def get_room_jid(self,nick=None):
if nick is None:<EOL><INDENT>return self.room_jid<EOL><DEDENT>return JID(self.room_jid.node,self.room_jid.domain,nick)<EOL>
Get own room JID or a room JID for given `nick`.

:Parameters:
    - `nick`: a nick for which the room JID is requested.
:Types:
    - `nick`: `unicode`

:return: the room JID.
:returntype: `JID`