[120] | 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; |
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| 20 | |
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| 21 | import java.io.IOException; |
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| 22 | |
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| 23 | import org.apache.hadoop.conf.Configuration; |
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| 24 | |
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| 25 | /** |
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| 26 | * The context that is given to the {@link Mapper}. |
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| 27 | * @param <KEYIN> the key input type to the Mapper |
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| 28 | * @param <VALUEIN> the value input type to the Mapper |
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| 29 | * @param <KEYOUT> the key output type from the Mapper |
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| 30 | * @param <VALUEOUT> the value output type from the Mapper |
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| 31 | */ |
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| 32 | public class MapContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> |
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| 33 | extends TaskInputOutputContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> { |
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| 34 | private RecordReader<KEYIN,VALUEIN> reader; |
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| 35 | private InputSplit split; |
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| 36 | |
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| 37 | public MapContext(Configuration conf, TaskAttemptID taskid, |
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| 38 | RecordReader<KEYIN,VALUEIN> reader, |
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| 39 | RecordWriter<KEYOUT,VALUEOUT> writer, |
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| 40 | OutputCommitter committer, |
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| 41 | StatusReporter reporter, |
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| 42 | InputSplit split) { |
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| 43 | super(conf, taskid, writer, committer, reporter); |
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| 44 | this.reader = reader; |
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| 45 | this.split = split; |
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| 46 | } |
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| 47 | |
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| 48 | /** |
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| 49 | * Get the input split for this map. |
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| 50 | */ |
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| 51 | public InputSplit getInputSplit() { |
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| 52 | return split; |
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| 53 | } |
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| 54 | |
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| 55 | @Override |
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| 56 | public KEYIN getCurrentKey() throws IOException, InterruptedException { |
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| 57 | return reader.getCurrentKey(); |
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| 58 | } |
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| 59 | |
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| 60 | @Override |
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| 61 | public VALUEIN getCurrentValue() throws IOException, InterruptedException { |
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| 62 | return reader.getCurrentValue(); |
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| 63 | } |
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| 64 | |
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| 65 | @Override |
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| 66 | public boolean nextKeyValue() throws IOException, InterruptedException { |
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| 67 | return reader.nextKeyValue(); |
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| 68 | } |
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| 69 | |
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| 70 | } |
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| 71 | |
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