Validating an email field with Vaadin 10

EmailField.java

public class EmailField extends TextField implements HasValidator<String> {

    public EmailField() {
        super("Email");
        addValueChangeListener(event -> {
            String value = getValue();
            if (value == null || value.trim().isEmpty()) {
                resetToValid();
            } else {
                ValidationResult result = getDefaultValidator().apply(value, null);
                if (result.isError()) {
                    setToInvalid(result.getErrorMessage());
                } else {
                    resetToValid();
                }
            }
        });
    }


    private void setToInvalid(String errorMessage) {
        setInvalid(true);
        setErrorMessage(errorMessage);
    }

    private void resetToValid() {
        setInvalid(false);
        setErrorMessage(null);
    }

    @Override
    public Validator<String> getDefaultValidator() {
        return new EmailValidator("Value " + getValue() + " is not an email");
    }
}