static getCharacterSetECIByValue(value /*int*/) {
			if (value < 0 || value >= 900) {
				throw new FormatException('incorect value');
			}
			const characterSet = CharacterSetECI.VALUES_TO_ECI.get(value);
			if (undefined === characterSet) {
				throw new FormatException('incorect value');
			}
			return characterSet;
		}
@param value character set ECI value
@return {@code CharacterSetECI} representing ECI of given value, or null if it is legal but
  unsupported
@throws FormatException if ECI value is invalid