cascading.flow.hadoop.planner.rule.expressiongraph.MalformedJoinExpressionGraph Maven / Gradle / Ivy
/*
* Copyright (c) 2007-2017 Xplenty, 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.hadoop.planner.rule.expressiongraph;
import cascading.flow.FlowElement;
import cascading.flow.planner.PlannerContext;
import cascading.flow.planner.graph.ElementGraph;
import cascading.flow.planner.iso.expression.ElementCapture;
import cascading.flow.planner.iso.expression.ExpressionGraph;
import cascading.flow.planner.iso.expression.FlowElementExpression;
import cascading.flow.planner.iso.expression.TypeExpression;
import cascading.flow.planner.iso.finder.SearchOrder;
import cascading.pipe.HashJoin;
import cascading.pipe.Splice;
import static cascading.flow.planner.iso.expression.AndElementExpression.and;
import static cascading.flow.planner.iso.expression.NotElementExpression.not;
/**
*
*/
public class MalformedJoinExpressionGraph extends ExpressionGraph
{
public MalformedJoinExpressionGraph()
{
super(
SearchOrder.ReverseDepth,
and( ElementCapture.Primary,
new FlowElementExpression( HashJoin.class )
{
@Override
public boolean applies( PlannerContext plannerContext, ElementGraph elementGraph, FlowElement flowElement )
{
return super.applies( plannerContext, elementGraph, flowElement ) && !( (Splice) flowElement ).isSelfJoin();
}
},
not( new FlowElementExpression( HashJoin.class, TypeExpression.Topo.SpliceOnly ) )
)
);
}
}