/* *  gnu/regexp/CharIndexedStringBuffer.java *  Copyright (C) 1998-2001 Wes Biggs * *  This library is free software; you can redistribute it and/or modify *  it under the terms of the GNU Lesser General Public License as published *  by the Free Software Foundation; either version 2.1 of the License, or *  (at your option) any later version. * *  This library is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU Lesser General Public License for more details. * *  You should have received a copy of the GNU Lesser General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */package gnu.regexp;import java.io.Serializable;class CharIndexedStringBuffer implements CharIndexed, Serializable {    private StringBuffer s;    private int anchor;    CharIndexedStringBuffer(StringBuffer str, int index) {	s = str;	anchor = index;    }  public char charAt(int index) {      int pos = anchor + index;    return ((pos < s.length()) && (pos >= 0)) ? s.charAt(pos) : OUT_OF_BOUNDS;  }  public boolean isValid() {    return (anchor < s.length());  }  public boolean move(int index) {    return ((anchor += index) < s.length());  }}