/**
* Registers the specified billing observer.
*
* @param observer
* the billing observer to add.
* @return true if the observer wasn't previously registered, false
* otherwise.
* @see #unregisterObserver(IBillingObserver)
*/
public static bool registerObserver(IBillingObserver observer)
{
if (observers.Contains(observer))
{
return(true);
}
else
{
observers.Add(observer);
return(false);
}
}
/**
* Unregisters the specified billing observer.
*
* @param observer
* the billing observer to unregister.
* @return true if the billing observer was unregistered, false otherwise.
* @see #registerObserver(IBillingObserver)
*/
public static bool unregisterObserver(IBillingObserver observer)
{
return(observers.Remove(observer));
}
