@Documented
 @Target(value=METHOD)
 @Retention(value=RUNTIME)
public @interface ProvidesIntoOptional

Annotates methods of a Module to add items to a Multibinder. The method's return type and binding annotation determines what Optional this will contribute to. For example,

  @ProvidesIntoOptional(DEFAULT)
  @Named("url")
 String provideFooUrl(FooManager fm) { returm fm.getUrl(); }

  @ProvidesIntoOptional(ACTUAL)
  @Named("url")
 String provideBarUrl(BarManager bm) { return bm.getUrl(); }
 

will set the default value of @Named("url") Optional<String> to foo's URL, and then override it to bar's URL.