implements CharIndexed, Serializable {
24: private StringBuffer s;
25: private int anchor;
26:
27: CharIndexedStringBuffer(StringBuffer str, int index) {
28: s = str;
29: anchor = index;
30: }
31:
32: public char charAt(int index) {
33: int pos = anchor + index;
34: return ((pos < s.length()) && (pos >= 0)) ? s.charAt(pos)
35: : OUT_OF_BOUNDS;
36: }
37:
38: public boolean isValid() {
39: return (anchor < s.length());
40: }
41:
42: public boolean move(int index) {
43: return ((anchor += index) < s.length());
44: }
45: }
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