/*
* 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.planner.iso.subgraph.partitioner;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
import cascading.flow.FlowElement;
import cascading.flow.planner.PlannerContext;
import cascading.flow.planner.graph.ElementGraph;
import cascading.flow.planner.iso.ElementAnnotation;
import cascading.flow.planner.iso.expression.ExpressionGraph;
import cascading.flow.planner.iso.subgraph.GraphPartitioner;
import cascading.flow.planner.iso.subgraph.Partitions;
import cascading.flow.planner.iso.subgraph.SubGraphIterator;
import cascading.flow.planner.iso.subgraph.iterator.ExpressionSubGraphIterator;
import cascading.util.EnumMultiMap;
/**
*
*/
public class ExpressionGraphPartitioner extends GraphPartitioner
{
protected ExpressionGraph contractionGraph;
protected ExpressionGraph expressionGraph;
protected ElementAnnotation[] annotations = new ElementAnnotation[ 0 ];
public ExpressionGraphPartitioner( ExpressionGraph contractionGraph, ExpressionGraph expressionGraph, ElementAnnotation... annotations )
{
this.contractionGraph = contractionGraph;
this.expressionGraph = expressionGraph;
this.annotations = annotations;
}
public ExpressionGraph getContractionGraph()
{
return contractionGraph;
}
public ExpressionGraph getExpressionGraph()
{
return expressionGraph;
}
public ElementAnnotation[] getAnnotations()
{
return annotations;
}
public void setAnnotations( ElementAnnotation[] annotations )
{
this.annotations = annotations;
}
@Override
public Partitions partition( PlannerContext plannerContext, ElementGraph elementGraph, Collection<FlowElement> excludes )
{
Map<ElementGraph, EnumMultiMap> annotatedSubGraphs = new LinkedHashMap<>();
ExpressionSubGraphIterator expressionIterator = new ExpressionSubGraphIterator( plannerContext, contractionGraph, expressionGraph, elementGraph, excludes );
SubGraphIterator stepIterator = wrapIterator( expressionIterator );
while( stepIterator.hasNext() )
{
ElementGraph next = stepIterator.next();
EnumMultiMap annotationMap = stepIterator.getAnnotationMap( annotations );
annotatedSubGraphs.put( next, annotationMap );
}
return new Partitions( this, elementGraph, expressionIterator.getContractedGraph(), expressionIterator.getMatches(), annotatedSubGraphs );
}
protected SubGraphIterator wrapIterator( ExpressionSubGraphIterator expressionIterator )
{
return expressionIterator;
}
}