001/*
002 * Copyright (c) 2007-2017 Xplenty, 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.planner.iso.subgraph.partitioner;
022
023import java.util.Collection;
024import java.util.LinkedHashMap;
025import java.util.Map;
026
027import cascading.flow.FlowElement;
028import cascading.flow.planner.PlannerContext;
029import cascading.flow.planner.graph.ElementGraph;
030import cascading.flow.planner.iso.ElementAnnotation;
031import cascading.flow.planner.iso.expression.ExpressionGraph;
032import cascading.flow.planner.iso.subgraph.GraphPartitioner;
033import cascading.flow.planner.iso.subgraph.Partitions;
034import cascading.flow.planner.iso.subgraph.SubGraphIterator;
035import cascading.flow.planner.iso.subgraph.iterator.ExpressionSubGraphIterator;
036import cascading.util.EnumMultiMap;
037
038/**
039 *
040 */
041public class ExpressionGraphPartitioner extends GraphPartitioner
042  {
043  protected ExpressionGraph contractionGraph;
044  protected ExpressionGraph expressionGraph;
045  protected ElementAnnotation[] annotations = new ElementAnnotation[ 0 ];
046
047  public ExpressionGraphPartitioner( ExpressionGraph contractionGraph, ExpressionGraph expressionGraph, ElementAnnotation... annotations )
048    {
049    this.contractionGraph = contractionGraph;
050    this.expressionGraph = expressionGraph;
051    this.annotations = annotations;
052    }
053
054  public ExpressionGraph getContractionGraph()
055    {
056    return contractionGraph;
057    }
058
059  public ExpressionGraph getExpressionGraph()
060    {
061    return expressionGraph;
062    }
063
064  public ElementAnnotation[] getAnnotations()
065    {
066    return annotations;
067    }
068
069  public void setAnnotations( ElementAnnotation[] annotations )
070    {
071    this.annotations = annotations;
072    }
073
074  @Override
075  public Partitions partition( PlannerContext plannerContext, ElementGraph elementGraph, Collection<FlowElement> excludes )
076    {
077    Map<ElementGraph, EnumMultiMap> annotatedSubGraphs = new LinkedHashMap<>();
078
079    ExpressionSubGraphIterator expressionIterator = new ExpressionSubGraphIterator( plannerContext, contractionGraph, expressionGraph, elementGraph, excludes );
080
081    SubGraphIterator stepIterator = wrapIterator( expressionIterator );
082
083    while( stepIterator.hasNext() )
084      {
085      ElementGraph next = stepIterator.next();
086      EnumMultiMap annotationMap = stepIterator.getAnnotationMap( annotations );
087
088      annotatedSubGraphs.put( next, annotationMap );
089      }
090
091    return new Partitions( this, elementGraph, expressionIterator.getContractedGraph(), expressionIterator.getMatches(), annotatedSubGraphs );
092    }
093
094  protected SubGraphIterator wrapIterator( ExpressionSubGraphIterator expressionIterator )
095    {
096    return expressionIterator;
097    }
098  }