for::setExternalLocation2

static function setExternalLocation2($srvId, $locationId, $xmlId, $updateExist = false)
{
	if($xmlId == '')
		throw new ArgumentNullException('code');

	if($srvId == '')
		throw new ArgumentNullException('srvId');

	if(intval($locationId) <= 0)
		throw new ArgumentNullException('locationId');

	static $locCache = array();

	if(!isset($locCache[$srvId]))
	{
		$locCache[$srvId] = array();

		$eRes = ExternalTable::getList(array(
			'filter' => array(
				'=SERVICE_ID' => $srvId,
			),
			'select' => array('ID', 'SERVICE_ID', 'LOCATION_ID', 'XML_ID')
		));

		while($loc = $eRes->fetch())
			$locCache[$srvId][$loc['LOCATION_ID'].'##'.$loc['XML_ID']] = $loc['ID'];
	}

	if(!empty($locCache[$srvId][$locationId.'##'.$xmlId]))
	{
		if($updateExist)
		{
			$res = ExternalTable::update(
				$locCache[$srvId][$locationId.'##'.$xmlId],
				array(
					'SERVICE_ID' => $srvId,
					'XML_ID' => $xmlId,
					'LOCATION_ID' => $locationId
				));

			return $res;
		}
		else
		{
			$result = new BitrixMainEntityUpdateResult();
			$result->addError(new Error('External location already exists', 'EXTERNAL_LOCATION_EXISTS'));
			return $result;
		}
	}
	else
	{
		$res = ExternalTable::add(array(
			'SERVICE_ID' => $srvId,
			'XML_ID' => $xmlId,
			'LOCATION_ID' => $locationId
		));

		$locCache[$srvId][$locationId.'##'.$xmlId] = $res->getId();
		return $res;
	}
}