code: protected String getAuthenticationContextByAssertion(final Object assertion,
                                                           final RequestedAuthnContext requestedAuthnContext,
                                                           final List<AuthnContextClassRef> authnContextClassRefs) {
          LOGGER.debug("AuthN Context comparison is requested to use [{}]", requestedAuthnContext.getComparison());
          authnContextClassRefs.forEach(c -> LOGGER.debug("Requested AuthN Context [{}]", c.getAuthnContextClassRef()));
          return null;
      }
docs: Gets authentication context by assertion.
  This is more of a template method for the time being,
  and may be enhanced later to support more advanced parsing of classes
  from the assertion.
  
  @param assertion             the assertion
  @param requestedAuthnContext the requested authn context
  @param authnContextClassRefs the authn context class refs
  @return the authentication context by assertion