@Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        DataStatsTable stat = stats.get(rowIndex);
        switch (columnIndex) {
            case 0:
                return stat.dataCategory;
            case 1:
                return stat.dataType;
            case 2:
                return stat.dataCount;
            case 3:
                return stat.dataSize;
            case 4:
                return stat.dataStatisticsMap;
            case 5:
                return stat.dataUpdateTime;
        }
        return "";
    }