001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.mapred.join;
019
020import java.util.ArrayList;
021
022import org.apache.hadoop.classification.InterfaceAudience;
023import org.apache.hadoop.classification.InterfaceStability;
024import org.apache.hadoop.io.Writable;
025
026/**
027 * This class provides an implementation of ResetableIterator. The
028 * implementation uses an {@link java.util.ArrayList} to store elements
029 * added to it, replaying them as requested.
030 * Prefer {@link StreamBackedIterator}.
031 */
032@InterfaceAudience.Public
033@InterfaceStability.Stable
034public class ArrayListBackedIterator<X extends Writable> extends 
035    org.apache.hadoop.mapreduce.lib.join.ArrayListBackedIterator<X>
036    implements ResetableIterator<X> {
037
038  public ArrayListBackedIterator() {
039    super();
040  }
041
042  public ArrayListBackedIterator(ArrayList<X> data) {
043    super(data);
044  }
045}