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.iso.expression;
022
023import cascading.flow.FlowElement;
024import cascading.flow.planner.PlannerContext;
025import cascading.flow.planner.graph.ElementGraph;
026import cascading.operation.PlannedOperation;
027import cascading.operation.PlannerLevel;
028import cascading.pipe.Operator;
029
030/**
031 *
032 */
033public class PlannerLevelElementExpression extends ElementExpression
034  {
035  private final Class<? extends PlannerLevel> plannerLevelClass;
036
037  protected PlannerLevelElementExpression( ElementCapture capture, Class<? extends PlannerLevel> plannerLevelClass )
038    {
039    super( capture );
040    this.plannerLevelClass = plannerLevelClass;
041    }
042
043  @Override
044  public boolean applies( PlannerContext plannerContext, ElementGraph elementGraph, FlowElement flowElement )
045    {
046    if( !( flowElement instanceof Operator ) )
047      return false;
048
049    Operator operator = (Operator) flowElement;
050
051    if( !operator.hasPlannerLevel() )
052      return false;
053
054    PlannerLevel plannerLevel = plannerContext.getPlannerLevelFor( plannerLevelClass );
055
056    if( plannerLevel == null )
057      return false;
058
059    if( !( (PlannedOperation) operator.getOperation() ).supportsPlannerLevel( plannerLevel ) )
060      return false;
061
062    return operator.getPlannerLevel().isStricterThan( plannerLevel );
063    }
064  }