Q about tree nodes w. same label (different branches)

Apparently renderer gets confused if it needs to show two nodes with the same label, even though they may be on different branches of the tree. In the pic below, nodes marked "role-read-only" get expanded/closed together - you click on one, they get expanded/closed simultaneously. You hover a mouse on one, the other one gets highlighted.
The tree is in the form of ArrayCollections (with children being other ArrayCollections). How to change this behavior? Am I missing a comparator in a tree or a tree nodes (if so - what's the format?)?
Thanks in advance!

To all who'd like to know the answer.
Problem was that I used Proxy to wrap around business object representing a node. So each node was a Proxy. As soon as I changed wrappers to not be Proxy everything worked fine.
I came to solution after discovering that the described behavior is typical if you use _the_same_ object for two different nodes.
Apparently flex fails to properly compare two different Proxy objects and thinks they are the same. Or perhaps they ARE the same under the hood.

Similar Messages

About tree link

Hi,
working with apex-4.2.
i have created a tree in oracle apex. i want when i click on tree node control move to apex page. how i can create a tree link. if i click on different tree node control move to different apex page .
How i can do this?
Thanks & Regards
Vedant

To create tree, you can use (modify) like the below code,
select case when connect_by_isleaf = 1 then 0
            when level = 1             then 1
            else                           -1
       end as status,
       level,
       "PAGE_NAME" as title,
       null as icon,
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       "PAGE_NAME" as tooltip,
       'f?p='||'&APP_ID.:'||PAGE_ID||':&SESSION.' as link
from "APEX_APPLICATION_PAGES"
WHERE APPLICATION_ID=:APP_ID
connect by prior PAGE_ID=PAGE_GROUP_IDthe best way is, you can create a table with page details in your DB and use that table to create tree. Make sure that you have to insert into the page details if you create any new page.
Thanks,
Lakshmi

Create a tree node and show the report on the same page

Hi,
I have created a tree for our organization and each node represents a unit. The top one is office level and followed by division and brach.
I have created a reprot on the same page as the tree node.
What I want to do is:
I would like to click a specific node and the report shows only that node and bellow. So, If I click division A and division A has two branch. my report shows only those two braches that bellong to division A.
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The only way it could work is using iframes. Now OBIEE 11g would not allow iframes inside it's dashboard. It offers a dashboard object called "Embedded content" which is a restricted iframe kinda thing but unless you get this object's id from generated HTML you can change it's content dynamically. Besides, such an implementation may break with next patch. So here is an idea.
Create a HTML page with two iframes, left one will hold all the reports with links (you can always generate a list of reports through catalog manager, open it in excel and make HTML links from it) that open report urls (in the format of ./saw.dll?GO&Path=....) in right iframe (using javascript open.window method). Once that page is working, call this page from dashboard using an action link. This is slightly twisted approach but at least it would give you what you asked for.
About making the report list dynamic, I am afraid there are no easy answers. OBIEE provides web service that will allow the users to query catalog to get a list of reports. You can try some basic JSP to access the web service and generate the list dynamically. But that is not something I can provide here.

Add_tree_data - tree node label cannot be null

I have a hierarchical tree displayed and when the user expands a node I'm calling add_tree_data using a record group to add items to the expanded node.
This works for the first node I expand, if I try to expand another node I get frm-47337 Tree node label cannot be null. I'm using the same record group as before so I cant see why I'm getting the error. Thanks for any help.

Hi,
Which line you are getting the below?
java.lang.ClassCastException: java.lang.Integer cannot be cast to oracle.jbo.Key~Abhijit

Tree item when-tree-node-selected fires differently from 6i to 10g.

In forms 6i, when you keyboard navigate between tree nodes, the wtns trigger will fire. In 10g it does not. In 10g, it will fire if you press the tab key or mouse click on a node.
Anyone know if this was done on purpose?
I ran into this after finally trying my props.fmb in 10g. It works fine in 6i, but not in 10g
copy of my form is here:
http://www.tailboom.com/oracle.php
Forms [32 Bit] Version 6.0.8.18.3 (Production) cleint server
Forms [32 Bit] Version 10.1.2.0.2 (Production)
I wrote most of the tree handling code for oracle apps APPTREE. This is the code that most if not all tree's in apps uses to build standard tree. So I have a pretty good understanding of the forms tree item. And know the wtns fired for web forms 6i on every node like 6i client server. This is very strange IMO.
Thanks.
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Oleg,
thanks for the reference. Although the bug you identify deals with when-tree-node-activated, it is possible they fixed the when-tree-node-selected issue at the same time. With my test tree, i can currently duplicate both issues. I tried to download the patch, but it is only available for linux and unix. No windows patch. I don't have my linux env up and running to where I can test yet. So I can not confirm.
--pat

How to trigger an ActionListener in different class on click of a tree node

Hi guyz,
There are three panels inside my main Frame
-->TopPanel,MiddlePanel and BottomPanel. I have a tree structure inside a panel. This panel along with couple more panels is in MiddlePanel. My main class is "mainClass.java". Inside that i have an actionListener for a specific button. I need to trigger that actionListener when i click one of the tree nodes in the panel i specified before. The problem is that my MiddlePanel is itself a different ".java" file which is being called in my "mainClass" when a specific button is clicked. There are different buttons in my "mainClass" file and for each one i am creating different MiddlePanels depending on the buttons clicked.
So, if i click the tree node, i need to remove the MiddlePanel and recreate the MiddlePanel(One that will be created when a different button in the mainClass file is clicked). i.e., i need to trigger the actionListener for that corresponding button. Is there a way to do it?

