Hi,
That's a good question and I am curious about the proper way to handle
it. One way I came up with for handling it is this.:
class SpecializedObjectWrapper<T extends HasValue<String> &
HasBlurHandlers> extends ObjectWrapper<T>
{
public SpecializedObjectWrapper(T v)
{
super(v);
}
}
class ObjectWrapper<T>
{
public ObjectWrapper(T value)
{
this.value = value;
}
public T getValue() { return value; }
private T value;
};
Then use:
SpecializedObjectWrapper<?> getUsernameTextBox()
for your method.
This seems a bit bulky to me, although one can shared the
ObjectWrapper class and create a new SpecializedObjectWrapper for each
unique return type. I am interested if there is a more elegant
solutions.
On Nov 10, 12:20 pm, "P.G.Taboada" <[email protected]> wrote:
> Hi,
>
> I am running into Java compilation issues.
> Example:
>
> public class LoginPresenter {
>
> public interface Display {
>
> <T extends HasValue<String> & HasBlurHandlers> T
> getUsernameTextBox
> ();
>
> HasValue<String> getPasswordTextBox();
>
> HasValue<String> getErrorMessageBox();
>
> HasClickHandlers getLoginButton();
> }
>
> // ...
>
> }
>
> While I can define a Display that returns a TextBox, I can't use the
> getUsernameTextBox without doing the assignment type inference against
> a concrete something implementing both interfaces in my presenter.
>
> How do you handle this?
>
> brgds,
>
> Papick
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