    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 cascading.flow.planner.iso.ElementAnnotation;
    025import cascading.flow.planner.iso.expression.ExpressionGraph;
    026import cascading.flow.planner.iso.subgraph.SubGraphIterator;
    027import cascading.flow.planner.iso.subgraph.iterator.ExpressionSubGraphIterator;
    028import cascading.flow.planner.iso.subgraph.iterator.IncludeRemainderSubGraphIterator;
    029import cascading.flow.planner.iso.subgraph.iterator.UniquePathSubGraphIterator;
    030
    031/**
    032 *
    033 */
    034public class UniquePathGraphPartitioner extends ExpressionGraphPartitioner
    035  {
    036  boolean includeRemainders = false;
    037  private boolean multiEdge = false; // experimental -- disable
    038
    039  public UniquePathGraphPartitioner( ExpressionGraph contractionGraph, ExpressionGraph expressionGraph, ElementAnnotation... annotations )
    040    {
    041    super( contractionGraph, expressionGraph, annotations );
    042    }
    043
    044  public UniquePathGraphPartitioner( ExpressionGraph contractionGraph, ExpressionGraph expressionGraph, boolean includeRemainders, ElementAnnotation... annotations )
    045    {
    046    super( contractionGraph, expressionGraph, annotations );
    047    this.includeRemainders = includeRemainders;
    048    }
    049
    050  @Override
    051  protected SubGraphIterator wrapIterator( ExpressionSubGraphIterator expressionIterator )
    052    {
    053    if( !includeRemainders )
    054      return new UniquePathSubGraphIterator( expressionIterator, true, multiEdge );
    055
    056    return new IncludeRemainderSubGraphIterator( new UniquePathSubGraphIterator( expressionIterator, true, multiEdge ), multiEdge );
    057    }
    058  }