| /** |
| * 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. |
| * |
| * |
| */ |
| 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; |
| } |
| } |