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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