Improved a little (forgot wildcard at provider):
public class GuiceListWildcardTest {
@Test
public void testIt() {
Injector injector = Guice.createInjector( new AbstractModule() {
@Override
protected void configure() {
bind( ( TypeLiteral<List<? extends B>> ) TypeLiteral.get(
Types.listOf( Types.subtypeOf( new TypeLiteral<B<?>>() {
}.getType() ) ) ) ).toProvider( BProvider.class );
}
} );
A a = injector.getInstance( A.class );
assertEquals( a.bs.size(), 2 );
}
public static class A {
private final List<? extends B<?>> bs;
@Inject
public A( @NotNull List<? extends B<?>> bs ) {
this.bs = bs;
}
}
public static class B<T> {
}
public static class BProvider implements Provider<List<? extends B<?>>> {
@Override
public List<? extends B<?>> get() {
return Arrays.<B<?>>asList( new B(), new B() );
}
}
}
Johannes Schneider wrote:
> Hi,
>
> I think someone at Google really understands Generics ;-).
> At the moment I try to understand how Guice manges those things.
>
> Therefore I have created a small sample that works. But I would like to
> have any feedback how that should/could be solved better:
>
>
> Regards,
>
> Johannes
>
>
> public class GuiceListWildcardTest {
> @Test
> public void testIt() {
> Injector injector = Guice.createInjector( new AbstractModule() {
> @Override
> protected void configure() {
> bind( ( TypeLiteral<List<? extends B>> ) TypeLiteral.get(
> Types.listOf( Types.subtypeOf( new TypeLiteral<B<?>>() {
> }.getType() ) ) ) ).toProvider( BProvider.class );
> }
> } );
>
> A a = injector.getInstance( A.class );
> assertEquals( a.bs.size(), 2 );
> }
>
> public static class A {
> private final List<? extends B<?>> bs;
>
> @Inject
> public A( @NotNull List<? extends B<?>> bs ) {
> this.bs = bs;
> }
> }
>
> public static class B<T> {
> }
>
> public static class BProvider implements Provider<List<? extends B>> {
> @Override
> public List<? extends B> get() {
> return Arrays.asList( new B(), new B() );
> }
> }
> }
>
>
> >
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