jsinterop woes: Part 1: instanceof function in generics casting

Hi,

again I don't know if this is a bug but it hurts my style

D3 defines d3.scale.ordinal as both a function and an object. $wnd.d3.scale.ordinal returns function() in the browser's console though

   @JsType(isNative = true, name = "ordinal")
      public static class Ordinal {
           /** @todo TODO: this crashes. Why? */
           public native <I, O> O range(I[] values);       // this doesn't work
           //public native <I> Ordinal range(I[] values); // this works
      }

I want the generic type because then I can put it in a base class and share some code.

I am using it like this

D3.Scale.Ordinal color = D3.Scale.ordinal().range(new String[] {"#98abc5", "#8a89a6"});

Here is the javascript exception:

Error: java.lang.ClassCastException
    at java_lang_ClassCastException_ClassCastException__V.java_lang_Throwable_createError__Ljava_lang_String_2Ljava_lang_Object_2 [as package_private$java_lang$createError__Ljava_lang_String_2Ljava_lang_Object_2] (dashboard-0.js:7245)
    at java_lang_ClassCastException_ClassCastException__V.java_lang_Throwable_initializeBackingError__V [as private$java_lang_Throwable$initializeBackingError__V] (dashboard-0.js:7300)
    at java_lang_ClassCastException_ClassCastException__V.java_lang_Throwable_Throwable__V (dashboard-0.js:7133)
    at java_lang_ClassCastException_ClassCastException__V.java_lang_Exception_Exception__V (dashboard-0.js:7381)
    at java_lang_ClassCastException_ClassCastException__V.java_lang_RuntimeException_RuntimeException__V (dashboard-0.js:29724)
    at java_lang_ClassCastException_ClassCastException__V (dashboard-0.js:57274)
    at javaemul_internal_InternalPreconditions_checkCriticalType__ZV (dashboard-0.js:72135)
    at javaemul_internal_InternalPreconditions_checkType__ZV (dashboard-0.js:72342)
    at com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2 (dashboard-0.js:707)   

In

function com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2(src_0, jsType){
  com_google_gwt_lang_Cast_$clinit__V();
  javaemul_internal_InternalPreconditions_checkType__ZV(com_google_gwt_lang_Cast_jsEquals__Ljava_lang_Object_2Ljava_lang_Object_2Z(src_0, null) || com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Z(src_0, jsType));
  return src_0;
}

Arguments:

• src_0:
• passed:
• evaluated: function scale(x)
• jsType:
• passed: $wnd.scale.ordinal
• evaluated: function anonymous()

The reason it fails is that

function com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Z(obj, jsType){
  com_google_gwt_lang_Cast_$clinit__V();
  return obj && (jsType && obj instanceof jsType);
}

obj is src_0 != null and jsType = function anonymous() != null but (obj instanceof jsType) === false

Any idea about that?

--

Vassilis Virvilis

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