BumpeiShimada

package main

import (
	"fmt"
	"time"
)

func main() {
	now := time.Now()

BumpeiShimada

const lines = tweet.split("\\n").map(function(line) {
  return <p className="line-wrap">{line}</p>;
});

BumpeiShimada

public class LoginLogic {
   
    // ...

    /**
     * @return whether current date is after or equal to graduate year's 1st April
     * NOTE FOR READERS: In Japan, students commonly graduates at the end of March
     */
    boolean isAfterServiceGraduateDate() {
        // Let's create a test before implementation!!

BumpeiShimada

class LoginLogicUnitTest extends Specification {

  private CandidateLoginLogic logic

  def setup(){
    logic = new CandidateLoginLogic()
    
    // Mocking autowired methods
    OriginalTimeManager timeManager = Mock()
    logic.metaClass.setAttribute(logic, "timeManager", timeManager)

BumpeiShimada

public class LoginLogic {

   @Autowired
   private OriginalTimeManager timeManager; // This is an in-house class for managing data related to dates
  
   /**
    * @param graduateYear
    * @return whether current date is after or equal to graduate year's 1st April
    * @throws NullPointerException if the param graduateYear is null
    */

BumpeiShimada

@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() {

BumpeiShimada

@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.

BumpeiShimada

@Service
@AllArgsConstructor(onConstructor = @__(@Autowired))
public class ValidationService {
    private ValidatorFactory factory;

    public void execute(boolean isExclusive, EventForm form, List<String> errors) {
        List<BaseValidator> validators = factory.get(isExclusive);
        validators.forEach(validator -> {
            validator.validate(form, errors);
        });

BumpeiShimada

/**
 * Types for categorizing validation classes
 */
enum ValidateType {

    /**
     * Applicable to all events
     */
    ALL_EVENTS,

BumpeiShimada

/**
 * The base class for validating EventForm data
 */
public interface BaseValidator {

    // Argument "errors" should be replaced with error handling class.
    // In actual case, when "errors" are not empty a program detect it and understand that there are errors.
    void validate(EventForm form, List<String> errors);

    ValidateType getValidateType();