Detecting if a civ has a wonder

Does anyone know of how to check to see if a civ has a specific wonder? I want to modify Final Frontier so that if a civ has a certain wonder (anywhere in the civ) then a city hit by a Doomsday Weapon won't lose the best planet (this is done via onNukeExplosion in python).

The quickest way is probably via CyPlayer.getBuildingClassCount. Pass it the building class of the wonder and if it comes back as 1 (or just >0) then they must have built one somewhere.

Thanks, it works!