/**
  * 
  * @param \webignition\CssValidatorOutput\Message\Error $error
  * @return \webignition\CssValidatorOutput\Message\Warning
  */
 public static function fromError(Error $error)
 {
     $warning = new Warning();
     $warning->setContext($error->getContext());
     $warning->setLineNumber($error->getLineNumber());
     $warning->setMessage($error->getMessage());
     $warning->setRef($error->getRef());
     return $warning;
 }