EmptyInputFormat.java
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上传日期:2018-01-08
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- /**
- * 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; }
- };
- }
- }