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 cascading.flow.planner.iso.ElementAnnotation;
024import cascading.flow.planner.iso.expression.ExpressionGraph;
025import cascading.flow.planner.iso.subgraph.SubGraphIterator;
026import cascading.flow.planner.iso.subgraph.iterator.ExpressionSubGraphIterator;
027import cascading.flow.planner.iso.subgraph.iterator.IncludeRemainderSubGraphIterator;
028import cascading.flow.planner.iso.subgraph.iterator.UniquePathSubGraphIterator;
029
030/**
031 *
032 */
033public class UniquePathGraphPartitioner extends ExpressionGraphPartitioner
034  {
035  boolean includeRemainders = false;
036
037  public UniquePathGraphPartitioner( ExpressionGraph contractionGraph, ExpressionGraph expressionGraph, ElementAnnotation... annotations )
038    {
039    super( contractionGraph, expressionGraph, annotations );
040    }
041
042  public UniquePathGraphPartitioner( ExpressionGraph contractionGraph, ExpressionGraph expressionGraph, boolean includeRemainders, ElementAnnotation... annotations )
043    {
044    super( contractionGraph, expressionGraph, annotations );
045    this.includeRemainders = includeRemainders;
046    }
047
048  @Override
049  protected SubGraphIterator wrapIterator( ExpressionSubGraphIterator expressionIterator )
050    {
051    if( !includeRemainders )
052      return new UniquePathSubGraphIterator( expressionIterator, true );
053
054    return new IncludeRemainderSubGraphIterator( new UniquePathSubGraphIterator( expressionIterator, true ) );
055    }
056  }