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

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object == this) {
        return true;
      }
      refreshIfEmpty();
      return delegate.equals(object);
    }

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

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

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object == this) {
        return true;
      }
      refreshIfEmpty();
      return delegate.equals(object);
    }

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