/*
 * Copyright 2013 Takao Nakaguchi
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.trie4j.tail;

public class FastTailCharIterator{
	public FastTailCharIterator(CharSequence chars, int index){
		this.chars = chars;
		setIndex(index);
	}

	public void setIndex(int index){
		this.index = index;
	}

	public char getNext(){
		if(index == chars.length()) return '\0';
		char ret = chars.charAt(index);
		if(ret <= '\1'){
			if(ret == '\0'){
				return ret;
			} else{
				int i = chars.charAt(index + 1);
				i += chars.charAt(index + 2) << 16;
				index = i;
				ret = chars.charAt(index);
			}
		}
		index++;
		return ret;
	}
	private CharSequence chars;
	private int index;
}