public class SwitchableMetadataSource implements ArtifactMetadataSource {
    private ArtifactMetadataSource delegate;

    @Inject
    public SwitchableMetadataSource(@Named("test") ArtifactMetadataSource delegate) {
        this.delegate = delegate;
    }

    public void setDelegate(ArtifactMetadataSource delegate) {
        this.delegate = delegate;
    }

    @Override

  @Override
  protected abstract ConcurrentMap<K, V> delegate();

  @CanIgnoreReturnValue
  @Override
  public @Nullable V putIfAbsent(K key, V value) {
    return delegate().putIfAbsent(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean remove(@Nullable Object key, @Nullable Object value) {
    return delegate().remove(key, value);
  }

  @CanIgnoreReturnValue
  @Override

    delegate.awaitTerminated(timeout, unit);
  }

  interface Cancellable {
    void cancel(boolean mayInterruptIfRunning);

    boolean isCancelled();
  }

  private static final class FutureAsCancellable implements Cancellable {
    private final Future<?> delegate;

    FutureAsCancellable(Future<?> delegate) {
      this.delegate = delegate;
    }

    @Override

        this.filter = filter;
        this.next = advance();
    }

    /**
     * @return next element
     */
    private SmbResource advance() {
        while (this.delegate.hasNext()) {
            final FileEntry n = this.delegate.next();
            if (this.filter == null) {
                try {
                    return adapt(n);
                } catch (final MalformedURLException e) {

        .addEqualityGroup(list2, wrap(list2))
        .testEquals();
  }

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

        .addEqualityGroup(set2, wrap(set2))
        .testEquals();
  }

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

        .asMap();
  }

  @Override
  protected Map<String, Collection<Integer>> makePopulatedMap() {
    ListMultimap<String, Integer> delegate = ArrayListMultimap.create();
    populate(delegate);
    return Multimaps.transformValues(delegate, Functions.<Integer>identity()).asMap();
  }

    implements TestSetGenerator<E> {

  ReserializingTestSetGenerator(TestSetGenerator<E> delegate) {
    super(delegate);
  }

  public static <E> TestSetGenerator<E> newInstance(TestSetGenerator<E> delegate) {
    return new ReserializingTestSetGenerator<>(delegate);
  }

  @Override
  public Set<E> create(Object... elements) {
    return (Set<E>) super.create(elements);
  }

      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) {

    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();
        }