/**
* Check the validity of the expression with regard to the data model
* and the query in which it is used
*
* @param ModelReflection $oModelReflection MetaModel to consider
* @param array $aClasses Flat list of classes
* @return string the lowest common ancestor amongst classes, null if none has been found
* @throws Exception
*/
public static function GetLowestCommonAncestor(ModelReflection $oModelReflection, $aClasses)
{
$sAncestor = null;
foreach ($aClasses as $sClass) {
if (is_null($sAncestor)) {
// first loop
$sAncestor = $sClass;
} elseif ($sClass == $sAncestor) {
// remains the same
} elseif ($oModelReflection->GetRootClass($sClass) != $oModelReflection->GetRootClass($sAncestor)) {
$sAncestor = null;
break;
} else {
$sAncestor = self::LowestCommonAncestor($oModelReflection, $sAncestor, $sClass);
}
}
return $sAncestor;
}
