﻿//
// Revit IFC Import library: this library works with Autodesk(R) Revit(R) to import IFC files.
// Copyright (C) 2015  Autodesk, Inc.
// 
// This library 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 2.1 of the License, or (at your option) any later version.
//
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Revit.IFC.Common.Enums;
using Autodesk.Revit.DB.IFC;
using Revit.IFC.Common.Utility;

namespace Revit.IFC.Import.Data
{
    /// <summary>
    /// Represents an IfcFeatureElementSubtraction.
    /// </summary>
    public class IFCFeatureElementSubtraction : IFCFeatureElement
    {
        protected IFCElement m_VoidsElement = null;

        /// <summary>
        /// The element this opening is voiding (e.g., a wall).
        /// This is set initially by the host object.
        /// </summary>
        public IFCElement VoidsElement
        {
            get { return m_VoidsElement; }
            set { m_VoidsElement = value; }
        }

        /// <summary>
        /// Default constructor.
        /// </summary>
        protected IFCFeatureElementSubtraction()
        {

        }

        /// <summary>
        /// Constructs an IFCFeatureElementSubtraction from the IfcFeatureElementSubtraction handle.
        /// </summary>
        /// <param name="ifcFeatureElementSubtraction">The IfcFeatureElementSubtraction handle.</param>
        protected IFCFeatureElementSubtraction(IFCAnyHandle ifcFeatureElementSubtraction)
        {
            Process(ifcFeatureElementSubtraction);
        }

        /// <summary>
        /// Processes IfcFeatureElementSubtraction attributes.
        /// </summary>
        /// <param name="ifcFeatureElementSubtraction">The IfcFeatureElementSubtraction handle.</param>
        protected override void Process(IFCAnyHandle ifcFeatureElementSubtraction)
        {
            base.Process(ifcFeatureElementSubtraction);
        }

        /// <summary>
        /// Processes an IfcFeatureElementSubtraction object.
        /// </summary>
        /// <param name="ifcFeatureElementSubtraction">The IfcFeatureElementSubtraction handle.</param>
        /// <returns>The iFCFeatureElementSubtraction object.</returns>
        public static IFCFeatureElementSubtraction ProcessIFCFeatureElementSubtraction(IFCAnyHandle ifcFeatureElementSubtraction)
        {
            if (IFCAnyHandleUtil.IsNullOrHasNoValue(ifcFeatureElementSubtraction))
            {
                Importer.TheLog.LogNullError(IFCEntityType.IfcFeatureElementSubtraction);
                return null;
            }

            IFCEntity cachedFeatureElementSubtraction;
            if (IFCImportFile.TheFile.EntityMap.TryGetValue(ifcFeatureElementSubtraction.StepId, out cachedFeatureElementSubtraction))
                return (cachedFeatureElementSubtraction as IFCFeatureElementSubtraction);
            
            if (IFCAnyHandleUtil.IsSubTypeOf(ifcFeatureElementSubtraction, IFCEntityType.IfcOpeningElement))
                return IFCOpeningElement.ProcessIFCOpeningElement(ifcFeatureElementSubtraction);

            return new IFCFeatureElementSubtraction(ifcFeatureElementSubtraction);
        }
    }
}
