toJson method
Implementation
String toJson() {
return convert.jsonEncode({
"callbackId": callbackId == null ? "" : callbackId,
"responseId": responseId == null ? "" : responseId,
"responseData": responseData == null ? "" : responseData,
"data": data == null ? "" : data,
"handlerName": handlerName == null ? "" : handlerName
});
}