/*
* 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.flink.api.java.hadoop.mapred;
import java.io.IOException;
import org.apache.flink.annotation.Public;
import org.apache.flink.api.java.typeutils.TypeExtractor;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.typeutils.ResultTypeQueryable;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;
import org.apache.hadoop.mapred.JobConf;
/**
* Wrapper for using HadoopInputFormats (mapred-variant) with Flink.
*
* The IF is returning a {@code Tuple2<K,V>}.
*
* @param <K> Type of the key
* @param <V> Type of the value.
*/
@Public
public class HadoopInputFormat<K, V> extends HadoopInputFormatBase<K, V, Tuple2<K,V>> implements ResultTypeQueryable<Tuple2<K,V>> {
private static final long serialVersionUID = 1L;
public HadoopInputFormat(org.apache.hadoop.mapred.InputFormat<K,V> mapredInputFormat, Class<K> key, Class<V> value, JobConf job) {
super(mapredInputFormat, key, value, job);
}
public HadoopInputFormat(org.apache.hadoop.mapred.InputFormat<K,V> mapredInputFormat, Class<K> key, Class<V> value) {
super(mapredInputFormat, key, value, new JobConf());
}
@Override
public Tuple2<K, V> nextRecord(Tuple2<K, V> record) throws IOException {
if(!fetched) {
fetchNext();
}
if(!hasNext) {
return null;
}
record.f0 = key;
record.f1 = value;
fetched = false;
return record;
}
@Override
public TypeInformation<Tuple2<K,V>> getProducedType() {
return new TupleTypeInfo<>(TypeExtractor.createTypeInfo(keyClass), TypeExtractor.createTypeInfo(valueClass));
}
}