use this code to call different panel by selecting tree node.....ok
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.sql.SQLException;
import javax.swing.event.*;
class MainTree extends JFrame
private static final long serialVersionUID = 1L;
 CardLayout cl = new CardLayout();
 JPanel panel = new JPanel(cl);
public MainTree() throws Exception
JPanel blankPanel = new JPanel();
blankPanel.setBorder(BorderFactory.createTitledBorder("Blank Panel"));
panel.add(blankPanel,"0");
panel.add(blankPanel,BorderLayout.CENTER);
 panel.setPreferredSize(new Dimension(800, 100));
 setSize(1000, 700);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// getContentPane().setLayout(new GridLayout(1,2));
getContentPane().setLayout(new BorderLayout());
ConfigTree test = new ConfigTree();
DefaultMutableTreeNode mainTree = (DefaultMutableTreeNode)test.buildTree();
JTree tree = new JTree(mainTree);
tree.setCellRenderer(new DefaultTreeCellRenderer(){
private static final long serialVersionUID = 1L;
 public Component getTreeCellRendererComponent(JTree tree,Object value,
boolean sel,boolean expanded,boolean leaf,int row,boolean hasFocus){
JLabel lbl = (JLabel)super.getTreeCellRendererComponent(tree,value,sel,expanded,leaf,row,hasFocus);
NodeWithID node = (NodeWithID)((DefaultMutableTreeNode)value).getUserObject();
if(node.icon != null)lbl.setIcon(node.icon);
return lbl;
getContentPane().add(new JScrollPane(tree));
loadCardPanels((DefaultMutableTreeNode)((DefaultTreeModel)tree.getModel()).getRoot());
getContentPane().add(panel,BorderLayout.EAST);
 getContentPane().add(blankPanel,BorderLayout.WEST);
// getContentPane().add(panel);
tree.addTreeSelectionListener(new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent tse){
NodeWithID node =(NodeWithID)((DefaultMutableTreeNode)((TreePath)tse.getPath())
.getLastPathComponent()).getUserObject();
if(node.nodePanel != null)
String cardLayoutID = node.ID;
cl.show(panel,cardLayoutID);
cl.show(panel,"0");
public void loadCardPanels(DefaultMutableTreeNode dmtn)
for(int x = 0; x < dmtn.getChildCount(); x++)
if(((DefaultMutableTreeNode)dmtn.getChildAt(x)).isLeaf() == false)
loadCardPanels((DefaultMutableTreeNode)dmtn.getChildAt(x));
NodeWithID node = (NodeWithID)((DefaultMutableTreeNode)dmtn.getChildAt(x)).getUserObject();
if(node.nodePanel != null)
String cardLayoutID = node.ID;
panel.add(cardLayoutID,node.nodePanel);
public static void main(String[] args) throws Exception{new MainTree().setVisible(true);}
class ConfigTree
public Object buildTree() throws Exception
NodeWithID n0 = new NodeWithID("HelpDesk","");
NodeWithID n1 = new NodeWithID("Administrator",n0.nodeName);
NodeWithID n2 = new NodeWithID("Report Form",n1.nodeName,new Tree().getContentPane());
NodeWithID n3 = new NodeWithID("Create User",n2.nodeName,new JPanel());
NodeWithID n4 = new NodeWithID("Unlock User",n2.nodeName,new unlockui().getContentPane());
NodeWithID n5 = new NodeWithID("List User",n2.nodeName,new JPanel());
NodeWithID n6 = new NodeWithID("Assign Role",n2.nodeName,new AssignRole());
NodeWithID n9 = new NodeWithID("Operator",n1.nodeName,new JPanel());
NodeWithID n10 = new NodeWithID("Create Ticket",n9.nodeName,new JPanel());
NodeWithID n11 = new NodeWithID("My Ticket",n9.nodeName,new JPanel());
NodeWithID n12 = new NodeWithID("All Ticket",n9.nodeName,new JPanel());
NodeWithID n13 = new NodeWithID("Event Viewer",n1.nodeName,new JPanel());
DefaultMutableTreeNode top = new DefaultMutableTreeNode(n0);
DefaultMutableTreeNode branch1 = new DefaultMutableTreeNode(n1);
top.add(branch1);
DefaultMutableTreeNode node1_b1 = new DefaultMutableTreeNode(n2);
DefaultMutableTreeNode n1_node1_b1 = new DefaultMutableTreeNode(n3);
DefaultMutableTreeNode n2_node1_b1 = new DefaultMutableTreeNode(n4);
DefaultMutableTreeNode n3_node1_b1 = new DefaultMutableTreeNode(n5);
DefaultMutableTreeNode n4_node1_b1 = new DefaultMutableTreeNode(n6);
branch1.add(node1_b1);
branch1.add(n1_node1_b1);
branch1.add(n2_node1_b1);
branch1.add(n3_node1_b1);
branch1.add(n4_node1_b1);
DefaultMutableTreeNode node4_b1 = new DefaultMutableTreeNode(n9);
DefaultMutableTreeNode n1_node4_b1 = new DefaultMutableTreeNode(n10);
DefaultMutableTreeNode n2_node4_b1 = new DefaultMutableTreeNode(n11);
DefaultMutableTreeNode n3_node4_b1 = new DefaultMutableTreeNode(n12);
node4_b1.add(n1_node4_b1);
node4_b1.add(n2_node4_b1);
node4_b1.add(n3_node4_b1);
DefaultMutableTreeNode node5_b1 = new DefaultMutableTreeNode(n13);
branch1.add(node1_b1);
branch1.add(node4_b1);
branch1.add(node5_b1);
return top;
class NodeWithID
String nodeName;
String ID;
JPanel nodePanel;
ImageIcon icon;
public NodeWithID(String nn,String parentName)
nodeName = nn;
ID = parentName+" - "+nodeName;
public NodeWithID(String nn,String parentName,Container container)
this(nn,parentName);
nodePanel = (JPanel) container;
nodePanel.setBorder(BorderFactory.createTitledBorder(ID + " Panel"));
public NodeWithID(String nn,String parentName,JPanel p, ImageIcon i)
this(nn,parentName,p);
icon = i;
public String toString(){return nodeName;}
}

A theory about trees (ApEx 4.0) regarding save activated node

Hallo all!
Can someone please confirm (or not) my theory about trees regarding save activated node in ApEx 4.0(.1):
With my first tree I tried to set a varchar2-value for the last selected node ... didn't work. After many tries I was succesful with changing this to a numeric value...
...Is this a bug or a feature? ;-)
Btw.
Another supposing regarding the source-code of trees is that this can't be longer than 4000 bytes. Is this right?
And if so ... can I put a Funktion in there that returns the statement (like in classic reports, but with static row-structure)?
Hope this time someone out there is attends my thread.
With kind regards...
...kc7

Hi,
Pre-Apex4 you could make use of the A1 and A2 columns in the tree SQL along with the tree template to conditional set the color of the node text. Does anyone know how to achieve this in Apex4? I've tried using the tree SQL shown below but this displays the HTML (SPAN tags) as text.
select case when connect_by_isleaf = 1 then 0
 when level = 1 then 1
 else -1
 end as status,
 level,
 ''||"ENAME"||'' as title,
 null as icon,
 "EMPNO" as value,
 null as tooltip,
 null as link
from "#OWNER#"."EMP"
start with "MGR" is null
connect by prior "EMPNO" = "MGR"
order siblings by "ENAME"Any assistance would be appreciated.
Cheers.

Different service orders have the same label

Hi
i have different service orders to create.( x service order, y service order ...). when i am clicking to create new service order of any type, the label is not changing.
the same label New: Service order is coming. I want to change the label New:Service order to x service order or y service order..... depends on selection
please suggest.
ram

hi ram,
i guess u r not changing the long description of service order for that matter.
change that and see

Expand tree node by clicking onto the node label

I have followed this example to expand the nodes with a clic on the tree :
[http://www.oracle.com/technetwork/developer-tools/adf/learnmore/20-expand-tree-node-from-label-169156.pdf]
My code:
JSPX:
<af:resource type="javascript" source="js/glasspane.js"/>
<af:tree value="#{bindings.OpcionesPadreView1.treeModel}" var="node"
rowSelection="single" id="t1" partialTriggers=":::cbNuevCpta"
binding="#{pageFlowScope.GestionDocumentos.t1}"
selectionListener="#{bindings.OpcionesPadreView1.treeModel.makeCurrent}">
<f:facet name="nodeStamp">
<af:commandImageLink text="#{node.Gesdopcach}" id="ot1"
action="#{bindings.LoadDir.execute}"
actionListener="#{bindings.LoadFile.execute}"
icon="/images/GestionDocumentos/folder20x20.png"
partialSubmit="true">
</af:commandImageLink>
</f:facet>
<af:clientListener method="expandTree" type="selection"/>
</af:tree>
Js:
function expandTree(evt) {
alert('In');
var tree = event.getSource();
rwKeySet = event.getAddedSet();
var firstRowKey;
for (rowKey in rwKeySet) {
firstRowKey = rowKey;
if (tree.isPathExpanded(firstRowKey)) {
tree.setDisclosedRowKey(firstRowKey, false);
}else {
tree.setDisclosedRowKey(firstRowKey, true);
When i clic on the labels the tree doesn't expand, the alert also is not shown. The problem could be the <af:resource>, but i have this tag in all my pages and all javascripts work. I also changed the commandLink with an outputText, but doesn't work.
Edited by: Miguel Angel on 21/06/2012 12:53 PM

At least the call the javascript works, but this line doesn't work, anybody know why?:
rwKeySet = evt.getAddedSet();

Programatically select a different tree node.

I have constructed the tree using ChildPropertyTreeModel. How do I programatically select another node in the tree? Also, after programatically selecting the tree node, does the model get reflected so that model.getRowKey() returns the newly selected node?

In order to programatically select another node in the tree, you can use the following:
tree.getSelectedRowKeys().clear();
tree.getSelectedRowKeys().add( newKey );In order to have the tree point at the newly selected node, use the following:
tree.setRowKey( newKey );If you do this tree.getRowKey() will point to the new one. If you don't do this I'm pretty sure tree.getRowKey() will just point at whatever it was pointing at before. Also it's important when you make changes like this to refresh the content of the tree, which can be done using RequestContext.getCurrentInstance().addPartialTarget( tree ).

