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/jEdit/tags/jedit-4-2-pre4/gnu/regexp/CharIndexedStringBuffer.java

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Java | 43 lines | 20 code | 5 blank | 18 comment | 1 complexity | 15d52a6b44063b997b602896440aa751 MD5 | raw file
 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}