feat: 테마 도메인에서 사용하는 커스텀 예외 정의 및 Service 적용

src/main/kotlin/roomescape/theme/business/ThemeService.kt

@@ -1,17 +1,13 @@
 package roomescape.theme.business
 
 import org.springframework.data.repository.findByIdOrNull
-import org.springframework.http.HttpStatus
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
-import roomescape.common.exception.ErrorType
-import roomescape.common.exception.RoomescapeException
+import roomescape.theme.exception.ThemeErrorCode
+import roomescape.theme.exception.ThemeException
 import roomescape.theme.infrastructure.persistence.ThemeEntity
 import roomescape.theme.infrastructure.persistence.ThemeRepository
-import roomescape.theme.web.ThemeRequest
-import roomescape.theme.web.ThemeResponse
-import roomescape.theme.web.ThemesResponse
-import roomescape.theme.web.toResponse
+import roomescape.theme.web.*
 import java.time.LocalDate
 
 @Service
@@ -20,11 +16,7 @@ class ThemeService(
 ) {
     @Transactional(readOnly = true)
     fun findById(id: Long): ThemeEntity = themeRepository.findByIdOrNull(id)
-            ?: throw RoomescapeException(
-                    ErrorType.THEME_NOT_FOUND,
-                    "[themeId: $id]",
-                    HttpStatus.BAD_REQUEST
-            )
+            ?: throw ThemeException(ThemeErrorCode.THEME_NOT_FOUND)
 
     @Transactional(readOnly = true)
     fun findThemes(): ThemeRetrieveListResponse = themeRepository.findAll()
@@ -43,31 +35,19 @@ class ThemeService(
     @Transactional
     fun createTheme(request: ThemeCreateRequest): ThemeRetrieveResponse {
         if (themeRepository.existsByName(request.name)) {
-            throw RoomescapeException(
-                    ErrorType.THEME_DUPLICATED,
-                    "[name: ${request.name}]",
-                    HttpStatus.CONFLICT
-            )
+            throw ThemeException(ThemeErrorCode.THEME_NAME_DUPLICATED)
         }
 
-        return ThemeEntity(
-                name = request.name,
-                description = request.description,
-                thumbnail = request.thumbnail
-        ).also {
-            themeRepository.save(it)
-        }.toResponse()
+        val theme: ThemeEntity = request.toEntity()
+        return themeRepository.save(theme).toResponse()
     }
 
     @Transactional
     fun deleteTheme(id: Long) {
         if (themeRepository.isReservedTheme(id)) {
-            throw RoomescapeException(
-                    ErrorType.THEME_IS_USED_CONFLICT,
-                    "[themeId: %d]",
-                    HttpStatus.CONFLICT
-            )
+            throw ThemeException(ThemeErrorCode.THEME_ALREADY_RESERVED)
         }
+
         themeRepository.deleteById(id)
     }
 }

src/main/kotlin/roomescape/theme/exception/ThemeErrorCode.kt

@@ -0,0 +1,14 @@
+package roomescape.theme.exception
+
+import org.springframework.http.HttpStatus
+import roomescape.common.exception.ErrorCode
+
+enum class ThemeErrorCode(
+        override val httpStatus: HttpStatus,
+        override val errorCode: String,
+        override val message: String
+) : ErrorCode {
+    THEME_NOT_FOUND(HttpStatus.NOT_FOUND, "TH001", "테마를 찾을 수 없어요."),
+    THEME_NAME_DUPLICATED(HttpStatus.BAD_REQUEST, "TH002", "이미 같은 이름의 테마가 있어요."),
+    THEME_ALREADY_RESERVED(HttpStatus.CONFLICT, "TH003", "예약된 테마라 삭제할 수 없어요.")
+}

src/main/kotlin/roomescape/theme/exception/ThemeException.kt

@@ -0,0 +1,8 @@
+package roomescape.theme.exception
+
+import roomescape.common.exception.RoomescapeExceptionV2
+
+class ThemeException(
+        override val errorCode: ThemeErrorCode,
+        override val message: String = errorCode.message
+) : RoomescapeExceptionV2(errorCode, message)