LOMStructureInitiator.php

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<?php

declare(strict_types=1);

namespace ILIAS\MetaData\Structure;

use ILIAS\MetaData\Elements\Base\BaseElementInterface;
use ILIAS\MetaData\Elements\Structure\StructureFactory;
use ILIAS\MetaData\Elements\ElementInterface;
use ILIAS\MetaData\Elements\Structure\StructureElement;
use ILIAS\MetaData\Paths\FactoryInterface as PathFactoryInterface;
use ILIAS\MetaData\Paths\Navigator\NavigatorFactoryInterface;
use ILIAS\MetaData\Elements\Structure\StructureSetInterface;
use ILIAS\MetaData\Structure\Definitions\ReaderFactoryInterface;
use ILIAS\MetaData\Structure\Definitions\ReaderInterface;
use ILIAS\MetaData\Elements\Structure\StructureElementInterface;

class LOMStructureInitiator
{
    protected ReaderFactoryInterface $reader_factory;
    protected StructureFactory $structure_factory;

    public function __construct(
        ReaderFactoryInterface $reader_factory,
        StructureFactory $structure_factory
    ) {
        $this->reader_factory = $reader_factory;
        $this->structure_factory = $structure_factory;
    }

    public function set(): StructureSetInterface
    {
        return $this->structure_factory->set(
            $this->getStructureRoot()
        );
    }

    protected function getStructureRoot(): StructureElementInterface
    {
        $reader = $this->reader_factory->reader();
        return $this->structure_factory->root(
            $reader->definition(),
            ...$this->getSubElements(0, ...$reader->subDefinitions())
        );
    }

    protected function getSubElements(
        int $depth,
        ReaderInterface ...$readers
    ): \Generator {
        if ($depth > 20) {
            throw new \ilMDStructureException('LOM Structure is nested to deep.');
        }
        foreach ($readers as $reader) {
            yield $this->structure_factory->structure(
                $reader->definition(),
                ...$this->getSubElements($depth + 1, ...$reader->subDefinitions())
            );
        }
    }
}