Set.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\MetaData\Elements;
 
use ILIAS\MetaData\Elements\Base\BaseSet;
use ILIAS\MetaData\Elements\RessourceID\RessourceIDInterface;
 
class Set extends BaseSet implements SetInterface
{
    private RessourceIDInterface $ressource_id;
 
    public function __construct(
        RessourceIDInterface $ressource_id,
        ElementInterface $root
    ) {
        parent::__construct($root);
        $this->ressource_id = $ressource_id;
    }
 
    public function getRessourceID(): RessourceIDInterface
    {
        return $this->ressource_id;
    }
 
    public function getRoot(): ElementInterface
    {
        $root = parent::getRoot();
        if ($root instanceof ElementInterface) {
            return $root;
        }
        throw new \ilMDElementsException(
            'Metadata set has invalid root element.'
        );
    }
}