// a method that creates whole booking from the details provided. It never returns AbstractBooking,
// but one of it's descendants
public AbstractBooking CreateBooking(int bookingRef, DateTime startDate, DateTime endDate, Client client, List <Person> guests,
int chaletId, bool eveningMeal, bool breakfast, bool carHire, DateTime hireStart, DateTime hireEnd, string driver)
{
BookingFactorySingleton factory = BookingFactorySingleton.Instance();
return(factory.FactoryMethod(bookingRef, startDate, endDate, client, guests, chaletId, eveningMeal, breakfast, carHire, hireStart, hireEnd, driver));
}
// a method that returns an instance of the class. If there is no instance then it creates a new
// one, if there is it returns that instance
public static BookingFactorySingleton Instance()
{
if (_instance == null)
{
_instance = new BookingFactorySingleton();
}
return(_instance);
}