Elegant XML -- JTree
Problem:
To build an XML editor -> an elegant way to refelct changes in the Jtree to the XML on the file system.
Is there anyother way other than what is done in the tutorial by sun (reating an Adaptor Object inheriting from defaultMutableTreeNode )?
any leads/ links?
...well i eventullay came up with a sulution ..
1) Create Your Object(MyObject) with ref to a node in the XmlTree.
2) add MyObject as Userobject in the DefaultmutableTree of the JTree node.
3) So for every tree selection /Manupulation u have the org ref of the XML node in the tree which u can manupulate too.
works great for me!
Similar Messages
-
XML - JTree in JBuilder environment
Basically, my task is to create an basic java-xml based forum for part of my school project. My code has to be able to compile and run in JBuilder 7 Enterprise (Windows) without installing any extra APIs or XML Parsers [ :( ]. How do I do basic xml manipulations with JTree (i.e. read write) in this limited environment? Also I would love to see some sample codes on how to load xml into JTree. I haven't seen one around. Please advice. Thanks in advanced.
try this:
http://java.sun.com/j2ee/1.4/docs/tutorial/examples/jaxp/dom/samples/DomEcho02.java -
Hi Friends,
I am a beginner in RMI. I am trying to develop a JTree with following functionalities for XML file reading and writing
1) generating TreeNode from String
2) generating String from TreeNode
Both of this functions I want to keep at Server and want to invoke using RMI.
Following is the code:
public interface XTreeIF
extends Remote {
public DefaultMutableTreeNode createTreeNode(String xmlText)
throws RemoteException;
public String createXmlString(DefaultMutableTreeNode rootNode)
throws RemoteException;
public class RemoteXTree
extends UnicastRemoteObject
implements XTreeIF {
public DefaultMutableTreeNode createTreeNode(String text)
throws RemoteException {
DefaultMutableTreeNode treeNode;
treeNode = createTreeNode(parseXml(text)); //function for creating treenode
return _treeNode;
public String createXmlString(DefaultMutableTreeNode treeNode)
throws RemoteException {
StringBuffer xml = new StringBuffer();
xml.append("<?xml version=\"1.0\" ?>");
xml.append(createXmlNodes(treeNode)); //function for creating xml nodes
return xml.toString();
}I am getting error on the client side as:
java.rmi.UnmarshalException: Error unmarshaling return header;
Can anyone please suggest what may be the problem and how to sort it out.Hi Mr.Nitin,
print the stak trace and I can you help.
Bye. -
Generating large amounts of XML without running out of memory
Hi there,
I need some advice from the experienced xdb users around here. I´m trying to map large amounts of data inside the DB (Oracle 11.2.0.1.0) and by large I mean files up to several GB. I compared the "low level" mapping via PL/SQL in combination with ExtractValue/XMLQuery with the elegant XML View Mapping and the best performance gave me the View Mapping by using the XMLTABLE XQuery PATH constructs. So now I have a View that lies on several BINARY XMLTYPE Columns (where the XML files are stored) for the mapping and another view which lies above this Mapping View and constructs the nested XML result document via XMLELEMENT(),XMLAGG() etc. Example Code for better understanding:
CREATE OR REPLACE VIEW MAPPING AS
SELECT type, (...) FROM XMLTYPE_BINARY, XMLTABLE ('/ROOT/ITEM' passing xml
COLUMNS
type VARCHAR2(50) PATH 'for $x in .
let $one := substring($x/b012,1,1)
let $two := substring($x/b012,1,2)
return
if ($one eq "A")
then "A"
else if ($one eq "B" and not($two eq "BJ"))
then "AA"
else if (...)
CREATE OR REPLACE VIEW RESULT AS
select XMLELEMENT("RESULTDOC",
(SELECT XMLAGG(
XMLELEMENT("ITEM",
XMLFOREST(
type "ITEMTYPE",
) as RESULTDOC FROM MAPPING;
----------------------------------------------------------------------------------------------------------------------------Now all I want to do is materialize this document by inserting it into a XMLTYPE table/column.
insert into bla select * from RESULT;
Sounds pretty easy but can´t get it to work, the DB seems to load a full DOM representation into the RAM every time I perform a select, insert into or use the xmlgen tool. This Representation takes more than 1 GB for a 200 MB XML file and eventually I´m running out of memory with an
ORA-19202: Error occurred in XML PROCESSING
ORA-04030: out of process memory
My question is how can I get the result document into the table without memory exhaustion. I thought the db would be smart enough to generate some kind of serialization/datastream to perform this task without loading everything into the RAM.
Best regardsThe file import is performed via jdbc, clob and binary storage is possible up to several GB, the OR storage gives me the ORA-22813 when loading files with more than 100 MB. I use a plain prepared statement:
File f = new File( path );
PreparedStatement pstmt = CON.prepareStatement( "insert into " + table + " values ('" + id + "', XMLTYPE(?) )" );
pstmt.setClob( 1, new FileReader(f) , (int)f.length() );
pstmt.executeUpdate();
pstmt.close(); DB version is 11.2.0.1.0 as mentioned in the initial post.
But this isn´t my main problem, the above one is, I prefer using binary xmltype anyway, much easier to index. Anyone an idea how to get the large document from the view into a xmltype table? -
Problem with Jtree to xml tranform..how to set/get parent of a node?
