feat: Implement feature to get all projects from an employee (SCRUM-31) (!37)

Co-authored-by: Phan Huy Tran <p.tran@neusta.de>
Reviewed-on: #37
Reviewed-by: Jan Gleytenhoover <krisellp9@gmail.com>

src/main/java/de/szut/lf8_starter/employee/EmployeeService.java

@@ -1,7 +1,11 @@
 package de.szut.lf8_starter.employee;
 
 import de.szut.lf8_starter.exceptionHandling.ResourceNotFoundException;
+import de.szut.lf8_starter.project.ProjectEntity;
+import de.szut.lf8_starter.project.ProjectRepository;
 import de.szut.lf8_starter.project.dto.employee.GetEmployeeDto;
+import de.szut.lf8_starter.project.dto.project.GetProjectDto;
+import de.szut.lf8_starter.project.mapper.ProjectMapper;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
@@ -9,12 +13,19 @@ import org.springframework.stereotype.Service;
 import org.springframework.web.client.HttpClientErrorException;
 import org.springframework.web.client.RestTemplate;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Service
 public class EmployeeService {
     private final RestTemplate restTemplate;
+    private final ProjectRepository projectRepository;
+    private final ProjectMapper projectMapper;
 
-    public EmployeeService(RestTemplate restTemplate) {
+    public EmployeeService(RestTemplate restTemplate, ProjectRepository projectRepository, ProjectMapper projectMapper) {
         this.restTemplate = restTemplate;
+        this.projectRepository = projectRepository;
+        this.projectMapper = projectMapper;
     }
 
     public boolean employeeExists(String accessToken, Long employeeId) {
@@ -48,4 +59,15 @@ public class EmployeeService {
             throw new ResourceNotFoundException("Employee not found");
         }
     }
+
+    public List<GetProjectDto> getProjects(Long employeeId) {
+        ArrayList<ProjectEntity> projects = this.projectRepository.findAllByEmployeeId(employeeId);
+        ArrayList<GetProjectDto> projectDtos = new ArrayList<>();
+
+        for (ProjectEntity project : projects) {
+            projectDtos.add(this.projectMapper.mapToGetDto(project));
+        }
+
+        return projectDtos;
+    }
 }

src/main/java/de/szut/lf8_starter/project/ProjectRepository.java

@@ -1,8 +1,14 @@
 package de.szut.lf8_starter.project;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
 
+import java.util.ArrayList;
+
 @Repository
 public interface ProjectRepository extends JpaRepository<ProjectEntity, Long> {
+    @Query("SELECT p FROM ProjectEntity p WHERE :employeeId MEMBER OF p.employees")
+    ArrayList<ProjectEntity> findAllByEmployeeId(@Param("employeeId") Long employeeId);
 }

src/main/java/de/szut/lf8_starter/project/action/employee/GetProjectsFromEmployee.java

@@ -0,0 +1,39 @@
+package de.szut.lf8_starter.project.action.employee;
+
+import de.szut.lf8_starter.employee.EmployeeService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class GetProjectsFromEmployee {
+    private final EmployeeService employeeService;
+
+    public GetProjectsFromEmployee(EmployeeService employeeService) {
+        this.employeeService = employeeService;
+    }
+
+    @Operation(summary = "Get all projects from employee")
+    @ApiResponses(value = {
+            @ApiResponse(responseCode = "200", description = "Get all projects from employee", content = @Content),
+            @ApiResponse(responseCode = "404", description = "Employee not found", content = @Content)
+    })
+    @GetMapping("/employees/{employeeId}/projects")
+    public ResponseEntity<Object> create(
+            @PathVariable Long employeeId,
+            @RequestHeader("Authorization") String accessToken
+    ) {
+        if (!this.employeeService.employeeExists(accessToken, employeeId)) {
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        return new ResponseEntity<>(this.employeeService.getProjects(employeeId), HttpStatus.OK);
+    }
+}