Auto increment min and max zoom levels when adding tiles to MBTilesFiles

MBTilesFiles.java

/**
     * Store a tile
     * 
     * @throws IOException
     */
    public void saveTile(MBTilesTile entry) throws IOException {
        try {
            Connection cx = connPool.getConnection();
            try {
                PreparedStatement ps;

                if (entry.getData() != null) {
                    ps = prepare(cx,
                            format("INSERT OR REPLACE INTO %s VALUES (?,?,?,?)", TABLE_TILES))
                            .set(entry.getZoomLevel()).set(entry.getTileColumn())
                            .set(entry.getTileRow()).set(entry.getData()).log(Level.FINE)
                            .statement();
                } else {
                    ps = prepare(
                            cx,
                            format("DELETE FROM %s WHERE zoom_level=? AND tile_column=? AND tile_row=?",
                                    TABLE_TILES)).set(entry.getZoomLevel())
                            .set(entry.getTileColumn()).set(entry.getTileRow()).log(Level.FINE)
                            .statement();
                }
                ps.execute();
                ps.close();

                saveMinMaxZoomMetadata((int)Math.min(entry.getZoomLevel(), this.minZoom()), (int)Math.max(entry.getZoomLevel(), this.maxZoom()));

            } finally {
                cx.close();
            }
        } catch (SQLException e) {
            throw new IOException(e);
        }
    }