JTree and Unique node values

Hi,
I am dynamically generating a JTree based on (non-unique) category descriptions found in a database. My trouble is that each node must also be identified by a (hidden) unique node id number.
I have played around with myNode.setUserObject("uniqueNodeNumber");
but that appears to change the title of the node itself.
Any ideas or suggestions would be greatly appreciated.
Thank you!

class UserObject {
    private int id;
    private Object object;
    public UserObject (int id, Object object) {
        this.id = id;
        this.object = object;
    public int getID () {
        return id;
    public Object getObject () {
        return object;
    public String toString () {
        return object.toString ();
}You can add this object to your tree.
Kind regards,
  Levi

Similar Messages

JTree and selected node question

Hello
Is it possible to convert the selected node to an int?
I guess I'm looking for something llike this.
int nodeNumber = node.getSelectedIndex();
There is nothing like that in the API, and it would help greatly if I could find a way do this.
Thanks
Have a good holiday
Jim

From the API for JTree
public int getMinSelectionRow()
Gets the first selected row.
Returns:
an integer designating the first selected row, where 0 is the first row in the display
But I think this is based on how many rows are displayed at the present time and might change if the tree is opened above it.

DnD, JTree and inter-node placement

Hi, there.
Drag'n'Drop with JTrees has been discussed at length in this list. I have a DnD-capable application, and the user sees the nodes affected by the drag position as selected, so he knows where the drop will perform.
Now I want to drop not only on other nodes, but also inbetween. You may imagine there is a red bar shown as soon as the drag is between tree nodes, and the result will be a new node inserted at exactly this position.
Any ideas how to implement that?
Hiran

Still on the problem. Have some thoughts. But absolutely no idea whether this may work at all:
Upon dragover, the cell affected is selected. That means I query getClosestPathForLocation() and then call setSelectionPath with the result. This works for nodes.
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What do you think?

Need to retrieve all the node values of xml using DOM parser..pls help

I want to fetch each node value in this xml file:
<?xml version="1.0" encoding="UTF-8"?>
<Main>
<AAAAA>
<ES>ESValue</ES>
<EI>EIValue</EI>
</AAAAA>
<BBBBB>
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<TB>TBValue</TB>
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output should be the inner text values of diffrent nodes that contain some values..
i.e
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EIValue
STValue
TBValue
PMValue
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AN2Value
CNValue
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pls check the above xml file in proper redable order...I need to parse using DOM and fetch node values that are present...
<?xml version="1.0" encoding="UTF-8"?>
<Main>
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    </BBBBB>
</Main>

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hi,
I have created a JTree node and i want to change the nodes string.
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uma

You can change the value of a path using valueForPathChanged of the TreeModel:
tree.getModel().valueForPathChanged(path, str);

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Hi,
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Welcome to SDN.
I think you should better post it to the BI forum.
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Hello i'm creating a filebrowser for multimedia files (SDK 1.22) such as .jpg .gif .au .wav. (using Swing, JTree, DefaultMutableTreeNode)
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I tried much easier functions to cope with this problem but every time I solve one the "steps" the next problem appears...
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If someone has any idea to solve this problem I would be very pleased!
Thank you anyway by reading this ;)
// part of the code, if you want more detailed info
// @mail: [email protected]
import java.util.Enumeration;
import javax.swing.*;
import javax.swing.tree.*;
// var declaration
static Enumeration en;
static DefaultMutableTreeNode jTreeModel, lastCopiedNode, dmt, insert, insertParent, insertSameFolder;
static String varCut;
static int index= 0;
static int counter = 0;
/* cut function */
if (actionCommand.equals ("cut"))
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     varCut = "cut";
/* paste function */
if (actionCommand.equals ("paste"))
// node is cut
if (varCut == "cut")
// is necessary for first time same folder case
insertParent = dmt;
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// a folder or a file)
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counter = 0;
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varCut = null;
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dmt.removeNodeFromParent (lastCopiedNode);
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}

