Either in ring itself (which means a change to the IRing interface) or in RingManipulator. There is such a method in o.o.c.render.generators.RingGenerator called 'ringIsAromatic'.
Oh, I just found AromaticityCalculator, and its isAromatic(IRing, IAtomContainer):boolean method....
However, that code is doing something more complex (checking for electrons and such), rather than just testing for ISAROMATIC flags. So I'm not sure now...
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