* @return true if updated, false otherwise
     */
    public boolean isUpdated() {
        return newInput != null;
    }

    /**
     * Checks if this item has been deleted.
     * @return true if deleted, false otherwise
     */
    public boolean isDeleted() {
        return isUpdated() && newInput.length() == 0;
    }

    @Override
    public int hashCode() {

  private InvalidatableSet(
      Set<E> delegate, Supplier<Boolean> validator, Supplier<String> errorMessage) {
    this.delegate = delegate;
    this.validator = validator;
    this.errorMessage = errorMessage;
  }

  // Override hashCode() to access delegate directly (so that it doesn't trigger the validate() call
  // via delegate()); it seems inappropriate to throw ISE on this method.
  @Override
  public int hashCode() {

              @Override
              public Deque<?> apply(Deque delegate) {
                return wrap((Deque<?>) delegate);
              }
            });
  }

  private static <T> Deque<T> wrap(Deque<T> delegate) {
    return new ForwardingDeque<T>() {
      @Override
      protected Deque<T> delegate() {
        return delegate;
      }
    };
  }

   * constructed {@link LoadingCache} as the delegate.
   *
   * @since 10.0
   */
  public abstract static class SimpleForwardingLoadingCache<K, V>
      extends ForwardingLoadingCache<K, V> {
    private final LoadingCache<K, V> delegate;

    protected SimpleForwardingLoadingCache(LoadingCache<K, V> delegate) {
      this.delegate = Preconditions.checkNotNull(delegate);
    }

    @Override

      return Iterators.transform(entries, UnmodifiableEntry::new);
    }

    private UnmodifiableEntry(Entry<K, V> delegate) {
      this.delegate = checkNotNull(delegate);
    }

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

    @Override
    @ParametricNullness
    public V setValue(@ParametricNullness V value) {

    implements SortedMultiset<E> {
  UnmodifiableSortedMultiset(SortedMultiset<E> delegate) {
    super(delegate);
  }

  @Override
  protected SortedMultiset<E> delegate() {
    return (SortedMultiset<E>) super.delegate();
  }

  @Override
  public Comparator<? super E> comparator() {
    return delegate().comparator();
  }

  @Override
  SortedSet<E> createElementSet() {

  private final ListenableFuture<V> delegate;

  ForwardingFluentFuture(ListenableFuture<V> delegate) {
    this.delegate = checkNotNull(delegate);
  }

  @Override
  public void addListener(Runnable listener, Executor executor) {
    delegate.addListener(listener, executor);
  }

  @Override
  public boolean cancel(boolean mayInterruptIfRunning) {
    return delegate.cancel(mayInterruptIfRunning);
  }

    private final ExecutionListener delegate;

    EventSpyExecutionListener(EventSpyDispatcher dispatcher, ExecutionListener delegate) {
        this.dispatcher = dispatcher;
        this.delegate = delegate;
    }

    @Override
    public void projectDiscoveryStarted(ExecutionEvent event) {
        dispatcher.onEvent(event);
        delegate.projectDiscoveryStarted(event);
    }

    @Override

need it so that empty directory does not get deleted...

  }

  private final class BiMapEntry extends ForwardingMapEntry<K, V> {
    private final Entry<K, V> delegate;

    BiMapEntry(Entry<K, V> delegate) {
      this.delegate = delegate;
    }

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

    @Override
    public V setValue(V value) {
      checkValue(value);