}

    public void addIntervalRule(final String from, final String to, final String days, final long delay) {
        ruleList.add(new IntervalRule(from, to, days, delay));
    }

    public boolean isCrawlerRunning() {
        return crawlerRunning;
    }

    public void setCrawlerRunning(final boolean crawlerRunning) {
        this.crawlerRunning = crawlerRunning;
    }

    public static class IntervalRule {