001/*
002 * Copyright (c) 2016 Chris K Wensel <chris@wensel.net>. All Rights Reserved.
003 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved.
004 *
005 * Project and contact information: http://www.cascading.org/
006 *
007 * This file is part of the Cascading project.
008 *
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *     http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 */
021
022package cascading.flow.planner.iso.subgraph.partitioner;
023
024import java.util.Collection;
025import java.util.LinkedHashMap;
026import java.util.Map;
027
028import cascading.flow.FlowElement;
029import cascading.flow.planner.PlannerContext;
030import cascading.flow.planner.graph.ElementGraph;
031import cascading.flow.planner.graph.ElementMaskSubGraph;
032import cascading.flow.planner.graph.ElementMultiGraph;
033import cascading.flow.planner.graph.Extent;
034import cascading.flow.planner.iso.subgraph.GraphPartitioner;
035import cascading.flow.planner.iso.subgraph.Partitions;
036import cascading.util.EnumMultiMap;
037
038/**
039 *
040 */
041public class WholeGraphPartitioner extends GraphPartitioner
042  {
043  public WholeGraphPartitioner()
044    {
045    }
046
047  public Partitions partition( PlannerContext plannerContext, ElementGraph elementGraph, Collection<FlowElement> excludes )
048    {
049    Map<ElementGraph, EnumMultiMap> annotatedSubGraphs = new LinkedHashMap<>();
050
051    // need a safe copy
052    if( elementGraph.containsVertex( Extent.head ) )
053      elementGraph = new ElementMaskSubGraph( elementGraph, Extent.head, Extent.tail );
054
055    annotatedSubGraphs.put( new ElementMultiGraph( elementGraph ), new EnumMultiMap() );
056
057    return new Partitions( this, elementGraph, annotatedSubGraphs );
058    }
059  }