Bibliobrol : le DAO

using be.gaudry.bibliobrol.config;
using be.gaudry.bibliobrol.model.enums;
using be.gaudry.bibliobrol.model.dao.config;
 
namespace be.gaudry.bibliobrol.model.dao
{
    /// <summary>
    /// Provides concrete persistence classes for the persistent type defined in the user settings
    /// </summary>
    public abstract class DAOFactory
    {
 
        #region singleton
        protected static DAOFactory instance = null;
        static readonly object threadLockObject = new object();
        protected DAOFactory() { }
        /// <summary>
        /// Get unique instance of <code>DAOFactory</code> providing methods to access to the persistent layer.
        /// </summary>
        public static DAOFactory Instance
        {
            get
            {
                lock (threadLockObject)
                {
                    if (instance == null)
                    {
                        resetDAO();
                    }
                    return instance;
                }
            }
        }
        /// <summary>
        /// Resets unique instance of <code>DAOFactory</code> to use another persistent layer.<br />
        /// <b><u>Be extremly carefull with using this method :</u></b> if application is not restarted, 
        /// inconsistent data between old persistent layer
        /// and new persistent layer will crash the application and the persistent storage.
        /// </summary>
        public static void resetDAO()
        {
            PERSISTENCE_TYPE persistentType = Config.PersistentType;
 
            switch (persistentType)
            {
                //case PERSISTENCE_TYPE.SQLExpress:
                //case PERSISTENCE_TYPE.MySQL:
                //    instance = new mysql.MySQLFactory();
                //    break;
                //case PERSISTENCE_TYPE.Access:
                default:
                    instance = new msaccess.AccessFactory();
                    break;
            }
        }
        #endregion
 
        #region getDao methods to implement
        public abstract AbstractDBConfig getDBConfig();
        public abstract IConfigDao getConfigDao();
        public abstract IPersonDao getPersonDao();
        public abstract IBrolDao getBrolDao();
        public abstract IMediaBrolDao getMediaBrolDao();
        public abstract ITaskDao getTaskDao();
        public abstract IExporterDao getExporterDao();
        public abstract IImporterDao getImporterDao();
        public abstract IStatsDao getStatsDao();
        public abstract ISerieDao getSerieDao(); 
        #endregion
    }
}