How can I extend an OHLCItem class and use it in OHLCSeries

Question

I would like to extend behaviour of an OHLCItem class from the JFreeChart library and I would like to use those custom objects to build an OHLCSeries with them. This works ok. However, when I am trying to retrieve those objects from the OHLCSeries using the getDataItem(int index) method, I only receive ComparableObjectItem objects which can be only casted to OHLCItem, but can not be casted to my custom class. Here's how I define my custom class:

public class CustomOHLCItem extends OHLCItem {
private boolean isJoinedCandle;
private OHLCItem clickedItem;
private OHLCItem neighbourItem;
public CustomOHLCItem(RegularTimePeriod period, double open, double high, double low, double close, boolean isJoinedCandle) {
    super(period, open, high, low, close);
    this.isJoinedCandle = isJoinedCandle;
}

public boolean isJoinedCandle() {
    return isJoinedCandle;
}

public OHLCItem getClickedItem() {
    return clickedItem;
}

public void setClickedItem(OHLCItem clickedItem) {
    this.clickedItem = clickedItem;
}

public OHLCItem getNeighbourItem() {
    return neighbourItem;
}

public void setNeighbourItem(OHLCItem neighbourItem) {
    this.neighbourItem = neighbourItem;
}

}

So, is there any way I can retrieve objects of my custom class from the OHLCSeries?

Answer 1

If you look through the source code for the OHLCSeries class, you'll see the issue pretty quickly (in the add(OHCLItem) method). You will need to create your own CustomOHLCSeries class.