String string,
            String sourceHint,
            InputLocationTracker tracker,
            String... validValues) {
        if (string == null || string.isEmpty()) {
            return true;
        }

        List<String> values = Arrays.asList(validValues);

        if (values.contains(string)) {
            return true;
        }

        addViolation(

            String string,
            String sourceHint,
            InputLocationTracker tracker,
            String... validValues) {
        if (string == null || string.isEmpty()) {
            return true;
        }

        List<String> values = Arrays.asList(validValues);

        if (values.contains(string)) {
            return true;
        }

        addViolation(

		break
	case "":
		allErrs = append(allErrs, field.Required(fldPath, ""))
	default:
		validValues := []batch.ConcurrencyPolicy{batch.AllowConcurrent, batch.ForbidConcurrent, batch.ReplaceConcurrent}
		allErrs = append(allErrs, field.NotSupported(fldPath, *concurrencyPolicy, validValues))
	}

	return allErrs
}