push the logic that is still necessary down into the subclasses

Change-Id: I99424f0b3c654c5652991a4140b17ceb02224e50
Reviewed-on: https://gerrit.libreoffice.org/49087Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>