if (object == this) {
        return true;
      }
      refreshIfEmpty();
      return delegate.equals(object);
    }

    @Override
    public int hashCode() {
      refreshIfEmpty();
      return delegate.hashCode();
    }

    @Override
    public String toString() {
      refreshIfEmpty();
      return delegate.toString();
    }

    Collection<V> getDelegate() {