private String[] labelTypeIds;

    private volatile List<LabelType> labelTypeList;

    /* (non-Javadoc)
     * @see org.codelibs.fess.db.exentity.CrawlingConfig#getLabelTypeIds()
     */
    public String[] getLabelTypeIds() {
        if (labelTypeIds == null) {
            return StringUtil.EMPTY_STRINGS;
        }
        return labelTypeIds;
    }