/*
* 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.stream.element;
import cascading.CascadingException;
import cascading.flow.FlowProcess;
import cascading.flow.stream.duct.Duct;
import cascading.flow.stream.duct.Reducing;
import cascading.operation.GroupAssertion;
import cascading.pipe.Every;
import cascading.pipe.OperatorException;
import cascading.tuple.Fields;
import cascading.tuple.TupleEntry;
/**
*
*/
public class GroupAssertionEveryStage extends EveryStage<TupleEntry> implements Reducing<TupleEntry, TupleEntry>
{
private GroupAssertion groupAssertion;
private Reducing reducing;
public GroupAssertionEveryStage( FlowProcess flowProcess, Every every )
{
super( flowProcess, every );
}
@Override
protected Fields getIncomingPassThroughFields()
{
return incomingScopes.get( 0 ).getIncomingAggregatorPassThroughFields();
}
@Override
protected Fields getIncomingArgumentsFields()
{
return incomingScopes.get( 0 ).getIncomingAggregatorArgumentFields();
}
@Override
protected Fields getOutgoingSelector()
{
return outgoingScopes.get( 0 ).getOutGroupingSelector();
}
@Override
public void initialize()
{
super.initialize();
groupAssertion = every.getGroupAssertion();
reducing = (Reducing) getNext();
}
@Override
public void startGroup( Duct previous, TupleEntry groupEntry )
{
operationCall.setGroup( groupEntry );
operationCall.setArguments( null ); // zero it out
operationCall.setOutputCollector( null ); // zero it out
try
{
groupAssertion.start( flowProcess, operationCall );
}
catch( CascadingException exception )
{
handleException( exception, groupEntry );
}
catch( Throwable throwable )
{
handleException( new OperatorException( every, "operator Every failed starting operation: " + every.getOperation(), throwable ), groupEntry );
}
reducing.startGroup( this, groupEntry );
}
@Override
public void receive( Duct previous, TupleEntry tupleEntry )
{
try
{
argumentsEntry.setTuple( argumentsBuilder.makeResult( tupleEntry.getTuple(), null ) );
operationCall.setArguments( argumentsEntry );
groupAssertion.aggregate( flowProcess, operationCall );
}
catch( CascadingException exception )
{
handleException( exception, argumentsEntry );
}
catch( Throwable throwable )
{
handleException( new OperatorException( every, "operator Every failed executing operation: " + every.getOperation(), throwable ), argumentsEntry );
}
next.receive( this, tupleEntry );
}
@Override
public void completeGroup( Duct previous, TupleEntry incomingEntry )
{
this.incomingEntry = incomingEntry;
operationCall.setArguments( null );
try
{
groupAssertion.doAssert( flowProcess, operationCall ); // collector calls next
reducing.completeGroup( this, incomingEntry );
}
catch( CascadingException exception )
{
handleException( exception, incomingEntry );
}
catch( Throwable throwable )
{
handleException( new OperatorException( every, "operator Every failed completing operation: " + every.getOperation(), throwable ), incomingEntry );
}
}
}