[Ant-user] Selecting the largest or oldest files in a directory

Is there a way to select the "n" largest files or the n oldest files in a
directory?
Looking through all the standard
Selectors<http://ant.apache.org/manual/Types/selectors.html>I can't
see a way to do this. Is there some "ant-contrib"-y place I could
find a custom selector that does something like this? Or do I need to
write my own?

Thanks,

Harold