001/*
002 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved.
003 *
004 * Project and contact information: http://www.cascading.org/
005 *
006 * This file is part of the Cascading project.
007 *
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package cascading.tap.hadoop.io;
022
023import java.io.IOException;
024
025import cascading.util.SingleValueCloseableIterator;
026import org.apache.hadoop.mapred.RecordReader;
027
028/**
029 * RecordReaderIterator is a utility class for handing off a single {@link RecordReader} instance
030 * via the {@link java.util.Iterator}.
031 * <p/>
032 * This class is frequently used with the {@link cascading.tuple.TupleEntrySchemeIterator} where there is only
033 * one RecordReader to iterate values over.
034 */
035public class RecordReaderIterator extends SingleValueCloseableIterator<RecordReader>
036  {
037  public RecordReaderIterator( RecordReader reader )
038    {
039    super( reader );
040    }
041
042  @Override
043  public void close() throws IOException
044    {
045    getCloseableInput().close();
046    }
047  }