public function filterByVolume($volume = null, $comparison = null)
    {
        if (null === $comparison) {
            if (is_array($volume)) {
                $comparison = Criteria::IN;
            } elseif (preg_match('/[\%\*]/', $volume)) {
                $volume = str_replace('*', '%', $volume);
                $comparison = Criteria::LIKE;
            }
        }

        return $this->addUsingAlias(ReferenceTableMap::COL_VOLUME, $volume, $comparison);
    }