运行时gson对象类型转换

我有一个模板对象类型ExternalActionReqBean,它有一个可以通过指示操作字段来设置任何类的对象。

例如,如果action=“frozen”,ExternalActionReqBean->Payload将ExternalActionFrozenReqBean类类型, 如果action=“unfrozen”ExternalActionUnfrozenReqBean类类型将被使用。

如果有效负载如下,那么实现这一点的最佳实践是什么?

“txnid”:“txn”,“action”:“frozed”,“resource”:“pnsender”,“payload”:“msisdn_list_157;:[__XXXX_,__,_ XXX__]

ExternalActionReqBean externalActionReqBean = GSON.fromJson(payload, ExternalActionReqBean.class);
             if("FROZEN".equals(externalActionReqBean.getAction())){
               // externalActionFrozenReqBean = GSON.fromJson(externalActionReqBean.getPayload(),ExternalActionFrozenReqBean.class);
             }

@Data
@AllArgsConstructor
public class ExternalActionReqBean {

   private String txnID;
   private String action;
   private String resource;
   private Object payload;

}



@Data
public class ExternalActionFrozenReqBean {

   private List<String> msisdn_list;

}

@Data
public class ExternalActionUnFrozenReqBean {

   private String result;

}