question: public void add ( GeometryFunction func ) { functions . add ( func ) ; sortedFunctions . put ( func . getName ( ) , func ) ; categorizedFunctions . put ( func . getCategory ( ) , func . getName ( ) , func ) ; if ( hasGeometryResult ( func ) ) categorizedGeometryFunctions . put ( func . getCategory ( ) , func . getName ( ) , func ) ; }
target:  Adds a function if it does not currently exist in the registry, or replaces the existing one with the same signature.