class.ilLTIRouterGUI.php

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<?php

declare(strict_types=1);

class ilLTIRouterGUI implements ilCtrlBaseClassInterface
{
    protected ilCtrl $ilCtrl;
    protected ilGlobalTemplateInterface $main_tpl;

    public function __construct()
    {
        global $DIC;
        $this->ilCtrl = $DIC->ctrl();
        $this->main_tpl = $DIC->ui()->mainTemplate();
    }

    public function executeCommand(): void
    {
        $next_class = $this->ilCtrl->getNextClass($this);
        $class_file = '../' . ltrim($this->ilCtrl->lookupClassPath($next_class), './');

        if (is_file($class_file)) {
            //ToDo: check - was $gui = $next_class::getInstance(); // Singleton!
            $gui = $next_class::getInstance();
            //            $gui = call_user_func([$next_class, 'getInstance']);
            $this->ilCtrl->forwardCommand($gui);
        } else {
            $this->main_tpl->setOnScreenMessage('failure', 'GUI-Class not found! (' . $next_class . ')');
        }
    }
}