Hi,
I am trying to develop xml import/export module.In import wizard, I am parsing the xml file and the display it in Jtree view using xml tree model which implements TreeModel and xml tree node.I am using jaxp api..
It is workin fine.
I got stuck with removal of selected node and save it as a new xml.
I am not able to get parent node of selected node in remove process,itz throwing null.I think i missed to define parent when i load treemodel.Plz help me out..give some ideas to do it..
thanks
-bala
Edited by: r_bala on May 9, 2008 4:44 AMthere's no way anyone can help you without seeing your code.
-
Is it possible to reprent XML in a JTree format?
Hi
I have an XML file.I want to retrieve all the nodes in my XML file and put it in a JTree..Is it possible to do??If so how we can go about this???
thanks for your reply in advanceSince XML is naturally a tree then all you need to do is write a tree model that maps onto a DOM model. I do this using JDOM.
It does not take much code to just create a viewer but it takes quite a lot of code if you want to edit the tree. I am working on this edit feature at the moment.
I use a renderer that uses a mapping file (also in XML) in order to define how a node should be rendered. This feature is significantly more complex than simple rendering but is very efective and it means I separate the model from the view. -
Hi ,
Can anyone help me in converting a JTree to XML file.
The Jtree is build from an xml file, the user can add, delete nodes in JTree and save to the xml file. Is there any way I can update the same xml file.
Suggestions are greatly appreciated.
Thanks,
SS..Hi ,
Can anyone help me in converting a JTree to XML file.
The Jtree is build from an xml file, the user can add, delete nodes in JTree and save to the xml file. Is there any way I can update the same xml file.
Suggestions are greatly appreciated.
Thanks,
SS.. -
Xml in JTree: how to not collpase JTree node, when renaming XML Node.
Hi.
I'm writing some kind of XML editor. I want to view my XML document in JTree and make user able to edit contents of XML. I made my own TreeModel for JTree, which straight accesses XML DOM, produced by Xerces. Using DOM Events, I made good-looking JTree updates without collapsing JTree on inserting or removing XML nodes.
But there is a problem. I need to produce to user some method of renaming nodes. As I know, there is no way to rename node in w3c DOM. So I create new one with new name and copy all children and attributes to it. But in this way I got a new object of XML Node instead of renamed one. And I need to initiate rebuilding (treeStructureChanged event) of JTree structure. Renamed node collapses. If I use treeNodesChanged event (no rebuilding, just changes string view of JTree node), then when I try to operate with renamed node again, exception will be throwed.
Is there some way to rename nodes in my program without collpasing JTree?
I'am new to Java. Maybe there is a method in Xerces DOM implementation to rename nodes without recreating?
Thanks in advance.I assume that "rename" means to change the element name? Anyway your question seems to be "When I add a node to a JTree, how do I make sure it is expanded?" This is completely concerned with Swing, so it might have been better to post it in the Swing forum, but if it were me I would do this:
1. Copy the XML document into a JTree.
2. Allow the user to edit the document. Don't attempt to keep an XML document or DOM synchronized with the contents of the JTree.
3. On request of the user, copy the JTree back to a new XML document.
This way you can "rename" things to the user's heart's content without having the problem you described. -
JTree with XML content expand/collapse problem
Hello all,
I'm having this very weird problem with a JTree I use to display the contents of an XML file. I use the DOM parser (and not JDOM since I want the application to run as an applet as well, and don't want to have any external libraries for the user to download) and have a custom TreeModel and TreeNode implementations to wrap the DOM nodes so that they are displayed by the JTree.
I have also added a popup menu in the tree, for the user to be able to expand/collapse all nodes under the selected one (i.e. a recursive method).
When expandAll is run, everything works fine and the children of the selected node are expanded (and their children and so on).
However, after the expansion when I run the collapseAll function, even though the selected node collapses, when I re-expand it (manually not by expandAll) all of it's children are still fully open! Even if I collapse sub-elements of the node manually and then collapse this node and re-expand it, it "forgets" the state of it's children and shows them fully expanded.
In other words once I use expandAll no matter what I do, the children of this node will be expanded (once I close it and re-open it).
Also after running expandAll the behaviour(!) of the expanded nodes change: i have tree.setToggleClickCount(1); but on the expanded nodes I need to double-click to collapse them.
I believe the problem is related to my implementations of TreeModel and TreeNode but after many-many hours of trying to figure out what's happening I'm desperate... Please help!
Here's my code:
public class XMLTreeNode implements TreeNode
//This class wraps a DOM node
org.w3c.dom.Node domNode;
protected boolean allowChildren;
protected Vector children;
//compressed view (#text).
private static boolean compress = true;
// An array of names for DOM node-types
// (Array indexes = nodeType() values.)
