/**
* Factory create header from string.
*
* @param string $headerLine
*
* @return $this
*/
public static function fromString($headerLine)
{
if (null === ($headerName = static::getHeaderName())) {
GenericHeader::assertEmptyHeaderFieldName($headerName);
}
list($fieldName, $fieldValue) = GenericHeader::splitHeaderLine($headerLine);
return static::create($fieldName, $fieldValue);
}
/**
* Constructor.
*
* @param DateTime|null $date
*/
public function __construct(DateTime $date = null)
{
GenericHeader::assertEmptyHeaderFieldName(static::$headerName);
$this->setDate(null !== $date ? $date : new DateTime());
}
