检索仅具有ChartPanel引用的数据集(Java JFreeChart)

在构建ChartPanel之后我想知道：

public ChartPanel buildChart(){
    XYSeriesCollection dataset = new XYSeriesCollection();
...
    FreeChart chart = ChartFactory.createXYLineChart("line chart example",
                "X", "Y", dataset, PlotOrientation.VERTICAL, true, true, false);
    ChartPanel chartPanel = new ChartPanel(chart);
    return chartPanel;
}

我可以检索用于生成图表的数据集,但只能引用chartPanel吗？

ChartPanel panel = buildChart();
panel.getDataset; //I'm looking for a way to retrieve the dataset, or XYSeriesCollection..

那可能吗？有人能把我放在正确的方向吗？

提前致谢

ChartPanel chartPanel;
JFreeChart chart = chartPanel.getChart();
XYPlot plot = (XYPlot) chart.getPlot();
XYDataset data = plot.getDataset();