static final String[] typeName = {
"none",
"Element",
"Attr",
"Text",
"CDATA",
"EntityRef",
"Entity",
"ProcInstr",
"Comment",
"Document",
"DocType",
"DocFragment",
"Notation",
static final int ELEMENT_TYPE = 1;
static final int ATTR_TYPE = 2;
static final int TEXT_TYPE = 3;
static final int CDATA_TYPE = 4;
static final int ENTITYREF_TYPE = 5;
static final int ENTITY_TYPE = 6;
static final int PROCINSTR_TYPE = 7;
static final int COMMENT_TYPE = 8;
static final int DOCUMENT_TYPE = 9;
static final int DOCTYPE_TYPE = 10;
static final int DOCFRAG_TYPE = 11;
static final int NOTATION_TYPE = 12;
// The list of elements to display in the tree
static String[] treeElementNames = {
"node",
// Construct an Adapter node from a DOM node
public XMLTreeNode(org.w3c.dom.Node node) {
domNode = node;
public String toString(){
if (domNode.hasAttributes()){
return domNode.getAttributes().getNamedItem("label").getNodeValue();
}else return domNode.getNodeName();
public boolean isLeaf(){
return (this.getChildCount()==0);
boolean treeElement(String elementName) {
for (int i=0; i<treeElementNames.length; i++) {
if ( elementName.equals(treeElementNames)) return true;
return false;
public int getChildCount() {
if (!compress) {
return domNode.getChildNodes().getLength();
int count = 0;
for (int i=0; i<domNode.getChildNodes().getLength(); i++) {
org.w3c.dom.Node node = domNode.getChildNodes().item(i);
if (node.getNodeType() == ELEMENT_TYPE
&& treeElement( node.getNodeName() ))
// Note:
// Have to check for proper type.
// The DOCTYPE element also has the right name
++count;
return count;
public boolean getAllowsChildren() {
// TODO Auto-generated method stub
return true;
public Enumeration children() {
// TODO Auto-generated method stub
return null;
public TreeNode getParent() {
// TODO Auto-generated method stub
return null;
public TreeNode getChildAt(int searchIndex) {
org.w3c.dom.Node node =
domNode.getChildNodes().item(searchIndex);
if (compress) {
// Return Nth displayable node
int elementNodeIndex = 0;
for (int i=0; i<domNode.getChildNodes().getLength(); i++) {
node = domNode.getChildNodes().item(i);
if (node.getNodeType() == ELEMENT_TYPE
&& treeElement( node.getNodeName() )
&& elementNodeIndex++ == searchIndex) {
break;
return new XMLTreeNode(node);
public int getIndex(TreeNode tnode) {
if (tnode== null) {
throw new IllegalArgumentException("argument is null");
XMLTreeNode child=(XMLTreeNode)tnode;
int count = getChildCount();
for (int i=0; i<count; i++) {
XMLTreeNode n = (XMLTreeNode)this.getChildAt(i);
if (child.domNode == n.domNode) return i;
return -1; // Should never get here.
public class XMLTreeModel2 extends DefaultTreeModel
private Vector listenerList = new Vector();
* This adapter converts the current Document (a DOM) into
* a JTree model.
private Document document;
public XMLTreeModel2 (Document doc){
super(new XMLTreeNode(doc));
this.document=doc;
public Object getRoot() {
//System.err.println("Returning root: " +document);
return new XMLTreeNode(document);
public boolean isLeaf(Object aNode) {
return ((XMLTreeNode)aNode).isLeaf();
public int getChildCount(Object parent) {
XMLTreeNode node = (XMLTreeNode) parent;
return node.getChildCount();
public Object getChild(Object parent, int index) {
XMLTreeNode node = (XMLTreeNode) parent;
return node.getChildAt(index);
public int getIndexOfChild(Object parent, Object child) {
if (parent==null || child==null )
return -1;
XMLTreeNode node = (XMLTreeNode) parent;
return node.getIndex((XMLTreeNode) child);
public void valueForPathChanged(TreePath path, Object newValue) {
// Null. no changes
public void addTreeModelListener(TreeModelListener listener) {
if ( listener != null
&& ! listenerList.contains( listener ) ) {
listenerList.addElement( listener );
public void removeTreeModelListener(TreeModelListener listener) {
if ( listener != null ) {
listenerList.removeElement( listener );
public void fireTreeNodesChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesChanged( e );
public void fireTreeNodesInserted( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesInserted( e );
public void fireTreeNodesRemoved( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesRemoved( e );
public void fireTreeStructureChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeStructureChanged( e );
The collapseAll, expandAll code (even though I m pretty sure that's not the problem since they work fine on a normal JTree):
private void collapseAll(TreePath tp){
if (tp==null) return;
Object node=tp.getLastPathComponent();
TreeModel model=tree.getModel();
if (!model.isLeaf(node)){
tree.collapsePath(tp);
for (int i=0;i<model.getChildCount(node);i++){
//for (int i = node.childCount()-4;i>=0;i--){
collapseAll(tp.pathByAddingChild(model.getChild(node,i)));
tree.collapsePath(tp);
private void expandAll(TreePath tp){
if (tp==null) return;
Object node=tp.getLastPathComponent();
TreeModel model=tree.getModel();
if (!model.isLeaf(node)){
tree.expandPath(tp);
for (int i=0;i<model.getChildCount(node);i++){
//for (int i = node.childCount()-4;i>=0;i--){
expandAll(tp.pathByAddingChild(model.getChild(node,i)));Hi,
Iam not facing this problem. To CollapseAll, I do a tree.getModel().reload() which causes all nodes to get collapsed and remain so even if I reopen them manually.
