to::applyDeleteRestrictions

static function applyDeleteRestrictions(&$id, &$parentId)
{
	$id = Assert::expectIntegerPositive($id, '$id');

	if($parentId !== false) // parent id === false means that all links with all parents will be broken
	{
		$parentId = Assert::expectIntegerPositive($parentId, '$parentId');
	}

	if(!static::checkNodeExists($id))
	{
		throw new TreeTargetNodeNotFoundException(false, array('NODES' => array($id)));
	}

	if($parentId !== false && !static::checkLinkExists($id, $parentId))
	{
		throw new TreeLinkNotExistException(false, array('NODES' => array($id, $parentId)));
	}
}