public function generateFiles() {
        if ($this->files === null) {
            $this->files = array();
            $this->tracingLinks = array();
            $this->_generateFiles();
        }
        if ($this->settings->getOptional("logFile", false))
            return array_merge(array($this->logFile), $this->files);
        else
            return $this->files;
    }