class.ilLanguageDetectorFactory.php

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<?php

declare(strict_types=1);

class ilLanguageDetectorFactory
{
    private const DEFAULT_DETECTOR = 1;
    private const HTTP_REQUEST_DETECTOR = 2;

    protected ilIniFile $client_ini;
    protected array $request_information = array();
    protected ilSetting $settings;

    public function __construct()
    {
        global $DIC;

        $this->client_ini = $DIC->clientIni();
        $this->request_information = $_SERVER;
        $this->settings = $DIC->settings();
    }

    public function getValidInstances(): array
    {
        $detectors = array(
            $this->createDetectorByType(self::DEFAULT_DETECTOR)
        );

        if ($this->settings->get("lang_detection") &&
            ilContext::usesHTTP() &&
            array_key_exists('HTTP_ACCEPT_LANGUAGE', $this->request_information)
        ) {
            $detectors[] = $this->createDetectorByType(self::HTTP_REQUEST_DETECTOR);
        }

        return $detectors;
    }

    public function createDetectorByType(int $type)
    {
        switch ($type) {
            case self::HTTP_REQUEST_DETECTOR:
                return new ilHttpRequestsLanguageDetector($this->request_information["HTTP_ACCEPT_LANGUAGE"]);

            case self::DEFAULT_DETECTOR:
                return new ilDefaultLanguageDetector($this->client_ini);
        }

        throw new ilLanguageException(__METHOD__ . sprintf("Cannot create language detector instance for type %s!", $type));
    }
}