* @return The Directive object matching the user agent, or null if no matching directive is found or if userAgent is null
     */
    public Directive getDirective(final String userAgent) {
        if (userAgent == null) {
            return null;
        }
        for (final Directive directive : directiveMap.values()) {

                        isGroupRecordStarted = false;
                    }
                    final String userAgent = value.toLowerCase(Locale.ENGLISH);
                    Directive currentDirective = robotsTxt.getDirective(userAgent);
                    if (currentDirective == null) {
                        currentDirective = new Directive(userAgent);
                        robotsTxt.addDirective(currentDirective);