code: public List<MessageOrOmemoMessage> decryptMamQueryResult(MamManager.MamQuery mamQuery)
              throws SmackException.NotLoggedInException {
          return new ArrayList<>(getOmemoService().decryptMamQueryResult(new LoggedInOmemoManager(this), mamQuery));
      }
docs: Decrypt messages from a MAM query.
  
  @param mamQuery The MAM query
  @return list of decrypted OmemoMessages
  @throws SmackException.NotLoggedInException if the Manager is not authenticated.