How to make a Tree Node invisible?

Question

Hi
I have got a JTree where I have created a DefaultTreeModel and a DefaultTreeCellRenderer. The JTree is filled to data from data base. These nodes after are used to do querys to a data base. But when in tree's level 2 has got only a child, this node I want to set like not visible. because this node i need it do querys.
I have found a thread to explain something:
http://forum.java.sun.com/thread.jsp?forum=57&thread=126031
a) A kind to do, it is so
I make a new Class extends DefaultTreeCellRenderer, but it doesn't work, the code is here
public class SegnalarNodoRender extends DefaultTreeCellRenderer {
  public SegnalarNodoRender() {
  public Component getTreeCellRendererComponent(JTree tree, Object value,
                                                boolean sel, boolean expanded, boolean leaf,
                                                int row, boolean hasFocus) {
           Component comp;
          DefaultMutableTreeNode nodo = (DefaultMutableTreeNode) value;
          DefaultMutableTreeNode padreNodo = (DefaultMutableTreeNode) nodo.getParent();
           if (leaf && sel)  {
             return super.getTreeCellRendererComponent(tree,value,sel,
                                                       expanded,leaf,row,hasFocus);}
           else
             if (!leaf && nodo.getLevel()==2 && padreNodo.getChildCount()==1 ) {
             //Set not visible
               this.setVisible(false);
               return  super.getTreeCellRendererComponent(tree, value, false,
                                                         expanded, leaf, row, hasFocus);
             else {
               return super.getTreeCellRendererComponent(tree, value, false,
                                                         expanded, leaf, row, hasFocus);
}b) the anoher kinds it explains how to make it. It is extended a class from DefaultTreeModel, But it is in this function the this class(botton), where I don't know how the node sets to invisible. Why NodoPadre hasn't any function to set invisible.
public Object getChild(Object parent, int index) {
  // DefaultMutableTreeNode NodoPadre = (DefaultMutableTreeNode) parent;
  // TreeNode p;
  // p = NodoPadre.getParent();
   return parent;
}I hope somebody can help me.
thanks in advanced.

Answer 1

Hi,
I have the same problem and would realy like to know how to do this´, using ADF Faces 11G with the up to date JDeveloper.
I've found some blog entries in the web showing how to do this with a POJO-based approach. They insert Data programmatically based on a view object's result set, reading all data and inserting the data to the POJO.
However, I like to
1) Drag-And-Drop the data-control (based on one master and one details - view object and a view link) to a page and add it as tree table
2) Get the folder icon only displayed when there are children
3) get the last child (=leaf) displayed without folder icon.
To make this possible, we should somehow extend the TreeModel Class and override the function isContainer
@Override
public boolean isContainer() {
  if (getRowData() != null) {
     MyRowImpl value = (MyRowImpl) getRowData();
    if (value.getChildValues() != null &&
       value.getChildValues().size() > 0) {
      return true;
    return false;
}Can somehow please give me a hint how to extend the tree model base class (What class?) and how to get the framework to use this model class?
Maybe there is a sample application for 11g somewhere?
Thanks,
Stefan
Edited by: Stefan1979 on 04.11.2009 18:10