@Override
  protected abstract Deque<E> delegate();

  @Override
  public void addFirst(@ParametricNullness E e) {
    delegate().addFirst(e);
  }

  @Override
  public void addLast(@ParametricNullness E e) {
    delegate().addLast(e);
  }

  @Override
  public Iterator<E> descendingIterator() {
    return delegate().descendingIterator();
  }

  @Override
  @ParametricNullness

    final Map<K, V> delegate;

    UnmodifiableIteratorMap(Map<K, V> delegate) {
      this.delegate = delegate;
    }

    @Override
    protected Map<K, V> delegate() {
      return delegate;
    }

    @Override
    public Set<K> keySet() {
      return new ForwardingSet<K>() {
        @Override
        protected Set<K> delegate() {
          return delegate.keySet();
        }

 * or {@link SettingsStaxReader}
 */
@Deprecated
public class SettingsXpp3Reader {

    private final SettingsStaxReader delegate;

    public SettingsXpp3Reader() {
        delegate = new SettingsStaxReader();
    }

    public SettingsXpp3Reader(ContentTransformer contentTransformer) {
        delegate = new SettingsStaxReader(contentTransformer::transform);
    }

    /**

    UnmodifiableListMultimap(ListMultimap<K, V> delegate) {
      super(delegate);
    }

    @Override
    public ListMultimap<K, V> delegate() {
      return (ListMultimap<K, V>) super.delegate();
    }

    @Override
    public List<V> get(@ParametricNullness K key) {
      return Collections.unmodifiableList(delegate().get(key));
    }

    @Override

    protected Object delegate;

    public BaseObject() {}

    public BaseObject(Object delegate, BaseObject parent) {
        this.delegate = requireNonNull(delegate, "delegate cannot be null");
        this.childrenTracking = parent != null ? parent::replace : null;
    }

    public BaseObject(Object delegate, ChildrenTracking parent) {
        this.delegate = requireNonNull(delegate, "delegate cannot be null");

    UnmodifiableListMultimap(ListMultimap<K, V> delegate) {
      super(delegate);
    }

    @Override
    public ListMultimap<K, V> delegate() {
      return (ListMultimap<K, V>) super.delegate();
    }

    @Override
    public List<V> get(@ParametricNullness K key) {
      return Collections.unmodifiableList(delegate().get(key));
    }

    @Override

  /**
   * An SSL socket factory that forwards all calls to a delegate. Override {@link #configureSocket}
   * to customize a created socket before it is returned.
   */
  static class DelegatingSSLSocketFactory extends SSLSocketFactory {
    protected final SSLSocketFactory delegate;

    DelegatingSSLSocketFactory(SSLSocketFactory delegate) {
      this.delegate = delegate;
    }

              delegate().incidentEdges(node).iterator(),
              edge -> EndpointPair.of(delegate(), edge.nodeV(), edge.nodeU()));
        }
      };
    }

    @Override
    public int inDegree(N node) {
      return delegate().outDegree(node); // transpose
    }

    @Override
    public int outDegree(N node) {
      return delegate().inDegree(node); // transpose
    }

    // This allows us to only start up a thread waiting on the delegate future when the first
    // listener is added.
    private final AtomicBoolean hasListeners = new AtomicBoolean(false);

    // The delegate future.
    private final Future<V> delegate;

    ListenableFutureAdapter(Future<V> delegate) {
      this(delegate, defaultAdapterExecutor);
    }

  }

  @Override
  public final boolean isRunning() {
    return delegate.isRunning();
  }

  @Override
  public final State state() {
    return delegate.state();
  }

  /**
   * @since 13.0
   */
  @Override
  public final void addListener(Listener listener, Executor executor) {
    delegate.addListener(listener, executor);
  }

  /**
   * @since 14.0
   */