2단계 - 리팩터링(메뉴)

src/main/java/kitchenpos/common/price/Price.java

@@ -8,7 +8,7 @@
  *   <li>가격은 음수일 수 없다.</li>
  * </ul>
  */
-public class Price {
+public class Price implements Comparable<Price> {
 
     public final BigDecimal value;
 
@@ -30,6 +30,23 @@ public Price(double value) {
         this(BigDecimal.valueOf(value));
     }
 
+    public Price add(Price augend) {
+        return new Price(this.value.add(augend.value));
+    }
+
+    public Price multiply(BigDecimal multiplicand) {
+        return new Price(this.value.multiply(multiplicand));
+    }
+
+    public Price multiply(long multiplicand) {
+        return this.multiply(BigDecimal.valueOf(multiplicand));
+    }
+
+    @Override
+    public int compareTo(Price o) {
+        return this.value.compareTo(o.value);
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {

src/main/java/kitchenpos/menu/tobe/domain/entity/Menu.java

@@ -0,0 +1,71 @@
+package kitchenpos.menu.tobe.domain.entity;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.UUID;
+import kitchenpos.common.name.Name;
+import kitchenpos.common.price.Price;
+import kitchenpos.menu.tobe.domain.service.MenuDisplayPolicy;
+import kitchenpos.menu.tobe.domain.vo.MenuGroup;
+import kitchenpos.menu.tobe.domain.vo.MenuProduct;
+
+public class Menu {
+
+    public final UUID id;
+
+    public final Name name;
+
+    public final MenuGroup menuGroup;
+
+    private final List<MenuProduct> menuProducts;
+
+    private Boolean displayed;
+
+    private Price price;
+
+    public Menu(
+        final UUID id,
+        final Name name,
+        final Boolean displayed,
+        final Price price,
+        final MenuGroup menuGroup,
+        final List<MenuProduct> menuProducts
+    ) {
+        this.id = id;
+        this.name = name;
+        this.displayed = displayed;
+        this.price = price;
+        this.menuGroup = menuGroup;
+        this.menuProducts = menuProducts;
+    }
+
+    public boolean displayed() {
+        return this.displayed;
+    }
+
+    public Price price() {
+        return this.price;
+    }
+
+    public List<MenuProduct> menuProducts() {
+        return Collections.unmodifiableList(this.menuProducts);
+    }
+
+    public void display() {
+        if (!MenuDisplayPolicy.isDisplayable(this)) {
+            throw new IllegalStateException("메뉴 노출 정책에 따라 이 메뉴를 노출할 수 없습니다");
+        }
+        this.displayed = true;
+    }
+
+    public void hide() {
+        this.displayed = false;
+    }
+
+    public void setPrice(final Price price) {
+        if (!MenuDisplayPolicy.isDisplayable(this)) {
+            this.hide();
+        }
+        this.price = price;
+    }
+}

src/main/java/kitchenpos/menu/tobe/domain/entity/MenuGroup.java

@@ -0,0 +1,16 @@
+package kitchenpos.menu.tobe.domain.entity;
+
+import java.util.UUID;
+import kitchenpos.common.name.Name;
+
+public class MenuGroup {
+
+    public final UUID id;
+
+    public final Name name;
+
+    public MenuGroup(final UUID id, final Name name) {
+        this.id = id;
+        this.name = name;
+    }
+}

src/main/java/kitchenpos/menu/tobe/domain/repository/MenuGroupRepository.java

@@ -0,0 +1,15 @@
+package kitchenpos.menu.tobe.domain.repository;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+import kitchenpos.menu.tobe.domain.entity.MenuGroup;
+
+public interface MenuGroupRepository {
+
+    MenuGroup save(MenuGroup menuGroup);
+
+    Optional<MenuGroup> findById(UUID id);
+
+    List<MenuGroup> findAll();
+}

src/main/java/kitchenpos/menu/tobe/domain/repository/MenuRepository.java

@@ -0,0 +1,21 @@
+package kitchenpos.menu.tobe.domain.repository;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+import kitchenpos.menu.tobe.domain.entity.Menu;
+
+public interface MenuRepository {
+
+    Menu save(final Menu menu);
+
+    Optional<Menu> findById(final UUID id);
+
+    List<Menu> findAll();
+
+    List<Menu> findAllByIdIn(final List<UUID> ids);
+
+    List<Menu> findAllByProductId(final UUID productId);
+}
+
+

src/main/java/kitchenpos/menu/tobe/domain/service/MenuDisplayPolicy.java

@@ -0,0 +1,22 @@
+package kitchenpos.menu.tobe.domain.service;
+
+
+import kitchenpos.common.price.Price;
+import kitchenpos.menu.tobe.domain.entity.Menu;
+import kitchenpos.menu.tobe.domain.vo.MenuProduct;
+import org.springframework.stereotype.Service;
+
+@Service
+public class MenuDisplayPolicy {
+
+    private MenuDisplayPolicy() {
+    }
+
+    public static boolean isDisplayable(final Menu menu) {
+        final Price total = menu.menuProducts()
+            .stream()
+            .map(MenuProduct::subtotal)
+            .reduce(new Price(0), Price::add);
+        return menu.price().compareTo(total) <= 0;
+    }
+}

src/main/java/kitchenpos/menu/tobe/domain/vo/MenuGroup.java

@@ -0,0 +1,31 @@
+package kitchenpos.menu.tobe.domain.vo;
+
+import kitchenpos.common.name.Name;
+
+public class MenuGroup {
+
+    public final Name name;
+
+    public MenuGroup(final Name name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        MenuGroup menuGroup = (MenuGroup) o;
+
+        return name.equals(menuGroup.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+}

