javadev / pt-backend

class CertificateValidator implements Validator {

    private static final Pattern CERTIFICATE_PATTERN = Pattern.compile("^[A-Z]{4}[0-9]{4}$");

    @Override

    public boolean supports(final Class<?> aClass) {

        return String.class.equals(aClass);

    }

    @Override

    public void validate(final Object obj, final Errors errors) {

        final String certificate = (String) obj;

        if (certificate == null || certificate.trim().isEmpty()) {

            errors.reject("certificate", "Invalid empty certificate");

            return;

        }

        final Matcher matcher = CERTIFICATE_PATTERN.matcher(certificate);

        if (!matcher.matches()) {

            errors.reject("certificate", "Invalid certificate code (" + certificate + ")");