001/* 002 * Copyright (c) 2016 Chris K Wensel <chris@wensel.net>. 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.rule.expressiongraph; 022 023import cascading.flow.planner.iso.expression.ElementCapture; 024import cascading.flow.planner.iso.expression.ElementExpression; 025import cascading.flow.planner.iso.expression.ExpressionGraph; 026import cascading.flow.planner.iso.expression.FlowElementExpression; 027import cascading.flow.planner.iso.expression.JoinEdgesSameSourceScopeExpression; 028import cascading.flow.planner.iso.expression.OrElementExpression; 029import cascading.flow.planner.iso.finder.SearchOrder; 030import cascading.pipe.Group; 031import cascading.pipe.Merge; 032import cascading.tap.Tap; 033 034import static cascading.flow.planner.iso.expression.TypeExpression.Topo.Splice; 035import static cascading.flow.planner.iso.expression.TypeExpression.Topo.Split; 036 037/** 038 * 039 */ 040public class LogicalMergeExpressionGraph extends ExpressionGraph 041 { 042 public LogicalMergeExpressionGraph() 043 { 044 super( SearchOrder.ReverseDepth ); 045 046 ElementExpression source = OrElementExpression.or( ElementCapture.Primary, new FlowElementExpression( Tap.class, Split ), new FlowElementExpression( Group.class, Split ) ); 047 ElementExpression sink = new FlowElementExpression( ElementCapture.Secondary, Merge.class, Splice ); 048 049 this.arc( 050 source, 051 JoinEdgesSameSourceScopeExpression.ALL_SAME_SOURCE, 052 sink 053 ); 054 } 055 }