EmailAddress.java

package dev.cherifbouchelaghem.vodto.model;

// INSIED THE HEXAGON
public record EmailAddress(String address) {

    public static EmailAddress fromString(String address) {
        return new EmailAddress(address);
    }
}

FullName.java

package dev.cherifbouchelaghem.vodto.model;

// INSIDE THE HEXAGON
public record FullName (String fistname, String lastname){
    static public FullName of (String firstname, String lastname) {
        return new FullName(firstname, lastname);
    }
}

InMemoryUsers.java

package dev.cherifbouchelaghem.vodto.infrastructure.persistence;

import dev.cherifbouchelaghem.vodto.model.User;
import dev.cherifbouchelaghem.vodto.model.Users;

import java.util.ArrayList;
import java.util.List;

// === OUTSIDE THE HEXAGON ===//

/**
 * PERSISTENCE ADAPTER
 */
public class InMemoryUsers implements Users {
    private List<User> users = new ArrayList<>();
    @Override
    public void add(User user) {
        this.users.add(user);
    }
}

RegistationCommand.java

package dev.cherifbouchelaghem.vodto.application;

import dev.cherifbouchelaghem.vodto.model.EmailAddress;
import dev.cherifbouchelaghem.vodto.model.FullName;

// ===== INSIDE THE HAXGON ============ //

/**
 * The message/request to the hexagon
 */
public class RegistrationCommand {
    private String firstname;
    private String lastname;
    private String emailAddress;

    public RegistrationCommand(String firstname, String lastname, String emailAddress) {
        this.firstname = firstname;
        this.lastname = lastname;
        this.emailAddress = emailAddress;
    }

    public EmailAddress getEmailAddress() {
        return EmailAddress.fromString(emailAddress);
    }

    public FullName getFullName() {
        return FullName.of(this.firstname, this.lastname);
    }
}

User.java

package dev.cherifbouchelaghem.vodto.model;

// INSIDE THE HEXAGON
public class User {
    private FullName fullName;
    private EmailAddress emailAddress;


    public User(FullName fullName, EmailAddress emailAddress) {
        this.fullName = fullName;
        this.emailAddress = emailAddress;
    }

    public static User register(FullName fullName, EmailAddress emailAddress) {
        return new User(fullName, emailAddress);
    }

    public String firstname() {
        return this.fullName.fistname();
    }


    public String lastname() {
        return this.fullName.lastname();
    }

    public String emailAddress() {
        return this.emailAddress.address();
    }
}

UserResource.java

package dev.cherifbouchelaghem.vodto.infrastructure.resource;

import dev.cherifbouchelaghem.vodto.application.RegistrationCommand;
import dev.cherifbouchelaghem.vodto.application.UserService;
import dev.cherifbouchelaghem.vodto.application.UserView;

// === OUTSIDE THE HEXAGON ===//

/**
 * HTTP ADAPTER
 */
public class UserResource {
    private UserService userService;

    public UserResource(UserService userService) {
        this.userService = userService;
    }

    public Response post(String firstname, String lastname, String emailAddress) {
        UserView user = userService.register(new RegistrationCommand(firstname, lastname, emailAddress));
        return Response.created(user);
    }
}

Users.java

package dev.cherifbouchelaghem.vodto.model;

// INSIDE THE HEXAGON

/**
 * Persistence PORT
 */
public interface Users {
    void add(User user);
}

UserService.java

package dev.cherifbouchelaghem.vodto.application;

import dev.cherifbouchelaghem.vodto.model.User;
import dev.cherifbouchelaghem.vodto.model.Users;

// ===== INSIDE THE HAXGON ============ //

/**
 * The haxgon entry point
 * The hexagon PUBLIC API
 */
public class UserService {
    private Users users;

    public UserService(Users users) {
        this.users = users;
    }

    public UserView register(RegistrationCommand command) {
        User user = User.register(command.getFullName(), command.getEmailAddress());
        users.add(user);
        return UserView.fromUser(user);
    }
}

UserView.java

package dev.cherifbouchelaghem.vodto.application;

import dev.cherifbouchelaghem.vodto.model.User;

// ======= INSIDE THE HEXAGON ===== //

/**
 * the hexgon response
 * @param firstname
 * @param lastname
 * @param emailAddress
 */
public record UserView(String firstname, String lastname, String emailAddress) {
    static public UserView fromUser(User user) {
        return new UserView(user.firstname(), user.lastname(), user.emailAddress());
    }
}