Help with building a JTree using tree node and node renderers

Hi,
I am having a few problems with JTree's. basically I want to build JTree from a web spider. The webspide searches a website checking links and stores the current url that is being processed as a string in the variable msg. I wan to use this variable to build a JTree in a new class and then add it to my GUI. I have created a tree node class and a renderer node class, these classes are built fine. can someone point me in the direction for actually using these to build my tree in a seperate class and then displaying it in a GUI class?
*nodeRenderer.java
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.net.*;
public class nodeRenderer extends DefaultTreeCellRenderer
 implements TreeCellRenderer
public static Icon icon= null;
public nodeRenderer() {
icon = new ImageIcon(getClass().getResource("icon.gif"));
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
treeNode node = (treeNode)(((DefaultMutableTreeNode)value).getUserObject());
if(icon != null) // set a custom icon
setOpenIcon(icon);
setClosedIcon(icon);
setLeafIcon(icon);
 return this;
*treeNode.java
*this is the class to represent a node
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
import java.net.*;
* Class used to hold information about a web site that has
* been searched by the spider class
public class treeNode
*Url from the WebSpiderController Class
*that is currently being processed
public String msg;
treeNode(String urlText)
 msg = urlText;
String getUrlText()
 return msg;
//gui.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
 *declare variable, boolean
 *thread, a object and a center
 *pane
 protected URL urlInput;
 protected Thread bgThread;
 protected boolean run = false;
 protected WebSpider webSpider;
 public gui()
 *create the gui here
 setTitle("Testing Tool");
 setSize(600,600);
 //add Buttons to the tool bar
 start.setText("Start");
 start.setActionCommand("Start");
 toolBar.add(start);
 ButtonListener startListener = new ButtonListener();
 start.addActionListener(startListener);
 cancel.setText("Cancel");
 cancel.setActionCommand("Cancel");
 toolBar.add(cancel);
 ButtonListener cancelListener = new ButtonListener();
 cancel.addActionListener(cancelListener);
 close.setText("Close");
 close.setActionCommand("Close");
 toolBar.add(close);
 ButtonListener closeListener = new ButtonListener();
 close.addActionListener(closeListener);
 //creat a simple form
 urlLabel.setText("Enter URL:");
 urlLabel.setBounds(100,36,288,24);
 formTab.add(urlLabel);
 url.setBounds(170,36,288,24);
 formTab.add(url);
 current.setText("Currently Processing: ");
 current.setBounds(100,80,288,24);
 formTab.add(current);
 //add scroll bars to the error messages screen and website structure
 errorPane.setAutoscrolls(true);
 errorPane.setHorizontalScrollBarPolicy(javax.swing.
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 errorPane.setVerticalScrollBarPolicy(javax.swing.
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 errorPane.setOpaque(true);
 errorTab.add(errorPane);
 errorPane.setBounds(0,0,580,490);
 errorText.setEditable(false);
 errorPane.getViewport().add(errorText);
 errorText.setBounds(0,0,600,550);
 treePane.setAutoscrolls(true);
 treePane.setHorizontalScrollBarPolicy(javax.swing.
 ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
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 treePane.setOpaque(true);
 treeTab.add(treePane);
 treePane.setBounds(0,0,580,490);
 treeText.setEditable(false);
 treePane.getViewport().add(treeText);
 treeText.setBounds(0,0,600,550);
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centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
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 getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
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 javax.swing.JPanel toolBar = new javax.swing.JPanel();
 javax.swing.JButton start = new javax.swing.JButton();
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 javax.swing.JButton close = new javax.swing.JButton();
 javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
 javax.swing.JPanel formTab = new javax.swing.JPanel();
 javax.swing.JLabel urlLabel = new javax.swing.JLabel();
 javax.swing.JLabel current = new javax.swing.JLabel();
 javax.swing.JTextField url = new javax.swing.JTextField();
 javax.swing.JPanel errorTab = new javax.swing.JPanel();
 javax.swing.JTextArea errorText = new javax.swing.JTextArea();
 javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
 javax.swing.JPanel treeTab = new javax.swing.JPanel();
 javax.swing.JTextArea treeText = new javax.swing.JTextArea();
 javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
 javax.swing.JTree searchTree = new javax.swing.JTree();
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 public static void main(String args[])
 (new gui()).setVisible(true);
 *listen for the button presses and set the
 *boolean flag depending on which button is pressed
 class ButtonListener implements ActionListener
 public void actionPerformed(ActionEvent event)
 Object object = event.getSource();
 if (object == start)
 run = true;
 startActionPerformed(event);
 if (object == cancel)
 run = false;
 startActionPerformed(event);
 if (object == close)
 System.exit(0);
 *this method is called when the start or
 *cancel button is pressed.
 void startActionPerformed (ActionEvent event)
 if (run == true && bgThread == null)
 bgThread = new Thread(this);
 bgThread.start();
 if (run == false && bgThread != null)
 webSpider.cancel();
 *this mehtod will start the background thred.
 *the background thread is required so that the
 *GUI is still displayed
 public void run()
 try
 webSpider = new WebSpider(this);
 webSpider.clear();
 urlInput = new URL(url.getText());
 webSpider.addURL(urlInput);
 webSpider.run();
 bgThread=null;
 catch (MalformedURLException e)
 addressError addErr = new addressError();
 addErr.addMsg = "URL ERROR - PLEASE CHECK";
 SwingUtilities.invokeLater(addErr);
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 *once a url is found. Validation of navigation
 *happens here.
 public boolean urlFound(URL urlInput,URL url)
 CurrentlyProcessing pro = new CurrentlyProcessing();
 pro.msg = url.toString();
 SwingUtilities.invokeLater(pro);
 if (!testLink(url))
 navigationError navErr = new navigationError();
 navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
 return false;
 if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
 return false;
 else
 return true;
 *this method is called internally to check
 *that a link works
 protected boolean testLink(URL url)
 try
 URLConnection connection = url.openConnection();
 connection.connect();
 return true;
 catch (IOException e)
 return false;
 *this method is called when an error is
 *found.
 public void URLError(URL url)
 *this method is called when an email
 *address is found
 public void emailFound(String email)
 /*this method will update any errors found inc
 *address errors and broken links
 class addressError implements Runnable
 public String addMsg;
 public void run()
 errorText.append(addMsg);
 current.setText("Currently Processing: "+ addMsg);
 class navigationError implements Runnable
 public String navMsg;
 public void run()
 errorText.append(navMsg);
 *this method will update the currently
 *processing field on the GUI
 class CurrentlyProcessing implements Runnable
 public String msg;
 public void run()
 current.setText("Currently Processing: " + msg );
//webspider.java
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.tree.*;
import javax.swing.*;
*this class implements the spider.
public class WebSpider extends HTMLEditorKit
 *make a collection of the URL's
 protected Collection urlErrors = new ArrayList(3);
 protected Collection urlsWaiting = new ArrayList(3);
 protected Collection urlsProcessed = new ArrayList(3);
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 protected gui report;
 *this flag will indicate whether the process
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 protected boolean cancel = false;
 *The constructor
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 public WebSpider(gui report)
 this.report = report;
 *get the urls from the above declared
 *collections
 public Collection getUrlErrors()
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 return urlsWaiting;
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 return urlsProcessed;
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 getUrlErrors().clear();
 getUrlsWaiting().clear();
 getUrlsProcessed().clear();
 *Set a flag that will cause the begin
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 public void cancel()
 cancel = true;
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 if (getUrlsWaiting().contains(url))
 return;
 if (getUrlErrors().contains(url))
 return;
 if (getUrlsProcessed().contains(url))
 return;
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 getUrlsWaiting().add(url);
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 public void processURL(URL url)
 try
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 URLConnection connection = url.openConnection();
 if ((connection.getContentType()!=null) &&
 !connection.getContentType().toLowerCase().startsWith("text/"))
 getUrlsWaiting().remove(url);
 getUrlsProcessed().add(url);
 log("Not processing because content type is: " +
 connection.getContentType() );
 return;
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 InputStream is = connection.getInputStream();
 Reader r = new InputStreamReader(is);
 // parse the URL
 HTMLEditorKit.Parser parse = new HTMLParse().getParser();
 parse.parse(r,new Parser(url),true);
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 getUrlsWaiting().remove(url);
 getUrlErrors().add(url);
 log("Error: " + url );
 report.URLError(url);
 return;
// mark URL as complete
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Complete: " + url );
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public void run()
cancel = false;
while (!getUrlsWaiting().isEmpty() && !cancel)
 Object list[] = getUrlsWaiting().toArray();
 for (int i=0;(i<list.length)&&!cancel;i++)
 processURL((URL)list);
* A HTML parser callback used by this class to detect links
protected class Parser extends HTMLEditorKit.ParserCallback
protected URL urlInput;
public Parser(URL urlInput)
this.urlInput = urlInput;
public void handleSimpleTag(HTML.Tag t,MutableAttributeSet a,int pos)
String href = (String)a.getAttribute(HTML.Attribute.HREF);
if((href==null) && (t==HTML.Tag.FRAME))
href = (String)a.getAttribute(HTML.Attribute.SRC);
if (href==null)
return;
int i = href.indexOf('#');
if (i!=-1)
href = href.substring(0,i);
if (href.toLowerCase().startsWith("mailto:"))
report.emailFound(href);
return;
handleLink(urlInput,href);
public void handleStartTag(HTML.Tag t,MutableAttributeSet a,int pos)
handleSimpleTag(t,a,pos); // handle the same way
protected void handleLink(URL urlInput,String str)
try
 URL url = new URL(urlInput,str);
if (report.urlFound(urlInput,url))
addURL(url);
catch (MalformedURLException e)
log("Found malformed URL: " + str);
*log the information of the spider
public void log(String entry)
System.out.println( (new Date()) + ":" + entry );
I have a seperate class for parseing the HTML. Any help would be greatly appreciated
mrv

