    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  }