﻿/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * 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.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 * 
 * Author							Change						Date
 * ******************************************************************************
 * Mats Alm   		                Added       		        2011-01-08
 * Jan Källman		                License changed GPL-->LGPL  2011-12-27
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OfficeOpenXml.Utils;
using System.Xml;

namespace OfficeOpenXml.DataValidation.Formulas
{

    /// <summary>
    /// This class represents a validation formula. Its value can be specified as a value of the specified datatype or as a formula.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    internal abstract class ExcelDataValidationFormulaValue<T> : ExcelDataValidationFormula
    {
        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="namespaceManager">Namespacemanger of the worksheet</param>
        /// <param name="topNode">validation top node</param>
        /// <param name="formulaPath">xml path of the current formula</param>
        public ExcelDataValidationFormulaValue(XmlNamespaceManager namespaceManager, XmlNode topNode, string formulaPath)
            : base(namespaceManager, topNode, formulaPath)
        {

        }

        private T _value;
        /// <summary>
        /// Typed value
        /// </summary>
        public T Value 
        {
            get
            {
                return _value;
            }
            set
            {
                State = FormulaState.Value;
                _value = value;
                SetXmlNodeString(FormulaPath, GetValueAsString());
            }
        }

        internal override void ResetValue()
        {
            Value = default(T);
        }

    }
}