You need to use a recursive copy method to do this. Here's a simple example of the copy. To do a cut you need to do a copy and then delete the source.
import java.io.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.*;
import java.util.*;
public class CopyTree extends JFrame
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     JTree cTree;
     JScrollPane spTree;
     DefaultTreeModel cModel;
     CNode cRoot;
     JMenuBar menuBar = new JMenuBar();
     JMenu editMenu = new JMenu("Edit");
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     TreePath [] sourcePaths;
     TreePath [] destPaths;
     // =====================================================================
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     CopyTree()
          super("Copy Tree Example");
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          {public void windowClosing(WindowEvent evt){System.exit(0);}});
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          {public void actionPerformed(ActionEvent e){mnuCopy();}});
          editMenu.add(copyItem);
          pasteItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuPaste();}});
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          setJMenuBar(menuBar);
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          cTree = new JTree(cModel);
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          pack();
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          new CopyTree().show();
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     // private methods - User Interface
     private void mnuCopy()
          sourcePaths = cTree.getSelectionPaths();
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          CNode sn,dn;
          int i;
          destPaths = cTree.getSelectionPaths();
          if(1 == destPaths.length)
               dp = destPaths[0];
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                    sp = sourcePaths;
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                         JOptionPane.showMessageDialog
                              (null, "source and destinations overlap","Paste", JOptionPane.ERROR_MESSAGE);
                         return;
               dn = (CNode)dp.getLastPathComponent(); // the node we will append our source to
               for(i=0; i< sourcePaths.length;i++)
                    sn = (CNode)sourcePaths[i].getLastPathComponent();
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               JOptionPane.showMessageDialog
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          for(i = 0; i<sn.getChildCount();i++)
               copyNode((CNode)sn.getChildAt(i),scn);
     // ===================================================================
     // private methods - just a sample tree
     private void buildModel()
          int k = 0;
          cRoot = new CNode("root");
          cModel = new DefaultTreeModel(cRoot);
          CNode n1a = new CNode("n1a");
          cModel.insertNodeInto(n1a,cRoot,k++);
          CNode n1b = new CNode("n1b");
          cModel.insertNodeInto(n1b,cRoot,k++);
          CNode n1c = new CNode("n1c");
          cModel.insertNodeInto(n1c,cRoot,k++);
          CNode n1d = new CNode("n1d");
          cModel.insertNodeInto(n1d,cRoot,k++);
          k = 0;
          CNode n1a1 = new CNode("n1a1");
          cModel.insertNodeInto(n1a1,n1a,k++);
          CNode n1a2 = new CNode("n1a2");
          cModel.insertNodeInto(n1a2,n1a,k++);
          CNode n1a3 = new CNode("n1a3");
          cModel.insertNodeInto(n1a3,n1a,k++);
          CNode n1a4 = new CNode("n1a4");
          cModel.insertNodeInto(n1a4,n1a,k++);
          k = 0;
          CNode n1c1 = new CNode("n1c1");
          cModel.insertNodeInto(n1c1,n1c,k++);
          CNode n1c2 = new CNode("n1c2");
          cModel.insertNodeInto(n1c2,n1c,k++);
     // simple tree node with copy constructor
     class CNode extends DefaultMutableTreeNode
          private String name = "";
          // default constructor
          CNode(){this("");}
          // new constructor
          CNode(String n){super(n);}
          // copy constructor
          CNode(CNode c)
               super(c.getName());
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          public String toString(){return getName();}

Invalidate concept for value node and model node

Hello everybody,
We have invalidate method for value node and model node.
I want to know basic concept behind this method.
What this method acually does?
Regards,
Bhavik

