Renfe Logic for Availability

RenfeAvailability.java

    public boolean isTariffApproved() {
        String currentTariffAvailability = tarifa.getDisponibilidad();
        if (Strings.isNullOrEmpty(currentTariffAvailability)) {
            return false;
        }

        if (HIGH_AVAILABILITY.equals(currentTariffAvailability)) {
            return true;
        }

        Integer currentTariffAvailableSeats = Ints.tryParse(currentTariffAvailability);
        if (currentTariffAvailableSeats < numberOfTravellers) {
            return false;
        }

        int minimumSeats = getMinimumSeats();
        if (currentTariffAvailableSeats >= minimumSeats) {
            return true;
        }

        String standardTariffAvailability = getStandardTariffAvailability();
        if (Strings.isNullOrEmpty(standardTariffAvailability) || HIGH_AVAILABILITY.equals(standardTariffAvailability)) {
            return true;
        }

        Integer standardTariffAvailableSeats = Ints.tryParse(currentTariffAvailability);
        return (standardTariffAvailableSeats - currentTariffAvailableSeats) > 0;
    }

The rest of the logic is ok.