Reader.php

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<?php

declare(strict_types=1);

namespace ILIAS\MetaData\Services\Reader;

use ILIAS\MetaData\Paths\PathInterface;
use ILIAS\MetaData\Elements\Data\DataInterface;
use ILIAS\MetaData\Elements\SetInterface;
use ILIAS\MetaData\Paths\Navigator\NavigatorFactoryInterface;
use ILIAS\MetaData\Elements\Data\NullData;

class Reader implements ReaderInterface
{
    protected NavigatorFactoryInterface $navigator_factory;
    protected SetInterface $set;

    public function __construct(
        NavigatorFactoryInterface $navigator_factory,
        SetInterface $set
    ) {
        $this->navigator_factory = $navigator_factory;
        $this->set = $set;
    }

    public function allData(PathInterface $path): \Generator
    {
        $navigator = $this->navigator_factory->navigator($path, $this->set->getRoot());
        foreach ($navigator->elementsAtFinalStep() as $element) {
            yield $element->getData();
        }
    }

    public function firstData(PathInterface $path): DataInterface
    {
        $navigator = $this->navigator_factory->navigator($path, $this->set->getRoot());
        if ($first = $navigator->elementsAtFinalStep()->current()) {
            return $first->getData();
        }
        return new NullData();
    }
}