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
         */

                                final int crawlDelay = Integer.parseInt(value);
                                for (final Directive directive : currentDirectiveList) {
                                    directive.setCrawlDelay(Math.max(0, crawlDelay));
                                }
                            } catch (final NumberFormatException e) {
                                // ignore invalid crawl-delay values