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.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.ScopeExpression; 027import cascading.flow.planner.rule.RuleExpression; 028import cascading.flow.planner.rule.expressiongraph.SplicePipeExpressionGraph; 029import cascading.pipe.Group; 030import cascading.pipe.Merge; 031import cascading.pipe.Pipe; 032 033/** 034 * 035 */ 036public class BalanceGroupMergeGroupExpression extends RuleExpression 037 { 038 public BalanceGroupMergeGroupExpression() 039 { 040 super( 041 new SplicePipeExpressionGraph(), 042 043 new ExpressionGraph() 044 .arcs( 045 new FlowElementExpression( Group.class ), 046 new FlowElementExpression( Merge.class ), 047 new FlowElementExpression( Group.class ) ), 048 049 new ExpressionGraph() 050 .arc( 051 new FlowElementExpression( ElementCapture.Primary, Pipe.class ), 052 ScopeExpression.ANY, 053 new FlowElementExpression( Merge.class ) 054 ) 055 ); 056 } 057 }