def _addObjects(self, obj):
"""
Adds any objects that are specified by the featurelet's info.
First checks for a previous installation of this featurelet,
skips anything that was previously installed.
Raises an error if content of the same id that was NOT a part
of a previous installation of this featurelet exists.
"""
info = self._info
supporter = IFeatureletSupporter(obj)
objmgr = IObjectManager(obj)
prior_ids = tuple()
prior_info = supporter.getFeatureletDescriptor(self.id)
if prior_info is not None:
prior_content = prior_info.get('objects', tuple())
prior_ids = [item['id'] for item in prior_content]
for item in info.get('objects', tuple()):
iid = item['id']
if iid not in prior_ids:
if objmgr.hasObject(iid):
msg = "Object with id '%s' already exists." % iid
raise zExceptions.BadRequest, msg
try:
newobj = item['class']()
except TypeError:
# might need an id passed to the constructor
newobj = item['class'](iid)
objmgr._setOb(iid, newobj)
def _removeObjects(self, obj, prior_info, info_key):
"""
Removes any objects that were added to the supporter as a
result of a prior installation of this featurelet. Will not
touch any objects that were not installed by this featurelet.
"""
prior_objects = prior_info.get(info_key)
if prior_objects is None:
return
objmgr = IObjectManager(obj)
prior_ids = [item['id'] for item in prior_objects]
del_ids = [id_ for id_ in prior_ids if objmgr.hasObject(id_)]
if del_ids:
objmgr.manage_delObjects(ids=del_ids)
