    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  }