    001/*
    002 * Copyright (c) 2007-2016 Concurrent, Inc. All Rights Reserved.
    003 *
    004 * Project and contact information: http://www.cascading.org/
    005 *
    006 * This file is part of the Cascading project.
    007 *
    008 * Licensed under the Apache License, Version 2.0 (the "License");
    009 * you may not use this file except in compliance with the License.
    010 * You may obtain a copy of the License at
    011 *
    012 *     http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing, software
    015 * distributed under the License is distributed on an "AS IS" BASIS,
    016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017 * See the License for the specific language governing permissions and
    018 * limitations under the License.
    019 */
    020
    021package cascading.flow.hadoop.stream.element;
    022
    023import cascading.flow.FlowProcess;
    024import cascading.flow.hadoop.HadoopCoGroupClosure;
    025import cascading.flow.hadoop.HadoopFlowProcess;
    026import cascading.flow.hadoop.stream.HadoopGroupGate;
    027import cascading.flow.stream.duct.Duct;
    028import cascading.flow.stream.graph.IORole;
    029import cascading.flow.stream.graph.StreamGraph;
    030import cascading.pipe.CoGroup;
    031import cascading.tuple.Tuple;
    032import cascading.tuple.io.IndexTuple;
    033import cascading.tuple.io.KeyIndexTuple;
    034import cascading.tuple.io.ValueIndexTuple;
    035import org.apache.hadoop.mapred.OutputCollector;
    036
    037/**
    038 *
    039 */
    040public class HadoopCoGroupGate extends HadoopGroupGate
    041  {
    042  IndexTuple keyTuple = new KeyIndexTuple();
    043  IndexTuple valueTuple = new ValueIndexTuple();
    044
    045  public HadoopCoGroupGate( FlowProcess flowProcess, CoGroup coGroup, IORole role )
    046    {
    047    super( flowProcess, coGroup, role );
    048    }
    049
    050  @Override
    051  public void bind( StreamGraph streamGraph )
    052    {
    053    super.bind( streamGraph );
    054    }
    055
    056  @Override
    057  protected HadoopCoGroupClosure createClosure()
    058    {
    059    return new HadoopCoGroupClosure( flowProcess, splice.getNumSelfJoins(), keyFields, valuesFields );
    060    }
    061
    062  @Override
    063  protected void wrapGroupingAndCollect( Duct previous, Tuple valuesTuple, Tuple groupKey ) throws java.io.IOException
    064    {
    065    Integer ordinal = ordinalMap.get( previous );
    066
    067    keyTuple.setIndex( ordinal );
    068    keyTuple.setTuple( groupKey );
    069
    070    valueTuple.setIndex( ordinal );
    071    valueTuple.setTuple( valuesTuple );
    072
    073    collector.collect( keyTuple, valueTuple );
    074    }
    075
    076  @Override
    077  protected Tuple unwrapGrouping( Tuple key )
    078    {
    079    return ( (IndexTuple) key ).getTuple();
    080    }
    081
    082  protected OutputCollector createOutputCollector()
    083    {
    084    return ( (HadoopFlowProcess) flowProcess ).getOutputCollector();
    085    }
    086  }