Batch Nickname updates in MUC


I am trying to find a way that I can use the Smack API to force users to have a particular Nickname within an existing MultiUserChat. Does anyone know if this is possible? And if so, how best to go about doing it?

The forum already exisits and has some members and some observors, but I need to find a universal way to update all Nicknames in one batch.

Many thanks,