src/main/java/kitchenpos/menu/tobe/domain/vo/MenuProduct.java

@@ -0,0 +1,55 @@
+package kitchenpos.menu.tobe.domain.vo;
+
+import java.util.UUID;
+import kitchenpos.common.price.Price;
+
+public class MenuProduct {
+
+    public final UUID productId;
+
+    public final Price pricePerUnit;
+
+    public final MenuProductQuantity quantity;
+
+    public MenuProduct(
+        final UUID productId,
+        final Price pricePerUnit,
+        final MenuProductQuantity quantity
+    ) {
+        this.productId = productId;
+        this.pricePerUnit = pricePerUnit;
+        this.quantity = quantity;
+    }
+
+    public Price subtotal() {
+        return this.pricePerUnit.multiply(this.quantity.value);
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        MenuProduct that = (MenuProduct) o;
+
+        if (!productId.equals(that.productId)) {
+            return false;
+        }
+        if (!pricePerUnit.equals(that.pricePerUnit)) {
+            return false;
+        }
+        return quantity.equals(that.quantity);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = productId.hashCode();
+        result = 31 * result + pricePerUnit.hashCode();
+        result = 31 * result + quantity.hashCode();
+        return result;
+    }
+}

src/main/java/kitchenpos/menu/tobe/domain/vo/MenuProductQuantity.java

@@ -0,0 +1,38 @@
+package kitchenpos.menu.tobe.domain.vo;
+
+/**
+ * <h1>메뉴 상품 수량</h1>
+ * <ul>
+ *     <li>메뉴 상품별 수량은 1 이상이다.</li>
+ * </ul>
+ */
+public class MenuProductQuantity {
+
+    final long value;
+
+    public MenuProductQuantity(final long value) {
+        if (value < 1) {
+            throw new IllegalArgumentException("MenuProductQuantity는 1보다 작을 수 없습니다");
+        }
+        this.value = value;
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        MenuProductQuantity that = (MenuProductQuantity) o;
+
+        return value == that.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return (int) (value ^ (value >>> 32));
+    }
+}

src/main/java/kitchenpos/menu/tobe/infra/jpa/JpaMenuGroupDao.java

@@ -0,0 +1,9 @@
+package kitchenpos.menu.tobe.infra.jpa;
+
+import java.util.UUID;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface JpaMenuGroupDao extends JpaRepository<MenuGroupEntity, UUID> {
+}

src/main/java/kitchenpos/menu/tobe/infra/jpa/JpaMenuGroupRepository.java

@@ -0,0 +1,57 @@
+package kitchenpos.menu.tobe.infra.jpa;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.stream.Collectors;
+import kitchenpos.menu.tobe.domain.entity.MenuGroup;
+import kitchenpos.menu.tobe.domain.repository.MenuGroupRepository;
+import kitchenpos.menu.tobe.infra.jpa.MenuGroupEntityConverter.MenuGroupEntityToMenuGroupConverter;
+import kitchenpos.menu.tobe.infra.jpa.MenuGroupEntityConverter.MenuGroupToMenuGroupEntityConverter;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class JpaMenuGroupRepository implements MenuGroupRepository {
+
+    private final JpaMenuGroupDao jpaMenuGroupDao;
+
+    private final MenuGroupToMenuGroupEntityConverter menuGroupToMenuGroupEntityConverter;
+
+    private final MenuGroupEntityToMenuGroupConverter menuGroupEntityToMenuGroupConverter;
+
+    @Autowired
+    public JpaMenuGroupRepository(
+        JpaMenuGroupDao jpaMenuGroupDao,
+        MenuGroupToMenuGroupEntityConverter menuGroupToMenuGroupEntityConverter,
+        MenuGroupEntityToMenuGroupConverter menuGroupEntityToMenuGroupConverter
+    ) {
+        this.jpaMenuGroupDao = jpaMenuGroupDao;
+        this.menuGroupToMenuGroupEntityConverter = menuGroupToMenuGroupEntityConverter;
+        this.menuGroupEntityToMenuGroupConverter = menuGroupEntityToMenuGroupConverter;
+    }
+
+    @Override
+    public MenuGroup save(MenuGroup menuGroup) {
+        final MenuGroupEntity menuGroupEntity = this.menuGroupToMenuGroupEntityConverter.convert(menuGroup);
+        final MenuGroupEntity result = this.jpaMenuGroupDao.save(menuGroupEntity);
+        return this.menuGroupEntityToMenuGroupConverter.convert(result);
+    }
+
+    @Override
+    public Optional<MenuGroup> findById(UUID id) {
+        final Optional<MenuGroupEntity> result = this.jpaMenuGroupDao.findById(id);
+        if (result.isEmpty()) {
+            return Optional.empty();
+        }
+        return Optional.of(this.menuGroupEntityToMenuGroupConverter.convert(result.get()));
+    }
+
+    @Override
+    public List<MenuGroup> findAll() {
+        return this.jpaMenuGroupDao.findAll()
+            .stream()
+            .map(this.menuGroupEntityToMenuGroupConverter::convert)
+            .collect(Collectors.toUnmodifiableList());
+    }
+}

src/main/java/kitchenpos/menu/tobe/infra/jpa/MenuGroupEntity.java

@@ -0,0 +1,20 @@
+package kitchenpos.menu.tobe.infra.jpa;
+
+import java.util.UUID;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Entity
+public class MenuGroupEntity {
+
+    @Column(name = "id", columnDefinition = "binary(16)")
+    @Id
+    public UUID id;
+
+    @Column(name = "name", nullable = false)
+    public String name;
+
+    public MenuGroupEntity() {
+    }
+}