ValidatorFactory.java

@Component
@AllArgsConstructor(onConstructor = @__(@Autowired))
public class ValidatorFactory {
    // All concrete classes of an interface can be asserted like this in Spring.
    // If you want to know more, see: https://dzone.com/articles/load-all-implementors
    private List<BaseValidator> validators;

    /**
     * Filter out all unnecessary validation classes by checking event types
     * and returns only needed ones.
     * 
     * @param isExclusive: the boolean value indicate whether the event is the exclusive one or not
     * @return All necessary validation methods
     */
    List<BaseValidator> get(boolean isExclusive) {
        EnumSet<ValidateType> eventTypes = ValidateType.getEventTypes(isExclusive);
        return validators.stream().filter(v -> eventTypes.contains(v.getValidateType())).collect(Collectors.toList());
    }
}