001/*
002 * Copyright (c) 2007-2015 Concurrent, 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  }