[Geotools-gt2-users] Passing a feature to a function

[<tom...@co...>]

I'm looking for an example (or some documentation would be nice) on how to pass a feature to a function as you draw a map.   Conceptually I need to do this:

fill = createFill(myFunction(feature.attribute))

Where myFunction(feature.attribute) would go off and look up the proper fill color based on some attribute of the current feature.   (The fill color could be different for each feature, in other words).  

The trouble I'm having is that there does not seem to be any clear example or documentation about how to pass the current feature to this function - all the examples I've  found are either deprecated or don't seem to address what I need to do. 

Does anyone have an example they'd be willing to share, or a link to some documentation for Geotools 8.0-RC1?