protected function determineInputFiles()
    {
        if (empty($this->route->getParameters()->files))
        {
            $this->setNotReady("No input files found.", null, 404);
            return;
        }

        if (is_array($this->route->getParameters()->files))
        {
            foreach ($this->route->getParameters()->files as $file)
            {
                $this->addFileObject((string) $file);
            }
        }
        else
        {
            $this->addFileObject((string) $this->route->getParameters()->files);
        }
    }