On 22/03/2013, at 12:07 AM, Adam Murdoch <adam.murd...@gradleware.com> wrote:
>
>
>
> On 22 March 2013 09:09, Luke Daley <luke.da...@gradleware.com> wrote:
> Hi,
>
> DomainObjectCollection<T> {
> <S extends T> DomainObjectCollection<S> withType(Class<S>) {}
> }
>
> This generic signature is not right. It doesn't allow creating a filtered set
> by an interface. My use case was…
>
> tasks.withType(JavaForkOptions) {
>
> }
>
> But this doesn't work.
>
> Do we want to fix this? If so, how the hell do we do so in a backwards
> compatible way?
>
> We can just remove the `extends T` bound on `S`. It's source and binary
> backwards-compatible.
It's not quite that easy unfortunately, as sub classes specialise these methods
to strongly type the returned container type which demands the argument be a
subtype of the element type:
https://github.com/gradle/gradle/blob/master/subprojects/core/src/main/groovy/org/gradle/api/tasks/TaskCollection.java#L55
--
Luke Daley
Principal Engineer, Gradleware
http://gradleware.com
Join me at the Gradle Summit 2013, June 13th and 14th in Santa Clara, CA:
http://www.gradlesummit.com
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