jsinterop woes: Part 2: return Double[]

Hi,

I am not sure if it is a bug but it kills my beautiful jsinterop mappings.

Let's say that I have a native js function (d3.extent) that returns an array of something. It may be dates it may be doubles..

This is mapped nicely with

    public static native <T, V> V[] extent(T[] data,
            AccessorFunction<T, V> accessor);

Where AccessorFunction is

    @JsFunction
    public static interface AccessorFunction<T, V> {
        public V get(T d);
    }

The above scheme works for Date and other objects but it fails with Double. If I specify another variant of d3.extent that returns double[] it works

Here is the javascript exception

Uncaught 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:29760)
    at java_lang_ClassCastException_ClassCastException__V (dashboard-0.js:57310)
    at javaemul_internal_InternalPreconditions_checkCriticalType__ZV (dashboard-0.js:72171)
    at javaemul_internal_InternalPreconditions_checkType__ZV (dashboard-0.js:72378)
    at com_google_gwt_lang_Cast_castTo__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2 (dashboard-0.js:647)

It goes here

function com_google_gwt_lang_Cast_castTo__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2(src_0, dstId){
  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_canCast__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Z(src_0, dstId));
  return src_0;
}

Arguments:

• src_0:
• evaluated: js array of numbers as it should be
  
• dstId:
• evaluated: 2396

and then it goes to

function com_google_gwt_lang_Cast_canCast__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Z(src_0, dstId){
  com_google_gwt_lang_Cast_$clinit__V();
  if (com_google_gwt_lang_Cast_instanceOfString__Ljava_lang_Object_2Z(src_0)) {
    return !!com_google_gwt_lang_Cast_stringCastMap[dstId];
  }
   else if (src_0.java_lang_Object_castableTypeMap) {
    return !!src_0.java_lang_Object_castableTypeMap[dstId];
  }
   else if (com_google_gwt_lang_Cast_instanceOfDouble__Ljava_lang_Object_2Z(src_0)) {
    return !!com_google_gwt_lang_Cast_doubleCastMap[dstId];
  }
   else if (com_google_gwt_lang_Cast_instanceOfBoolean__Ljava_lang_Object_2Z(src_0)) {
    return !!com_google_gwt_lang_Cast_booleanCastMap[dstId];
  }
  return false;
}

where it fails.

Would it be possible to handle transparently also Double[] (and possibly String[])? as double[]?

   Thank you for reading that far...

Vassilis

--

Vassilis Virvilis

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