checkNotNull(nodeToChildrenFunction);
    return new TreeTraverser<T>() {
      @Override
      public Iterable<T> children(T root) {
        return nodeToChildrenFunction.apply(root);
      }
    };
  }

  /** Returns the children of the specified node. Must not contain null. */
  public abstract Iterable<T> children(T root);

  /**

      return delegate;
    }
    return new UnmodifiableSortedSetMultimap<>(delegate);
  }

  /**
   * Returns a synchronized (thread-safe) {@code ListMultimap} backed by the specified multimap.
   *
   * <p>You must follow the warnings described in {@link #synchronizedMultimap}.
   *
   * @param multimap the multimap to be wrapped
   * @return a synchronized view of the specified multimap

      return delegate;
    }
    return new UnmodifiableSortedSetMultimap<>(delegate);
  }

  /**
   * Returns a synchronized (thread-safe) {@code ListMultimap} backed by the specified multimap.
   *
   * <p>You must follow the warnings described in {@link #synchronizedMultimap}.
   *
   * @param multimap the multimap to be wrapped
   * @return a synchronized view of the specified multimap

   * all values is returned.
   *
   */
  CacheStats stats();

  /**
   * Returns a view of the entries stored in this cache as a thread-safe map. Modifications made to
   * the map directly affect the cache.
   *
   * <p>Iterators from the returned map are at least <i>weakly consistent</i>: they are safe for

            protected SmbResource adapt(FileEntry e) {
                return mockResource1;
            }
        };

        // When/Then
        assertFalse(iterator.hasNext(), "Should not have next when advance returns null");
        // The iterator returns null when no elements, doesn't throw exception
        assertNull(iterator.next(), "Should return null when no next element");
    }

    /**

            return true;
        }
        return false;
    }

    @Override
    public int hashCode() {
        return java.util.Objects.hash(loc, changefreq, lastmod, priority);
    }

    /**
     * Returns a string representation of this SitemapUrl.
     * @return A string representation.
     */
    @Override
    public String toString() {

    }

    /**
     * Returns the {@link Class} of the target.
     *
     * @return {@link Class} of the target
     */
    public Class<?> getTargetClass() {
        return targetClass;
    }

    /**
     * Returns the method name.
     *
     * @return Method name
     */
    public String getMethodName() {
        return methodName;
    }

    /**

    }

    /**
     * Returns a message code.
     *
     * @return message code
     */
    public String getMessageCode() {
        return messageCode;
    }

    /**
     * Returns arguments of a message
     *
     * @return array of arguments
     */
    public Object[] getArgs() {
        return args;
    }

    @Override

  }

  /** Returns the number of pairs in the dataset. */
  public long count() {
    return xStats.count();
  }

  /** Returns the statistics on the {@code x} values alone. */
  public Stats xStats() {
    return xStats;
  }

  /** Returns the statistics on the {@code y} values alone. */
  public Stats yStats() {
    return yStats;
  }

  /**

     * @return {@code true} if this range contains the specified version, {@code false} otherwise
     */
    boolean contains(@Nonnull Version version);

    /**
     * Returns the upper boundary of this range, or {@code null} if none.
     */
    @Nullable
    Boundary getUpperBoundary();

    /**
     * Returns the lower boundary of this range, or {@code null} if none.
     */