Provision to add the options for update modes in Generic Extraction FM Code

Hi Experts ,

I would like to know is there any provision to add the various options for update modes which can be when update mode equals 'Delta' , 'Full' ,'Reapir Full'.

By this i mean to say that when info package with update mode as full is run then it extracts all the records .Similarly when ran with delta only extracts the Chnaged/New records.

Please suggest how to get the same done in the Function module code in the Generic Extractor.

Thanks

Kamal