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  }