001    /*
002     * Copyright (c) 2007-2014 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    
021    package cascading.tap.hadoop.io;
022    
023    import java.io.IOException;
024    
025    import cascading.util.SingleValueCloseableIterator;
026    import 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     */
035    public 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      }