Problem in building swing tree

Question

I am trying to build a tree with the values obtained from the database.
I have clearly explained the steps i have followed and the problem i am facing
Please look at the below code, where i have given step by step explanation
can any one help me i n solving my problem?
//global variables
String ioGlobalDesc = null;
TransferObject transObj = null;
ObjVO[] ioObjVO = null; //holds the values to build the intial tree
ObjVO[] ioObjExpTree;//hold the child value of the every expansion
pv.jfcx.PVNode root;
1) I have a root node PVNode which inturn extends DefaultMutableTreeNode
pv.jfcx.PVNode root;
2) createIntialTree()
This is the first method i call to obtain the values from the database .This method inturns
call the setRootNode method to build my initial tree where i am passing the root and the ioObjVO[] which has the
values obtained from the database
/******************createInitial Tree starts here****************************/
public void createIntialTree(TransferObject poTransferObject)
          Hashtable output = poTransferObject.getResponseData();
          ioObjVO = (ObjVO[]) output.get("ObjVO");
          setRootNodes(root,ioObjVO);
3) After the setRootNode method is called from the createIntial tree,I am setting the values obtained
from the database to the root node.Here i am using my own class called MyNode which extends the PVNode,
This i am creating to set the desc and id for the particular node.
If you see the setRootNode method, I have created a node called ioCategory where i am setting the id and
description for the particular node. i have added ioCategory Node to the HashMap where desc is set as key and ioCategory itself is the value.
Now ioCategory node is added to the root node.
I am finiding the childcount for the obtained values from the database.while building the intial tree itself,if the child count is greater than zero,i am creating a subNode with empty values, this i am creating to denote that the particular node has the child.
i am adding the subNode to the ioCategory.
Now i am able to see the intial tree and also if node has childcount>0 then i am able to see the node handle.
Now if i click any of the node which has the childcount>0,it has take the particular node id and fetch the relavant child values
for the id i send,This is done when i expand my tree
Now i have expanded a node Which has childcount>0 and retrieved the values from the database
please see the treeExpand method,where the Expansion event is triggered and every expansion i am sending the
id to the database.
Here i have a global vairable called [ioGlobalDesc = e.getPath().getLastPathComponent().toString();]
where i am holding the current event triggered.
In the expandTree method , this is the method which is being called for every expansion i make ,
Here i will be gettig the values for the node expansion.Now i am setting this value to the
subnode where i am tryting identity the same parent to fix all the child to the same.
for this i have stored my current expansion path and made that as node so that i can fix my childvalues to
this.temp node should actually denote my ioCategory node for which i need to fix the child values.
MyNode temp =(MyNode) loHashMap.get(ioGlobalDesc);
I have another method called createnode to set my child values to the parentnode.Here i am passing the temp as the parameter
which holds the current parent for which i have to fix the values that i have already obtained in the
expandTree method.ioObjExpTree[] holds the childvalues for every expansion i make
My problem is, i am unable to find the same parent for which expansion is made and unable to fix the child nodes.Is there any way to do this?
How do i create both the parent and the child as a dynamic node?
ie is the way i proceeded is right or wrong???????????? i am totally confused.
can any one please help me in solving my problem??????????????
Tell me where i have misunderstood???????????????.or my approach itself is wrong in creating the dynamic tree??
if so how should i do it??????????????????????????????
/****************************setRootNodes start*******************************/
private void setRootNodes(pv.jfcx.PVNode root,ObjVO[] poObjVO) {
int loCount=1;
for (int i = 0; i < poObjVO.length; i++)
if (poObjVO.getInHierarchyLevel() > 0)
MyNode ioCategory = new MyNode(poObjVO[i].getIsHierarchyDesc(), poObjVO[i]. getIsObjID());
loHashMap.put(poObjVO[i].getIsHierarchyDesc(),ioCategory);
root.add(ioCategory);
if (ioObjVO[i].inChildrenCount > 0)
MyNode subNode = new MyNode("","");
ioCategory.add(subNode);
loCount++;
/****************************treeExpanded*************************************/
public void treeExpanded(TreeExpansionEvent e) {
AssMO loAssMO = new AssMO();
for (int i = 0; i < ioObjVO.length; i++)
if (ioObjVO[i].inChildrenCount > 0 && ioObjVO[i].getIsHierarchyDesc().equals(e.getPath().getLastPathComponent().toString()))
ioFirstHit++;
ioGlobalDesc = e.getPath().getLastPathComponent().toString();
e.getPath().getLastPathComponent().toString();
          loAssMO.setPID(ioObjVO[i].getPID());
     break;
if(ioGlobalDesc!=null)
// code goes here for sending the Id to the database which in turn calls my expandTree method which retrieves the
/************************************expandTree Ends here**********************/
public void expandTree(TransferObject poTransferObject) {
     Hashtable output = poTransferObject.getResponseData();
ioObjVOExpTree = null;
     ioObjVOExpTree = (ObjVO[]) output.get("ExpandTree");
MyNode temp =(MyNode) loHashMap.get(ioGlobalDesc);
ioUCSLogger.debug("<--END OF EXPAND tree method-->");
createNodes(temp);
/************************************expandTree Ends here**********************/
/****************************createNodes start*************************************/
private void createNodes(MyNode poParent) {
for(int x=0; x<ioObjVOExpTree.length; x++)
MyNode iosubNode = new MyNode(ioObjVOExpTree[x].getIsHierarchyDesc(),ioObjVOExpTree[x].getIsObjID());
loHashMap.put(ioObjVOExpTree[x].getIsHierarchyDesc(),iosubNode);
poParent.add(iosubNode);
iosubNode.setButton(1,false);

Answer 1

Hi,
I have used Tree Node type to get the nodes.
The model that I use has the following structure:
There is a top node called <b>Ot_Publ_Details</b>. It has 3 child nodes <b>RepObjects, Subagenobjects and Subscrobjects</b>. These child objects internally has two attributes each.
The tree that i have created has Four Treenode types and 3 TreeItem types.
I have bound the data source of the tree node to Ot_Publ_Details. The first TreeNode is also bound to Ot_Publ_Details. The second tree node is bound to the RepObejcts, the third node to the Subagenobjects and the fourth node to Subscrobjects. The 3 treeitem types are mapped to the corresponding child attributes.
when i execute this application, I get a tree with the topnode taking the value from the first treenode while the other 3 nodes doesnt come as node. instead they come as leaf attributes and they display the values present in the attributes.
Hope the model structure and the UI structure is clear.
Regards,
Chander