LOMStructureInitiator.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\MetaData\Structure;
 
use Generator;
use ilMDStructureException;
use ILIAS\MetaData\Elements\Structure\StructureFactory;
use ILIAS\MetaData\Elements\Structure\StructureElement;
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
{
    public function __construct(
        protected ReaderFactoryInterface $reader_factory,
        protected StructureFactory $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())
            );
        }
    }
}