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  }