Hope this helps.
cheers,
vidyut -
Hi Friends,
I am trying to create a JTree whose data will come from a XML Document. Whenever the tree is refreshed (There is a JPopupMenu on the tree which allows the user to call refresh), the tree must update itself with the underlying XML document. If there is any change in the xml doc, it must be reflected in the tree. However, the tree must not collapse when the refresh is called. For example if I have a tree like this:-
+ Root
|
------ Child #1
| |
| -------- A
| |
| -------- B
|
+------ Child #2
|
------- Child #3
|
-------- AAA
|
-------- BBBThe XML Document for the above tree structure would be:-
<?xml version="1.0" encoding="UTF-8"?>
<Root>Root
<Child> Child #1
<SubChild>A</SubChild>
<SubChild>B</SubChild>
</Child>
<Child> Child #2
<SubChild>AA</SubChild>
<SubChild>BB</SubChild>
</Child>
<Child> Child #3
<SubChild>AAA</SubChild>
<SubChild>BBB</SubChild>
</Child>
</Root>Now if i add another node (CCC) in Child #3 (by adding another Subchild element in the XML document), and click refresh on the tree, the tree should look like:-
+ Root
|
------ Child #1
| |
| -------- A
| |
| -------- B
|
+------ Child #2
|
------- Child #3
|
-------- AAA
|
-------- BBB
|
-------- CCCHowever, if i am trying to reload the tree model, after reading the XML file, the whole tree collapses.
Can anyone please help me out with this problem?
Thanx a lot in advance,
~Debopam* XMLNode.java
* Created on December 18, 2004, 4:25 PM
package debopam.utils.xml;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.util.Vector;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreeNode;
import org.jdom.Element;
* @author Debopam Ghoshal
public class XMLNode implements MutableTreeNode
private Element nodeElement;
private XMLNode parent;
/** optional user object */
transient protected Object userObject;
/** true if the node is able to have children */
protected boolean allowsChildren;
/** array of children, may be null if this node has no children */
protected Vector children;
* An enumeration that is always empty. This is used when an enumeration
* of a leaf node's children is requested.
static public final Enumeration<TreeNode> EMPTY_ENUMERATION
= new Enumeration<TreeNode>()
public boolean hasMoreElements()
{ return false; }
public TreeNode nextElement()
throw new NoSuchElementException("No more elements");
/** Creates a new instance of XMLNode */
public XMLNode(Element nodeElement, boolean allowsChildren)
this.nodeElement = nodeElement;
this.allowsChildren = allowsChildren;
public XMLNode(String nodeName, boolean allowsChildren)
nodeElement = new Element(nodeName);
this.allowsChildren = allowsChildren;
* Creates and returns a forward-order enumeration of this node's
* children. Modifying this node's child array invalidates any child
* enumerations created before the modification.
* @return an Enumeration of this node's children
public java.util.Enumeration children()
if(children == null)
return EMPTY_ENUMERATION;
else
return children.elements();
* Returns true if this node is allowed to have children.
* @return true if this node allows children, else false
public boolean getAllowsChildren()
return allowsChildren;
* Determines whether or not this node is allowed to have children.
* If <code>allows</code> is false, all of this node's children are
* removed.
* <p>
* Note: By default, a node allows children.
* @param allows true if this node is allowed to have children
public void setAllowsChildren(boolean allows)
if (allows != allowsChildren)
allowsChildren = allows;
if (!allowsChildren)
removeAllChildren();
* Returns the child at the specified index in this node's child array.
* @param index an index into this node's child array
* @exception ArrayIndexOutOfBoundsException if <code>index</code>
* is out of bounds
* @return the TreeNode in this node's child array at the specified index
public javax.swing.tree.TreeNode getChildAt(int index)
if (children == null)
throw new ArrayIndexOutOfBoundsException("node has no children");
return (TreeNode)children.elementAt(index);
* Returns the number of children of this node.
* @return an int giving the number of children of this node
public int getChildCount()
if (children == null)
return 0;
else
return children.size();
* Returns the index of the specified child in this node's child array.
* If the specified node is not a child of this node, returns
* <code>-1</code>. This method performs a linear search and is O(n)
* where n is the number of children.
* @param aChild the TreeNode to search for among this node's children
* @exception IllegalArgumentException if <code>aChild</code>
* is null
* @return an int giving the index of the node in this node's child
* array, or <code>-1</code> if the specified node is a not
* a child of this node
public int getIndex(TreeNode aChild)
if (aChild == null)
throw new IllegalArgumentException("argument is null");
if (!isNodeChild(aChild))
return -1;
return children.indexOf(aChild); // linear search
* Returns this node's parent or null if this node has no parent.
* @return this node's parent TreeNode, or null if this node has no parent
public TreeNode getParent()
return parent;
* Removes <code>newChild</code> from its present parent (if it has a
* parent), sets the child's parent to this node, and then adds the child
* to this node's child array at index <code>childIndex</code>.
* <code>newChild</code> must not be null and must not be an ancestor of
* this node.
* @param newChild the MutableTreeNode to insert under this node
* @param childIndex the index in this node's child array
* where this node is to be inserted
* @exception ArrayIndexOutOfBoundsException if
* <code>childIndex</code> is out of bounds
* @exception IllegalArgumentException if
* <code>newChild</code> is null or is an
* ancestor of this node
* @exception IllegalStateException if this node does not allow
* children
* @see #isNodeDescendant
public void insert(MutableTreeNode newChild, int childIndex)
if (!allowsChildren)
throw new IllegalStateException("node does not allow children");
else if (newChild == null)
throw new IllegalArgumentException("new child is null");
else if (isNodeAncestor(newChild))
throw new IllegalArgumentException("new child is an ancestor");
MutableTreeNode oldParent = (MutableTreeNode)newChild.getParent();
if (oldParent != null)
oldParent.remove(newChild);
newChild.setParent(this);
if (children == null)
children = new Vector();
children.insertElementAt(newChild, childIndex);
public boolean isLeaf()
return !nodeElement.hasChildren();
* Removes the child at the specified index from this node's children
* and sets that node's parent to null. The child node to remove
* must be a <code>MutableTreeNode</code>.
