/**
* Returns normalization factor for specified documents
*
* @param integer $id
* @param string $fieldName
* @return float
*/
public function norm($id, $fieldName)
{
$fieldNum = $this->getFieldNum($fieldName);
if (!$this->_fields[$fieldNum]->isIndexed) {
return null;
}
if (!isset($this->_norms[$fieldNum])) {
$this->_loadNorm($fieldNum);
}
return Similarity::decodeNorm(ord($this->_norms[$fieldNum][$id]));
}
