[rules-users] How to use contains with a function

Hi all, I encountered the following issue: As an example TaskConectxt() holds a list of time related objects called times. I would like to write a rule which ideally would filter the TaskContext according to a specific time object. The problematic restriction is that this time object is derived using a helper function (imported), in this case called getTimeByID which received as input an enum ID of a time and returns the desired time object. Ideally the rule would like something like this: rule "verify time" when $tc: TaskContext(times contains getTimeByID(ETimeID.NOW)) then //something end unfortunately this does not work. Is there any way to call a function with a param? Is there a better alternative method than this one? Thanks, Hezi