Conditional processing based upon published parameter on dataset level (not for each feature seperately)

My workspace has a published parameter `area` which can have the values `country` or `province`. It also contains a SpatialFilter transformer that only needs to be executed if `area = province`. How do I evaluate whether this condition is met only once for the entire dataset? Because I have hundreds of thousands of features, I don't want to evaluate the condition for each feature seperately. I would like to do conditional processing on the *dataset* level in stead of the feature level, so Tester and TestFilter are probably not the solutions I'm looking for.