///////////////////////////////////////////////////////////
//  Bool.cs
//  Implementation of Class UnitExistanceChecker
//  CSLA type: Read-only object
//  Created on: 25-Sept-2007
//  Object design: John 
//	Coded: 25-Sept-2007
///////////////////////////////////////////////////////////

using System;
using System.Data;
using CSLA.Data;
using GZTW.Data;
using CSLA;
using System.Threading;
using CSLA.Security;
using System.ComponentModel;



namespace GZTW.AyaNova.BLL
{
    //case 500
    /// <summary>
    ///Confirms the presence of an Unit
    ///in the AyaNova database
    /// </summary>
    [Serializable, EditorBrowsable(EditorBrowsableState.Never)]
    internal class UnitExistanceChecker : ReadOnlyBase
    {

        #region Attributes
        private bool mExists;
        #endregion

        #region Constructor

        /// <summary>
        /// Private constructor to prevent direct instantiation
        /// </summary>
        private UnitExistanceChecker()
        {

        }
        #endregion


        #region Static methods




        internal static bool UnitExists(Guid ID, string SerialNumber)
        {

            return ((UnitExistanceChecker)DataPortal.Fetch(new Criteria(ID, SerialNumber))).mExists;

        }


        #endregion

        #region DAL DATA ACCESS
        /// 
        /// <param Bool="Criteria"></param>
        protected override void DataPortal_Fetch(object Criteria)
        {
            Criteria crit = (Criteria)Criteria;
            if (!string.IsNullOrEmpty(crit.SerialNumber))
            {
                //case 1890
                string CaseInsensitiveQueryString = string.Empty;
                if(DBUtil.DB.DBType == DataBaseType.FireBird)
                {
                    CaseInsensitiveQueryString = "SELECT AID FROM AUNIT WHERE (Upper(ASERIAL) = Upper(@SERIAL))";
                }
                else
                {
                    //SQL server so for performance let SQL do the collating since it's easily set unlike firebird
                    CaseInsensitiveQueryString = "SELECT AID FROM AUNIT WHERE (ASERIAL = @SERIAL)";
                }

                DBCommandWrapper dbCommandWrapper = DBUtil.DB.GetSqlStringCommandWrapper(CaseInsensitiveQueryString);
                dbCommandWrapper.AddInParameter("@SERIAL", DbType.String, crit.SerialNumber);
                if (DBUtil.ToGuid(DBUtil.DB.ExecuteScalar(dbCommandWrapper)) == Guid.Empty)
                    this.mExists = false;
                else
                    this.mExists = true;


            }
            else
            {
                if (DBUtil.ToGuid(DBUtil.GetScalarFromSQLString(
                    "SELECT aID FROM aUnit WHERE " +
                        "(aID = @ID)", crit.ID
                    )) == Guid.Empty)
                    this.mExists = false;
                else
                    this.mExists = true;
            }

        }



        #endregion

        #region criteria
        /// <summary>
        /// Criteria for identifying existing object
        /// </summary>
        [Serializable]
        private class Criteria
        {

            public Guid ID;
            public string SerialNumber;
            public Criteria(Guid _ID, string _SerialNumber)
            {
                ID = _ID;
                SerialNumber = _SerialNumber;

            }

        }
        #endregion

    }//end class

}//end namespace GZTW.AyaNova.BLL