feat: 아이템 카테고리 정보 REST API 구현

src/main/java/until/the/eternity/item/application/service/ItemService.java

@@ -0,0 +1,18 @@
+package until.the.eternity.item.application.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import until.the.eternity.item.interfaces.rest.dto.ItemCategoryResponse;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class ItemService {
+
+    public List<ItemCategoryResponse> findItemCategories() {
+        return ItemCategoryResponse.from();
+    }
+}

src/main/java/until/the/eternity/item/interfaces/rest/controller/ItemController.java

@@ -0,0 +1,30 @@
+package until.the.eternity.item.interfaces.rest.controller;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import until.the.eternity.common.response.ApiResponse;
+import until.the.eternity.item.application.service.ItemService;
+import until.the.eternity.item.interfaces.rest.dto.ItemCategoryResponse;
+
+import java.util.List;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/items")
+@Tag(name = "아이템 정보 API", description = "아이템 정보 API")
+public class ItemController {
+
+    private final ItemService itemService;
+
+    @GetMapping("/categories")
+    @Operation(summary = "카테고리 정보", description = "아이템 상위 카테고리, 하위 카테고리 정보 조회")
+    public ResponseEntity<ApiResponse<List<ItemCategoryResponse>>> findItemCategories() {
+        List<ItemCategoryResponse> itemCategories = itemService.findItemCategories();
+        return ResponseEntity.ok(ApiResponse.success(itemCategories));
+    }
+}

src/main/java/until/the/eternity/item/interfaces/rest/dto/ItemCategoryResponse.java

@@ -0,0 +1,28 @@
+package until.the.eternity.item.interfaces.rest.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+import until.the.eternity.common.enums.ItemCategory;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Getter
+@Builder
+public class ItemCategoryResponse {
+
+    private String subCategory;
+    private String topCategory;
+
+    public static List<ItemCategoryResponse> from() {
+        return Arrays.stream(ItemCategory.values())
+                .map(
+                        itemCategory ->
+                                ItemCategoryResponse.builder()
+                                        .subCategory(itemCategory.getSubCategory())
+                                        .topCategory(itemCategory.getTopCategory())
+                                        .build())
+                .collect(Collectors.toList());
+    }
+}

src/main/java/until/the/eternity/itemoption/domain/entity/ItemOption.java

@@ -55,15 +55,15 @@ public void createId() {
 
     public void setAuctionHistory(AuctionHistory auctionHistory) {
 
-        // 1️⃣ 이전 연관관계 정리
+        // 이전 연관관계 정리
         if (this.auctionHistory != null) {
             this.auctionHistory.getItemOptions().remove(this);
         }
 
-        // 2️⃣ 새 연관관계 설정
+        // 새 연관관계 설정
         this.auctionHistory = auctionHistory;
 
-        // 3️⃣ 반대 쪽 컬렉션 동기화
+        // 반대 쪽 컬렉션 동기화
         if (auctionHistory != null && !auctionHistory.getItemOptions().contains(this)) {
             auctionHistory.getItemOptions().add(this);
         }

src/test/java/until/the/eternity/auctionhistory/application/service/AuctionHistoryServiceTest.java

@@ -1,5 +1,11 @@
 package until.the.eternity.auctionhistory.application.service;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.*;
+
+import java.util.List;
+import java.util.Optional;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -21,13 +27,6 @@
 import until.the.eternity.common.request.PageRequestDto;
 import until.the.eternity.common.response.PageResponseDto;
 
-import java.util.List;
-import java.util.Optional;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.mockito.Mockito.*;
-
 @ExtendWith(MockitoExtension.class)
 class AuctionHistoryServiceTest {
 

src/test/java/until/the/eternity/auctionhistory/application/service/fetcher/AuctionHistoryFetcherTest.java

@@ -1,5 +1,12 @@
 package until.the.eternity.auctionhistory.application.service.fetcher;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.*;
+
+import java.time.Instant;
+import java.util.List;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -14,14 +21,6 @@
 import until.the.eternity.auctionhistory.interfaces.external.dto.OpenApiAuctionHistoryResponse;
 import until.the.eternity.common.enums.ItemCategory;
 
-import java.time.Instant;
-import java.util.List;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.eq;
-import static org.mockito.Mockito.*;
-
 @ExtendWith(MockitoExtension.class)
 class AuctionHistoryFetcherTest {
 

src/test/java/until/the/eternity/auctionhistory/application/service/persister/AuctionHistoryPersisterTest.java

@@ -1,5 +1,11 @@
 package until.the.eternity.auctionhistory.application.service.persister;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.*;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -13,13 +19,6 @@
 import until.the.eternity.auctionhistory.interfaces.external.dto.OpenApiAuctionHistoryResponse;
 import until.the.eternity.common.enums.ItemCategory;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.mockito.Mockito.*;
-
 @ExtendWith(MockitoExtension.class)
 class AuctionHistoryPersisterTest {