Use of a helper function to hide the nested transform

NestedLFTransform.java

public ListenableFuture<List<Item>> getUserItemsWithConfig(User user, ListenableFuture<Config> configFuture) {
  // transform on configFuture and call getItems(user, config)
  ...
}
public List<Item> getItems(User user, Config config) { ... }

ListenableFuture<User> user = getUser(args);
final ListenableFuture<Config> config = getConfig(args);

ListenableFuture<List<Item>> items = Futures.transform(user,
    new AsyncFunction<User, List<Item>>() {
        public ListenableFuture<List<Item>> apply(User user) throws Exception {
          return getUserItemsWithConfig(user, config);
        }
      });