/**
* @param $formula
* @param $table
* @param $typeLeft
* @param $typeRight
* @return SFM_Relation
* @throws SFM_Exception
*/
protected function parseRelation($formula, $table, $typeLeft, $typeRight)
{
$sideLeft = $this->factory->relationSide();
$sideRight = $this->factory->relationSide();
$separator = $typeLeft . self::TYPE_SEPARATOR . $typeRight;
$arr = explode(" {$separator} ", $formula);
if (count($arr) == 2) {
$arr = array_map('trim', $arr);
$arrLeftData = explode('.', $arr[0]);
$arrRightData = explode('.', $arr[1]);
if (count($arrLeftData) > 3 || count($arrRightData) > 3) {
throw new SFM_Exception("Can't parse relation string: {$formula}");
}
$sideLeft->isMany = $typeLeft == self::TYPE_MANY;
$sideRight->isMany = $typeRight == self::TYPE_MANY;
//Member names
$sideLeft->member = $arrLeftData[0];
$sideRight->member = $arrRightData[0];
//Owner is a side with bigger side or left otherwise
$isOwnerLefty = !($typeLeft == self::TYPE_ONE && $typeRight == self::TYPE_MANY);
$sideLeft->isOwner = $isOwnerLefty;
$sideRight->isOwner = !$isOwnerLefty;
//Complex fields
$sideLeft->complex = $this->parseComplex($arrLeftData, $sideRight->member, $sideLeft->isOwner);
$sideRight->complex = $this->parseComplex($arrRightData, $sideLeft->member, $sideRight->isOwner);
//Simple fields
$sideLeft->simple = $this->parseSimple($arrLeftData, $sideLeft->member, $sideRight->member, $sideLeft->isOwner);
$sideRight->simple = $this->parseSimple($arrRightData, $sideRight->member, $sideLeft->member, $sideRight->isOwner);
} else {
throw new SFM_Exception("Can't parse relation {$formula}");
}
$sideRight->table = $sideLeft->table = $table;
return $this->factory->relation($this->engine, $formula, array($sideLeft, $sideRight));
}
