/**
   * For documenting collections that support no optional features, such as {@link
   * java.util.Collections#emptySet}
   */
  NONE;

  private final Set<Feature<? super Collection>> implied;

  CollectionFeature(Feature<? super Collection>... implied) {
    this.implied = Helpers.copyToSet(implied);
  }

  @Override
  public Set<Feature<? super Collection>> getImpliedFeatures() {
    return implied;

      implements TestMapGenerator<String, Collection<Integer>> {

    @Override
    public SampleElements<Entry<String, Collection<Integer>>> samples() {
      return new SampleElements<>(
          mapEntry("one", collectionOf(10000)),
          mapEntry("two", collectionOf(-2000)),
          mapEntry("three", collectionOf(300)),
          mapEntry("four", collectionOf(-40)),
          mapEntry("five", collectionOf(5)));

    private final Collection<String> scopesToCollectForCurrentProject;

    private final Collection<String> scopesToResolveForCurrentProject;

    private final Collection<String> scopesToCollectForAggregatedProjects;

    private final Collection<String> scopesToResolveForAggregatedProjects;

    private volatile Collection<?> lastDependencyArtifacts = Collections.emptyList();

      return Sets.unmodifiableNavigableSet((NavigableSet<E>) collection);
    } else {
      return Collections.unmodifiableSortedSet((SortedSet<E>) collection);
    }
  }

  @Override
  Collection<V> wrapCollection(@ParametricNullness K key, Collection<V> collection) {
    if (collection instanceof NavigableSet) {
      return new WrappedNavigableSet(key, (NavigableSet<V>) collection, null);
    } else {

      return Sets.unmodifiableNavigableSet((NavigableSet<E>) collection);
    } else {
      return Collections.unmodifiableSortedSet((SortedSet<E>) collection);
    }
  }

  @Override
  Collection<V> wrapCollection(@ParametricNullness K key, Collection<V> collection) {
    if (collection instanceof NavigableSet) {
      return new WrappedNavigableSet(key, (NavigableSet<V>) collection, null);
    } else {

   */
  protected AbstractSetMultimap(Map<K, Collection<V>> map) {
    super(map);
  }

  @Override
  abstract Set<V> createCollection();

  @Override
  Set<V> createUnmodifiableEmptyCollection() {
    return Collections.emptySet();
  }

  @Override
  <E extends @Nullable Object> Collection<E> unmodifiableCollectionSubclass(
      Collection<E> collection) {
    return Collections.unmodifiableSet((Set<E>) collection);
  }

 * limitations under the License.
 */

/**
 * Collection interfaces and implementations, and other utilities for collections. This package is a
 * part of the open-source <a href="https://github.com/google/guava">Guava</a> library.
 *
 * <p>The classes in this package include:
 *
 * <h2>Immutable collections</h2>
 *
 * These are collections whose contents will never change. They also offer a few additional

  }

  @Override
  public boolean containsAll(Collection<?> collection) {
    return delegate().containsAll(collection);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean addAll(Collection<? extends E> collection) {
    return delegate().addAll(collection);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean retainAll(Collection<?> collection) {
    return delegate().retainAll(collection);
  }

      Map<Element, Element> create(Collection<Element> keys) {
        return Collections.unmodifiableMap(Hash.create(keys));
      }
    },
    SyncHM {
      @Override
      Map<Element, Element> create(Collection<Element> keys) {
        return Collections.synchronizedMap(Hash.create(keys));
      }
    },
    Tree {
      @Override
      Map<Element, Element> create(Collection<Element> keys) {

  }

  protected Collection<Method> suppressForConcurrentLinkedDeque() {
    return Collections.emptySet();
  }

  protected Collection<Method> suppressForConcurrentLinkedQueue() {
    return Collections.emptySet();
  }

  protected Collection<Method> suppressForLinkedBlockingDeque() {
    return Collections.emptySet();
  }

  protected Collection<Method> suppressForLinkedBlockingQueue() {
    return Collections.emptySet();
  }