Drag and drop row within same table.

Question

Version 12.1.2
I am trying to implement drag and drop row within same table, and I am trying to follow this sample from Frank:
http://www.oracle.com/technetwork/developer-tools/adf/learnmore/106-reorder-table-rows-1921121.pdf
But, I am getting this cast exception. The code I have in my dropEvent bean is identical to whats on the sample.
oracle.jbo.server.ViewRowImpl cannot be cast to oracle.jbo.uicli.binding.JUCtrlHierNodeBinding
ADF_FACES-60097:For more information, please see the server's error log for an entry beginning with: ADF_FACES-60096:Server Exception during PPR, #1
Not sure if anything has changed on 12c release, or if I am missing anything.
Here is my complete code:
public DnDAction doDnD(DropEvent dropEvent) {
RichTable table = (RichTable) dropEvent.getDragComponent();
List dropRowKey = (List) dropEvent.getDropSite();
if (dropRowKey == null) {
return DnDAction.NONE;
Transferable t = dropEvent.getTransferable();
DataFlavor<RowKeySet> df = DataFlavor.getDataFlavor(RowKeySet.class, "rowmove");
RowKeySet rks = t.getData(df);
Iterator iter = rks.iterator();
List draggedRowKey = (List) iter.next();
JUCtrlHierNodeBinding draggeRowNode = (JUCtrlHierNodeBinding) table.getRowData(draggedRowKey);
Row dragRow = draggeRowNode.getRow();
JUCtrlHierNodeBinding dropRowObject = (JUCtrlHierNodeBinding) table.getRowData(dropRowKey);
Row dropRow = dropRowObject.getRow();
//get the table's ADF JUCtrlHierBinding
CollectionModel collectionModel = (CollectionModel) table.getValue();
JUCtrlHierBinding treeBinding = (JUCtrlHierBinding) collectionModel.getWrappedData();
DCIteratorBinding objectsIterator = treeBinding.getDCIteratorBinding();
RowSetIterator rsi = objectsIterator.getRowSetIterator();
int indexOfDropRow = rsi.getRangeIndexOf(dropRow);
dragRow.removeAndRetain();
rsi.insertRowAtRangeIndex(indexOfDropRow, dragRow);
objectsIterator.setCurrentRowIndexInRange(indexOfDropRow);
AdfFacesContext adfctx = AdfFacesContext.getCurrentInstance();
adfctx.addPartialTarget(table.getParent());
return DnDAction.MOVE;
It does not seem to like this line of code:
JUCtrlHierNodeBinding draggeRowNode = (JUCtrlHierNodeBinding) table.getRowData(draggedRowKey);
I would greatly appreciate any help.
Thanks.

Answer 1

Well there has bee a changes somehow. using 12c
table.getRowData(draggedRowKey);
returns a ViewRowImpl and no longer anything which can be convertet to JUCtrlHierNodeBinding. Anyway, the fix is easy:
    public DnDAction onDepartmentsRowDrop(DropEvent dropEvent) {
        //get the table instance. This information is later used
        //to determine the tree binding and the iterator binding
        RichTable table = (RichTable) dropEvent.getDragComponent();
        List dropRowKey = (List) dropEvent.getDropSite();
        //if no dropsite then drop area was not a data area
        if (dropRowKey == null) {
            return DnDAction.NONE;
        //The transferable is the payload that contains the dragged row's
        //row key that we use to access the dragged row handle in the ADF
        //iterator binding
        Transferable t = dropEvent.getTransferable();
        //get the row key set of the dragged row. The "rowmove" string is the
        //discriminant defined on the drag source and the collectionDrop target.
        DataFlavor<RowKeySet> df = DataFlavor.getDataFlavor(RowKeySet.class, "rowmove");
        RowKeySet rks = t.getData(df);
        Iterator iter = rks.iterator();
        //for this use case the re-order of rows is one-by-one, which means that the rowKeySet
        //should only contain a single entry. If it contains more then still we only look at a
        //singe (first) row key entry
        List draggedRowKey = (List) iter.next();
        //get access to the oracle.jbo.Row instance represneting this table row
        Object objdragg = table.getRowData(draggedRowKey);
        Row dragRow = (Row) objdragg;
        Object objdrop = table.getRowData(dropRowKey);
        Row dropRow = (Row) objdrop;
        //get the table's ADF JUCtrlHierBinding
        CollectionModel collectionModel = (CollectionModel) table.getValue();
        JUCtrlHierBinding treeBinding = (JUCtrlHierBinding) collectionModel.getWrappedData();
        //get access to the ADF iterator binding used by the table and the underlying RowSetIterator.
        //The RowSetIterator allows us to remove and re-instert the dragged row
        DCIteratorBinding departmentsIterator = treeBinding.getDCIteratorBinding();
        RowSetIterator rsi = departmentsIterator.getRowSetIterator();
        int indexOfDropRow = rsi.getRangeIndexOf(dropRow);
        //remove dragged row from collection so it can be added back
        dragRow.removeAndRetain();
        rsi.insertRowAtRangeIndex(indexOfDropRow, dragRow);
        //make row current in ADF iterator.
        departmentsIterator.setCurrentRowIndexInRange(indexOfDropRow);
        //ppr the table
        AdfFacesContext adfctx = AdfFacesContext.getCurrentInstance();
        //note that the refresh of the table didn't work when refreshing the table
        //so I needed to refresh the container component (af:panelStretchLayout).
        adfctx.addPartialTarget(table.getParent());
        return DnDAction.MOVE;
does the trick. I changed the line to
//get access to the oracle.jbo.Row instance represneting this table row
        Object objdragg = table.getRowData(draggedRowKey);
        Row dragRow = (Row) objdragg;
so you don't need the detour through the JUCtrlHierNodeBinding any longer.
Timo