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 }