feat: 자기소개 조회 기능 구현 - #20

src/main/java/org/mjulikelion/baker/service/introduce/IntroduceQueryService.java

@@ -0,0 +1,9 @@
+package org.mjulikelion.baker.service.introduce;
+
+import org.mjulikelion.baker.dto.response.ResponseDto;
+import org.mjulikelion.baker.dto.response.introduce.IntroduceGetResponseData;
+import org.springframework.http.ResponseEntity;
+
+public interface IntroduceQueryService {
+    ResponseEntity<ResponseDto<IntroduceGetResponseData>> getStudentIntroduce(String studentId);
+}

src/main/java/org/mjulikelion/baker/service/introduce/IntroduceQueryServiceImpl.java

@@ -0,0 +1,82 @@
+package org.mjulikelion.baker.service.introduce;
+
+import static org.mjulikelion.baker.errorcode.ErrorCode.APPLICATION_INTRODUCE_NOT_FOUND_ERROR;
+import static org.mjulikelion.baker.errorcode.ErrorCode.APPLICATION_NOT_FOUND_ERROR;
+
+import java.util.Comparator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.stream.Collectors;
+import lombok.AllArgsConstructor;
+import org.mjulikelion.baker.dto.response.ResponseDto;
+import org.mjulikelion.baker.dto.response.introduce.IntroduceGetResponseData;
+import org.mjulikelion.baker.exception.ApplicationIntroduceNotFoundException;
+import org.mjulikelion.baker.exception.ApplicationNotFoundException;
+import org.mjulikelion.baker.model.Application;
+import org.mjulikelion.baker.model.ApplicationIntroduce;
+import org.mjulikelion.baker.model.Introduce;
+import org.mjulikelion.baker.repository.ApplicationIntroduceRepository;
+import org.mjulikelion.baker.repository.ApplicationRepository;
+import org.mjulikelion.baker.vo.IntroduceDetailVO;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@AllArgsConstructor
+public class IntroduceQueryServiceImpl implements IntroduceQueryService {
+    private final ApplicationRepository applicationRepository;
+    private final ApplicationIntroduceRepository applicationIntroduceRepository;
+
+    @Override
+    @Transactional(readOnly = true)
+    public ResponseEntity<ResponseDto<IntroduceGetResponseData>> getStudentIntroduce(String studentId) {
+        Application application = this.findApplicationByStudentId(studentId);
+        List<ApplicationIntroduce> applicationIntroduceList = this.findApplicationIntroduces(application.getId());
+        List<IntroduceDetailVO> introduceDetailVOList = this.buildIntroduceDetailVOList(applicationIntroduceList);
+
+        IntroduceGetResponseData introduceGetResponseData = IntroduceGetResponseData.builder()
+                .introduceDetailVOList(introduceDetailVOList)
+                .part(application.getPart())
+                .build();
+
+        return ResponseEntity.ok(ResponseDto.res(HttpStatus.OK, "OK", introduceGetResponseData));
+    }
+
+    private Application findApplicationByStudentId(String studentId) {
+        return this.applicationRepository.findByStudentId(studentId)
+                .orElseThrow(() -> new ApplicationNotFoundException(APPLICATION_NOT_FOUND_ERROR));
+    }
+
+    private List<ApplicationIntroduce> findApplicationIntroduces(UUID applicationId) {
+        List<ApplicationIntroduce> applicationIntroduceList = this.applicationIntroduceRepository.findByApplicationId(
+                applicationId);
+        if (applicationIntroduceList.isEmpty()) {
+            throw new ApplicationIntroduceNotFoundException(APPLICATION_INTRODUCE_NOT_FOUND_ERROR);
+        }
+        return applicationIntroduceList;
+    }
+
+    private List<IntroduceDetailVO> buildIntroduceDetailVOList(List<ApplicationIntroduce> applicationIntroduceList) {
+        Map<Introduce, String> introduceMap = applicationIntroduceList.stream()
+                .sorted(Comparator.comparingInt(a -> a.getIntroduce().getSequence()))
+                .collect(Collectors.toMap(
+                        ApplicationIntroduce::getIntroduce,
+                        ApplicationIntroduce::getContent,
+                        (a, b) -> b,
+                        LinkedHashMap::new
+                ));
+
+        return introduceMap.keySet().stream()
+                .map(introduce -> IntroduceDetailVO.builder()
+                        .sequence(introduce.getSequence())
+                        .title(introduce.getTitle())
+                        .content(introduceMap.get(introduce))
+                        .build())
+                .collect(Collectors.toList());
+    }
+}
+