factory.php

<?php
namespace Bitrix\Calendar\Sharing\Link\Rule;
 
use Bitrix\Calendar\Sharing\Link;
 
class Factory
{
    public function getRuleBySharingLink(Link\Joint\JointLink $sharingLink): ?Rule
    {
        $linkObjectRule = $this->getLinkObjectRuleByLink($sharingLink);
 
        if (!is_null($linkObjectRule))
        {
            return (new Mapper())->getFromLinkObjectRule($linkObjectRule);
        }
 
        return null;
    }
 
    public function getLinkObjectRuleByLink(Link\Joint\JointLink $sharingLink): ?LinkObjectRule
    {
        if ($sharingLink instanceof Link\CrmDealLink)
        {
            return (new Link\Rule\UserCrmDealRule($sharingLink->getOwnerId()))
                ->setLinkId($sharingLink->getId());
        }
 
        if ($sharingLink instanceof Link\UserLink)
        {
            return (new Link\Rule\UserRule($sharingLink->getUserId()))
                ->setLinkId($sharingLink->getId());
        }
 
        return null;
    }
}