'Get mapping based on idp_id and protocol_id.
:param idp_id: id of the identity provider
:type idp_id: string
:param protocol_id: id of the protocol
:type protocol_id: string
:raises keystone.exception.IdentityProviderNotFound: If the IdP
doesn\'t exist.
:raises keystone.exception.FederatedProtocolNotFound: If the federated
protocol cannot be found.
:returns: mapping ref
:rtype: dict'

@abc.abstractmethod
def get_mapping_from_idp_and_protocol(self, idp_id, protocol_id):

    raise exception.NotImplemented()
