Device dev = getDevice(did); DeviceDescription desc = (dev == null) ? null : BasicDeviceOperator.descriptionOf(dev); desc = BasicDeviceOperator.combine(cfg, desc); if (desc != null && dp != null) { Device dev = getDevice(did); DeviceDescription desc = (dev == null) ? null : BasicDeviceOperator.descriptionOf(dev); Optional<Config> prevConfig = event.prevConfig(); desc = deviceAnnotationOp.combine(did, desc, prevConfig);