DateEmptyValidator.java

@Component
public class DateEmptyValidator implements BaseValidator {
    @Override
    public void validate(EventForm form, List<String> errors) {
        validateStartDate(form, errors);
        validateEndDate(form, errors);
    }

    @Override
    public ValidateType getValidateType() {
        return ValidateType.ALL_EVENTS;
    }

    /**
     * Ensure eventStartDate is not empty
     */
    private void validateStartDate(EventForm form, List<String> errors) {
        String formStartTm = form.getEventStartDate();
        if (formStartTm.isEmpty()) {
            errors.add("eventStartDate is empty");
        }
    }

    /**
     * Ensure eventEndDate is not empty
     */
    private void validateEndDate(EventForm form, List<String> errors) {
        String formEndTm = form.getEventEndDate();
        if (formEndTm.isEmpty()) {
            errors.add("eventEndDate is empty");
        }
    }
}