/*
* Copyright (c) 2007-2014 Concurrent, Inc. All Rights Reserved.
*
* Project and contact information: http://www.cascading.org/
*
* This file is part of the Cascading project.
*
* Licensed 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 cascading.flow.hadoop.stream.element;
import cascading.flow.FlowProcess;
import cascading.flow.hadoop.HadoopCoGroupClosure;
import cascading.flow.hadoop.HadoopFlowProcess;
import cascading.flow.hadoop.stream.HadoopGroupGate;
import cascading.flow.stream.duct.Duct;
import cascading.flow.stream.graph.IORole;
import cascading.flow.stream.graph.StreamGraph;
import cascading.pipe.CoGroup;
import cascading.tuple.Tuple;
import cascading.tuple.io.IndexTuple;
import org.apache.hadoop.mapred.OutputCollector;
/**
*
*/
public class HadoopCoGroupGate extends HadoopGroupGate
{
public HadoopCoGroupGate( FlowProcess flowProcess, CoGroup coGroup, IORole role )
{
super( flowProcess, coGroup, role );
}
@Override
public void bind( StreamGraph streamGraph )
{
super.bind( streamGraph );
}
@Override
protected HadoopCoGroupClosure createClosure()
{
return new HadoopCoGroupClosure( flowProcess, splice.getNumSelfJoins(), keyFields, valuesFields );
}
@Override
protected void wrapGroupingAndCollect( Duct previous, Tuple valuesTuple, Tuple groupKey ) throws java.io.IOException
{
Integer ordinal = ordinalMap.get( previous );
collector.collect( new IndexTuple( ordinal, groupKey ), new IndexTuple( ordinal, valuesTuple ) );
}
@Override
protected Tuple unwrapGrouping( Tuple key )
{
return ( (IndexTuple) key ).getTuple();
}
protected OutputCollector createOutputCollector()
{
return ( (HadoopFlowProcess) flowProcess ).getOutputCollector();
}
}