JCA: how to find out that import parameter is structure?

Hello,

I'm using JCA to obtain import parameter of some function (com.sapportals.connector.metadata.functions.IParameter). Now, I'd like to switch program flow depend on kind of this import parameter (scalar, structure, table). Especially, I'm interested in finding out that import parameter is structure. In API I was only locate getStructure() method in IParameter. I tried to compare with null value, but it didn't solve my problem.

Best Regards,

Josef Motl