Generate question bank domain model from JDL

src/main/java/com/example/questionbank/service/SubjectService.java

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+package com.example.questionbank.service;
+
+import com.example.questionbank.domain.Subject;
+import com.example.questionbank.repository.SubjectRepository;
+import com.example.questionbank.service.dto.SubjectDTO;
+import com.example.questionbank.service.mapper.SubjectMapper;
+import java.util.Optional;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ * Service Implementation for managing {@link com.example.questionbank.domain.Subject}.
+ */
+@Service
+@Transactional
+public class SubjectService {
+
+    private static final Logger LOG = LoggerFactory.getLogger(SubjectService.class);
+
+    private final SubjectRepository subjectRepository;
+
+    private final SubjectMapper subjectMapper;
+
+    public SubjectService(SubjectRepository subjectRepository, SubjectMapper subjectMapper) {
+        this.subjectRepository = subjectRepository;
+        this.subjectMapper = subjectMapper;
+    }
+
+    /**
+     * Save a subject.
+     *
+     * @param subjectDTO the entity to save.
+     * @return the persisted entity.
+     */
+    public SubjectDTO save(SubjectDTO subjectDTO) {
+        LOG.debug("Request to save Subject : {}", subjectDTO);
+        Subject subject = subjectMapper.toEntity(subjectDTO);
+        subject = subjectRepository.save(subject);
+        return subjectMapper.toDto(subject);
+    }
+
+    /**
+     * Update a subject.
+     *
+     * @param subjectDTO the entity to save.
+     * @return the persisted entity.
+     */
+    public SubjectDTO update(SubjectDTO subjectDTO) {
+        LOG.debug("Request to update Subject : {}", subjectDTO);
+        Subject subject = subjectMapper.toEntity(subjectDTO);
+        subject = subjectRepository.save(subject);
+        return subjectMapper.toDto(subject);
+    }
+
+    /**
+     * Partially update a subject.
+     *
+     * @param subjectDTO the entity to update partially.
+     * @return the persisted entity.
+     */
+    public Optional<SubjectDTO> partialUpdate(SubjectDTO subjectDTO) {
+        LOG.debug("Request to partially update Subject : {}", subjectDTO);
+
+        return subjectRepository
+            .findById(subjectDTO.getId())
+            .map(existingSubject -> {
+                subjectMapper.partialUpdate(existingSubject, subjectDTO);
+
+                return existingSubject;
+            })
+            .map(subjectRepository::save)
+            .map(subjectMapper::toDto);
+    }
+
+    /**
+     * Get all the subjects.
+     *
+     * @param pageable the pagination information.
+     * @return the list of entities.
+     */
+    @Transactional(readOnly = true)
+    public Page<SubjectDTO> findAll(Pageable pageable) {
+        LOG.debug("Request to get all Subjects");
+        return subjectRepository.findAll(pageable).map(subjectMapper::toDto);
+    }
+
+    /**
+     * Get one subject by id.
+     *
+     * @param id the id of the entity.
+     * @return the entity.
+     */
+    @Transactional(readOnly = true)
+    public Optional<SubjectDTO> findOne(Long id) {
+        LOG.debug("Request to get Subject : {}", id);
+        return subjectRepository.findById(id).map(subjectMapper::toDto);
+    }
+
+    /**
+     * Delete the subject by id.
+     *
+     * @param id the id of the entity.
+     */
+    public void delete(Long id) {
+        LOG.debug("Request to delete Subject : {}", id);
+        subjectRepository.deleteById(id);
+    }
+}