    001/*
    002 * Copyright (c) 2007-2016 Concurrent, 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  }