Versions of @ProvidesIntoSet, @ProvidesIntoMap which allow multiple bindings

[gabbard]

Guice provides @ProvidesIntoSet and @ProvidesIntoMap to allow adding items to multibound Sets and Maps using provider methods. However, using this approach, only a single item may be added to the multibound collection for each provider method and for maps the key must be known at compile-time.

It would be helpful if there were annotations like @ProvidesAllIntoSet and @ProvidesAllIntoMap which could indicate the returned collections should be merged with the multibound collections (via addAll or putAll).

My use case for this is that the map bindings I wish to create are themselves determined by another injected map. This also has the advantage of allowing the use of provider methods for Map multibindings with non-String keys.

[lukesandberg]

this is a good idea, but it would require a somewhat large redesign of multibinders

e.g. it would require possibly breaking changes to the multibinder spi... so +1