spring core : order domain(java)

spring-core/basic/src/main/java/com/example/basic/OrderApp.java

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+package com.example.basic;
+
+import com.example.basic.member.Grade;
+import com.example.basic.member.Member;
+import com.example.basic.member.MemberService;
+import com.example.basic.member.MemberServiceImpl;
+import com.example.basic.order.Order;
+import com.example.basic.order.OrderService;
+import com.example.basic.order.OrderServiceImpl;
+
+public class OrderApp {
+
+    public static void main(String[] args) {
+        MemberService memberService = new MemberServiceImpl();
+        OrderService orderService = new OrderServiceImpl();
+
+        Long memberId = 1L;
+        Member member = new Member(memberId, "memberA", Grade.VIP);
+        memberService.join(member);
+
+        Order order = orderService.createOrder(memberId, "itemA", 10000);
+
+        System.out.println("order = " + order);
+    }
+}

spring-core/basic/src/main/java/com/example/basic/discount/DiscountPolicy.java

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+package com.example.basic.discount;
+
+import com.example.basic.member.Member;
+
+public interface DiscountPolicy {
+
+    /**
+     * @return 할인 대상 금액
+     */
+    int discount(Member member, int price);
+}

spring-core/basic/src/main/java/com/example/basic/discount/FixDiscountPolicy.java

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+package com.example.basic.discount;
+
+import com.example.basic.member.Grade;
+import com.example.basic.member.Member;
+
+public class FixDiscountPolicy implements DiscountPolicy {
+
+    private final int discountFixAmount = 1000;
+
+    @Override
+    public int discount(Member member, int price) {
+        if (member.getGrade() == Grade.VIP) {
+            return discountFixAmount;
+        } else {
+            return 0;
+        }
+    }
+}

spring-core/basic/src/main/java/com/example/basic/order/Order.java

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+package com.example.basic.order;
+
+public class Order {
+
+    private Long memberId;
+    private String itemName;
+    private int itemPrice;
+    private int discountPrice;
+
+    public Order(Long memberId, String itemName, int itemPrice, int discountPrice) {
+        this.memberId = memberId;
+        this.itemName = itemName;
+        this.itemPrice = itemPrice;
+        this.discountPrice = discountPrice;
+    }
+
+    public int calculatePrice() {
+        return itemPrice - discountPrice;
+    }
+
+    @Override
+    public String toString() {
+        return "Order{" +
+                "memberId=" + memberId +
+                ", itemName='" + itemName + '\'' +
+                ", itemPrice=" + itemPrice +
+                ", discountPrice=" + discountPrice +
+                '}';
+    }
+
+    public Long getMemberId() {
+        return memberId;
+    }
+
+    public void setMemberId(Long memberId) {
+        this.memberId = memberId;
+    }
+
+    public String getItemName() {
+        return itemName;
+    }
+
+    public void setItemName(String itemName) {
+        this.itemName = itemName;
+    }
+
+    public int getItemPrice() {
+        return itemPrice;
+    }
+
+    public void setItemPrice(int itemPrice) {
+        this.itemPrice = itemPrice;
+    }
+
+    public int getDiscountPrice() {
+        return discountPrice;
+    }
+
+    public void setDiscountPrice(int discountPrice) {
+        this.discountPrice = discountPrice;
+    }
+}

spring-core/basic/src/main/java/com/example/basic/order/OrderService.java

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+package com.example.basic.order;
+
+public interface OrderService {
+
+    Order createOrder(Long memberId, String itemName, int itemPrice);
+}

spring-core/basic/src/main/java/com/example/basic/order/OrderServiceImpl.java

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+package com.example.basic.order;
+
+import com.example.basic.discount.DiscountPolicy;
+import com.example.basic.discount.FixDiscountPolicy;
+import com.example.basic.member.Member;
+import com.example.basic.member.MemberRepository;
+import com.example.basic.member.MemoryMemberRepository;
+
+public class OrderServiceImpl implements OrderService {
+
+    private final MemberRepository memberRepository = new MemoryMemberRepository();
+    private final DiscountPolicy discountPolicy = new FixDiscountPolicy();
+
+    @Override
+    public Order createOrder(Long memberId, String itemName, int itemPrice) {
+        Member member = memberRepository.findById(memberId);
+        int discountPrice = discountPolicy.discount(member, itemPrice);
+        return new Order(memberId, itemName, itemPrice, discountPrice);
+    }
+}

spring-core/basic/src/test/java/com/example/basic/order/OrderServiceTest.java

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+package com.example.basic.order;
+
+import com.example.basic.member.Grade;
+import com.example.basic.member.Member;
+import com.example.basic.member.MemberService;
+import com.example.basic.member.MemberServiceImpl;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class OrderServiceTest {
+
+    MemberService memberService = new MemberServiceImpl();
+    OrderService orderService = new OrderServiceImpl();
+
+    @Test
+    void createOrder() {
+        Long memberId = 1L;
+        Member member = new Member(memberId, "memberA", Grade.VIP);
+        memberService.join(member);
+
+        Order order = orderService.createOrder(memberId, "itemA", 10000);
+
+        Assertions.assertThat(order.getDiscountPrice()).isEqualTo(1000);
+    }
+}