def _checkParams( self, params ):
     from copy import copy
     self._params = copy(params)
     RH._checkParams( self, params )
     self._addURL = ""
     if self._params.has_key( "addURL" ):
         self._addURL = self._params["addURL"]
         del self._params["addURL"]
     self._identityList = self._normaliseListParam(self._params.get("selectedPrincipals",[]))
     if self._params.has_key("selectedPrincipals"):
         del self._params["selectedPrincipals"]

 def _process(self):
     # ConferenceModifBase overrides this with functionality that
     # doesn't even belong in there...
     return RH._process(self)

 def __init__(self):
     RH.__init__(self)
     self._wf = ""

 def _checkParams(self, params):
     RH._checkParams(self, params)
     self.attachment = Attachment.find_one(id=request.view_args['attachment_id'], is_deleted=False)

 def _checkProtection(self):
     RH._checkProtection(self)
     if not self.attachment.can_access(session.user):
         raise Forbidden

 def __init__( self, req ):
     RH.__init__( self, req )
     self._wf = ""

 def __init__(self, req=None):
     RH.__init__(self)
     self._wf = ""