Defining an Event Source

Ultimately, to define an event source, you must implement the hep.analysis.EventSource interface.  If you want the variables from your event source to appear on the job tree, implement instead the interface jas.job.AnnotatedEventSource, which extends the hep.analysis.EventSource interface.

Implementing jas.job.AnnotatedEventSource

In addition to implementing the methods in the hep.analysis.EventSource interface, you must additionally implelent the following methods:

• public jas.jds.interfaces.TreeItem[] getItems()
  These tree items will be displayed on the job tree.  Normally there would be one item for each variable in your data set.  Here is how FlatFileEventSource implements this method:
  final TreeItem[] result = new TreeItem[fieldCount];
for (int i = 0; i < fieldCount; i++)
{
    result[i] = new TreeItem();
    result[i].path = new String[1];
    result[i].path[0] = data[i].getTitle();
    result[i].type = data[i].getType();
}
return result;
• public Object getItem(jas.jds.interfaces.TreeItem i)
  Return the histogram data or event source that corresponds to the given tree item.

Page maintained by Jonas Gifford.   Last updated 01/14/04.