2021.11.21_02.패턴적용하기.md

2021.11.21_02.패턴적용하기

원래 클라이언트 코드

WhiteshipFactory.java

public class WhiteshipFactory extends DefaultShipFactory{

    public Ship createShip(){
        Ship ship = new Whiteship();
        ship.setAnchor(new WhiteAnchor());
        ship.setWhell(new WhiteWheel());
        return ship;
    }
}

• 지금 구체화되어 있는데 인터페이스 생성하자

ShipPartsFactory.java

public interface ShipPartsFactory {
    Anchor createAnchor();

    Wheel createWheel();
}

• 이게 추상 팩토리

WhiteahipFactory.java

public class WhiteshipFactory extends DefaultShipFactory{

    public Ship createShip(){
        Ship ship = new Whiteship();
        ship.setAnchor(new WhiteAnchor());
        ship.setWhell(new WhiteWheel());
        return ship;
    }

}

WhiteshipPartsFactory.java

public class WhiteshipPartsFactory implements ShipPartsFactory{
    @Override
    public Anchor createAnchor() {
        return new WhiteAnchor();
    }

    @Override
    public Wheel createWheel(){
        return new WhiteWheel();
    }

}

Anchor 관련 인터페이스

public interface Anchor {
}

///
public class WhiteAnchor implements Anchor {

}

Wheel 관련 인터페이스

public interface Wheel {
}

///
public class WhiteWheel implements Wheel{
}

적용하기

WhiteshipFactory | before

public class WhiteshipFactory extends DefaultShipFactory{

    public Ship createShip(){
        @Override
        Ship ship = new Whiteship();
        ship.setAnchor(new WhiteAnchor());
        ship.setWhell(new WhiteWheel());
        return ship;
    }

}

WhiteshipFactory | after

public class WhiteshipFactory extends DefaultShipFactory{

    private  ShipPartsFactory shipPartsFactory;

    public WhiteshipFactory(ShipPartsFactory shipPartsFactory){
        this.shipPartsFactory = shipPartsFactory;
    }
    @Override
    public Ship createShip(){
        Ship ship = new Whiteship();
        ship.setAnchor(shipPartsFactory.createAnchor());
        ship.setWhell(shipPartsFactory.createWheel());
        return ship;
    }

}

Ship.java | before

public class Ship {

    private String name;

    private String color;

    private String logo;

    private Wheel wheel;

    private Anchor anchor;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getLogo() {
        return logo;
    }

    public void setLogo(String logo) {
        this.logo = logo;
    }

    @Override
    public String toString() {
        return "Ship{" +
                "name='" + name + '\'' +
                ", color='" + color + '\'' +
                ", logo='" + logo + '\'' +
                '}';
    }

    public void setAnchor(WhiteAnchor anchor) {
    }
    public void setWheel(WhiteWheel wheel) {
    }
}

• 이전은 구체적인 클래스여서 저렇게 되어있었지만

Ship.java | after

public class Ship {

    private String name;

    private String color;

    private String logo;

    private Wheel wheel;

    private Anchor anchor;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getLogo() {
        return logo;
    }

    public void setLogo(String logo) {
        this.logo = logo;
    }

    @Override
    public String toString() {
        return "Ship{" +
                "name='" + name + '\'' +
                ", color='" + color + '\'' +
                ", logo='" + logo + '\'' +
                '}';
    }

    public void setAnchor(Anchor anchor) {
    }
    public void setWheel(Wheel wheel) {
    }
}

WhiteAnchorPro 추가

• public class WhitePartsProFactory implements ShipPartsFactory{
      @Override
      public Anchor createAnchor() {
          return new WhiteAnchorPro();
      }
  
      @Override
      public Wheel createWheel() {
          return  new WhiteWheelPro();
      }
  }

• public class WhiteAnchorPro implements Anchor{
  
  }

• public class WhiteWheelPro implements Wheel{
  }

  • 위와 같이 준비를 해주면 이제 pro를 추가할 수 있는것

Ship.java 수정

public class Ship {

    private String name;

    private String color;

    private String logo;

    private Wheel wheel;

    private Anchor anchor;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getLogo() {
        return logo;
    }

    public void setLogo(String logo) {
        this.logo = logo;
    }

    @Override
    public String toString() {
        return "Ship{" +
                "name='" + name + '\'' +
                ", color='" + color + '\'' +
                ", logo='" + logo + '\'' +
                '}';
    }

    public Wheel getWheel() {
        return wheel;
    }

    public Anchor getAnchor() {
        return anchor;
    }
}

ShipInventory.java

public class ShipInventory {
    public static void main(String[] args){
        ShipFactory shipFactory = new WhiteshipFactory(new WhitePartsProFactory());
        Ship ship = shipFactory.createShip();
        System.out.println(ship.getAnchor().getClass());
        System.out.println(ship.getWheel().getClass());
    }
}

ShipFactory shipFactory = new WhiteshipFactory(new WhitePartsProFactory());

ShipFactory shipFactory = new WhiteshipFactory(new WhitePartsFactory());

• 제품군에 팩토리에 따라서 달라지는거지 팩토리 자체를 바꾸는것이 아니기 때문에 더 좋아진것
• 단일 책임원칙을 지켰고, 여러 가지 제품군 만들기 때문에 이거 지키지 않은것 아니냐 할 수 있긴함
• 개방 폐쇄 원칙을 지켰다고 볼 수 있음