Hi Pran and all,
I figured out the problem. Input parameters are going multple times. So, depending upon that it gives multiple values.
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Root Node
|_ Input_node1
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|_ Input_Node2
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I am passing values in Attr1 and Attr2 attributes.
For this, first of all, i wrote following code.
In controller, i have initialized Root node:
Root_Node model = new Root_Node();
wdcontext.nodeRoot_Node().bind(model);
In view, I set values for attr1 and attr2 using following code:
Ipublic<View>.IInput_node1Element ele = wdcontext.createInput_node1Element();
ele.setAttr1("<value>");
wdcontext.nodeInput_node1().addElement(ele);
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ele1.setAttr2("<value>");
wdcontext.nodeInput_node2().addElement(ele);
But this code didnt work. Model was executed without data in this case.
So, i thought that these elements were created at view level only. And corresponding model objects were not created.
So, I have changed code like following way:
I have removed initialization code for Input_Node1 and Input_Node2 from view. Now, I am getting input values in two different value nodes. And before calling custom controller's method to execute model, I am making two ArrayLists and filling data in it. Now, i am passing these ArrayList objects as parameters to controller's method.
In this method, i am setting both values as follows:
wdcontext.currentRoot_NodeElement().modelObject().setInput_Node1(List1);
wdcontext.currentRoot_NodeElement().modelObject().setInput_Node2(List2);
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But, When i am setting values for Input_Node1 and Input_Node2 as shown above, values are appended instead of overwritting the value. Because of this appended values, it gives mupltiple results.
Means, Both ways are not proper. What should be the proper and best way to pass values in this case?
Thanks,
Bhavik

How to retrieve the nodes from the Database on JTree and many more

I am facing a problem with JTree. I want to retrieve all the nodes from the MS-Access database on the Frame(i.e. Frame will display the JTree), then I also want to perform function like Edit, insert , delete and Drag and Drop opeartion on the JTree and the database should also updated accordingly.
So, if you have any idea or if you have some code to look for then please send it to me.

I am facing a problem with JTree. I want to retrieve all the nodes from the MS-Access database on the Frame(i.e. Frame will display the JTree), then I also want to perform function like Edit, insert , delete and Drag and Drop opeartion on the JTree and the database should also updated accordingly
pls give me code

Difference between value node,model node and recursion node?.

Hi all,
this is to ask you the difference between modal node, value node and recurrsion node?
please explain
Anhitya Kashyap

hi Anhit,
node can be classified as a value node or model node. The difference between value nodes and model nodes is that a value node can store the data itself, whereas the model node only references an external model object that stores the data.
more on nodes check this
http://help.sap.com/saphelp_webas630/helpdata/en/b8/cd96edb9c8794aa362e6e8b4236a1f/frameset.htm
thanks,
Saloni

Default JTree with the colors, sports and food nodes

Hi!
Is there a way to create a JTree with a null root node and no elements without Swing adding the colors, sports and food nodes automatically ?
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Create a new DefaultMutableTreeNode and set it as the root.

Focus Problem with JTree and Menus

Hi all,
I have a problem with focus when editing a JTree and selecting a menu. The problem occurs when the user single clicks on a node, invoking the countdown to edit. If the user quickly clicks on a menu item, the focus will go to the menu item, but then when the countdown finishes, the node now has keyboard focus.
Below is code to reproduce the problem. Click on the node, hover for a little bit, then quickly click on the menu item.
How would I go about fixing the problem? Thanks!
import java.awt.Container;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
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          setRootVisible(true);
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import java.awt.FlowLayout;
import java.util.EventObject;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreeCellRenderer;
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     private TreeCellRenderer m_renderer = null;
     private DefaultTreeModel m_model = null;
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}

You can provide a cell renderer to the JTree to paint the checkBox.
The following code checks or unchecks the box with each click also:
_tree.setCellRenderer(new DefaultTreeCellRenderer()
private JCheckBox checkBox = null;
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                                                boolean leaf,
                                                int row,
                                                boolean hasFocus)
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    checkBox.setSelected(selected);
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});

