class.ilCertificateObjectsForUserPreloader.php

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<?php
/* Copyright (c) 1998-2018 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilCertificateObjectsForUserPreloader
{
    private static $certificates = [];

    private $userCertificateRepository;

    public function __construct(ilUserCertificateRepository $userCertificateRepository)
    {
        $this->userCertificateRepository = $userCertificateRepository;
    }

    public function preLoad(int $userId, array $objIds)
    {
        if (!array_key_exists($userId, self::$certificates)) {
            self::$certificates[$userId] = [];
        }

        $objectIdsWithUserCertificate = $this->userCertificateRepository->fetchObjectIdsWithCertificateForUser(
            $userId,
            array_diff($objIds, self::$certificates[$userId])
        );

        self::$certificates[$userId] = array_unique(array_merge(
            $objectIdsWithUserCertificate,
            self::$certificates[$userId]
        ));
    }

    public function isPreloaded(int $userId, int $objId) : bool
    {
        if (false === array_key_exists($userId, self::$certificates)) {
            return false;
        }

        if (true === in_array($objId, self::$certificates[$userId])) {
            return true;
        }

        return false;
    }
}