    001/*
    002 * Copyright (c) 2016 Chris K Wensel <chris@wensel.net>. All Rights Reserved.
    003 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved.
    004 *
    005 * Project and contact information: http://www.cascading.org/
    006 *
    007 * This file is part of the Cascading project.
    008 *
    009 * Licensed under the Apache License, Version 2.0 (the "License");
    010 * you may not use this file except in compliance with the License.
    011 * You may obtain a copy of the License at
    012 *
    013 *     http://www.apache.org/licenses/LICENSE-2.0
    014 *
    015 * Unless required by applicable law or agreed to in writing, software
    016 * distributed under the License is distributed on an "AS IS" BASIS,
    017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    018 * See the License for the specific language governing permissions and
    019 * limitations under the License.
    020 */
    021
    022package cascading.flow.tez.planner.rule.expressiongraph;
    023
    024import cascading.flow.planner.iso.expression.AnnotationExpression;
    025import cascading.flow.planner.iso.expression.ElementCapture;
    026import cascading.flow.planner.iso.expression.ElementExpression;
    027import cascading.flow.planner.iso.expression.ExpressionGraph;
    028import cascading.flow.planner.iso.expression.FlowElementExpression;
    029import cascading.flow.planner.iso.expression.PathScopeExpression;
    030import cascading.flow.planner.iso.expression.TypeExpression;
    031import cascading.flow.planner.iso.finder.SearchOrder;
    032import cascading.flow.planner.rule.elementexpression.BoundariesElementExpression;
    033import cascading.flow.stream.graph.IORole;
    034import cascading.pipe.Boundary;
    035import cascading.pipe.Group;
    036import cascading.pipe.HashJoin;
    037import cascading.pipe.Merge;
    038import cascading.tap.Tap;
    039
    040import static cascading.flow.planner.iso.expression.AndElementExpression.and;
    041import static cascading.flow.planner.iso.expression.NotElementExpression.not;
    042import static cascading.flow.planner.iso.expression.OrElementExpression.or;
    043
    044/**
    045 *
    046 */
    047public class BottomUpConsecutiveBoundariesExpressionGraph extends ExpressionGraph
    048  {
    049  public BottomUpConsecutiveBoundariesExpressionGraph()
    050    {
    051    super( SearchOrder.ReverseTopological );
    052
    053    ElementExpression head = or(
    054      new FlowElementExpression( Boundary.class ),
    055      new FlowElementExpression( Tap.class ),
    056      new FlowElementExpression( Group.class, TypeExpression.Topo.LinearOut ),
    057      new FlowElementExpression( Merge.class, TypeExpression.Topo.LinearOut )
    058    );
    059
    060    FlowElementExpression shared = new FlowElementExpression( ElementCapture.Secondary, HashJoin.class );
    061
    062    ElementExpression tail = or(
    063      ElementCapture.Primary,
    064      and(
    065        new BoundariesElementExpression( TypeExpression.Topo.LinearIn ),
    066        not( new AnnotationExpression( IORole.sink ) )
    067      ),
    068      new BoundariesElementExpression( TypeExpression.Topo.Splice )
    069    );
    070
    071    this.arc(
    072      head,
    073
    074      PathScopeExpression.ANY,
    075
    076      shared
    077    );
    078
    079    this.arc(
    080      shared,
    081
    082      PathScopeExpression.ANY,
    083
    084      tail
    085    );
    086    }
    087  }