001/* 002 * Copyright (c) 2007-2015 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.hadoop.planner.rule.expression; 022 023import cascading.flow.planner.iso.expression.ElementCapture; 024import cascading.flow.planner.iso.expression.ExpressionGraph; 025import cascading.flow.planner.iso.expression.FlowElementExpression; 026import cascading.flow.planner.iso.expression.PathScopeExpression; 027import cascading.flow.planner.rule.RuleExpression; 028import cascading.flow.planner.rule.expressiongraph.SyncPipeExpressionGraph; 029import cascading.pipe.HashJoin; 030import cascading.pipe.Pipe; 031 032/** 033 * 034 */ 035public class BalanceHashJoinToHashJoinExpression extends RuleExpression 036 { 037 public BalanceHashJoinToHashJoinExpression() 038 { 039 super( 040 new SyncPipeExpressionGraph(), 041 042 new ExpressionGraph() 043 .arc( 044 new FlowElementExpression( HashJoin.class ), 045 PathScopeExpression.ANY, 046 new FlowElementExpression( HashJoin.class ) 047 ), 048 049 new ExpressionGraph() 050 .arc( 051 new FlowElementExpression( ElementCapture.Primary, Pipe.class ), 052 PathScopeExpression.ANY, 053 new FlowElementExpression( HashJoin.class ) 054 ) 055 ); 056 } 057 }