ViewTypeLookup.java

class NestedAdapterWrapper {
    @NonNull
    private final ViewTypeStorage.ViewTypeLookup mViewTypeLookup;

    NestedAdapterWrapper(
        Adapter<ViewHolder> adapter,
        final Callback callback,
        ViewTypeStorage viewTypeStorage,
        StableIdStorage.StableIdLookup stableIdLookup
    ) {
        ...
        mViewTypeLookup = viewTypeStorage.createViewTypeWrapper(this);
        ...
    }
}