/// <summary>
/// Accessor method for accessing the single instance of DAO.
/// </summary>
/// <returns>The only instance of DAO</returns>
public static DAO GetInstance()
{
if (instance == null)
{
instance = new DAO();
}
return instance;
}
/// <summary>
/// Private constructor to ensure that Facade is not created outside this class.
/// </summary>
private PersistentStorage()
{
dao = DAO.GetInstance();
fsh = FileSystemHandler.GetInstance();
}