this.userAgent = userAgent;
        }

        /**
         * Sets the crawl delay for this directive.
         * @param crawlDelay the crawl delay in seconds
         */
        public void setCrawlDelay(final int crawlDelay) {
            this.crawlDelay = crawlDelay;
        }

        /**
         * Gets the crawl delay for this directive.
         * @return the crawl delay in seconds
         */