/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.hadoop.contrib.utils.join;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;

/**
 * This class provides an implementation of ResetableIterator. The
 * implementation will be based on ArrayList.
 * 
 * @author runping
 * 
 */
public class ArrayListBackedIterator implements ResetableIterator {

  private Iterator iter;

  private ArrayList<Object> data;

  public ArrayListBackedIterator() {
    this(new ArrayList<Object>());
  }

  public ArrayListBackedIterator(ArrayList<Object> data) {
    this.data = data;
    this.iter = this.data.iterator();
  }

  public void add(Object item) {
    this.data.add(item);
  }

  public boolean hasNext() {
    return this.iter.hasNext();
  }

  public Object next() {
    return this.iter.next();
  }

  public void remove() {

  }

  public void reset() {
    this.iter = this.data.iterator();
  }

  public void close() throws IOException {
    this.iter = null;
    this.data = null;
  }
}