Hi Sorry to be a pain again,
I have re worked the gui class so it looks like this now:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
 *declare variable, boolean
 *thread, a object and a center
 *pane
 protected URL urlInput;
 protected Thread bgThread;
 protected boolean run = false;
 protected WebSpider webSpider;
 public String msgInfo;
 public String brokenUrl;
 public String goodUrl;
 public String deadUrl;
 protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
 public gui()
 *create the gui here
 setTitle("Testing Tool");
 setSize(600,600);
 //add Buttons to the tool bar
 start.setText("Start");
 start.setActionCommand("Start");
 toolBar.add(start);
 ButtonListener startListener = new ButtonListener();
 start.addActionListener(startListener);
 cancel.setText("Cancel");
 cancel.setActionCommand("Cancel");
 toolBar.add(cancel);
 ButtonListener cancelListener = new ButtonListener();
 cancel.addActionListener(cancelListener);
 close.setText("Close");
 close.setActionCommand("Close");
 toolBar.add(close);
 ButtonListener closeListener = new ButtonListener();
 close.addActionListener(closeListener);
 //creat a simple form
 urlLabel.setText("Enter URL:");
 urlLabel.setBounds(100,36,288,24);
 formTab.add(urlLabel);
 url.setBounds(170,36,288,24);
 formTab.add(url);
 current.setText("Currently Processing: ");
 current.setBounds(100,80,288,24);
 formTab.add(current);
 //add scroll bars to the error messages screen and website structure
 errorPane.setAutoscrolls(true);
 errorPane.setHorizontalScrollBarPolicy(javax.swing.
 ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
 errorPane.setVerticalScrollBarPolicy(javax.swing.
 ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
 errorPane.setOpaque(true);
 errorTab.add(errorPane);
 errorPane.setBounds(0,0,580,490);
 errorText.setEditable(false);
 errorPane.getViewport().add(errorText);
 errorText.setBounds(0,0,600,550);
 treePane.setAutoscrolls(true);
 treePane.setHorizontalScrollBarPolicy(javax.swing.
 ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
 treePane.setVerticalScrollBarPolicy(javax.swing.
 ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
 treePane.setOpaque(true);
 treeTab.add(treePane);
 treePane.setBounds(0,0,580,490);
 treeText.setEditable(false);
 treePane.getViewport().add(treeText);
 treeText.setBounds(0,0,600,550);
 //JTree
 // NEW CODE
 rootNode = new DefaultMutableTreeNode("Root Node");
 treeModel = new DefaultTreeModel(rootNode);
 treeModel.addTreeModelListener(new MyTreeModelListener());
 tree = new JTree(treeModel);
 tree.setEditable(true);
 tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
 treeText.add(tree);
 //create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
 //add the tool bar and tabbed pane
 getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
 *create the tool bar pane, a center pane, add the buttons,
 *labels, tabs, a text field for user input here
 javax.swing.JPanel toolBar = new javax.swing.JPanel();
 javax.swing.JButton start = new javax.swing.JButton();
 javax.swing.JButton cancel = new javax.swing.JButton();
 javax.swing.JButton close = new javax.swing.JButton();
 javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
 javax.swing.JPanel formTab = new javax.swing.JPanel();
 javax.swing.JLabel urlLabel = new javax.swing.JLabel();
 javax.swing.JLabel current = new javax.swing.JLabel();
 javax.swing.JTextField url = new javax.swing.JTextField();
 javax.swing.JPanel errorTab = new javax.swing.JPanel();
 javax.swing.JTextArea errorText = new javax.swing.JTextArea();
 javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
 javax.swing.JPanel treeTab = new javax.swing.JPanel();
 javax.swing.JTextArea treeText = new javax.swing.JTextArea();
 javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
 javax.swing.JTree tree = new javax.swing.JTree();
 *show the gui
 public static void main(String args[])
 (new gui()).setVisible(true);
 *listen for the button presses and set the
 *boolean flag depending on which button is pressed
 class ButtonListener implements ActionListener
 public void actionPerformed(ActionEvent event)
 Object object = event.getSource();
 if (object == start)
 run = true;
 startActionPerformed(event);
 if (object == cancel)
 run = false;
 startActionPerformed(event);
 if (object == close)
 System.exit(0);
 *this method is called when the start or
 *cancel button is pressed.
 void startActionPerformed (ActionEvent event)
 if (run == true && bgThread == null)
 bgThread = new Thread(this);
 bgThread.start();
 //new line of code
 treeText.addObject(msgInfo);
 if (run == false && bgThread != null)
 webSpider.cancel();
 *this mehtod will start the background thred.
 *the background thread is required so that the
 *GUI is still displayed
 public void run()
 try
 webSpider = new WebSpider(this);
 webSpider.clear();
 urlInput = new URL(url.getText());
 webSpider.addURL(urlInput);
 webSpider.run();
 bgThread = null;
 catch (MalformedURLException e)
 addressError addErr = new addressError();
 addErr.addMsg = "URL ERROR - PLEASE CHECK";
 SwingUtilities.invokeLater(addErr);
 *this method is called by the web spider
 *once a url is found. Validation of navigation
 *happens here.
 public boolean urlFound(URL urlInput,URL url)
 CurrentlyProcessing pro = new CurrentlyProcessing();
 pro.msg = url.toString();
 SwingUtilities.invokeLater(pro);
 if (!testLink(url))
 navigationError navErr = new navigationError();
 navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
 brokenUrl = url.toString();
 return false;
 if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
 return false;
 else
 return true;
 *this method is returned if there is no link
 *on a web page, e.g. there us a dead end
 public void urlNotFound(URL urlInput)
 deadEnd dEnd = new deadEnd();
 dEnd.dEMsg = "No links on "+urlInput+"\n";
 deadUrl = urlInput.toString();
 *this method is called internally to check
 *that a link works
 protected boolean testLink(URL url)
 try
 URLConnection connection = url.openConnection();
 connection.connect();
 goodUrl = url.toString();
 return true;
 catch (IOException e)
 return false;
 *this method is called when an error is
 *found.
 public void urlError(URL url)
 *this method is called when an email
 *address is found
 public void emailFound(String email)
 /*this method will update any errors found inc
 *address errors and broken links
 class addressError implements Runnable
 public String addMsg;
 public void run()
 current.setText("Currently Processing: "+ addMsg);
 errorText.append(addMsg);
 class navigationError implements Runnable
 public String navMsg;
 public void run()
 errorText.append(navMsg);
 class deadEnd implements Runnable
 public String dEMsg;
 public void run()
 errorText.append(dEMsg);
 *this method will update the currently
 *processing field on the GUI
 public class CurrentlyProcessing implements Runnable
 public String msg;
 //new line
 public String msgInfo = msg;
 public void run()
 current.setText("Currently Processing: " + msg );
 * NEW CODE
 * NEED THIS CODE SOMEWHERE
 * treeText.addObject(msgInfo);
 public DefaultMutableTreeNode addObject(Object child)
 DefaultMutableTreeNode parentNode = null;
 TreePath parentPath = tree.getSelectionPath();
 if (parentPath == null)
 parentNode = rootNode;
 else
 parentNode = (DefaultMutableTreeNode)
(parentPath.getLastPathComponent());
 return addObject(parentNode, child, true);
 public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child)
 return addObject(parent, child, false);
 public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
 Object child,boolean shouldBeVisible)
 DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(child);
 if (parent == null)
 parent = rootNode;
 treeModel.insertNodeInto(childNode, parent, parent.getChildCount());
 if (shouldBeVisible)
 tree.scrollPathToVisible(new TreePath(childNode.getPath()));
 return childNode;
 public class MyTreeModelListener implements TreeModelListener
 public void treeNodesChanged (TreeModelEvent e)
 DefaultMutableTreeNode node;
 node = (DefaultMutableTreeNode)
 (e.getTreePath().getLastPathComponent());
 try
 int index = e.getChildIndices()[0];
 node = (DefaultMutableTreeNode)
 (node.getChildAt(index));
 catch (NullPointerException exc)
 public void treeNodesInserted(TreeModelEvent e)
 public void treeStructureChanged(TreeModelEvent e)
 public void treeNodesRemoved(TreeModelEvent e)
I beleive that this line of code is required:
treeText.addObject(msgInfo);
I have placed it where the action events start the spider, but i keep getting this error:
cannot resolve symbol
symbol : method addObject (java.lang.String)
location: class javax.swing.JTextArea
treeText.addObject(msgInfo);
Also the jtree is not showing the window that I want it to and I am not too sure why. could you have a look to see why? i think it needs a fresh pair of eyes.
Many thanks
MrV

