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
030import com.google.common.base.Charsets;
031
032/** 
033 * An {@link InputFormat} for plain text files.  Files are broken into lines.
034 * Either linefeed or carriage-return are used to signal end of line.  Keys are
035 * the position in the file, and values are the line of text.. 
036 */
037@InterfaceAudience.Public
038@InterfaceStability.Stable
039public class TextInputFormat extends FileInputFormat<LongWritable, Text>
040  implements JobConfigurable {
041
042  private CompressionCodecFactory compressionCodecs = null;
043  
044  public void configure(JobConf conf) {
045    compressionCodecs = new CompressionCodecFactory(conf);
046  }
047  
048  protected boolean isSplitable(FileSystem fs, Path file) {
049    final CompressionCodec codec = compressionCodecs.getCodec(file);
050    if (null == codec) {
051      return true;
052    }
053    return codec instanceof SplittableCompressionCodec;
054  }
055
056  public RecordReader<LongWritable, Text> getRecordReader(
057                                          InputSplit genericSplit, JobConf job,
058                                          Reporter reporter)
059    throws IOException {
060    
061    reporter.setStatus(genericSplit.toString());
062    String delimiter = job.get("textinputformat.record.delimiter");
063    byte[] recordDelimiterBytes = null;
064    if (null != delimiter) {
065      recordDelimiterBytes = delimiter.getBytes(Charsets.UTF_8);
066    }
067    return new LineRecordReader(job, (FileSplit) genericSplit,
068        recordDelimiterBytes);
069  }
070}