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;
020
021import java.io.*;
022
023import org.apache.hadoop.classification.InterfaceAudience;
024import org.apache.hadoop.classification.InterfaceStability;
025import org.apache.hadoop.fs.*;
026import org.apache.hadoop.io.LongWritable;
027import org.apache.hadoop.io.Text;
028import org.apache.hadoop.io.compress.*;
029
030/** 
031 * An {@link InputFormat} for plain text files.  Files are broken into lines.
032 * Either linefeed or carriage-return are used to signal end of line.  Keys are
033 * the position in the file, and values are the line of text.. 
034 */
035@InterfaceAudience.Public
036@InterfaceStability.Stable
037public class TextInputFormat extends FileInputFormat<LongWritable, Text>
038  implements JobConfigurable {
039
040  private CompressionCodecFactory compressionCodecs = null;
041  
042  public void configure(JobConf conf) {
043    compressionCodecs = new CompressionCodecFactory(conf);
044  }
045  
046  protected boolean isSplitable(FileSystem fs, Path file) {
047    final CompressionCodec codec = compressionCodecs.getCodec(file);
048    if (null == codec) {
049      return true;
050    }
051    return codec instanceof SplittableCompressionCodec;
052  }
053
054  public RecordReader<LongWritable, Text> getRecordReader(
055                                          InputSplit genericSplit, JobConf job,
056                                          Reporter reporter)
057    throws IOException {
058    
059    reporter.setStatus(genericSplit.toString());
060    String delimiter = job.get("textinputformat.record.delimiter");
061    byte[] recordDelimiterBytes = null;
062    if (null != delimiter) recordDelimiterBytes = delimiter.getBytes();
063    return new LineRecordReader(job, (FileSplit) genericSplit,
064        recordDelimiterBytes);
065  }
066}