protected final Map<String, PropertyGateway> _epgMap = newHashMap();
    {
        setupEpg(_epgMap, et -> ((BoostDocumentRule) et).getBoostExpr(),
                (et, vl) -> ((BoostDocumentRule) et).setBoostExpr(DfTypeUtil.toString(vl)), "boostExpr");
        setupEpg(_epgMap, et -> ((BoostDocumentRule) et).getCreatedBy(),
                (et, vl) -> ((BoostDocumentRule) et).setCreatedBy(DfTypeUtil.toString(vl)), "createdBy");

    protected <RESULT extends BoostDocumentRule> RESULT createEntity(Map<String, Object> source, Class<? extends RESULT> entityType) {
        try {
            final RESULT result = entityType.newInstance();
            result.setBoostExpr(DfTypeUtil.toString(source.get("boostExpr")));
            result.setCreatedBy(DfTypeUtil.toString(source.get("createdBy")));
            result.setCreatedTime(DfTypeUtil.toLong(source.get("createdTime")));