1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.mapreduce.lib.input; |
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20 | |
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21 | import org.apache.hadoop.fs.Path; |
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22 | import org.apache.hadoop.io.LongWritable; |
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23 | import org.apache.hadoop.io.Text; |
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24 | import org.apache.hadoop.io.compress.CompressionCodec; |
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25 | import org.apache.hadoop.io.compress.CompressionCodecFactory; |
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26 | import org.apache.hadoop.mapreduce.InputFormat; |
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27 | import org.apache.hadoop.mapreduce.InputSplit; |
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28 | import org.apache.hadoop.mapreduce.JobContext; |
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29 | import org.apache.hadoop.mapreduce.RecordReader; |
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30 | import org.apache.hadoop.mapreduce.TaskAttemptContext; |
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31 | |
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32 | /** An {@link InputFormat} for plain text files. Files are broken into lines. |
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33 | * Either linefeed or carriage-return are used to signal end of line. Keys are |
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34 | * the position in the file, and values are the line of text.. */ |
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35 | public class TextInputFormat extends FileInputFormat<LongWritable, Text> { |
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36 | |
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37 | @Override |
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38 | public RecordReader<LongWritable, Text> |
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39 | createRecordReader(InputSplit split, |
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40 | TaskAttemptContext context) { |
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41 | return new LineRecordReader(); |
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42 | } |
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43 | |
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44 | @Override |
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45 | protected boolean isSplitable(JobContext context, Path file) { |
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46 | CompressionCodec codec = |
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47 | new CompressionCodecFactory(context.getConfiguration()).getCodec(file); |
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48 | return codec == null; |
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49 | } |
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50 | |
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51 | } |
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