You may want to use GWT 2.8.0-SNAPSHOT and the new JsInterop annotations;
as your usecase maybe is just not supported with the "old" annotations.
On Monday, October 26, 2015 at 11:10:28 AM UTC+1, Brian Pedersen wrote:
>
> I have a dispatch method, exposed through JsInterop, which can take
> various kinds of payloads.
>
> Once called from native javascript, I need to cast the payload, but this
> doesn't quite work as I would like it too.
>
> Here is a simplified example.
>
> *GWT:*
> @JsExport
> @JsType
> @JsNamespace("foo")
> public class Dispatcher {
> public String dispatch(String action, Payload payload){
> if("action1".equals(action))
> return dispatchWithCast(payload);
> return "Unknown action: " + action;
> }
> public String dispatchWithCast(Payload payload){
> ConcretePayload w = (ConcretePayload) payload;
> return w.foo;
> }
> }
>
> @JsExport
> @JsType
> public class Payload {}
>
> @JsExport
> @JsType
> public class ConcretePayload extends Payload {
> public String foo;
> public int bar;
> }
>
> *Javascript:*
> var test = new foo.Dispatcher();
> alert("Dispatch: " + test.dispatch("action1", {"foo": "a", "bar": 2}));
> // Uncaught java.lang.ClassCastException
>
> Everything works just fine if I replace the Payload type in the Dispatcher
> class
> with ConcretePayload, and removes the cast.
>
> I guess this this may be beyond the capabilities of the transpiler, I just
> need to figure out an alternative approach.
>
> Any ideas?
>
> (By the way, I am using the sso linker.)
>
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