class.ilECSCommunitiesCache.php

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<?php

declare(strict_types=1);

class ilECSCommunitiesCache
{
    private static ?\ilECSCommunitiesCache $instance = null;

    private ilDBInterface $db;

    private array $communities = array();

    protected function __construct()
    {
        global $DIC;

        $this->db = $DIC->database();

        $this->read();
    }

    public static function getInstance(): ilECSCommunitiesCache
    {
        return self::$instance ?? (self::$instance = new ilECSCommunitiesCache());
    }

    public function delete(int $a_server_id): void
    {
        $query = 'DELETE FROM ecs_community ' .
            'WHERE sid = ' . $this->db->quote($a_server_id, 'integer');
        $this->db->manipulate($query);
        $this->read();
    }

    public function getCommunities(): array
    {
        return $this->communities;
    }

    public function lookupOwnId(int $a_server_id, int $a_mid): int
    {
        foreach ($this->getCommunities() as $com) {
            if (($com->getServerId() === $a_server_id) && in_array($a_mid, $com->getMids(), true)) {
                return $com->getOwnId();
            }
        }
        return 0;
    }

    public function lookupTitle(int $a_server_id, int $a_mid): string
    {
        foreach ($this->getCommunities() as $com) {
            if (($com->getServerId() === $a_server_id) && in_array($a_mid, $com->getMids(), true)) {
                return $com->getCommunityName();
            }
        }
        return '';
    }

    private function read(): void
    {
        $query = 'SELECT sid,cid FROM ecs_community ';
        $res = $this->db->query($query);
        while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
            $this->communities[] = ilECSCommunityCache::getInstance((int) $row->sid, (int) $row->cid);
        }
    }
}