    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  }