protected function validate($value)
{
$valueArray = explode(".", $value);
if (count($valueArray) > 1) {
array_pop($valueArray);
}
parent::validate(implode(".", $valueArray));
if (!preg_match("/^([a-zA-Z0-9:_-]+\\.)?([a-zA-Z0-9:_-]+\\.)?[a-zA-Z0-9:_-]+\$/is", $value)) {
throw new ErrorException("Invalid column-specifier given: '{$value}'!");
}
}
