onCreate method Null safety

  1. @override
void onCreate()
override

Implementation

@override
void onCreate() {
  if (!_onCreated) {
    _onCreated = true;
    messages?.listen((event) {
      TypedEvent<JanusEvent> typedEvent = TypedEvent<JanusEvent>(
          event: JanusEvent.fromJson(event.event), jsep: event.jsep);
      if (typedEvent.event.plugindata?.data['videocall'] == 'event' &&
          typedEvent.event.plugindata?.data['result'] != null &&
          typedEvent.event.plugindata?.data['result']['event'] ==
              'registered') {
        typedEvent.event.plugindata?.data = VideoCallRegisteredEvent.fromJson(
            typedEvent.event.plugindata?.data);
        _typedMessagesSink?.add(typedEvent);
      } else if (typedEvent.event.plugindata?.data['videocall'] == 'event' &&
          typedEvent.event.plugindata?.data['result'] != null &&
          typedEvent.event.plugindata?.data['result']['event'] == 'calling') {
        typedEvent.event.plugindata?.data =
            VideoCallCallingEvent.fromJson(typedEvent.event.plugindata?.data);
        _typedMessagesSink?.add(typedEvent);
      } else if (typedEvent.event.plugindata?.data['videocall'] == 'event' &&
          typedEvent.event.plugindata?.data['result'] != null &&
          typedEvent.event.plugindata?.data['result']['event'] ==
              'incomingcall') {
        typedEvent.event.plugindata?.data =
            VideoCallIncomingCallEvent.fromJson(
                typedEvent.event.plugindata?.data);
        _typedMessagesSink?.add(typedEvent);
      } else if (typedEvent.event.plugindata?.data['videocall'] == 'event' &&
          typedEvent.event.plugindata?.data['result'] != null &&
          typedEvent.event.plugindata?.data['result']['event'] ==
              'accepted') {
        typedEvent.event.plugindata?.data = VideoCallAcceptedEvent.fromJson(
            typedEvent.event.plugindata?.data);
        _typedMessagesSink?.add(typedEvent);
      } else if (typedEvent.event.plugindata?.data['videocall'] == 'event' &&
          typedEvent.event.plugindata?.data['result'] != null &&
          typedEvent.event.plugindata?.data['result']['event'] == 'hangup') {
        typedEvent.event.plugindata?.data =
            VideoCallHangupEvent.fromJson(typedEvent.event.plugindata?.data);
        _typedMessagesSink?.add(typedEvent);
      } else if (typedEvent.event.plugindata?.data['videocall'] == 'event' &&
          (typedEvent.event.plugindata?.data['error_code'] != null ||
              typedEvent.event.plugindata?.data?['result']?['code'] !=
                  null)) {
        _typedMessagesSink
            ?.addError(JanusError.fromMap(typedEvent.event.plugindata?.data));
      }
    });
  }
}