*/
    @Override
    public void delete(final String sessionId) {
        dataHelper.clearUrlPattern(sessionId);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.service.impl.UrlFilterService#deleteAll()
     */
    @Override
    public void deleteAll() {
        dataHelper.clearUrlPattern();
    }

    /*
     * (non-Javadoc)
     *
     * @see

     * @param sessionId the session ID
     */
    public synchronized void clearUrlPattern(final String sessionId) {
        includeUrlPatternMap.remove(sessionId);
        excludeUrlPatternMap.remove(sessionId);
    }

    /**
     * Clears all URL patterns.
     */
    public synchronized void clearUrlPattern() {
        includeUrlPatternMap.clear();
        excludeUrlPatternMap.clear();
    }