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
019package org.apache.hadoop.mapreduce.lib.input;
020
021import java.io.IOException;
022
023import org.apache.hadoop.classification.InterfaceAudience;
024import org.apache.hadoop.classification.InterfaceStability;
025import org.apache.hadoop.io.LongWritable;
026import org.apache.hadoop.io.Text;
027import org.apache.hadoop.mapreduce.InputSplit;
028import org.apache.hadoop.mapreduce.RecordReader;
029import 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
039public 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}