Added ChangePet Functionality (#162)

web_backend/src/main/java/haw/teamagochi/backend/device/logic/UcChangePet.java

@@ -0,0 +1,15 @@
+package haw.teamagochi.backend.device.logic;
+
+import haw.teamagochi.backend.device.dataaccess.model.DeviceEntity;
+
+public interface UcChangePet {
+
+  /**
+   *
+   * @param deviceId id of the device
+   * @param petId id of pet to be put on the device
+   * @return the Device Entity
+   */
+  DeviceEntity changePet(long deviceId, long petId);
+
+}

web_backend/src/main/java/haw/teamagochi/backend/device/logic/UcChangePetImpl.java

@@ -0,0 +1,35 @@
+package haw.teamagochi.backend.device.logic;
+
+import haw.teamagochi.backend.device.dataaccess.model.DeviceEntity;
+import haw.teamagochi.backend.device.dataaccess.repository.DeviceRepository;
+import haw.teamagochi.backend.pet.dataaccess.model.PetEntity;
+import haw.teamagochi.backend.pet.logic.UcFindPet;
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.inject.Inject;
+import jakarta.transaction.Transactional;
+import jakarta.ws.rs.NotFoundException;
+
+@ApplicationScoped
+public class UcChangePetImpl implements UcChangePet{
+
+  @Inject
+  DeviceRepository deviceRepository;
+
+  @Inject
+  UcFindDevice ucFindDevice;
+  @Inject
+  UcFindPet findPet;
+
+  @Override
+  @Transactional
+  public DeviceEntity changePet(long deviceId, long petId) {
+    DeviceEntity device = ucFindDevice.find(deviceId);
+    PetEntity pet = findPet.find(petId);
+    if(device == null || pet == null){
+      return null;
+    }
+    device.setPet(pet);
+    //deviceRepository.persist(device); --> nicht da als @Transactional gekennzeichnet
+    return device;
+  }
+}

web_backend/src/main/java/haw/teamagochi/backend/device/service/rest/v1/DeviceRestSelfService.java

@@ -1,6 +1,7 @@
 package haw.teamagochi.backend.device.service.rest.v1;
 
 import haw.teamagochi.backend.device.dataaccess.model.DeviceEntity;
+import haw.teamagochi.backend.device.logic.UcChangePet;
 import haw.teamagochi.backend.device.logic.UcFindDevice;
 import haw.teamagochi.backend.device.logic.UcManageDevice;
 import haw.teamagochi.backend.device.service.rest.v1.mapper.DeviceMapper;
@@ -41,6 +42,8 @@ public class DeviceRestSelfService {
 
   @Inject
   protected UcManageDevice ucManageDevice;
+  @Inject
+  UcChangePet ucChangePet;
 
   /**
    * Get all devices.
@@ -101,4 +104,24 @@ public DeviceDTO registerDevice(
     }
     throw new NotFoundException();
   }
+
+  @POST
+  @Path("/changepet/{deviceID}/{PetID}")
+  @Operation(summary = "Set Pet for the Device")
+  @APIResponse(responseCode = "200")
+  @APIResponse(responseCode = "404", description = "Not Found")
+  public DeviceDTO changePet(@PathParam("deviceID") long deviceId, @PathParam("PetID") long petId){
+    String uuid = SecurityUtil.getExternalUserId(identity);
+    DeviceEntity device = ucFindDevice.find(deviceId);
+    if(device != null
+        && device.getOwner() != null
+        && Objects.equals(device.getOwner().getExternalID().toString(), uuid)){//request authorised
+      device = ucChangePet.changePet(deviceId, petId);
+      if (device != null) {
+        return deviceMapper.mapEntityToTransferObject(device);
+      }//if
+    }//if
+    throw new NotFoundException();
+    }//method
+
 }