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.mapred.lib;
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.conf.Configuration;
026    import org.apache.hadoop.io.LongWritable;
027    import org.apache.hadoop.io.Text;
028    import org.apache.hadoop.mapred.InputSplit;
029    import org.apache.hadoop.mapred.JobConf;
030    import org.apache.hadoop.mapred.RecordReader;
031    import org.apache.hadoop.mapred.Reporter;
032    import org.apache.hadoop.mapred.TextInputFormat;
033    
034    /**
035     * Input format that is a <code>CombineFileInputFormat</code>-equivalent for
036     * <code>TextInputFormat</code>.
037     *
038     * @see CombineFileInputFormat
039     */
040    @InterfaceAudience.Public
041    @InterfaceStability.Stable
042    public class CombineTextInputFormat
043      extends CombineFileInputFormat<LongWritable,Text> {
044      @SuppressWarnings({ "rawtypes", "unchecked" })
045      public RecordReader<LongWritable,Text> getRecordReader(InputSplit split,
046        JobConf conf, Reporter reporter) throws IOException {
047        return new CombineFileRecordReader(conf, (CombineFileSplit)split, reporter,
048          TextRecordReaderWrapper.class);
049      }
050    
051      /**
052       * A record reader that may be passed to <code>CombineFileRecordReader</code>
053       * so that it can be used in a <code>CombineFileInputFormat</code>-equivalent
054       * for <code>TextInputFormat</code>.
055       *
056       * @see CombineFileRecordReader
057       * @see CombineFileInputFormat
058       * @see TextInputFormat
059       */
060      private static class TextRecordReaderWrapper
061        extends CombineFileRecordReaderWrapper<LongWritable,Text> {
062        // this constructor signature is required by CombineFileRecordReader
063        public TextRecordReaderWrapper(CombineFileSplit split, Configuration conf,
064          Reporter reporter, Integer idx) throws IOException {
065          super(new TextInputFormat(), split, conf, reporter, idx);
066        }
067      }
068    }