public void AddObserver(FriendObserver observer)
{
if (observer == null)
{
return;
}
Observers.Add(observer);
}
public void RemoveObserver(FriendObserver observer)
{
if (observer == null)
{
return;
}
Observers.Remove(observer);
}
public void AddParticularFriendObserver(Guid buddy_id, FriendObserver observer)
{
if (buddy_id != Guid.Empty && observer != null)
{
if (ParticularFriendObserverMap.ContainsKey(buddy_id) == false)
{
ParticularFriendObserverMap[buddy_id] = new HashSet <FriendObserver>();
}
ParticularFriendObserverMap[buddy_id].Add(observer);
}
}
public void RemoveParticularFriendObserver(Guid buddy_id, FriendObserver observer)
{
if (buddy_id == Guid.Empty || observer == null)
{
return;
}
if (ParticularFriendObserverMap.ContainsKey(buddy_id) == false)
{
return;
}
ParticularFriendObserverMap[buddy_id].Remove(observer);
// purge empty sets from the map
if (ParticularFriendObserverMap[buddy_id].Count == 0)
{
ParticularFriendObserverMap.Remove(buddy_id);
}
}