StructureSet.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\MetaData\Elements\Structure;
 
use ILIAS\MetaData\Elements\Base\BaseSet;
 
class StructureSet extends BaseSet implements StructureSetInterface
{
    public function __construct(StructureElementInterface $root)
    {
        parent::__construct($root);
    }
 
    public function getRoot(): StructureElementInterface
    {
        $root = parent::getRoot();
        if ($root instanceof StructureElementInterface) {
            return $root;
        }
        throw new \ilMDElementsException(
            'Metadata set has invalid root element.'
        );
    }
}