/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.mapred;
import java.io.IOException;
import org.apache.hadoop.fs.FileSystem;
/**
* InputFormat which simulates the absence of input data
* by returning zero split.
*/
public class EmptyInputFormat<K, V> implements InputFormat<K, V> {
public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
return new InputSplit[0];
}
public RecordReader<K, V> getRecordReader(InputSplit split, JobConf job,
Reporter reporter) throws IOException {
return new RecordReader<K,V>() {
public boolean next(K key, V value) throws IOException { return false; }
public K createKey() { return null; }
public V createValue() { return null; }
public long getPos() throws IOException { return 0L; }
public void close() throws IOException { }
public float getProgress() throws IOException { return 0.0f; }
};
}
}