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.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.ElementDirectedGraph;
030import cascading.flow.planner.graph.ElementGraph;
031import cascading.flow.planner.graph.ElementMaskSubGraph;
032import cascading.flow.planner.graph.Extent;
033import cascading.flow.planner.iso.subgraph.GraphPartitioner;
034import cascading.flow.planner.iso.subgraph.Partitions;
035import cascading.util.EnumMultiMap;
036
037/**
038 *
039 */
040public class WholeGraphPartitioner extends GraphPartitioner
041  {
042  public WholeGraphPartitioner()
043    {
044    }
045
046  public Partitions partition( PlannerContext plannerContext, ElementGraph elementGraph, Collection<FlowElement> excludes )
047    {
048    Map<ElementGraph, EnumMultiMap> annotatedSubGraphs = new LinkedHashMap<>();
049
050    // need a safe copy
051    if( elementGraph.containsVertex( Extent.head ) )
052      elementGraph = new ElementMaskSubGraph( elementGraph, Extent.head, Extent.tail );
053
054    annotatedSubGraphs.put( new ElementDirectedGraph( elementGraph ), new EnumMultiMap() );
055
056    return new Partitions( this, elementGraph, annotatedSubGraphs );
057    }
058  }