[Geotools-gt2-users] Adding two attributes to a FeatureType / FeatureCollection

[Matthias L. <mat...@gf...>]

Hi,

I have a FeatureCollection containing some hundred features and I want 
to add two attributes to each Feature. The two attributes are 
generated/calculated for each Feature on the basis of the Feature's 
geometry and other (application internal) values. All other attributes 
of the Feature are not used for this calculation but must be part of the 
resulting Features. And they are not known since I'm developing a more 
or less generic (GeoTools-) Process for this task.

This means I have to change the FeatureType but AFAIK the FeatureType is 
immutable. What is the best/most efficient way to realize the addition 
of two new attributes?
- create a new FeatureType,
- iterate over the given (old) FeatureType and copying all the 
attributes into the new one (I think I don't have to iterate, I can copy 
them in one bunch)
- add my two additional attributes
- copying each Feature into a new one Feature (with all it's attributes)
- set my calculated attributes

I'm no expert in the GeoTools library: are there any 
Factories/Helper/Convenience classes that could support me? Maybe I'm on 
the wrong track and all the steps above can be skipped with just one 
mysterious command.

Thank you!

Matthias