private static IEnumerable GenerateExportImportDeviceListForBulkOperations()

in iothub/service/src/Registry/RegistryManager.cs [3023:3080]
46 lines of code
12 McCabe index (conditional complexity)

        private static IEnumerable<ExportImportDevice> GenerateExportImportDeviceListForBulkOperations(IEnumerable<Device> devices, ImportMode importMode)
        {
            if (devices == null)
            {
                throw new ArgumentNullException(nameof(devices));
            }

            if (!devices.Any())
            {
                throw new ArgumentException($"Parameter {nameof(devices)} cannot be empty.");
            }

            var exportImportDeviceList = new List<ExportImportDevice>(devices.Count());
            foreach (Device device in devices)
            {
                ValidateDeviceId(device);

                switch (importMode)
                {
                    case ImportMode.Create:
                        if (!string.IsNullOrWhiteSpace(device.ETag))
                        {
                            throw new ArgumentException(ApiResources.ETagSetWhileRegisteringDevice);
                        }
                        break;

                    case ImportMode.Update:
                        // No preconditions
                        break;

                    case ImportMode.UpdateIfMatchETag:
                        if (string.IsNullOrWhiteSpace(device.ETag))
                        {
                            throw new ArgumentException(ApiResources.ETagNotSetWhileUpdatingDevice);
                        }
                        break;

                    case ImportMode.Delete:
                        // No preconditions
                        break;

                    case ImportMode.DeleteIfMatchETag:
                        if (string.IsNullOrWhiteSpace(device.ETag))
                        {
                            throw new ArgumentException(ApiResources.ETagNotSetWhileDeletingDevice);
                        }
                        break;

                    default:
                        throw new ArgumentException(IotHubApiResources.GetString(ApiResources.InvalidImportMode, importMode));
                }

                var exportImportDevice = new ExportImportDevice(device, importMode);
                exportImportDeviceList.Add(exportImportDevice);
            }

            return exportImportDeviceList;
        }