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;
020    
021    import java.io.*;
022    
023    import org.apache.hadoop.classification.InterfaceAudience;
024    import org.apache.hadoop.classification.InterfaceStability;
025    import org.apache.hadoop.fs.*;
026    import org.apache.hadoop.io.LongWritable;
027    import org.apache.hadoop.io.Text;
028    import 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
037    public 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    }