src/main/java/de/hmmh/pmt/ApiController.java

@@ -19,8 +19,8 @@ import org.springframework.web.client.HttpClientErrorException;
 import org.springframework.web.client.RestClientException;
 
 import java.time.ZoneOffset;
-import java.util.List;
-import java.util.Optional;
+import java.util.*;
+import java.util.stream.Collectors;
 
 @Controller
 @RequestMapping("${openapi.projectManagement.base-path:/api/v1}")
@@ -153,4 +153,32 @@ public class ApiController implements DefaultApi {
         allocationRepository.delete(allocation.get());
         return new ResponseEntity<>(HttpStatus.NO_CONTENT);
     }
+
+    @Override
+    public ResponseEntity<ProjectEmployeesDTO> getAListOfAllEmployeesFromASpecificProject(Long id) {
+        if (!projectRepository.existsById(id)) {
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        ProjectEmployeesDTO dto = new ProjectEmployeesDTO();
+        List<Allocation> allocationsByProject = allocationRepository.findAllByProjectId(id);
+        if (allocationsByProject.isEmpty()) {
+            return new ResponseEntity<>(dto, HttpStatus.OK);
+        }
+
+        Set<Long> employeeIds = allocationsByProject.stream()
+                .map(Allocation::getEmployeeId)
+                .collect(Collectors.toSet());
+
+        try {
+            List<Employee> employees = apiClientFactory.getEmployeeApi().findAll1().stream()
+                    .filter(employeeResponseDTO -> employeeIds.contains(employeeResponseDTO.getId()))
+                    .map(mapper::map)
+                    .toList();
+            dto.setEmployees(employees);
+            return new ResponseEntity<>(dto, HttpStatus.OK);
+        }  catch (RestClientException exception) {
+            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
+        }
+    }
 }

src/main/java/de/hmmh/pmt/util/Mapper.java

@@ -3,8 +3,14 @@ package de.hmmh.pmt.util;
 import de.hmmh.pmt.db.Project;
 import de.hmmh.pmt.dtos.CreateProjectDTO;
 import de.hmmh.pmt.dtos.CreatedProjectDTO;
+import de.hmmh.pmt.dtos.Employee;
+import de.hmmh.pmt.dtos.Qualification ;
+import de.hmmh.pmt.employee.dtos.EmployeeResponseDTO;
+import de.hmmh.pmt.employee.dtos.QualificationGetDTO;
 import org.springframework.stereotype.Component;
 
+import java.util.List;
+
 @Component
 public class Mapper {
     public Project map(CreateProjectDTO dto) {
@@ -29,4 +35,30 @@ public class Mapper {
         dto.setPlannedEnd(project.getPlannedEnd());
         return dto;
     }
+
+    public Employee map(EmployeeResponseDTO employeeResponseDTO)  {
+        Employee dto = new Employee();
+        dto.setId(employeeResponseDTO.getId());
+        dto.setLastName(employeeResponseDTO.getLastName());
+        dto.setFirstName(employeeResponseDTO.getFirstName());
+        dto.setStreet(employeeResponseDTO.getStreet());
+        dto.setPostcode(employeeResponseDTO.getPostcode());
+        dto.setCity(employeeResponseDTO.getCity());
+        dto.setPhone(employeeResponseDTO.getPhone());
+
+        List<Qualification > skillSet = employeeResponseDTO.getSkillSet().stream()
+                .map(this::map)
+                .toList();
+
+        dto.setSkillSet(skillSet);
+        return dto;
+    }
+
+    private Qualification  map(QualificationGetDTO qualificationGetDTO) {
+        Qualification  dto = new Qualification ();
+        dto.setId(qualificationGetDTO.getId());
+        dto.setSkill(qualificationGetDTO.getSkill());
+        return dto;
+    }
+
 }