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.planner.PlannerContext;
024import cascading.flow.planner.Scope;
025import cascading.flow.planner.graph.ElementGraph;
026
027/**
028 *
029 */
030public class OrdinalScopeExpression extends ScopeExpression
031  {
032  public static final OrdinalScopeExpression ORDINAL_ZERO = new OrdinalScopeExpression( 0 );
033  public static final OrdinalScopeExpression NOT_ORDINAL_ZERO = new OrdinalScopeExpression( true, 0 );
034
035  boolean not = false;
036  int ordinal = 0;
037
038  public OrdinalScopeExpression( int ordinal )
039    {
040    this.ordinal = ordinal;
041    }
042
043  public OrdinalScopeExpression( Applies applies, int ordinal )
044    {
045    super( applies );
046    this.ordinal = ordinal;
047    }
048
049  public OrdinalScopeExpression( boolean not, int ordinal )
050    {
051    this.not = not;
052    this.ordinal = ordinal;
053    }
054
055  public OrdinalScopeExpression( Applies applies, boolean not, int ordinal )
056    {
057    super( applies );
058    this.not = not;
059    this.ordinal = ordinal;
060    }
061
062  @Override
063  public boolean applies( PlannerContext plannerContext, ElementGraph elementGraph, Scope scope )
064    {
065    boolean equals = scope.getOrdinal().equals( ordinal );
066
067    if( !not )
068      return equals;
069    else
070      return !equals;
071    }
072  }