* Collection} and {@link Iterator} interfaces. The Iterator provided in method {@link #iterator()}
 * is not guaranteed to traverse the elements of the MonitorBasedPriorityBlockingQueue in
 * any particular order. If you need ordered traversal, consider using {@code
 * Arrays.sort(pq.toArray())}. Also, method {@code drainTo} can be used to remove some or

   */
  public static <N> Traverser<N> forGraph(SuccessorsFunction<N> graph) {
    return new Traverser<N>(graph) {
      @Override
      Traversal<N> newTraversal() {
        return Traversal.inGraph(graph);
      }
    };
  }

  /**
   * Creates a new traverser for a directed acyclic graph that has at most one path from the start

   */
  public final FluentIterable<E> cycle() {
    return from(Iterables.cycle(getDelegate()));
  }

  /**
   * Returns a fluent iterable whose iterators traverse first the elements of this fluent iterable,
   * followed by those of {@code other}. The iterators are not polled until necessary.
   *

   */
  public final FluentIterable<E> cycle() {
    return from(Iterables.cycle(getDelegate()));
  }

  /**
   * Returns a fluent iterable whose iterators traverse first the elements of this fluent iterable,
   * followed by those of {@code other}. The iterators are not polled until necessary.
   *

   * Returns an iterator over the elements in this queue in proper sequence. The returned {@code
   * Iterator} is a "weakly consistent" iterator that will never throw {@link
   * ConcurrentModificationException}, and guarantees to traverse elements as they existed upon
   * construction of the iterator, and may (but is not guaranteed to) reflect any modifications
   * subsequent to construction.
   *

   * Returns an iterator over the elements in this queue in proper sequence. The returned {@code
   * Iterator} is a "weakly consistent" iterator that will never throw {@link
   * ConcurrentModificationException}, and guarantees to traverse elements as they existed upon
   * construction of the iterator, and may (but is not guaranteed to) reflect any modifications
   * subsequent to construction.
   *

          @Override
          @Nullable Class<?> getSuperclass(Class<?> type) {
            return type.getSuperclass();
          }
        };

    /** For just classes, we don't have to traverse interfaces. */
    final TypeCollector<K> classesOnly() {
      return new ForwardingTypeCollector<K>(this) {
        @Override
        Iterable<? extends K> getInterfaces(K type) {

        } catch (IOException e) {
            throw UncheckedException.throwAsUncheckedException(e);
        }
    }

    private void removeLeftoverComments(Document document) {
        document.traverse(new NodeVisitor() {
            @Override
            public void head(Node node, int depth) {
                if (node.nodeName().equals("#comment")) {
                    node.remove();
                }

     * be read without locking. Next fields of nodes are immutable (final). All list additions are
     * performed at the front of each bin. This makes it easy to check changes, and also fast to
     * traverse. When nodes would otherwise be changed, new nodes are created to replace them. This
     * works well for hash tables since the bin lists tend to be short. (The average length is less
     * than two.)
     *

     * be read without locking. Next fields of nodes are immutable (final). All list additions are
     * performed at the front of each bin. This makes it easy to check changes, and also fast to
     * traverse. When nodes would otherwise be changed, new nodes are created to replace them. This
     * works well for hash tables since the bin lists tend to be short. (The average length is less
     * than two.)
     *