new long[] {},
            new long[] {MIN_VALUE},
            new long[] {MIN_VALUE, MIN_VALUE},
            new long[] {MIN_VALUE, (long) 1},
            new long[] {(long) 1},
            new long[] {(long) 1, MIN_VALUE},
            new long[] {MAX_VALUE, MAX_VALUE - (long) 1},
            new long[] {MAX_VALUE, MAX_VALUE},
            new long[] {MAX_VALUE, MAX_VALUE, MAX_VALUE});

            new long[] {},
            new long[] {MIN_VALUE},
            new long[] {MIN_VALUE, MIN_VALUE},
            new long[] {MIN_VALUE, (long) 1},
            new long[] {(long) 1},
            new long[] {(long) 1, MIN_VALUE},
            new long[] {MAX_VALUE, MAX_VALUE - (long) 1},
            new long[] {MAX_VALUE, MAX_VALUE},
            new long[] {MAX_VALUE, MAX_VALUE, MAX_VALUE});

    checkArgument(values.hasNext(), "Cannot take mean of 0 values");
    long count = 1;
    double mean = checkFinite(values.next().doubleValue());
    while (values.hasNext()) {
      double value = checkFinite(values.next().doubleValue());
      count++;
      // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
      mean += (value - mean) / count;
    }
    return mean;

  private static final class RepeatedStringValueOfFunction
      implements Function<Integer, List<String>> {
    @Override
    public List<String> apply(Integer from) {
      String value = String.valueOf(from);
      return ImmutableList.of(value, value);
    }
  }

  public void testTransformAndConcat() {
    List<Integer> input = asList(1, 2, 3);
    Iterable<String> result =

        if (crudMode != expectedMode) {
            throwValidationError(messages -> {
                messages.addErrorsCrudInvalidMode(GLOBAL, String.valueOf(expectedMode), String.valueOf(crudMode));
            }, this::asListHtml);
        }
    }

    public static void validateAttributes(final Map<String, String> attributes, final Consumer<VaMessenger<FessMessages>> throwError) {

        if (crudMode != expectedMode) {
            throwValidationError(messages -> {
                messages.addErrorsCrudInvalidMode(GLOBAL, String.valueOf(expectedMode), String.valueOf(crudMode));
            }, this::asListHtml);
        }
    }

    // ===================================================================================

        if (crudMode != expectedMode) {
            throwValidationError(messages -> {
                messages.addErrorsCrudInvalidMode(GLOBAL, String.valueOf(expectedMode), String.valueOf(crudMode));
            }, this::asListHtml);
        }
    }

    // ===================================================================================

        if (crudMode != expectedMode) {
            throwValidationError(messages -> {
                messages.addErrorsCrudInvalidMode(GLOBAL, String.valueOf(expectedMode), String.valueOf(crudMode));
            }, this::asListHtml);
        }
    }

    // ===================================================================================

        if (crudMode != expectedMode) {
            throwValidationError(messages -> {
                messages.addErrorsCrudInvalidMode(GLOBAL, String.valueOf(expectedMode), String.valueOf(crudMode));
            }, this::asListHtml);
        }
    }

    // ===================================================================================

  }

  private static final class NullFriendlyComparator<T> implements Comparator<T>, Serializable {
    @Override
    public int compare(T left, T right) {
      return String.valueOf(left).compareTo(String.valueOf(right));
    }
  }