return null;
    }

    @Override
    public int xgetNestLevel() {
        return 0;
    }

    @Override
    public int xgetNextNestLevel() {
        return 0;
    }

    @Override
    public boolean isBaseQuery() {
        return false;
    }

    @Override
    public String xgetForeignPropertyName() {
        return null;
    }

    @Override

            }
          };
        }
      }

      @Override
      public int size() {
        return predecessorCount;
      }

      @Override
      public boolean contains(@Nullable Object obj) {
        return isPredecessor(adjacentNodeValues.get(obj));
      }
    };
  }

  @Override
  public Set<N> successors() {
    return new AbstractSet<N>() {

     *
     * @return The list of search result documents
     */
    public List<Map<String, Object>> getDocumentItems() {
        return documentItems;
    }

    /**
     * Gets the facet response containing aggregated search facets.
     *
     * @return The facet response
     */
    public FacetResponse getFacetResponse() {
        return facetResponse;
    }

    /**

    }

    @Override
    public int hashCode() {
      return 1;
    }

    private Object writeReplace() {
      return new OtherForm();
    }

    private static class OtherForm implements Serializable {
      @Override
      public boolean equals(@Nullable Object other) {
        return (other instanceof ObjectWhichIsEqualButChangesClass || other instanceof OtherForm);
      }

      @Override

    }
    return (Ordering<@Nullable S>) result;
  }

  @Override
  @SuppressWarnings("unchecked") // TODO(kevinb): the right way to explain this??
  public <S extends Comparable<?>> Ordering<S> reverse() {
    return (Ordering<S>) ReverseNaturalOrdering.INSTANCE;
  }

  // preserving singleton-ness gives equals()/hashCode() for free
  private Object readResolve() {
    return INSTANCE;
  }

  @Override

     * @param coordinatesString the string having "standard" coordinates.
     * @return an {@code ArtifactCoordinates}, never {@code null}
     * @throws IllegalArgumentException if {@code session} is null or invalid
     */
    @Nonnull
    default ArtifactCoordinates create(@Nonnull Session session, @Nonnull String coordinatesString) {
        return create(ArtifactCoordinatesFactoryRequest.build(session, coordinatesString));
    }

    try {
      assertFalse("add(present) should return false or throw", collection.add(e0()));
    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

  @CollectionFeature.Require(
      value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES},
      absent = RESTRICTS_ELEMENTS)
  public void testAdd_nullSupported() {
    assertTrue("add(null) should return true", collection.add(null));
    expectAdded((E) null);

    try {
      assertFalse("add(present) should return false or throw", collection.add(e0()));
    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

  @CollectionFeature.Require(
      value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES},
      absent = RESTRICTS_ELEMENTS)
  public void testAdd_nullSupported() {
    assertTrue("add(null) should return true", collection.add(null));
    expectAdded((E) null);

            return "q,lang";
        }

        @Override
        public Integer getCookieSearchParameterMaxLengthAsInteger() {
            return 4096;
        }

        @Override
        public String getCookieSearchParameterName() {
            return "FESS_SEARCH_PARAM";
        }

        @Override
        public String getCookieSearchParameterHttpOnly() {
            return "true";
        }

   * @throws NullPointerException if any element in the stream is {@code null}.
   * @return {@code Optional.of(onlyElement)} if the stream has exactly one element (must not be
   *     {@code null}) and returns {@code Optional.empty()} if it has none.
   */
  @SuppressWarnings("unchecked")
  public static <T> Collector<T, ?, Optional<T>> toOptional() {
    return (Collector) TO_OPTIONAL;
  }