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.mapred.lib;
020
021import java.io.IOException;
022
023import org.apache.hadoop.classification.InterfaceAudience;
024import org.apache.hadoop.classification.InterfaceStability;
025import org.apache.hadoop.conf.Configuration;
026import org.apache.hadoop.io.LongWritable;
027import org.apache.hadoop.io.Text;
028import org.apache.hadoop.mapred.InputSplit;
029import org.apache.hadoop.mapred.JobConf;
030import org.apache.hadoop.mapred.RecordReader;
031import org.apache.hadoop.mapred.Reporter;
032import 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
042public 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}