最后元

import com.example.entity.Department;
import com.example.entity.IndexPattern;
import com.example.mapper.DepartmentMapper;
import com.example.service.IndexPatternService;
import com.example.request.QueryIndexPatternRequest;
import com.example.response.QueryIndexPatternResponse;
import com.example.exception.BaseBizException;
import com.example.enums.HadesErrCodeEnum;
import com.example.utils.RespUtils;

import java.util.List;
import java.util.stream.Collectors;

public class DepartmentServiceImpl {

private final DepartmentMapper departmentMapper;
private final IndexPatternService indexPatternService;

public DepartmentServiceImpl(DepartmentMapper departmentMapper, IndexPatternService indexPatternService) {
    this.departmentMapper = departmentMapper;
    this.indexPatternService = indexPatternService;
}

@Override
public QueryIndexPatternResponse queryIndexPatternByDepartmentId(QueryIndexPatternRequest request) {
QueryDepartmentIndexPatternResponse response = new QueryDepartmentIndexPatternResponse();

    if (StringUtils.isEmpty(departmentId)) {
        throw new TitanException("所传参数为空");
    }

    Department department = departmentMapper.selectOneByExample(departmentId);
    if (department == null) {
        QueryIndexPatternResponse response = new QueryIndexPatternResponse();
        RespUtils.setError(HadesErrCodeEnum.DEPARTMENT_NOT_FOUND, response);
        return response;
    }

    List<IndexPattern> indexPatterns = indexPatternService.getIndexPatternByDepartmentId(departmentId);
    List<String> indexPatternNames = indexPatterns.stream()
            .map(IndexPattern::getName)
            .collect(Collectors.toList());

    QueryIndexPatternResponse response = new QueryIndexPatternResponse();
    response.setIndexPatternNames(indexPatternNames);
    RespUtils.setSuccess(response);
    return response;
}

}