public Optional<TrxSuratTugasKeluar> findByBk(final Transaction transaction, final String trxNumber, final Date trxDate) {
    try {
      StringBuilder queryStringBuilder = new StringBuilder();
      queryStringBuilder.append("from TrxSuratTugasKeluar \n");
      queryStringBuilder.append("where \n");
      queryStringBuilder.append("((:transactionId is null and transaction is null) or transaction.id = :transactionId) and ");
      queryStringBuilder.append("((:trxNumber is null and trxNumber is null) or trxNumber = :trxNumber) and ");
      queryStringBuilder.append("((:trxDate is null and trxDate is null) or trxDate = :trxDate)");

      TypedQuery<TrxSuratTugasKeluar> typedQuery = em.createQuery(queryStringBuilder.toString(), TrxSuratTugasKeluar.class);
      typedQuery.setParameter("transactionId", transaction.getId());
      typedQuery.setParameter("trxNumber", trxNumber);
      typedQuery.setParameter("trxDate", trxDate);

      return Optional.ofNullable(typedQuery.getSingleResult());
    } catch (final NoResultException e) {
      return Optional.empty();
    }
}