WHEN-TREE-NODE-SELECTED

Hello alllll
i have a master-detail block besides a tree block
All i wanna do Simply and logically is to select a tree node then a Master-Detail records related to this tree node is to be retrieved...
_i have the following code in the WHEN-TREE-NODE-SELECTED Trigger as follow:_
DECLARE
htree ITEM;
 node_value VARCHAR2(100);
BEGIN
IF :SYSTEM.TRIGGER_NODE_SELECTED = 'TRUE' THEN
-- Find the tree itself.
htree := FIND_ITEM ('BL_TREE.IT_TREE');
-- Find the value of the node clicked on.
NODE_VALUE := FTREE.GET_TREE_NODE_PROPERTY( htree, :SYSTEM.TRIGGER_NODE , Ftree.NODE_LABEL );
 GO_BLOCK ('STP_COMPANIES');
EXECUTE_QUERY;
 END IF;
END;The above code retrieved data as a whole
but i want 2 filter the data selected from the tree node as i said 2 be displayed as filtered by the tree selection.
so i used the following code as follow:
GO_BLOCK ('GL_COST_CENTERS');
 set_block_property('GL_COST_CENTERS', DEFAULT_WHERE, 'COMPANY_ID ='||
 ftree.get_tree_node_property('BL_TREE.IT_TREE', :SYSTEM.TRIGGER_NODE, FTREE.NODE_VALUE));
EXECUTE_QUERY;Any help will be appreciated...
Thanks in Advance..
Regards,
Abdetu...

Hello thanks for reply,
STP_COMPANIES your detail block? no it's the master
gets the "Label" of the tree node not the value of the selected nodei tried both but nothing retrieved...!
i thought that the value is the serial of the node and the lable is the text displayed on the tree node no ?
Is this code in the same When-Tree-Node-Selected trigger or a different trigger?yes WHEN-TREE-NODE-SELECTED as my post titled...
is GL_COST_CENTERS the master block? no it's the detail ; every company --- has many <- cost centers
are the tables related? yes
just query the master table and the detail table will automatically be filter through the relationship?i did and it works filtering through the company_id, But what i wanna do is 2 filter the data displayed in the two block Master-Detail according 2 the selection of the tree
Say i selected the ....
 + Assets node
 |
 |------ - Furnitures 's node is selected so alll the related details of the furniture is displayed in the Master-BLock
 | |
 | +----chairs
 | |
 | +----tables
 |
 +----- LAnds
 |So the Tree is used 2 Query or retrieved the selected node's data accordingly...
hope i well explained my issue ..!
is it possible 2 do that ?!
Thanks Again..
Regards,
Abdetu...

Invalid B tree node size- Computer won't start up anymore

Get the kernel panic/restart messsage - when I restart same thing.... Tried all of the solutions Apple suggest- re-setting PRAM, holding the "X" key, holding the "option" key... nothing seems to work. Ran the OSX install CD and went to utilites, tried to repair the disk that way- but get the message- " Invalid B Tree node size, volume check failed. Error: The underlying task reported failure on exit. IHFS Volume checked - Volume could not be repaired beause of an error.
CD would also not let me re- install OS X
Currently using OS X 10.4.9 on a G4 iMac

Owen:
Thank you for posting back with an update of your situation. I am glad you were able to work your way through your issues and secure your Users Folder. Data Resuce II is a great tool.
I have been using different versions of TechTool Pro since OS 9 and have found it to be a great tool. It has saved me from disaster several times. I use TechTool Pro 4.5.2 on Tiger. I am not sure what version you were using, but if, indeed, TTP damaged your data, and I have serious doubts about that, it could be that you were using the wrong version.
Having a good backup strategy is very important. You will find some good hints in Dr. Smoke's FAQ Backup and Recovery. My main difference with Dr. Smoke is the he insists on using Retrospect as his backup software, whereas I have never been able to get it to work. Besides, you will find that SuperDuper is much friendlier and efficient. Indeed, SuperDuper was rated the best backup software in tests. And no need to wait for Leopard to do scheduled backups. SuperDuper will do that, too.
Again, I am glad your issue has been resolved. Use Disk Warrior regularly to rebuild your directories and follow a regular maintenance schedule such as the one Gulliver suggests in his article Mac OS X System Maintenance.
Happy Mac Computing.
cornelius
Message was edited by: cornelius