* @param childIndex the index in this node's child array
* of the child to remove
* @exception ArrayIndexOutOfBoundsException if
* <code>childIndex</code> is out of bounds
public void remove(int childIndex)
MutableTreeNode child = (MutableTreeNode)getChildAt(childIndex);
children.removeElementAt(childIndex);
child.setParent(null);
* Removes <code>aChild</code> from this node's child array, giving it a
* null parent.
* @param aChild a child of this node to remove
* @exception IllegalArgumentException if <code>aChild</code>
* is null or is not a child of this node
public void remove(MutableTreeNode aChild)
if (aChild == null)
throw new IllegalArgumentException("argument is null");
if (!isNodeChild(aChild))
throw new IllegalArgumentException("argument is not a child");
remove(getIndex(aChild)); // linear search
* Removes the subtree rooted at this node from the tree, giving this
* node a null parent. Does nothing if this node is the root of its
* tree.
public void removeFromParent()
MutableTreeNode parent = (MutableTreeNode)getParent();
if (parent != null)
parent.remove(this);
* Sets this node's parent to <code>newParent</code> but does not
* change the parent's child array. This method is called from
* <code>insert()</code> and <code>remove()</code> to
* reassign a child's parent, it should not be messaged from anywhere
* else.
* @param newParent this node's new parent
public void setParent(MutableTreeNode mutableTreeNode)
this.parent = parent;
public void setUserObject(Object obj)
this.userObject = obj;
public Element getXMLElement()
return this.nodeElement;
public String toString()
return this.nodeElement.getTextTrim();
* Returns true if <code>anotherNode</code> is an ancestor of this node
* -- if it is this node, this node's parent, or an ancestor of this
* node's parent. (Note that a node is considered an ancestor of itself.)
* If <code>anotherNode</code> is null, this method returns false. This
* operation is at worst O(h) where h is the distance from the root to
* this node.
* @see #isNodeDescendant
* @see #getSharedAncestor
* @param anotherNode node to test as an ancestor of this node
* @return true if this node is a descendant of <code>anotherNode</code>
public boolean isNodeAncestor(TreeNode anotherNode)
if (anotherNode == null)
return false;
TreeNode ancestor = this;
do
if (ancestor == anotherNode)
return true;
} while((ancestor = ancestor.getParent()) != null);
return false;
* Returns true if <code>aNode</code> is a child of this node. If
* <code>aNode</code> is null, this method returns false.
* @return true if <code>aNode</code> is a child of this node; false if
* <code>aNode</code> is null
public boolean isNodeChild(TreeNode aNode)
boolean retval;
if (aNode == null)
retval = false;
else
if (getChildCount() == 0)
retval = false;
else
retval = (aNode.getParent() == this);
return retval;
* Removes all of this node's children, setting their parents to null.
* If this node has no children, this method does nothing.
public void removeAllChildren()
for (int i = getChildCount()-1; i >= 0; i--)
remove(i);
* Removes <code>newChild</code> from its parent and makes it a child of
* this node by adding it to the end of this node's child array.
* @see #insert
* @param newChild node to add as a child of this node
* @exception IllegalArgumentException if <code>newChild</code>
* is null
* @exception IllegalStateException if this node does not allow
* children
public void add(MutableTreeNode newChild)
if(newChild != null && newChild.getParent() == this)
insert(newChild, getChildCount() - 1);
else
insert(newChild, getChildCount());
* Indicates whether some other object is "equal to" this one.
* @param obj the reference object with which to compare.
* @return <code>true</code> if this object is the same as the obj
* argument; <code>false</code> otherwise.
public boolean equals(XMLNode node)
boolean retValue;
retValue = (this.getXMLElement().getTextTrim().equals(node.getXMLElement().getTextTrim())) &&
(this.getXMLElement().getParent().getTextTrim().equals(node.getXMLElement().getParent().getTextTrim()));
return retValue;
* XMLTreeModel.java
* Created on December 20, 2004, 11:29 AM
package debopam.utils.xml;
import java.io.File;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.EventListener;
import java.util.List;
import java.util.Vector;
import javax.swing.event.EventListenerList;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
* @author Debopam Ghoshal
public class XMLTreeModel implements TreeModel
private XMLNode rootNode;
private String xmlFileName;
private Document xmlDocument;
/** Listeners. */
protected EventListenerList listenerList = new EventListenerList();
* Determines how the <code>isLeaf</code> method figures
* out if a node is a leaf node. If true, a node is a leaf
* node if it does not allow children. (If it allows
* children, it is not a leaf node, even if no children
* are present.) That lets you distinguish between <i>folder</i>
* nodes and <i>file</i> nodes in a file system, for example.
* <p>
* If this value is false, then any node which has no
* children is a leaf node, and any node may acquire
* children.
