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     */
018    
019    package org.apache.hadoop.mapreduce.lib.input;
020    
021    import java.io.IOException;
022    
023    import org.apache.hadoop.classification.InterfaceAudience;
024    import org.apache.hadoop.classification.InterfaceStability;
025    import org.apache.hadoop.io.LongWritable;
026    import org.apache.hadoop.io.Text;
027    import org.apache.hadoop.mapreduce.InputSplit;
028    import org.apache.hadoop.mapreduce.RecordReader;
029    import org.apache.hadoop.mapreduce.TaskAttemptContext;
030    
031    /**
032     * Input format that is a <code>CombineFileInputFormat</code>-equivalent for
033     * <code>TextInputFormat</code>.
034     *
035     * @see CombineFileInputFormat
036     */
037    @InterfaceAudience.Public
038    @InterfaceStability.Stable
039    public class CombineTextInputFormat
040      extends CombineFileInputFormat<LongWritable,Text> {
041      public RecordReader<LongWritable,Text> createRecordReader(InputSplit split,
042        TaskAttemptContext context) throws IOException {
043        return new CombineFileRecordReader<LongWritable,Text>(
044          (CombineFileSplit)split, context, TextRecordReaderWrapper.class);
045      }
046    
047      /**
048       * A record reader that may be passed to <code>CombineFileRecordReader</code>
049       * so that it can be used in a <code>CombineFileInputFormat</code>-equivalent
050       * for <code>TextInputFormat</code>.
051       *
052       * @see CombineFileRecordReader
053       * @see CombineFileInputFormat
054       * @see TextInputFormat
055       */
056      private static class TextRecordReaderWrapper
057        extends CombineFileRecordReaderWrapper<LongWritable,Text> {
058        // this constructor signature is required by CombineFileRecordReader
059        public TextRecordReaderWrapper(CombineFileSplit split,
060          TaskAttemptContext context, Integer idx)
061          throws IOException, InterruptedException {
062          super(new TextInputFormat(), split, context, idx);
063        }
064      }
065    }