private void process(Presence presence) {
if (presence.getType() == Presence.Type.unavailable) {
MUCRole mucRole = room.getOccupantByFullJID(realjid);
if (mucRole != null) {
room.leaveRoom(mucRole);
}
} else {
throw new UnsupportedOperationException(
"Cannot process Presence packets of remote users: " + presence);
}
}