}

  private static double ensurePositive(double value) {
    if (value > 0.0) {
      return value;
    } else {
      return Double.MIN_VALUE;
    }
  }

  private static double ensureInUnitRange(double value) {
    if (value >= 1.0) {
      return 1.0;
    }
    if (value <= -1.0) {
      return -1.0;
    }
    return value;
  }

  // Serialization helpers

      // non-finite inputs will have sumOfProductsOfDeltas = NaN, so non-finite values will result
      // in NaN naturally.
      sumOfProductsOfDeltas +=
          values.sumOfProductsOfDeltas()
              + (values.xStats().mean() - xStats.mean())
                  * (values.yStats().mean() - yStats.mean())
                  * values.count();
    }
    yStats.addAll(values.yStats());
  }

        if (value == null || (value instanceof String && ((String) value).isEmpty())) {
            String msg = "Cannot register null or empty query: name=" + name + " value=" + value;
            throw new InvalidQueryRegisteredException(msg);
        }
    }

    protected void checkEsInvalidQueryCollection(String name, Collection<?> values) {

        if (value == null || (value instanceof String && ((String) value).isEmpty())) {
            String msg = "Cannot register null or empty query: name=" + name + " value=" + value;
            throw new InvalidQueryRegisteredException(msg);
        }
    }

    protected void checkEsInvalidQueryCollection(String name, Collection<?> values) {

  }

  /**
   * Returns a hash code for {@code value}; equal to the result of invoking {@code ((Boolean)
   * value).hashCode()}.
   *
   * <p><b>Java 8+ users:</b> use {@link Boolean#hashCode(boolean)} instead.
   *
   * @param value a primitive {@code boolean} value
   * @return a hash code for the value
   */
  public static int hashCode(boolean value) {
    return value ? 1231 : 1237;
  }

  /**

  }

  /**
   * Returns a hash code for {@code value}; equal to the result of invoking {@code ((Boolean)
   * value).hashCode()}.
   *
   * <p><b>Java 8+ users:</b> use {@link Boolean#hashCode(boolean)} instead.
   *
   * @param value a primitive {@code boolean} value
   * @return a hash code for the value
   */
  public static int hashCode(boolean value) {
    return value ? 1231 : 1237;
  }

  /**

                              to a set of values. Valid operators are In, NotIn, Exists
                              and DoesNotExist.
                            type: string
                          values:
                            description: values is an array of string values. If the
                              operator is In or NotIn, the values array must be non-empty.

  // MultimapPutTester tests non-duplicate values, but ignores ordering

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAddsValueAtEnd() {
    for (K key : sampleKeys()) {
      for (V value : sampleValues()) {
        resetContainer();

        List<V> values = multimap().get(key);
        List<V> expectedValues = copyToList(values);

        assertTrue(multimap().put(key, value));
        expectedValues.add(value);

    }

    protected boolean isOccurrence(final String value) {
        return "allintitle".equals(value) || "allinurl".equals(value);
    }

    protected String escape(final String q, final String... values) {
        String value = q;
        for (final String s : values) {
            value = value.replace(s, "\\" + s);
        }
        return value;
    }

	// ErrInvalidDB invalid db
	ErrInvalidDB = errors.New("invalid db")
	// ErrInvalidValue invalid value
	ErrInvalidValue = errors.New("invalid value, should be pointer to struct or slice")
	// ErrInvalidValueOfLength invalid values do not match length
	ErrInvalidValueOfLength = errors.New("invalid association values, length doesn't match")
	// ErrPreloadNotAllowed preload is not allowed when count is used