* @see TreeNode#getAllowsChildren
* @see TreeModel#isLeaf
* @see #setAsksAllowsChildren
protected boolean asksAllowsChildren;
/** Creates a new instance of XMLTreeModel */
public XMLTreeModel(String xmlFileName, boolean asksAllowsChildren)
this.xmlFileName = xmlFileName;
this.asksAllowsChildren = asksAllowsChildren;
loadXMLDocument();
rootNode = makeRootNode();
public XMLTreeModel(String xmlFileName)
this(xmlFileName, false);
private void loadXMLDocument()
System.out.println("loading xml document...");
try
this.xmlDocument = null;
this.xmlDocument = new SAXBuilder().build(new File(xmlFileName));
catch(Exception x)
System.out.println("Error while loading XML Document.");
x.printStackTrace();
private XMLNode makeRootNode()
XMLNode root = new XMLNode(xmlDocument.getRootElement(), true);
addChildren(root, xmlDocument.getRootElement());
return root;
private void addChildren(XMLNode parentXMLNode, Element element)
List children = element.getChildren();
for(int i = 0; i < children.size(); i++)
Element childElement = (Element)children.get(i);
XMLNode childNode = new XMLNode(childElement, true);
parentXMLNode.add(childNode);
addChildren(childNode, childElement);
* Sets whether or not to test leafness by asking getAllowsChildren()
* or isLeaf() to the TreeNodes. If newvalue is true, getAllowsChildren()
* is messaged, otherwise isLeaf() is messaged.
public void setAsksAllowsChildren(boolean newValue)
asksAllowsChildren = newValue;
* Tells how leaf nodes are determined.
* @return true if only nodes which do not allow children are
* leaf nodes, false if nodes which have no children
* (even if allowed) are leaf nodes
* @see #asksAllowsChildren
public boolean asksAllowsChildren()
return asksAllowsChildren;
* Returns the child of <I>parent</I> at index <I>index</I> in the parent's
* child array. <I>parent</I> must be a node previously obtained from
* this data source. This should not return null if <i>index</i>
* is a valid index for <i>parent</i> (that is <i>index</i> >= 0 &&
* <i>index</i> < getChildCount(<i>parent</i>)).
* @param parent a node in the tree, obtained from this data source
* @return the child of <I>parent</I> at index <I>index</I>
public Object getChild(Object parent, int index)
return ((XMLNode)parent).getChildAt(index);
* Returns the number of children of <I>parent</I>. Returns 0 if the node
* is a leaf or if it has no children. <I>parent</I> must be a node
* previously obtained from this data source.
* @param parent a node in the tree, obtained from this data source
* @return the number of children of the node <I>parent</I>
public int getChildCount(Object parent)
return ((XMLNode)parent).getChildCount();
* Returns the index of child in parent.
* If either the parent or child is <code>null</code>, returns -1.
* @param parent a note in the tree, obtained from this data source
* @param child the node we are interested in
* @return the index of the child in the parent, or -1
* if either the parent or the child is <code>null</code>
public int getIndexOfChild(Object parent, Object child)
if(parent == null || child == null)
return -1;
return ((XMLNode)parent).getIndex((XMLNode)child);
* Sets the root to <code>root</code>. A null <code>root</code> implies
* the tree is to display nothing, and is legal.
public void setRoot(XMLNode rootNode)
Object oldRoot = this.rootNode;
this.rootNode = rootNode;
if (rootNode == null && oldRoot != null)
fireTreeStructureChanged(this, null);
else
nodeStructureChanged(rootNode);
* Returns the root of the tree. Returns null only if the tree has
* no nodes.
* @return the root of the tree
public Object getRoot()
return rootNode;
* Returns whether the specified node is a leaf node.
* The way the test is performed depends on the
* <code>askAllowsChildren</code> setting.
* @param node the node to check
* @return true if the node is a leaf node
* @see #asksAllowsChildren
* @see TreeModel#isLeaf
public boolean isLeaf(Object node)
if(asksAllowsChildren)
return !((XMLNode)node).getAllowsChildren();
return ((XMLNode)node).isLeaf();
* This sets the user object of the TreeNode identified by path
* and posts a node changed. If you use custom user objects in
* the TreeModel you're going to need to subclass this and
* set the user object of the changed node to something meaningful.
public void valueForPathChanged(TreePath path, Object newValue)
XMLNode aNode = (XMLNode)path.getLastPathComponent();
aNode.setUserObject(newValue);
nodeChanged(aNode);
* Invoked this to insert newChild at location index in parents children.
* This will then message nodesWereInserted to create the appropriate
* event. This is the preferred way to add children as it will create
* the appropriate event.
public void insertNodeInto(XMLNode newChild, XMLNode parent, int index)
parent.insert(newChild, index);
int[] newIndexs = new int[1];
newIndexs[0] = index;
nodesWereInserted(parent, newIndexs);
* Message this to remove node from its parent. This will message
* nodesWereRemoved to create the appropriate event. This is the
* preferred way to remove a node as it handles the event creation
* for you.
public void removeNodeFromParent(XMLNode node)
XMLNode parent = (XMLNode)node.getParent();
if(parent == null)
throw new IllegalArgumentException("node does not have a parent.");
int[] childIndex = new int[1];
Object[] removedArray = new Object[1];
childIndex[0] = parent.getIndex(node);
parent.remove(childIndex[0]);
removedArray[0] = node;
nodesWereRemoved(parent, childIndex, removedArray);
* Invoke this method after you've changed how node is to be
* represented in the tree.
public void nodeChanged(XMLNode node)
if(listenerList != null && node != null)
XMLNode parent = (XMLNode)node.getParent();
if(parent != null)
int anIndex = parent.getIndex(node);
if(anIndex != -1)
int[] cIndexs = new int[1];
cIndexs[0] = anIndex;
nodesChanged(parent, cIndexs);
else if (node == getRoot())
nodesChanged(node, null);
* Invoke this method if you've modified the TreeNodes upon which this
* model depends. The model will notify all of its listeners that the
* model has changed.
public void reload()
loadXMLDocument();
XMLNode tempRootNode = makeRootNode();
if(!tempRootNode.equals(rootNode))
// Means that the root node itself has changed.
