Retrieval.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\LearningModule\Editing\ShortTitles;
 
use Generator;
use ILIAS\Data\Order;
use ILIAS\Data\Range;
use ILIAS\Repository\RetrievalBase;
use ILIAS\Repository\RetrievalInterface;
use ilLMObject;
 
class Retrieval implements RetrievalInterface
{
    use RetrievalBase;
 
    protected ?array $data = null;
 
    public function __construct(
        protected int $lm_id,
        protected string $lang
    ) {
    }
 
    public function getData(
        array $fields,
        ?Range $range = null,
        ?Order $order = null,
        array $filter = [],
        array $parameters = []
    ): Generator {
        $data = $this->getShortTitles();
        $data = $this->applyOrder($data, $order);
        $data = $this->applyRange($data, $range);
 
        yield from $data;
    }
 
    public function count(array $filter, array $parameters): int
    {
        return count($this->getShortTitles());
    }
 
    public function isFieldNumeric(string $field): bool
    {
        return $field === "id";
    }
 
    protected function getShortTitles(): array
    {
        if ($this->data !== null) {
            return $this->data;
        }
 
        $data = [];
        foreach (ilLMObject::getShortTitles($this->lm_id, $this->lang) as $short_title) {
            $data[] = [
                "id" => (int) $short_title["obj_id"],
                "title" => $short_title["title"],
                "short_title" => $short_title["short_title"],
                "default_title" => $short_title["default_title"] ?? "",
                "default_short_title" => $short_title["default_short_title"] ?? ""
            ];
        }
 
        return $this->data = $data;
    }
}