Need ABAP code to make unique hierarchy values - Request prompt help

hi
<removed>
I am new to SAP. Please help me in the following
I require an ABAP code for the following scenario
I have a simple hieraarchy. The hierarchy is
SEG -> fam -> clas -> comm
The values of the seg , fam, cla, com......all will be charecter values
But in some cases the values will be NOT_KNOWN
If the values are NOT_KNOWN i need to change them as NOT_KNOWN_1, NOT_KNOWN_2...like that unique charecter values
should be replaced for NOT_KNOWN
Example
SEG->FAM->CLA ->COM
Clothing -> Mens wear -> Designer garments -> NOT_KNOWN
Construction -> equipments -> machinery->NOT_KNOWN
Computers -> Laptops -> Imported -> NOT_KNOWN
                 -> desktops ->flat monitors -> Indian
                       -> imported                     -> NOT_KNOWN->
NOT_KNOWN -> baggages
This should be changed to
SEG->FAM->CLA ->COM
Clothing -> Mens wear -> Designer garments -> NOT_KNOWN_1
Construction -> equipments -> machinery->NOT_KNOWN_2
Computers -> Laptops -> Imported -> NOT_KNOWN_3
          -> desktops ->flat monitors -> Indian
                          -> imported
       -> NOT_KNOWN_4 ->
NOT_KNOWN_5 -> baggages
This is to make them unique nodes to upload them in hiereachy
Data is coming from database tables and i was not supposed to do anything in database and the incomin
data needs to finetuned like this to update them in cube
So I like to have some coding which will enable this to work in the start routine
If start routine is not the right option, where else we can do coding
<removed>
Regards
KC

data : w_suff_n(8) type n,
         w_suff_c(8).
loop at data_package.
if data_package-<fieldval> = 'NOT_KNOWN'.
w_suff_n = w_suff_n + 1. w_suff_c = w_suff_n.
shift w_suff_c left deleting leading '0'.
concatenate data_package-<fieldval> w_suff_c into data_package-<fieldval>.
modify data_package.
endif.
endloop.
*Change <fieldval> in the above to the actual field name.

Jtree and checkboxes again

hi there !
I'm trying to build a jtree with jcheckboxes.
But, how do I set/access the (selected) jcheckboxes ?
The selected nodes should be used to generate a DB-query ... how can I get an elegant mapping between the unique identfiers and the nodes ?
Currently I'm using the editor and renderer from
http://saloon.javaranch.com/2/001095.html
(bottom of the page)

reply #10 of the posted link shows you how you can create a JTree with JCheckBox...., if that isn't what you're looking for, I must have misunderstood your question!
;o)
V.V.

JTree Hide Show nodes

Hi All
I have a JTree, and would like to hide some tree nodes based on a certain path, i have been using the setFilter and I can't seem to get to work.
Regards
M
Code fragment below: using the FilterTreeModel
void cmdShowSubset_actionPerformed(ActionEvent e) {
DefaultMutableTreeNode tn = new DefaultMutableTreeNode(value);
FilterTreeModel ftm = new FilterTreeModel(tn);
ftm.setFilterNode(tn);
Object[] oArray = new Object[1];
oArray[0]="ABC communications";
tp = new TreePath(oArray);
subTree.setSelectionPath(tp);
class FilterTreeModel
extends javax.swing.tree.DefaultTreeModel {
DefaultMutableTreeNode filterNode;
public FilterTreeModel(DefaultMutableTreeNode root) {
super(root);
public int getChildCount(Object obj) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) obj;
if (filterNode != null && !filterNode.isNodeDescendant(node)) {
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return super.getChildCount(node);
public Object getChild(Object obj, int num) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) obj;
if (filterNode != null && !filterNode.isNodeDescendant(node)) {
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TreeNode temp = filterNode;
while (!node.isNodeChild(temp)) {
temp = temp.getParent();
return temp;
return null;
return super.getChild(node, num);
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When you post code, please use [code] and [/code] tags as described in Formatting Help on the message entry page. It makes it much easier to read.

JTree and Unique node values

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