Dvt:hierarchy node Drag and drop functionality

Question

Hello,
I noticed that in the JDeveloper 11.1.2.3 Rich Client Demo that drag and drop in heirarchical views is now available. Excellent news!
I have tried to implement this functionality in my application but I'm having a few problems.
The demo uses the following code to get the row data....
      UIHierarchyViewer hv = (UIHierarchyViewer)dropEvent.getDropComponent();
      TreeModel model = (TreeModel)hv.getValue();
      Map dropSite = (Map) dropEvent.getDropSite();
      String dropTargetClientRowKey = (String)dropSite.get("clientRowKey");
      Employee dropTargetEmployee = null;
      if (dropTargetClientRowKey != null)
        Object dropTargetRowKey = hv.getClientRowKeyManager().getRowKey(FacesContext.getCurrentInstance(),
                                                                        hv, dropTargetClientRowKey);
        model.setRowKey(dropTargetRowKey);
        dropTargetEmployee = (Employee)model.getRowData();
      }this works for me if I alter it slightly thus
           dropTargetEmployee = (usersFromVORowImpl)((JUCtrlHierNodeBinding) model.getRowData()).getRow();and am dragging and dropping between the highest level nodes but if I drop into a lower (child) node it fails with NPE when invoking .getRowData, presumably because the model reflects the top view of the master detail model (model.getRowCount supports this theory)
so how do I get rowdata from child levels of the HV model? Franks example 101 of dropping into a RichTree gives a List back from the dropEvent for a tree, but HV's give back a Map
I have started to experiment with "enterContainer" on the model variable but I can't seem to extract the values of the rowKey to use, I just get "dropTargetRowKey = [oracle.jbo.Key[], oracle.jbo.Key[]]" can anyone tell me how to get the key elements out of the object returned by getClientRowKeyManager().getRowKey? It's coming back as a Singleton but I can't get the List elements out of it although I can see them when I inspect the object in the debugger
Any help appreciated, many thanks!
JDeveloper version 11.1.2.3

Answer 1

or more simply, does anyone have an example of dragging and dropping from a root node to a child node in a heirarchy viewer using oracle database tables as the master detail via views and view links? (e.g. departments/employees)
Thanks