validateFormatLength() public static method

Validates provided format length and throws exception if value is not allowed.
public static validateFormatLength ( string $formatLength ) : void
$formatLength string
return void
 /**
  * Formats dateTime with format string for date and time defined in CLDR for
  * particular locale.
  *
  * First date and time are formatted separately, and then dateTime format
  * from CLDR is used to place date and time in correct order.
  *
  * @param \DateTimeInterface $dateTime PHP object representing particular point in time
  * @param Locale $locale
  * @param string $formatLength One of DatesReader FORMAT_LENGTH constants
  * @return string Formatted date and time
  * @api
  */
 public function formatDateTime(\DateTimeInterface $dateTime, Locale $locale, $formatLength = DatesReader::FORMAT_LENGTH_DEFAULT)
 {
     DatesReader::validateFormatLength($formatLength);
     return $this->doFormattingWithParsedFormat($dateTime, $this->datesReader->parseFormatFromCldr($locale, DatesReader::FORMAT_TYPE_DATETIME, $formatLength), $this->datesReader->getLocalizedLiteralsForLocale($locale));
 }
 /**
  * Parses dateTime with format string for date and time defined in CLDR for
  * particular locale.
  *
  * @param string $dateAndTimeToParse Date and time to be parsed
  * @param I18n\Locale $locale
  * @param string $formatLength One of: full, long, medium, short, or 'default' in order to use default length from CLDR
  * @param boolean $strictMode Work mode (strict when TRUE, lenient when FALSE)
  * @return mixed Array of parsed date and time elements, FALSE on failure
  */
 public function parseDateAndTime($dateAndTimeToParse, I18n\Locale $locale, $formatLength = DatesReader::FORMAT_LENGTH_DEFAULT, $strictMode = true)
 {
     DatesReader::validateFormatLength($formatLength);
     return $this->doParsingWithParsedFormat($dateAndTimeToParse, $this->datesReader->parseFormatFromCldr($locale, DatesReader::FORMAT_TYPE_DATETIME, $formatLength), $this->datesReader->getLocalizedLiteralsForLocale($locale), $strictMode);
 }