Useful Code of the Day: Hideable Tree Nodes

Someone posted about how they could selectively hide tree nodes, and I already had this AbstractTreeModel class (which does some things DefaultTreeModel does and some it doesn't) and a concrete subclass for TreeNode objects, so I was thinking how one could do hideable nodes. So I came up with this solution.
There's 4 classes here:
- AbstractTreeModel is the base for the concrete TreeNodeTreeModel
- TreeNodeTreeModel extends AbstractTreeModel to support TreeNodes (DefautlMutableTreeNode, etc.)
- HideableMutableTreeNode which is a DefautlMutableTreeNode subclass which has a visible field (with is/set methods, of course).
- HideableTreeModel is the hideable model which is a subclass of TreeNodeTreeModel.
A HideableMutableTreeNode can be set invisible directly, but the tree still needs to be notified to update. So it's best to use the methods in HideableTreeModel which set a node's visibility which notify the tree of changes accordingly. Methods are also provided to check a full path's visibility or ensure a node including all parent nodes are visible.
A HideableTreeModel can take any TreeNode class, it doesn't have to be all HideableMutableTreeNodes, but only HideableMutableTreeNodes can be made invisible, of course. Any other TreeNode type would just be considered visible.
Hiding nodes works basically by making the tree think there's less nodes then there are. And to do this, the node counts and child index search just works by looping thru the parent's children. This has potential perfomance drawbacks of course, since one has to loop thru the node's children to get nodes every time. This could be alleviated by not supporting non-hideable nodes changing the internal maintenance of HideableMutableTreeNode contents. But I'll leave that to whoever really needs it. It shouldn't be a problem if there are are a relatively small set of child nodes in any given parent.
Also, note that the root node in the model cannot be made invisible, cuz it'd be redundant since JTree can be set to hide the root node.
// *** HideableTreeModel ***
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
* <code>HideableTreeModel</code> is an <code>TreeNodeTreeModel</code>
* implementation for <code>HideableMutableTreeNode</code> objects. The
* model can also take any other <code>javax.swing.tree.TreeNode</code>
* objects.
public class HideableTreeModel extends TreeNodeTreeModel {
 * Creates a new <code>HideableTreeModel</code> object.
 * @param root the root node
 public HideableTreeModel(TreeNode root) {
 super(root);
 * Checks if the specified node is visible. A node can only be
 * hidden if the node is an instance of <code>HideableMutableTreeNode</code>. 
 * 
 * Note that this only test the visibility of the specified node, not
 * whether a parent node is visible. Use <code>isPathToNodeVisible(Object)</code>
 * to check if the full path is visible.
 * @param node the node
 * @param true if the node is visible, else false
 public boolean isNodeVisible(Object node) {
 if(node != getRoot()) {
 if(node instanceof HideableMutableTreeNode) {
 return ((HideableMutableTreeNode)node).isVisible();
 return true;
 * Sets the specified node to be hidden. A node can only be made hidden
 * if the node is an instance of <code>HideableMutableTreeNode</code>. 
 * 
 * Note that this method will notify the tree to reflect any changes to
 * node visibility. 
 * 
 * Note that this will not alter the visibility of any nodes in the
 * specified node's path to the root node. Use
 * <code>ensurePathToNodeVisible(Object)</code> instead to make sure the
 * full path down to that node is visible. 
 * 
 * Note that this method will notify the tree to reflect any changes to
 * node visibility.
 * @param node the node
 * @param v true for visible, false for hidden
 * @param true if the node's visibility could actually change, else false
 public boolean setNodeVisible(Object node, boolean v) {
 // can't hide root
 if(node != getRoot()) {
 if(node instanceof HideableMutableTreeNode) {
 HideableMutableTreeNode n = (HideableMutableTreeNode)node;
 // don't fix what ain't broke...
 if(v != n.isVisible()) {
 TreeNode parent = n.getParent();
 if(v) {
 // need to get index after showing...
 n.setVisible(v);
 int index = getIndexOfChild(parent, n);
 super.nodeInserted(parent, n, index);
 } else {
 // need to get index before hiding...
 int index = getIndexOfChild(parent, n);
 n.setVisible(v);
 super.nodeRemoved(parent, n, index);
 return true;
 return false;
 * Checks if the specified node is visible and all nodes above it are
 * visible.
 * @param node the node
 * @param true if the path is visible, else false
 public boolean isPathToNodeVisible(Object node) {
 Object[] path = getPathToRoot(node);
 for(int i = 0; i < path.length; i++) {
 if(!isNodeVisible(path)) {
 return false;
 return true;
 * Sets the specified node and all nodes above it to be visible.
 * Note that this method will notify the tree to reflect any changes to
 * node visibility.
 * @param node the node
 public void ensurePathToNodeVisible(Object node) {
 Object[] path = getPathToRoot(node);
 for(int i = 0; i < path.length; i++) {
 setNodeVisible(path[i], true);
 * Returns the child of parent at index index in the parent's child array.
 * @param parent the parent node
 * @param index the index
 * @return the child or null if no children
 public Object getChild(Object parent, int index) {
 if(parent instanceof TreeNode) {
 TreeNode p = (TreeNode)parent;
 for(int i = 0, j = -1; i < p.getChildCount(); i++) {
 TreeNode pc = (TreeNode)p.getChildAt(i);
 if(isNodeVisible(pc)) {
 j++;
 if(j == index) {
 return pc;
 return null;
 * Returns the number of children of parent.
 * @param parent the parent node
 * @return the child count
 public int getChildCount(Object parent) {
 int count = 0;
 if(parent instanceof TreeNode) {
 TreeNode p = (TreeNode)parent;
 for(int i = 0; i < p.getChildCount(); i++) {
 TreeNode pc = (TreeNode)p.getChildAt(i);
 if(isNodeVisible(pc)) {
 count++;
 return count;
 * Returns the index of child in parent.
 * @param parent the parent node
 * @param child the child node
 * @return the index of the child node in the parent
 public int getIndexOfChild(Object parent, Object child) {
 int index = -1;
 if(parent instanceof TreeNode && child instanceof TreeNode) {
 TreeNode p = (TreeNode)parent;
 TreeNode c = (TreeNode)child;
 if(isNodeVisible(c)) {
 index = 0;
 for(int i = 0; i < p.getChildCount(); i++) {
 TreeNode pc = (TreeNode)p.getChildAt(i);
 if(pc.equals(c)) {
 return index;
 if(isNodeVisible(pc)) {
 index++;
 return index;
 * Main method for testing.
 * @param args the command-line arguments
 public static void main(String[] args) {
 JFrame f = new JFrame();
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 HideableMutableTreeNode root = new HideableMutableTreeNode("root");
 root.add(new HideableMutableTreeNode("child_1"));
 final HideableMutableTreeNode c2 = new HideableMutableTreeNode("child_2");
 c2.setVisible(false);
 final HideableMutableTreeNode c2a = new HideableMutableTreeNode("child_2_A");
 c2.add(c2a);
 c2.add(new HideableMutableTreeNode("child_2_B"));
 root.add(c2);
 HideableMutableTreeNode c3 = new HideableMutableTreeNode("child_3");
 HideableMutableTreeNode cC = new HideableMutableTreeNode("child_3_C");
 cC.setVisible(false);
 c3.add(cC);
 c3.add(new HideableMutableTreeNode("child_3_D"));
 root.add(c3);
 root.add(new HideableMutableTreeNode("child_4"));
 root.add(new HideableMutableTreeNode("child_5"));
 DefaultMutableTreeNode c6 = new DefaultMutableTreeNode("child_6");
 c6.add(new DefaultMutableTreeNode("child_6_A"));
 c6.add(new DefaultMutableTreeNode("child_6_B"));
 root.add(c6);
 final HideableTreeModel model = new HideableTreeModel(root);
 JTree tree = new JTree(model);
 f.getContentPane().add(new JScrollPane(tree), BorderLayout.CENTER);
 JButton b = new JButton("toggle");
 b.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 model.setNodeVisible(c2, !model.isNodeVisible(c2));
 //model.ensurePathToNodeVisible(c2a);
 f.getContentPane().add(b, BorderLayout.SOUTH);
 f.pack();
 f.setSize(300, 500);
 f.show();
// *** HideableMutableTreeNode ***
import javax.swing.*;
import javax.swing.tree.*;
* <code>HideableMutableTreeNode</code> is a <code>DefaultMutableTreeNode</code>
* implementation that works with <code>HideableTreeModel</code>.
public class HideableMutableTreeNode extends DefaultMutableTreeNode {
 * The node is visible flag.
 public boolean visible = true;
 * Creates a tree node that has no parent and no children, but which
 * allows children.
 public HideableMutableTreeNode() {
 super();
 * Creates a tree node with no parent, no children, but which allows
 * children, and initializes it with the specified user object.
 * @param userObject - an Object provided by the user that
 * constitutes the node's data
 public HideableMutableTreeNode(Object userObject) {
 super(userObject);
 * Creates a tree node with no parent, no children, initialized with the
 * specified user object, and that allows children only if specified.
 * @param userObject - an Object provided by the user that
 * constitutes the node's data
 * @param allowsChildren - if true, the node is allowed to have child
 * nodes -- otherwise, it is always a leaf node
 public HideableMutableTreeNode(Object userObject, boolean allowsChildren) {
 super(userObject, allowsChildren);
 * Checks if the node is visible.
 * @return true if the node is visible, else false
 public boolean isVisible() {
 return this.visible;
 * Sets if the node is visible.
 * @param v true if the node is visible, else false
 public void setVisible(boolean v) {
 this.visible = v;
// *** TreeNodeTreeModel ***
