static < K , V > RealMapBinder < K , V > newRealMapBinder ( Binder binder , TypeLiteral < K > keyType , Key < V > valueTypeAndAnnotation ) { binder = binder . skipSources ( RealMapBinder . class ) ; TypeLiteral < V > valueType = valueTypeAndAnnotation . getTypeLiteral ( ) ; return newRealMapBinder ( binder , keyType , valueType , valueTypeAndAnnotation . ofType ( mapOf ( keyType , valueType ) ) , RealMultibinder . newRealSetBinder ( binder , valueTypeAndAnnotation . ofType ( entryOfProviderOf ( keyType , valueType ) ) ) ) ; }
since it s an easy way to group a type and an optional annotation type or instance .