private function getOptionsSearchStrings() {
        if (empty($this->searchStringsCache)) {
            $this->searchStringsCache = array(
                0 => '',
                1 => array(),
            );
            foreach ($this->parameters as $Option) {
                $postfix = self::getPostfix($Option);
                /** @var $Option Option */
                $this->searchStringsCache[0] .= $Option->getShort() . $postfix;
                $this->searchStringsCache[1][] = $Option->getLong() . $postfix;
            }
        }
        return $this->searchStringsCache;
    }