class AuthorizationGrantFileDAOImpl implements AuthorizationGrantDAO {

   @Override
   public List<AuthorizationGrant> findForEntity(UUID entityId) {
      Map<UUID, AuthorizationGrant> placeGrants = grants.get(entityId);
      return placeGrants == null
            ? Collections.<AuthorizationGrant>emptyList()
            : placeGrants.values().stream().collect(Collectors.toList());
   }

   public  AuthorizationGrantFileDAOImpl();

}