/*
* Copyright (c) 2007-2014 Concurrent, Inc. All Rights Reserved.
*
* Project and contact information: http://www.cascading.org/
*
* This file is part of the Cascading project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cascading.flow.planner.rule.expressiongraph;
import cascading.flow.planner.iso.expression.ElementCapture;
import cascading.flow.planner.iso.expression.ElementExpression;
import cascading.flow.planner.iso.expression.ExpressionGraph;
import cascading.flow.planner.iso.expression.FlowElementExpression;
import cascading.flow.planner.iso.expression.OrElementExpression;
import cascading.flow.planner.iso.expression.PathScopeExpression;
import cascading.flow.planner.iso.finder.SearchOrder;
import cascading.pipe.Group;
import cascading.pipe.HashJoin;
import cascading.tap.Tap;
import static cascading.flow.planner.iso.expression.OrElementExpression.or;
/**
*
*/
public class NonBlockedBlockedJoinJoinExpressionGraph extends ExpressionGraph
{
public NonBlockedBlockedJoinJoinExpressionGraph()
{
super( SearchOrder.ReverseDepth );
ElementExpression source = OrElementExpression.or( ElementCapture.Primary, new FlowElementExpression( Tap.class ), new FlowElementExpression( Group.class ) );
ElementExpression blocking = or( new FlowElementExpression( HashJoin.class ), new FlowElementExpression( Group.class ) );
ElementExpression sink = new FlowElementExpression( ElementCapture.Secondary, HashJoin.class );
this.arc(
source,
PathScopeExpression.ANY,
blocking
);
this.arc(
blocking,
PathScopeExpression.ANY,
sink
);
this.arc(
source,
PathScopeExpression.ANY,
sink
);
}
}