System.out.println("Root node changed");
reload(rootNode);
//else
checkForNodesChanged(tempRootNode, rootNode);
* Invoke this method if you've modified the TreeNodes upon which this
* model depends. The model will notify all of its listeners that the
* model has changed below the node <code>node</code> (PENDING).
public void reload(XMLNode node)
if(node != null)
fireTreeStructureChanged(this, getPathToRoot(node), null, null);
* Invoke this method after you've inserted some TreeNodes into
* node. childIndices should be the index of the new elements and
* must be sorted in ascending order.
public void nodesWereInserted(XMLNode node, int[] childIndices)
if(listenerList != null && node != null && childIndices != null
&& childIndices.length > 0)
int cCount = childIndices.length;
Object[] newChildren = new Object[cCount];
for(int counter = 0; counter < cCount; counter++)
newChildren[counter] = node.getChildAt(childIndices[counter]);
fireTreeNodesInserted(this, getPathToRoot(node), childIndices,
newChildren);
* Invoke this method after you've removed some TreeNodes from
* node. childIndices should be the index of the removed elements and
* must be sorted in ascending order. And removedChildren should be
* the array of the children objects that were removed.
public void nodesWereRemoved(XMLNode node, int[] childIndices,
Object[] removedChildren)
if(node != null && childIndices != null)
fireTreeNodesRemoved(this, getPathToRoot(node), childIndices,
removedChildren);
* Invoke this method after you've changed how the children identified by
* childIndicies are to be represented in the tree.
public void nodesChanged(XMLNode node, int[] childIndices)
if(node != null)
if (childIndices != null)
int cCount = childIndices.length;
if(cCount > 0)
Object[] cChildren = new Object[cCount];
for(int counter = 0; counter < cCount; counter++)
cChildren[counter] = node.getChildAt
(childIndices[counter]);
fireTreeNodesChanged(this, getPathToRoot(node),
childIndices, cChildren);
else if (node == getRoot())
fireTreeNodesChanged(this, getPathToRoot(node), null, null);
* Invoke this method if you've totally changed the children of
* node and its childrens children... This will post a
* treeStructureChanged event.
public void nodeStructureChanged(XMLNode node)
if(node != null)
fireTreeStructureChanged(this, getPathToRoot(node), null, null);
* Builds the parents of node up to and including the root node,
* where the original node is the last element in the returned array.
* The length of the returned array gives the node's depth in the
* tree.
* @param aNode the TreeNode to get the path for
public XMLNode[] getPathToRoot(XMLNode aNode)
return getPathToRoot(aNode, 0);
* Builds the parents of node up to and including the root node,
* where the original node is the last element in the returned array.
* The length of the returned array gives the node's depth in the
* tree.
* @param aNode the TreeNode to get the path for
* @param depth an int giving the number of steps already taken towards
* the root (on recursive calls), used to size the returned array
* @return an array of TreeNodes giving the path from the root to the
* specified node
protected XMLNode[] getPathToRoot(XMLNode aNode, int depth)
XMLNode[] retNodes;
// This method recurses, traversing towards the root in order
// size the array. On the way back, it fills in the nodes,
// starting from the root and working back to the original node.
/* Check for null, in case someone passed in a null node, or
they passed in an element that isn't rooted at root. */
if(aNode == null)
if(depth == 0)
return null;
else
retNodes = new XMLNode[depth];
else
depth++;
if(aNode == rootNode)
retNodes = new XMLNode[depth];
else
retNodes = getPathToRoot((XMLNode)aNode.getParent(), depth);
retNodes[retNodes.length - depth] = aNode;
return retNodes;
// Events
* Adds a listener for the TreeModelEvent posted after the tree changes.
* @see #removeTreeModelListener
* @param l the listener to add
public void addTreeModelListener(TreeModelListener l)
listenerList.add(TreeModelListener.class, l);
* Removes a listener previously added with <B>addTreeModelListener()</B>.
* @see #addTreeModelListener
* @param l the listener to remove
public void removeTreeModelListener(TreeModelListener l)
listenerList.remove(TreeModelListener.class, l);
* Returns an array of all the tree model listeners
* registered on this model.
* @return all of this model's <code>TreeModelListener</code>s
* or an empty
* array if no tree model listeners are currently registered
* @see #addTreeModelListener
* @see #removeTreeModelListener
* @since 1.4
public TreeModelListener[] getTreeModelListeners()
return (TreeModelListener[])listenerList.getListeners(
TreeModelListener.class);
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the parameters passed into
* the fire method.
