On Tuesday, March 20, 2012 12:49:10 PM UTC+1, Sandro Munda wrote:
>
> Hello everybody !
>
> I have a subclass of a JavaScriptObject with a generic type T.
>
> public class Foo<T> extends JavaScriptObject {
> // ...
> }
>
> In this class, I have a getValue() method that returns a T value.
>
> private final native T getValue() /*-{
> return this.value;
> }-*/;
>
> In my situation, T is an Integer. When I running the code I have the
> following exception :
>
> Caused by: java.lang.ClassCastException: Cannot cast
> java.lang.Integer to com.google.gwt.core.client.JavaScriptObject
>
> Is the value is a 'int', it works well. But not the Integer.
>
> How can I fix the problem ?
> Any workarrounds ?
>
You cannot use Integer as a generic parameter in this case; you have to
code specifically for the integer or other "primitive wrapper") case;
something like:
public final Integer getValue() {
return hasValue() ? Integer.valueOf(getValueInt()) : null;
}
private final native boolean hasValue() /*-{
return this.value == null;
}-*/;
private final native int getValueInt() /*-{
return Number(this.value);
}-*/;
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