    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  }