    001/*
    002 * Copyright (c) 2007-2017 Xplenty, Inc. 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.OrElementExpression;
    028import cascading.flow.planner.iso.expression.PathScopeExpression;
    029import cascading.flow.planner.iso.finder.SearchOrder;
    030import cascading.pipe.Group;
    031import cascading.pipe.HashJoin;
    032import cascading.tap.Tap;
    033
    034import static cascading.flow.planner.iso.expression.OrElementExpression.or;
    035
    036/**
    037 *
    038 */
    039public class NonBlockedBlockedJoinJoinExpressionGraph extends ExpressionGraph
    040  {
    041  public NonBlockedBlockedJoinJoinExpressionGraph()
    042    {
    043    super( SearchOrder.ReverseDepth );
    044
    045    ElementExpression source = OrElementExpression.or( ElementCapture.Primary, new FlowElementExpression( Tap.class ), new FlowElementExpression( Group.class ) );
    046    ElementExpression blocking = or( new FlowElementExpression( HashJoin.class ), new FlowElementExpression( Group.class ) );
    047    ElementExpression sink = new FlowElementExpression( ElementCapture.Secondary, HashJoin.class );
    048
    049    this.arc(
    050      source,
    051      PathScopeExpression.ANY,
    052      blocking
    053    );
    054
    055    this.arc(
    056      blocking,
    057      PathScopeExpression.ANY,
    058      sink
    059    );
    060
    061    this.arc(
    062      source,
    063      PathScopeExpression.ANY,
    064      sink
    065    );
    066
    067    }
    068  }