--- /dev/null
+/*
+ * gnu/regexp/CharIndexedString.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 CharIndexedString implements CharIndexed, Serializable {
+ private String s;
+ private int anchor;
+ private int len;
+
+ CharIndexedString(String str, int index) {
+ s = str;
+ len = s.length();
+ anchor = index;
+ }
+
+ public char charAt(int index) {
+ int pos = anchor + index;
+ return ((pos < len) && (pos >= 0)) ? s.charAt(pos) : OUT_OF_BOUNDS;
+ }
+
+ public boolean isValid() {
+ return (anchor < len);
+ }
+
+ public boolean move(int index) {
+ return ((anchor += index) < len);
+ }
+}