class VerbsDataInterface(object):
  """
  Interface that represents all data store interactions required by the registry's custom HTTP
  verbs.
  """
  @classmethod
  def repository_is_public(cls, namespace_name, repo_name):
    """
    Returns a boolean for whether the repository with the given name and namespace is public.
    """
    raise NotImplementedError()


class PreOCIModel(VerbsDataInterface):
  """
  PreOCIModel implements the data model for the registry's custom HTTP verbs using a database schema
  before it was changed to support the OCI specification.
  """