Website documentation about using dagger

[ahmed-hamdy90]

Injecting Provider has the possibility of creating confusing code, and may be a design smell of mis-scoped or mis-structured objects in your graph. Often you will want to use a Factory or a Lazy or re-organize the lifetimes and structure of your code to be able to just inject a T. Injecting Provider can, however, be a life saver in some cases. A common use is when you must use a legacy architecture that doesn't line up with your object's natural lifetimes (e.g. servlets are singletons by design, but only are valid in the context of request-specfic data).

I think Factory<T> must be Provider<T>

[JakeWharton]

This is saying that manually-written factory or lazy are alternatives to investigate to ultimately allow you to inject a T.