JTree recursive root with different children

Question

Hi,
I'm trying to create a JTree with the following content:
<root>
|- Department 1
| |- Sub-department 1a
| | |- Employee 1a-1
| | \- Employee 1a-2
| \- Sub-department 1b
| |- Employee 1b-1
|- Department 2
| |- Employee 2-1
|- Department 3
\- Sub-department 3a
\- Sub-department 3a-1
|- Employee 3a-1-1
\- Employee 31-1-2
As you can see, the tree root can contain multiple departments. A department can consist of sub-departments and/or employees. A sub-department can also exist of sub-departments and/or employees. So the department records are some kind of tree and the employees can be put in a certain (sub-)department.
The problem is how do I map this on a JTree? If you look at the following message, Re: What is meant by  Vintage Assests Maintenace you will see that my problem looks similar but isn't quite the same. I came up with the following code (which obviously doesn't work the way I like it to work):
jTree1.setModel
JUTreeBinding.createTreeNodeTypeBinding
panelBinding, jTree1, "VGroup", null, "VGroupIter",
new JUCtrlHierTypeBinding[]
new JUTreeAccessorTypeBinding("NodeType1", "mypackage1.VGroup", "Name", "SubGroups", null, null, null),
new JUTreeAccessorTypeBinding("NodeType2", "mypackage1.VGroup", "Name", "Employees", null, null, null),
new JUTreeAccessorTypeBinding("NodeType3", "mypackage1.VEmployee", "Descriptor", null, null, null, null)
Ofcourse I've created the necessary view object (with accessors) and view links. BTW, the above code doesn't make sure the root elements don't have a parent but that's no big deal at the moment.
How do I map my example on a JTree?

Answer 1

You may want to create a "polymorphic node" to imply that if the row behind a node has an attribute of a given value - execute a certain "accessor" to get the children.
Here's an example where I created four different Node types for EmpView, based on four values of Deptno in SCOTT schema.
jTree1.setModel(JUTreeBinding.createTreeNodeTypeBinding(
panelBinding, jTree1, "DeptView1", null, "DeptView1Iter",
new JUCtrlHierTypeBinding[] {
new JUTreeAccessorTypeBinding("NodeType1", "bc4j.DeptView", "Dname", "EmpView", null, null, null),
new JUTreeDiscrAttrTypeBinding("NodeType2", "bc4j.EmpView", "Ename", "Deptno", "10", "ReverseDept", null, null, null),
new JUTreeDiscrAttrTypeBinding("NodeType3", "bc4j.EmpView", "Ename", "Deptno", "20", "EmpView", null, null, null),
new JUTreeDiscrAttrTypeBinding("NodeType4", "bc4j.EmpView", "Ename", "Deptno", "30", "ReverseMgr", null, null, null),
new JUTreeDiscrAttrTypeBinding("NodeType5", "bc4j.EmpView", "Ename", "Deptno", "40", "EmpView", null, null, null)}));
Note that the UI editor/model editor did not let me create such a polymorphic set. So I first created four EmpView polymorphic nodes by specifying EmpView as accessor (and different deptno values). Then I edited the model in java/code editor to fixup the accessor names. Also note that these accessors should return a "RowIterator" for the JUTree binding to work.