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
* <code>TreeNodeTreeModel</code> is an <code>AbstractTreeModel</code>
* implementation for <code>javax.swing.tree.TreeNode</code> objects.
public class TreeNodeTreeModel extends AbstractTreeModel {
 * Creates a new <code>TreeNodeTreeModel</code> object.
 * @param root the root node
 public TreeNodeTreeModel(TreeNode root) {
 super();
 setRoot(root);
 * Returns the parent of the child node.
 * @param node the child node
 * @return the parent or null if root
 public Object getParent(Object node) {
 if(node != getRoot() && (node instanceof TreeNode)) {
 return ((TreeNode)node).getParent();
 return null;
 * Returns the child of parent at index index in the parent's child array.
 * @param parent the parent node
 * @param index the index
 * @return the child or null if no children
 public Object getChild(Object parent, int index) {
 if(parent instanceof TreeNode) {
 return ((TreeNode)parent).getChildAt(index);
 return null;
 * Returns the number of children of parent.
 * @param parent the parent node
 * @return the child count
 public int getChildCount(Object parent) {
 if(parent instanceof TreeNode) {
 return ((TreeNode)parent).getChildCount();
 return 0;
 * Returns the index of child in parent.
 * @param parent the parent node
 * @param child the child node
 * @return the index of the child node in the parent
 public int getIndexOfChild(Object parent, Object child) {
 if(parent instanceof TreeNode && child instanceof TreeNode) {
 return ((TreeNode)parent).getIndex((TreeNode)child);
 return -1;
 * Returns true if node is a leaf.
 * @param node the node
 * @return true if the node is a leaf
 public boolean isLeaf(Object node) {
 if(node instanceof TreeNode) {
 return ((TreeNode)node).isLeaf();
 return true;
 * Main method for testing.
 * @param args the command-line arguments
 public static void main(String[] args) {
 JFrame f = new JFrame();
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
 root.add(new DefaultMutableTreeNode("child_1"));
 DefaultMutableTreeNode c2 = new DefaultMutableTreeNode("child_2");
 c2.add(new DefaultMutableTreeNode("child_2_A"));
 c2.add(new DefaultMutableTreeNode("child_2_B"));
 root.add(c2);
 root.add(new DefaultMutableTreeNode("child_3"));
 root.add(new DefaultMutableTreeNode("child_4"));
 JTree tree = new JTree(new TreeNodeTreeModel(root));
 f.getContentPane().add(new JScrollPane(tree));
 f.pack();
 f.setSize(300, 500);
 f.show();
// *** AbstractTreeModel ***
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public abstract class AbstractTreeModel implements TreeModel {
 * The list of tree model listeners.
 private Vector modelListeners = new Vector();
 * The root object of the tree.
 private Object root = null;
 * Basic no-op constructor.
 public AbstractTreeModel() {
 * Gets the root object of the tree.
 * @return the root object
 public Object getRoot() {
 return this.root;
 * Sets the root object of the tree.
 * @param r the root object
 protected void setRoot(Object r) {
 this.root = r;
 * Gets the path to the root node for the specified object.
 * @param node the root node
 * @return the path to the object or <CODE>null</CODE>
 public Object[] getPathToRoot(Object node) {
 return getPathToRoot(node, 0);
 * Gets the path to the root node for the specified object.
 * @param node the root node
 * @param i the current index
 * @return the path to the object or <CODE>null</CODE>
 private Object[] getPathToRoot(Object node, int i) {
 Object anode[];
 if(node == null) {
 if(i == 0) {
 return null;
 anode = new Object[i];
 } else {
 i++;
 if(node == getRoot()) {
 anode = new Object[i];
 } else {
 anode = getPathToRoot(getParent(node), i);
 anode[anode.length - i] = node;
 return anode;
 * Gets the parent object of the specified object. This method is not
 * part of the <code>javax.swing.tree.TreeModel</code> interface, but is
 * required to support the <code>getPathToRoot(Object)</code> method,
 * which is widely used in this class. Therefore, it is important to
 * correctly implement this method.
 * @param obj the object
 * @parma the parent object or null if no parent or invalid object
 protected abstract Object getParent(Object obj);
 * Adds a listener for the <CODE>TreeModelEvent</CODE> posted after the
 * tree changes.
 * @param l the tree model listener
 public void addTreeModelListener(TreeModelListener l) {
 modelListeners.addElement(l);
 * Removes a listener previously added with addTreeModelListener().
 * @param l the tree model listener
 public void removeTreeModelListener(TreeModelListener l) {
 modelListeners.removeElement(l);
 * Forces the tree to reload. This is useful when many changes occur
 * under the root node in the tree structure.
 * NOTE: This will cause the tree to be collapsed. To maintain
 * the expanded nodes, see the <code>getExpandedPaths(JTree)</code>
 * and <code>expandPaths(JTree, ArrayList)</code> methods.
 * @see #getExpandedPaths(JTree)
 * @see #expandPaths(JTree, ArrayList)
 public void reload() {
 reload(getRoot());
 * Forces the tree to repaint. This is useful when many changes occur
 * under a specific node in the tree structure.
 * NOTE: This will cause the tree to be collapsed below the
 * updated node.
 * @param node the node that changed
 public void reload(Object node) {
 if(node != null) {
 TreePath tp = new TreePath(getPathToRoot(node));
 fireTreeStructureChanged(new TreeModelEvent(this, tp));
 * Messaged when the user has altered the value for the item identified
 * by <CODE>path</CODE> to <CODE>newValue</CODE>.
 * @param path the path to the changed object
 * @param newValue the new value
 public void valueForPathChanged(TreePath path, Object newValue) {
 nodeChanged(path.getLastPathComponent());
 * Notifies the tree that nodes were inserted. The index is looked up
 * automatically.
 * @param node the parent node
 * @param child the inserted child node
 public void nodeInserted(Object node, Object child) {
 nodeInserted(node, child, -1);
 * Notifies the tree that nodes were inserted.
 * @param node the parent node
 * @param child the inserted child node
 * @param index the index of the child
 public void nodeInserted(Object node, Object child, int index) {
 if(index < 0) {
 index = getIndexOfChild(node, child);
 if(node != null && child != null && index >= 0) {
 TreePath tp = new TreePath(getPathToRoot(node));
 int[] ai = { index };
 Object[] ac = { child };
 fireTreeNodesInserted(new TreeModelEvent(this, tp, ai, ac));
 * Notifies the tree that nodes were removed. The index is required
 * since by this point, the object will no longer be in the tree.
 * @param node the parent node
 * @param child the removed child node
 * @param index the index of the child
 public void nodeRemoved(Object node, Object child, int index) {
 if(node != null && child != null && index >= 0) {
 TreePath tp = new TreePath(getPathToRoot(node));
 int[] ai = { index };
 Object[] ac = { child };
 fireTreeNodesRemoved(new TreeModelEvent(this, tp, ai, ac));
 * Notifies the tree that a node was changed.
 * @param node the changed node
 public void nodeChanged(Object node) {
 if(node != null) {
 TreePath tp = new TreePath(getPathToRoot(node));
 fireTreeNodesChanged(new TreeModelEvent(this, tp, null, null));
 * Fires "tree nodes changed" events to all listeners.
 * @param event the tree model event
 protected void fireTreeNodesChanged(TreeModelEvent event) {
 for(int i = 0; i < modelListeners.size(); i++) {
 ((TreeModelListener)modelListeners.elementAt(i)).treeNodesChanged(event);
 * Fires "tree nodes inserted" events to all listeners.
 * @param event the tree model event
 protected void fireTreeNodesInserted(TreeModelEvent event) {
 for(int i = 0; i < modelListeners.size(); i++) {
 ((TreeModelListener)modelListeners.elementAt(i)).treeNodesInserted(event);
 * Fires "tree nodes removed" events to all listeners.
 * @param event the tree model event
 protected void fireTreeNodesRemoved(TreeModelEvent event) {
 for(int i = 0; i < modelListeners.size(); i++) {
 ((TreeModelListener)modelListeners.elementAt(i)).treeNodesRemoved(event);
 * Fires "tree structure changed" events to all listeners.
 * @param event the tree model event
 protected void fireTreeStructureChanged(TreeModelEvent event) {
 for(int i = 0; i < modelListeners.size(); i++) {
 ((TreeModelListener)modelListeners.elementAt(i)).treeStructureChanged(event);
 * Records the list of currently expanded paths in the specified tree.
 * This method is meant to be called before calling the
 * <code>reload()</code> methods to allow the tree to store the paths.
 * @param tree the tree
 * @param pathlist the list of expanded paths
 public ArrayList getExpandedPaths(JTree tree) {
 ArrayList expandedPaths = new ArrayList();
 addExpandedPaths(tree, tree.getPathForRow(0), expandedPaths);
 return expandedPaths;
 * Adds the expanded descendants of the specifed path in the specified
 * tree to the internal expanded list.
 * @param tree the tree
 * @param path the path
 * @param pathlist the list of expanded paths
 private void addExpandedPaths(JTree tree, TreePath path, ArrayList pathlist) {
 Enumeration enum = tree.getExpandedDescendants(path);
 while(enum.hasMoreElements()) {
 TreePath tp = (TreePath)enum.nextElement();
 pathlist.add(tp);
 addExpandedPaths(tree, tp, pathlist);
 * Re-expands the expanded paths in the specified tree. This method is
 * meant to be called before calling the <code>reload()</code> methods
 * to allow the tree to store the paths.
 * @param tree the tree
 * @param pathlist the list of expanded paths
 public void expandPaths(JTree tree, ArrayList pathlist) {
 for(int i = 0; i < pathlist.size(); i++) {
 tree.expandPath((TreePath)pathlist.get(i));

