No way to extend it to provide other wrapper classes, no. Although you could pretty easily write a wrapper around it (e.g, ScalaOptionBinder) that binds your custom wrapper to something that delegates to Optional<T> (and Optional<Provider<T>, etc.). That'd require users to use your wrapping binder, though. If you don't want to do that, you could use the Guice SPI to analyze all module elements & automatically create new bindings for anything that's an OptionalBinderBinding, delegating to the actual/default values.
The latest push included one commit<https://code.google.com/p/google-guice/source/detail?r=bab9b6082ff7c3aefac2dc8c7de0468fe60fe8f6>that we had to rollback internally (we're not exactly sure what's going wrong, but it caused a few tests in one project to become flaky).. so we could theoretically cut a new beta with the rollback. But hopefully we can figure out what's going wrong, fix it, and cut a better beta. sam On Wed, Apr 2, 2014 at 1:46 PM, Nate Bauernfeind <[email protected] > wrote: > I'm very excited about this; are you going to cut another beta release > anytime soon? > > Is it possible to extend this to use other wrapper classes? I'd like to > add this to the Scala-Guice project for Scala's option class if possible. > On Apr 1, 2014 7:33 PM, "Sam Berlin" <[email protected]> wrote: > >> Ever wanted to: >> 1) Set default binding in a library or framework that users can change? >> 2) Inject something into a library or framework that isn't required, >> but would be better if a user could set it? >> 3) Inject an optional value into a constructor? >> >> OptionalBinder lets you do that. Christian just pushed out some of our >> recent internal changes, including the introduction of OptionalBinder to >> the multibindings extension. >> >> Some example usage: >> >> 1) Setting a default binding that a user can override: >> Library: *OptionalBinder.newOptionalBinder(binder(), Foo.class)* >> * .setDefault().to(DefaultFoo.class);* >> At this point, code can inject '*Foo*' (or *Optional<Foo>)*, and will >> get a *DefaultFoo.* >> >> User: *OptionalBinder.newOptionalBinder(binder(), Foo.class)* >> * .setBinding().to(CustomFoo.class);* >> Once a user calls setBinding(), injections of *Foo* (or >> *Optional<Foo>)* will start providing *CustomFoo* instead. >> >> 2) Setting a binding that isn't required (e.g, no default value), but a >> user can supply. >> Library: *OptionalBinder.newOptionalBinder(binder(), Foo.class);* >> At this point, code *can't* inject *Foo* -- it will fail saying the >> binding isn't supplied. Code *can* (and should) inject *Optional<Foo>*, >> though, and the optional will be absent. >> >> User: *OptionalBinder.newOptionalBinder(binder(), Foo.class)* >> * .setBinding().to(CustomFoo.class);* >> Once a user calls setBinding(), *Optional<Foo>* will be present and >> supply the *CustomFoo*. Also, *Foo* can be directly injected now >> (although only user could should do that, since the user code is the only >> part that guarantees the binding will be there -- library code should still >> inject the* Optional<Foo>*). >> >> Please report back if you have any issues or suggestions for improvement. >> >> Thanks! >> >> sam >> >> -- >> You received this message because you are subscribed to the Google Groups >> "google-guice" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/google-guice. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to the Google Groups > "google-guice" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/google-guice. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "google-guice" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-guice. For more options, visit https://groups.google.com/d/optout.
