*
   * @since 9.0
   */
  public abstract static class SimpleForwardingListenableFuture<V extends @Nullable Object>
      extends ForwardingListenableFuture<V> {
    private final ListenableFuture<V> delegate;

    protected SimpleForwardingListenableFuture(ListenableFuture<V> delegate) {
      this.delegate = Preconditions.checkNotNull(delegate);
    }

    @Override

public class DefaultEvent implements Event {
    private final InternalMavenSession session;
    private final ExecutionEvent delegate;
    private final EventType eventType;

    public DefaultEvent(InternalMavenSession session, ExecutionEvent delegate, EventType eventType) {
        this.session = session;
        this.delegate = delegate;
        this.eventType = eventType;
    }

    @Override
    public EventType getType() {

    // 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);
    }

    private final MetadataStaxReader delegate;

    /**
     * Default constructor
     */
    public MetadataXpp3Reader() {
        delegate = new MetadataStaxReader();
    }

    /**
     * Constructor with ContentTransformer
     *
     * @param contentTransformer a transformer
     */
    public MetadataXpp3Reader(ContentTransformer contentTransformer) {

  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() {

    // --------------------------/

    private final MavenStaxWriter delegate = new MavenStaxWriter();

    // -----------/
    // - Methods -/
    // -----------/

    public MavenXpp3Writer() {
        this(false);
    }

    protected MavenXpp3Writer(boolean addLocationInformation) {
        delegate.setAddLocationInformation(addLocationInformation);
    }

    /**

  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);
  }

    @ParametricNullness final K key;
    Collection<V> delegate;
    final @Nullable WrappedCollection ancestor;
    final @Nullable Collection<V> ancestorDelegate;

    WrappedCollection(
        @ParametricNullness K key, Collection<V> delegate, @Nullable WrappedCollection ancestor) {
      this.key = key;
      this.delegate = delegate;
      this.ancestor = ancestor;

    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() {

    this.delegate = delegate;
    this.delegateList = delegateList;
  }

  RegularImmutableAsList(ImmutableCollection<E> delegate, Object[] array) {
    this(delegate, asImmutableList(array));
  }

  @Override
  ImmutableCollection<E> delegateCollection() {
    return delegate;
  }

  ImmutableList<? extends E> delegateList() {