dagger.multibindings

Annotation Type Multibinds

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

Annotates abstract module methods that declare multibindings.

You can declare that a multibound set or map is bound by annotating an abstract module method that returns the set or map you want to declare with @Multibinds.

You do not have to use @Multibinds for sets or maps that have at least one contribution, but you do have to declare them if they may be empty.

    @Module abstract class MyModule {
      @Multibinds Set<Foo> aSet();
      @Multibinds @MyQualifier Set<Foo> aQualifiedSet();
      @Multibinds Map<String, Foo> aMap();
      @Multibinds @MyQualifier Map<String, Foo> aQualifiedMap();

      @Provides
      static Object usesMultibindings(Set<Foo> set, @MyQualifier Map<String, Foo> map) {
       return …
     }
   }

A given set or map multibinding can be declared any number of times without error. Dagger never implements or calls any @Multibinds methods.

See Also:

Multibindings