jabber.connection.PubSubNode.GotSubscribed C# (CSharp) Method

        private void GotSubscribed(object sender, IQ iq, object state)
        {
            if (iq.Type != IQType.result)
            {
                FireError(Op.SUBSCRIBE, "Subscription failed", iq);
                return;
            }

            PubSub ps = iq.Query as PubSub;
            if (ps == null)
            {
                FireError(Op.SUBSCRIBE, "Invalid protocol", iq);
                return;
            }

            PubSubSubscriptionType subType;
            PubSubSubscription sub = ps["subscription", URI.PUBSUB] as PubSubSubscription;
            if (sub != null)
                subType = sub.Type;
            else
            {
                XmlElement ent = ps["entity", URI.PUBSUB];
                if (ent == null)
                {
                    FireError(Op.SUBSCRIBE, "Invalid protocol", iq);
                    return;
                }
                string s = ent.GetAttribute("subscription");
                if (s == "")
                    subType = PubSubSubscriptionType.NONE_SPECIFIED;
                else
                    subType = (PubSubSubscriptionType)Enum.Parse(typeof(PubSubSubscriptionType), s);
            }

            switch (subType)
            {
            case PubSubSubscriptionType.NONE_SPECIFIED:
            case PubSubSubscriptionType.subscribed:
                break;
            case PubSubSubscriptionType.pending:
                FireError(Op.SUBSCRIBE, "Subscription pending authorization", iq);
                return;
            case PubSubSubscriptionType.unconfigured:
                FireError(Op.SUBSCRIBE, "Subscription configuration required.  Not implemented yet.", iq);
                return;
            }

            this[Op.SUBSCRIBE] = STATE.Running;
            GetItemsIfPending();
        }