class.ilObjBibliographicStakeholder.php

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<?php

use ILIAS\ResourceStorage\Identification\ResourceIdentification;
use ILIAS\ResourceStorage\Stakeholder\AbstractResourceStakeholder;

class ilObjBibliographicStakeholder extends AbstractResourceStakeholder
{
    protected ?ilDBInterface $database = null;

    public function getId(): string
    {
        return 'bibl';
    }

    public function getOwnerOfNewResources(): int
    {
        return $this->default_owner;
    }

    public function getLocationURIForResourceUsage(ResourceIdentification $identification): ?string
    {
        $this->initDB();

        $r = $this->database->query(
            "SELECT id FROM il_bibl_data WHERE rid = " . $this->database->quote($identification->serialize(), 'text')
        );
        $d = $this->database->fetchObject($r);
        if (isset($d->id)) {
            $references = ilObject::_getAllReferences($d->id);
            $ref_id = array_shift($references);

            return ilLink::_getLink($ref_id, 'bibl');
        }
        return null;
    }

    private function initDB(): void
    {
        global $DIC;
        $this->database = $DIC->database();
    }
}