Question

I am adding a event listener to my Singleton class. I am adding the listener in a add method.

 public void add(TCComponentItemRevision tcRevision, TCComponentDataset selectedDataset) {
  String revMasterForm;

  tcRevision.getSession().addAIFComponentEventListener(this);

  try {
     revMasterForm = tcRevision.getRelatedComponent("IMAN_master_form_rev").getUid();
     RevDataset pp = new RevDataset(tcRevision, selectedDataset, revMasterForm);
     if (!rds.contains(pp)) {
        rds.add(pp);
     }     
  }
  catch (TCException e) {

     e.printStackTrace();
  }

  fireTableDataChanged();
}

I only want the lister to be adding once. So I figure there has to be some sort of a check.
something like

if (listener value == null) {
    tcRevision.getSession().addAIFComponentEventListener(this);
}

But I am not sure how to get the listener value?

Answer 1

I don’t know what is the TCComponentItemRevision class but since this code is inside a Sigleton anyway you could use a boolean addedListener inside the Sigleton to check if the listener has been added:

if (!addedListener) {  
    tcRevision.getSession().addAIFComponentEventListener(this);  
    addedListener = true;  
}