As long as JIT bindings are enabled, you can do something like this:
public class TypeTokenFactory<T> {
@Inject TypeLiteral<T> typeLiteral;
public TypeToken<T> create() {
return (TypeToken<T>) TypeToken.of(typeLiteral.getType());
}
}
Then you can inject a TypeTokenFactory<List<String>> or whatever. But you
can't make TypeToken<T> automatically injectable for all T.
On Friday, 15 May 2015 02:02:29 UTC-4, [email protected] wrote:
>
> Suppose that you have a TypeLiteral analogue in some other library, which
> can be easily constructed from TypeLiteral via exporting TypeLiteral's
> getType() to the analogue's TypeLiteral.of() counterpart (or custom
> subclassing shenanigans). Examples of this may include
> org.apache.commons.lang3.reflect.TypeLiteral (or the Typed interface...) or
> com.fasterxml.jackson.databind.TypeReference (though ultimately the goal is
> the non-generic JavaType...). The common thing is that these objects have
> only one dependency, and that is on a TypeLiteral. The question is that,
> given that the only dependency is TypeLiteral, is it possible to define a
> "broadly-applicable" binding, or will I be forced to enumerate types? And
> when I mean "broadly-applicable", it could be either an automatic injection
> (similar to how TypeLiteral itself is injected) restricted to the types
> known by the injector, or "any type" including those that the injector does
> not (for example, via injector.getInstance(new TypeLiteral<Foobar>() {}),
> where Foobar was not used in the construction of the injector).
>
> Also related: suppose in an assisted injection context TypeLiteral is your
> only unassisted dependency, like the following:
>
> public interface TypedObjectFactory<T> {
> public TypedObject<T> build(T object);
> }
>
> public class TypedObject<T> {
> @Inject
> public TypedObject(TypeLiteral<T> type, @Assisted T object) { ... }
> }
>
> Is it possible to have a "broadly-applicable" installation (in this case,
> install FactoryModuleBuilder in broad terms like the above), or will I be
> forced to enumerate types?
>
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