feat: 공지 카테고리(타입) 조회 API 구현 (#312)

src/main/java/com/listywave/admin/Admin.java

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+package com.listywave.admin;
+
+import static jakarta.persistence.GenerationType.IDENTITY;
+import static lombok.AccessLevel.PROTECTED;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@NoArgsConstructor(access = PROTECTED)
+@AllArgsConstructor
+public class Admin {
+
+    @Id
+    @GeneratedValue(strategy = IDENTITY)
+    private Long id;
+
+    @Column(nullable = false, length = 40, unique = true)
+    private String ip;
+
+    @Column(nullable = false, length = 50, unique = true)
+    private String account;
+
+    @Column(nullable = false, length = 50)
+    private String password;
+}

src/main/java/com/listywave/admin/AdminRepository.java

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+package com.listywave.admin;
+
+import static com.listywave.common.exception.ErrorCode.RESOURCE_NOT_FOUND;
+
+import com.listywave.common.exception.CustomException;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface AdminRepository extends JpaRepository<Admin, Long> {
+
+    default Admin getById(Long id) {
+        return findById(id).orElseThrow(() -> new CustomException(RESOURCE_NOT_FOUND));
+    }
+}

src/main/java/com/listywave/admin/AdminService.java

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+package com.listywave.admin;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional
+@RequiredArgsConstructor
+public class AdminService {
+
+    private final AdminRepository adminRepository;
+
+    public void validateExist(Long adminId) {
+        adminRepository.getById(adminId);
+    }
+}

src/main/java/com/listywave/notice/application/converter/NoticeTypeConverter.java

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+package com.listywave.notice.application.converter;
+
+import com.listywave.notice.application.domain.NoticeType;
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+
+@Converter(autoApply = true)
+public class NoticeTypeConverter implements AttributeConverter<NoticeType, String> {
+
+    @Override
+    public String convertToDatabaseColumn(NoticeType noticeType) {
+        return String.valueOf(noticeType.getCode());
+    }
+
+    @Override
+    public NoticeType convertToEntityAttribute(String s) {
+        return NoticeType.codeOf(Integer.parseInt(s));
+    }
+}

src/main/java/com/listywave/notice/application/domain/NoticeType.java

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+package com.listywave.notice.application.domain;
+
+import static com.listywave.common.exception.ErrorCode.NOT_EXIST_CODE;
+
+import com.listywave.common.exception.CustomException;
+import java.util.Arrays;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public enum NoticeType {
+
+    NEWS(1, "소식"),
+    EVENT(2, "이벤트"),
+    TIP(3, "팁"),
+    ;
+
+    private final int code;
+    private final String viewName;
+
+    public static NoticeType codeOf(int code) {
+        return Arrays.stream(NoticeType.values())
+                .filter(noticeType -> noticeType.getCode() == code)
+                .findFirst()
+                .orElseThrow(() -> new CustomException(NOT_EXIST_CODE, NOT_EXIST_CODE.getDetail() + " 입력값: " + code));
+    }
+}

src/main/java/com/listywave/notice/presentation/NoticeController.java

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+package com.listywave.notice.presentation;
+
+import com.listywave.admin.AdminService;
+import com.listywave.common.auth.Auth;
+import com.listywave.notice.application.domain.NoticeType;
+import com.listywave.notice.presentation.dto.NoticeCategoryFindResponse;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+public class NoticeController {
+
+    private final AdminService adminService;
+
+    @GetMapping("/admin/notices/categories")
+    ResponseEntity<List<NoticeCategoryFindResponse>> findNoticeCategories(@Auth Long adminId) {
+        adminService.validateExist(adminId);
+        List<NoticeCategoryFindResponse> result = NoticeCategoryFindResponse.toList(NoticeType.values());
+        return ResponseEntity.ok(result);
+    }
+}

src/main/java/com/listywave/notice/presentation/dto/NoticeCategoryFindResponse.java

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+package com.listywave.notice.presentation.dto;
+
+import com.listywave.notice.application.domain.NoticeType;
+import java.util.Arrays;
+import java.util.List;
+
+public record NoticeCategoryFindResponse(
+        int code,
+        String viewName
+) {
+
+    public static List<NoticeCategoryFindResponse> toList(NoticeType[] types) {
+        return Arrays.stream(types)
+                .map(type -> new NoticeCategoryFindResponse(type.getCode(), type.getViewName()))
+                .toList();
+    }
+}

src/test/java/com/listywave/notice/application/domain/NoticeTypeTest.java

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+package com.listywave.notice.application.domain;
+
+import static com.listywave.common.exception.ErrorCode.NOT_EXIST_CODE;
+import static com.listywave.notice.application.domain.NoticeType.NEWS;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import com.listywave.common.exception.CustomException;
+import com.listywave.common.exception.ErrorCode;
+import org.junit.jupiter.api.Test;
+
+class NoticeTypeTest {
+
+    @Test
+    void 존재하지_않는_코드_번호로_생성하면_예외가_발생한다() {
+        // given
+        int code = 0;
+
+        // when
+        ErrorCode result = assertThrows(CustomException.class, () -> NoticeType.codeOf(code))
+                .getErrorCode();
+
+        // then
+        assertThat(result).isEqualTo(NOT_EXIST_CODE);
+    }
+
+    @Test
+    void 코드_번호로_생성한다() {
+        // given
+        int code = 1;
+
+        // when
+        NoticeType result = NoticeType.codeOf(code);
+
+        // then
+        assertThat(result).isEqualTo(NEWS);
+    }
+}