private void CheckRoster()
{
SortedDictionary <string, TreeNode> Contacts = this.children;
Dictionary <string, TreeNode> Existing = new Dictionary <string, TreeNode>();
LinkedList <TreeNode> Added = null;
LinkedList <KeyValuePair <string, TreeNode> > Removed = null;
LinkedList <RosterItem> Resubscribe = null;
LinkedList <RosterItem> Reunsubscribe = null;
if (Contacts == null)
{
Contacts = new SortedDictionary <string, TreeNode>();
}
lock (Contacts)
{
foreach (RosterItem Item in this.client.Roster)
{
if (Contacts.TryGetValue(Item.BareJid, out TreeNode Contact))
{
Existing[Item.BareJid] = Contact;
}
else
{
if (Item.IsInGroup(ConcentratorGroupName))
{
Contact = new XmppConcentrator(this, this.client, Item.BareJid, Item.IsInGroup(EventsGroupName));
}
else if (Item.IsInGroup(ActuatorGroupName))
{
Contact = new XmppActuator(this, this.client, Item.BareJid, Item.IsInGroup(SensorGroupName), Item.IsInGroup(EventsGroupName));
}
else if (Item.IsInGroup(SensorGroupName))
{
Contact = new XmppSensor(this, this.client, Item.BareJid, Item.IsInGroup(EventsGroupName));
}
else if (Item.IsInGroup(OtherGroupName))
{
Contact = new XmppOther(this, this.client, Item.BareJid);
}
else
{
Contact = new XmppContact(this, this.client, Item.BareJid);
}
Contacts[Item.BareJid] = Contact;
if (Added == null)
{
Added = new LinkedList <TreeNode>();
}
Added.AddLast(Contact);
}
switch (Item.PendingSubscription)
{
case PendingSubscription.Subscribe:
if (Resubscribe == null)
{
Resubscribe = new LinkedList <RosterItem>();
}
Resubscribe.AddLast(Item);
break;
case PendingSubscription.Unsubscribe:
if (Reunsubscribe == null)
{
Reunsubscribe = new LinkedList <RosterItem>();
}
Reunsubscribe.AddLast(Item);
break;
}
}
if (this.children == null)
{
this.children = Contacts;
}
else
{
foreach (KeyValuePair <string, TreeNode> P in this.children)
{
if (P.Value is XmppContact Contact &&
!Existing.ContainsKey(Contact.BareJID))
{
if (Removed == null)
{
Removed = new LinkedList <KeyValuePair <string, TreeNode> >();
}
Removed.AddLast(P);
}
}
if (Removed != null)
{
foreach (KeyValuePair <string, TreeNode> P in Removed)
{
this.children.Remove(P.Key);
}
}
}
}
if (Added != null)
{
foreach (TreeNode Node in Added)
{
this.connections.Owner.MainView.NodeAdded(this, Node);
}
}
if (Removed != null)
{
foreach (KeyValuePair <string, TreeNode> P in Removed)
{
this.connections.Owner.MainView.NodeRemoved(this, P.Value);
}
}
if (Resubscribe != null)
{
foreach (RosterItem Item in Resubscribe)
{
this.client.RequestPresenceSubscription(Item.BareJid);
}
}
if (Reunsubscribe != null)
{
foreach (RosterItem Item in Reunsubscribe)
{
this.client.RequestPresenceUnsubscription(Item.BareJid);
}
}
this.OnUpdated();
}