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 }