1 | /** |
---|
2 | * Licensed to the Apache Software Foundation (ASF) under one |
---|
3 | * or more contributor license agreements. See the NOTICE file |
---|
4 | * distributed with this work for additional information |
---|
5 | * regarding copyright ownership. The ASF licenses this file |
---|
6 | * to you under the Apache License, Version 2.0 (the |
---|
7 | * "License"); you may not use this file except in compliance |
---|
8 | * with the License. You may obtain a copy of the License at |
---|
9 | * |
---|
10 | * http://www.apache.org/licenses/LICENSE-2.0 |
---|
11 | * |
---|
12 | * Unless required by applicable law or agreed to in writing, software |
---|
13 | * distributed under the License is distributed on an "AS IS" BASIS, |
---|
14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
15 | * See the License for the specific language governing permissions and |
---|
16 | * limitations under the License. |
---|
17 | */ |
---|
18 | package org.apache.hadoop.mapred; |
---|
19 | |
---|
20 | import java.io.IOException; |
---|
21 | |
---|
22 | import org.apache.hadoop.fs.FileSystem; |
---|
23 | |
---|
24 | /** |
---|
25 | * InputFormat which simulates the absence of input data |
---|
26 | * by returning zero split. |
---|
27 | */ |
---|
28 | public class EmptyInputFormat<K, V> implements InputFormat<K, V> { |
---|
29 | |
---|
30 | public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException { |
---|
31 | return new InputSplit[0]; |
---|
32 | } |
---|
33 | |
---|
34 | public RecordReader<K, V> getRecordReader(InputSplit split, JobConf job, |
---|
35 | Reporter reporter) throws IOException { |
---|
36 | return new RecordReader<K,V>() { |
---|
37 | public boolean next(K key, V value) throws IOException { return false; } |
---|
38 | public K createKey() { return null; } |
---|
39 | public V createValue() { return null; } |
---|
40 | public long getPos() throws IOException { return 0L; } |
---|
41 | public void close() throws IOException { } |
---|
42 | public float getProgress() throws IOException { return 0.0f; } |
---|
43 | }; |
---|
44 | } |
---|
45 | } |
---|