/**
* 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.avro.mapred;
import java.io.IOException;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.OutputCollector;
@SuppressWarnings("unchecked")
class MapCollector<OUT,K,V,KO,VO> extends AvroCollector<OUT> {
private final AvroWrapper<OUT> wrapper = new AvroWrapper<OUT>(null);
private final AvroKey<K> keyWrapper = new AvroKey<K>(null);
private final AvroValue<V> valueWrapper = new AvroValue<V>(null);
private OutputCollector<KO,VO> collector;
private boolean isMapOnly;
public MapCollector(OutputCollector<KO,VO> collector, boolean isMapOnly) {
this.collector = collector;
this.isMapOnly = isMapOnly;
}
public void collect(OUT datum) throws IOException {
if (isMapOnly) {
wrapper.datum(datum);
collector.collect((KO)wrapper, (VO)NullWritable.get());
} else {
// split a pair
Pair<K,V> pair = (Pair<K,V>)datum;
keyWrapper.datum(pair.key());
valueWrapper.datum(pair.value());
collector.collect((KO)keyWrapper, (VO)valueWrapper);
}
}
}