import exception

class Action:

  def __init__(self):

    self.readonly = False

  def process(self, request):

    assert False

  def propagate_exception(self, e):

    if type(e) is exception.ModelWrongData:

      raise exception.ActionError(e.messages)

    if type(e) is exception.ModelDeny:

      raise exception.HttpForbidden()

    raise e