How to use

as

method

in

it.tidalwave.northernwind.core.model.Content

 /* visible for testing */ void onOpenSite (final @ListensTo @Nonnull OpenSiteEvent event)
  {
   log.debug("onOpenSite({})", event);
   final ResourceFile root = event.getFileSystem().findFileByPath(ROOT_DOCUMENT_PATH);
   final Content rootContent = modelFactory.createContent().withFolder(root).build();
   presentation.populate(rootContent.as(Presentable).createPresentationModel());
   presentation.expandFirstLevel();
   messageBus.publish(emptySelectionEvent());
  }
}