Qualifier

A qualifier annotation can be used to qualify or otherwise disambiguate a type on a dependency graph. This is useful for primarily two situations:

1. You have two of the same type on the graph and need to disambiguate them.

2. You have a common type (such as a primitive) on the graph that you want to add more explicit semantics to.

Any annotation annotated with Qualifier becomes a "qualifier" annotation that will be recognized and respected by the Metro compiler plugin.

@Qualifier
annotation class QualifiedInt

@DependencyGraph
interface AppGraph {
  val int: Int
  @QualifiedInt val qualifiedInt: Int
}

Metro's runtime contains two out-of-the box qualifiers for common use: Named and ForScope.