public void RemovePresence(Presence p, PresenceManager handler)
{
JID from = p.From;
string res = from.Resource;
Debug.Assert(p.Type == PresenceType.unavailable);
gen.LinkedListNode <Presence> n = Find(res);
// unavail for a resource we haven't gotten presence from.
if (n == null)
{
return;
}
gen.LinkedListNode <Presence> last = m_all.Last;
m_all.Remove(n);
if (last == n)
{
// current high-pri.
if ((m_all.Last != null) && (m_all.Last.Value.IntPriority >= 0))
{
Primary(m_all.Last.Value, handler);
}
else
{
// last non-negative presence went away
if (n.Value.IntPriority >= 0)
{
Primary(null, handler);
}
}
}
}
public void AddPresence(Presence p, PresenceManager handler)
{
JID from = p.From;
string res = from.Resource;
Debug.Assert(p.Type == PresenceType.available);
// If this is an update, remove the existing one.
// we'll add the new one back in, in the correct place.
gen.LinkedListNode <Presence> n = Find(res);
if (n != null)
{
m_all.Remove(n);
}
gen.LinkedListNode <Presence> inserted = new gen.LinkedListNode <Presence>(p);
for (n = m_all.First; n != null; n = n.Next)
{
if (p < n.Value)
{
m_all.AddBefore(n, inserted);
break;
}
}
// This is the highest one.
if (inserted.List == null)
{
m_all.AddLast(inserted);
if (p.IntPriority >= 0)
{
Primary(p, handler);
}
}
}
private void Primary(Presence p, PresenceManager handler)
{
Debug.Assert((p == null) ? true : (p.IntPriority >= 0), "Primary presence is always positive priority");
handler.FireOnPrimarySessionChange(m_jid);
}