Hey
I'm not trying to show anyone up here, but having just built a tree model for displaying an XML document in a tree, I thought this seemed like a neat exercise.
I implemented this very differently from the @OP. I only have one class, HiddenNodeTreeModel. All the hidden node data is stored in the model itself in my class. The advantage of what I've created is it will work with any TreeModel. The disadvantage is that I think it's not going to be very scalable - the additional computing to get the number of child nodes and to adjust indexes is heavy. So if you need a scalable solution definitely don't use this.
Anyway here you go
HiddenNodeTreeModel.java
======================
package tjacobs.ui.tree;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTree;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import tjacobs.ui.WindowUtilities;
public class HiddenNodeTreeModel implements TreeModel {
 TreeModel mModel;
 ArrayList<Object> mHidden = new ArrayList<Object>();
 public HiddenNodeTreeModel (TreeModel model) {
 mModel = model;
 public void addTreeModelListener(TreeModelListener arg0) {
 mModel.addTreeModelListener(arg0);
 private ArrayList<Integer> getHiddenChildren(Object parent) {
 ArrayList<Integer> spots = new ArrayList<Integer>();
 Iterator _i = mHidden.iterator();
 while (_i.hasNext()) {
 Object hidden = _i.next();
 int idx = mModel.getIndexOfChild(parent, hidden);
 if (idx != -1) {
 spots.add(idx);
 return spots;
 public Object getChild(Object arg0, int index) {
 ArrayList<Integer> spots = getHiddenChildren(arg0);
 Collections.sort(spots);
 Iterator<Integer> _i = spots.iterator();
 while (_i.hasNext()) {
 int num = _i.next();
 if (num <= index) {
 index++;
 return mModel.getChild(arg0, index);
 public int getChildCount(Object arg0) {
 ArrayList list = getHiddenChildren(arg0);
 System.out.println("size = " + list.size());
 return mModel.getChildCount(arg0) - list.size();
 public int getIndexOfChild(Object arg0, Object arg1) {
 int index = mModel.getIndexOfChild(arg0, arg1);
 ArrayList<Integer> spots = getHiddenChildren(arg0);
 Collections.sort(spots);
 Iterator<Integer> _i = spots.iterator();
 int toSub = 0;
 while (_i.hasNext()) {
 int num = _i.next();
 if (num <= index) {
 toSub++;
 return index - toSub;
 public Object getRoot() {
 // TODO Auto-generated method stub
 return mModel.getRoot();
 public boolean isLeaf(Object arg0) {
 // TODO Auto-generated method stub
 return mModel.isLeaf(arg0);
 public void removeTreeModelListener(TreeModelListener arg0) {
 mModel.removeTreeModelListener(arg0);
 public void valueForPathChanged(TreePath arg0, Object arg1) {
 mModel.valueForPathChanged(arg0, arg1);
 public void hideNode(Object node) {
 if (node instanceof TreePath) {
 node = ((TreePath)node).getLastPathComponent();
 mHidden.add(node);
 public void showNode(Object node) {
 mHidden.remove(node);
 public void showAll() {
 mHidden.clear();
 * @param args
 public static void main(String[] args) {
 // TODO Auto-generated method stub
 DefaultMutableTreeNode A = new DefaultMutableTreeNode("A");
 DefaultMutableTreeNode B = new DefaultMutableTreeNode("B");
 DefaultMutableTreeNode C = new DefaultMutableTreeNode("C");
 DefaultMutableTreeNode D = new DefaultMutableTreeNode("D");
 DefaultMutableTreeNode E = new DefaultMutableTreeNode("E");
 DefaultMutableTreeNode F = new DefaultMutableTreeNode("F");
 A.add(B);
 B.add(C);
 B.add(D);
 B.add(E);
 E.add(F);
 DefaultTreeModel model = new DefaultTreeModel(A);
 final HiddenNodeTreeModel hmodel = new HiddenNodeTreeModel(model);
 final JTree tree = new JTree(hmodel);
 JFrame jf = new JFrame("HiddenNodeTreeModel Test");
 jf.add(tree);
 JMenuBar bar = new JMenuBar();
 jf.setJMenuBar(bar);
 JMenu menu = new JMenu("Options");
 bar.add(menu);
 final JMenuItem hide = new JMenuItem("Hide");
 final JMenuItem show = new JMenuItem("ShowAll");
 menu.add(hide);
 menu.add(show);
 ActionListener al = new ActionListener() {
 public void actionPerformed(ActionEvent ae) {
 if (ae.getSource() == hide) {
 hmodel.hideNode(tree.getSelectionPath());
 tree.updateUI();
 else {
 hmodel.showAll();
 tree.updateUI();
 hide.addActionListener(al);
 show.addActionListener(al);
 jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 jf.setBounds(100,100,100,100);
 jf.setVisible(true);
}

Checking if user has selected or deselected a tree node

Hello,
In the event handler of the On Action event of a tree node, I need to decide whether the user has selected the element or deselected it.
I thought to use the following:
data: lo_node type ref to if_wd_context_node,
         lo_element type ref to if_wd_context_element,
         l_element_selected type abap_bool.
first I tried
* need to find out if this element was selected or deselected!
l_element_selected = context_element->is_selected( ).
but it didn't work - so I tried
lo_node = context_element->get_node( ).
lo_element = lo_node->get_lead_selection( ).
if lo_element = context_element.
    l_element_selected = abap_true.
else.
    l_element_selected = abap_false.
endif.
This did work.
I'm slightly confused as to why the two did not give the same result?
I can see in the implementation why - gotta love being able to see how the engine works - but why is the node selection table not set? For future reference, is there some flow that has to happen before the selection gets set but after the lead selection is made? Or is this just an error in the handling of the tree node element?
Cheers,
Chris

One would wonder why there is no is_Lead_Selected method. Having just the is _ Multi_ Selected method is quite confusing. Especially when the method description is "True, if element is selected in the node". One would assume that this would include lead selection.
Then again - when you consider the mismatch between methods that return values and methods that export values, this lack of a is_Lead_Selected method would be low down on my list of things to fix to make WDA more consistent.
Having Get_Static_Attributes return the data rather than export it would be much higher on my list - ( get_static_attributes_ref does actually return the reference to the data - talk about inconsistent! )

Q about tree nodes w. same label (different branches)

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