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.annotator; 022 023import cascading.flow.planner.iso.ElementAnnotation; 024import cascading.flow.planner.iso.expression.ElementCapture; 025import cascading.flow.planner.rule.PlanPhase; 026import cascading.flow.planner.rule.expression.LogicalMergeAnnotatorExpression; 027import cascading.flow.planner.rule.transformer.RuleAnnotationTransformer; 028import cascading.flow.stream.annotations.RoleMode; 029import cascading.pipe.Merge; 030 031/** 032 * A logic merge is where a {@link Merge} merges the same input, and subsequently node boundaries do not need to be 033 * traversed 034 */ 035public class LogicalMergeAnnotator extends RuleAnnotationTransformer 036 { 037 public LogicalMergeAnnotator() 038 { 039 super( 040 PlanPhase.PreResolveAssembly, 041 new LogicalMergeAnnotatorExpression(), 042 new ElementAnnotation( ElementCapture.Secondary, RoleMode.Logical ) 043 ); 044 } 045 }