// Copyright 2006 - 2008: Rory Plaire (codekaizen@gmail.com)

//

// This file is part of SharpMap.

// SharpMap is free software; you can redistribute it and/or modify

// it under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation; either version 2 of the License, or

// (at your option) any later version.

//

// SharpMap is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License

// along with SharpMap; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

using System;

using GeoAPI.CoordinateSystems;

using GeoAPI.Geometries;

namespace SharpMap.Expressions

{

public abstract class SpatialExpression : Expression, IEquatable<SpatialExpression>

{

public abstract Boolean Equals(SpatialExpression other);

public abstract Boolean IsNull { get; }

public abstract Boolean IsEmpty { get; }

public abstract IExtents Extents { get; }

public abstract ICoordinateSystem SpatialReference { get; }

public static Boolean IsNullOrEmpty(SpatialExpression spatialExpression)

{

return spatialExpression == null ||

spatialExpression.IsEmpty ||

spatialExpression.IsNull;

}

}

}