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javajfreechartchangelistener

Java and JFreechart: get only modified entry from a DatasetChangeEvent

I'm using a DatasetChangeListener to monitor the modification of some XYSeriesCollection because a change in one series must be reflected to other series of my application's charts.

public void datasetChanged(DatasetChangeEvent arg0) {
     XYSeriesCollection d = (XYSeriesCollection)arg0.getDataset();
     System.out.println(d.getGroup().getID());
}

I'm using DatasetGroup to store a string that uniquely identify the dataset.

Now the point is, I would like to know only the single entry of the dataset on which the changed occured, otherwise I am forced to iterate through all the dataset and inspect all datas. Is there any way to do that?

For example I would like to know that a changed occured for the series 1 in the collection, on the y value of the third element. Is that possible?

Solution

  • The Dataset returned by getDataset() is probably not useful in this context. Instead, look at the source of a SeriesChangeEvent. You'll probably have to override one or more of the add() methods in a subclass of XYSeries to track the change details.