*/
    public int getCrawlDelay(final String userAgent) {
        final Directive directive = getMatchedDirective(userAgent);
        if (directive == null) {
            return 0;
        }
        return directive.getCrawlDelay();
    }

    /**
     * Returns the most specific directive matching the given user agent.
     * The method finds the longest matching user agent pattern in the directives,