/*
* 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.iso.expression;
import cascading.flow.FlowElement;
import cascading.flow.planner.PlannerContext;
import cascading.flow.planner.graph.ElementGraph;
import cascading.operation.PlannedOperation;
import cascading.operation.PlannerLevel;
import cascading.pipe.Operator;
/**
*
*/
public class PlannerLevelElementExpression extends ElementExpression
{
private final Class<? extends PlannerLevel> plannerLevelClass;
protected PlannerLevelElementExpression( ElementCapture capture, Class<? extends PlannerLevel> plannerLevelClass )
{
super( capture );
this.plannerLevelClass = plannerLevelClass;
}
@Override
public boolean applies( PlannerContext plannerContext, ElementGraph elementGraph, FlowElement flowElement )
{
if( !( flowElement instanceof Operator ) )
return false;
Operator operator = (Operator) flowElement;
if( !operator.hasPlannerLevel() )
return false;
PlannerLevel plannerLevel = plannerContext.getPlannerLevelFor( plannerLevelClass );
if( plannerLevel == null )
return false;
if( !( (PlannedOperation) operator.getOperation() ).supportsPlannerLevel( plannerLevel ) )
return false;
return operator.getPlannerLevel().isStricterThan( plannerLevel );
}
}