* @param source the node being changed
* @param path the path to the root node
* @param childIndices the indices of the changed elements
* @param children the changed elements
* @see EventListenerList
protected void fireTreeNodesChanged(Object source, Object[] path,
int[] childIndices,
Object[] children)
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeModelEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2)
if (listeners==TreeModelListener.class)
// Lazily create the event:
if (e == null)
e = new TreeModelEvent(source, path,
childIndices, children);
((TreeModelListener)listeners[i+1]).treeNodesChanged(e);
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance -
Xml to JTree, and JTree node to html file.
I have been trying to figure out a way to do this and I think I have a solution, but I am not sure how to structure the application and methods.
working with BorderLayout Panel p, JSplitPane split, JTree tree, and JEditorPane rpane
1st. My JSplitpane is divided with the tree, and rpane. The tree is on the left, and the rpane is on the right. both of these are then added to the Panel p
2. I will create a method that will read through a modules.xml file, and create a JTree - tree. When you click on the node element it's information is displayed in the right pane - rpane.
The Problem. I think it would take to long to create the html file on the fly each when I click on each individual node.
So my idea is to create the html files from many xml files when I run the program. I can then just load the html file when I click on each individual node.
This means alot of heavy processing in the front end, and everything will be static, but it will be faster when the user is in the program.
Problem. How do I associate each node element with the correct html file?
The Tree elements are always the same, but I can have 1 or many modules.
Here is an example:
<device> // - root
<module1>
<Status>
<Network></Network>
<Device></Device>
<Chassis></Chassis>
<Resources></Resources>
</Status>
<ProjMngt></ProjMngt>
<ProjEdit></ProjEdit>
<Admin>
<admNetwork></admNetwork>
<admUsers></admUsers>
</Admin>
<Logging></Logging>
</Module1>
... Now I can have 1 or many Modules depending on what the xml file has in it.
<Module*n>
</device>Other problems. Some of the information I want to store as a sortable Table, but I cannot seem to get any of the sort methods to work. They work if I just open a browser, and run the html file, but if I stick the html file into the JEditorPane it does not work? - any suggestions?
Also, can I pass a JTabbebPane to the JEditorPane, or can I create a tabbed pane in html that will do the same thing.
I am working with a very small device. It does not have a web application container like Tomcat on it. Just Apache, and Java. That is why I am using Swing.Using 'productAttribute/text()' gets you all three productAttribute nodes and then grabs all the text under that node. It simply concatenates together all the text under the desired node, hence the results you are seeing. If you want to get the text for each child node separately, then you need to do something like (assumes 10.2.x.x or greater)
WITH your_table AS (SELECT
'<root><productAttribute>
<name>Baiying_attr_03</name>
<required>false</required>
</productAttribute>
<productAttribute>
<name>Baiying_attr_04</name>
<required>false</required>
</productAttribute>
<productAttribute>
<name>Baiying_attr_05</name>
<required>false</required>
</productAttribute></root>' xmldata
FROM DUAL)
-- Above simulates your DB table as I don't have it
-- You only care about the following
SELECT xt.*
FROM your_table yt,
XMLTable('/root/productAttribute'
PASSING XMLTYPE(yt.xmldata)
COLUMNS
prd_nm VARCHAR2(30) PATH 'name',
prod_rqd VARCHAR2(5) PATH 'required') xt;Note: I added a <root> node as you had just provided a XML fragment. You will need to adjust accordingly.
The above produces
PRD_NM PROD_RQD
Baiying_attr_03 false
Baiying_attr_04 false
Baiying_attr_05 false -
How to Create XML Schema From JTree ?
Please help me... Thank you.
This is Code
Tree.java ----- Run This File
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.tree.DefaultMutableTreeNode;
public class Tree extends JPanel implements ActionListener {
private int newNodeSuffix = 1;
private static String ADD_COMMAND = "add";
private static String REMOVE_COMMAND = "remove";
private static String CLEAR_COMMAND = "clear";
private static String OK_COMMAND = "ok";
private DynamicTree treePanel;
public Tree() {
super(new BorderLayout());
//Create the components.
treePanel = new DynamicTree();
//populateTree(treePanel);
JButton addButton = new JButton("Add");
addButton.setActionCommand(ADD_COMMAND);
addButton.addActionListener(this);
JButton removeButton = new JButton("Remove");
removeButton.setActionCommand(REMOVE_COMMAND);
removeButton.addActionListener(this);
JButton clearButton = new JButton("Clear");
clearButton.setActionCommand(CLEAR_COMMAND);
clearButton.addActionListener(this);
JButton okButton = new JButton("OK");
okButton.setActionCommand(OK_COMMAND);
okButton.addActionListener(this);
//Lay everything out.
treePanel.setPreferredSize(new Dimension(300, 150));
add(treePanel, BorderLayout.CENTER);
JPanel panel = new JPanel(new GridLayout(0,1));
panel.add(addButton);
panel.add(removeButton);
panel.add(clearButton);
panel.add(okButton);
add(panel, BorderLayout.LINE_END);
/*public void populateTree(DynamicTree treePanel) {
String p1Name = new String("Parent 1");
//String p2Name = new String("Parent 2");
String c1Name = new String("Child 1");
//String c2Name = new String("Child 2");
DefaultMutableTreeNode p1;
p1 = treePanel.addObject(null, p1Name);
//p2 = treePanel.addObject(null, p2Name);
treePanel.addObject(p1, c1Name);
//treePanel.addObject(p1, c2Name);
//treePanel.addObject(p2, c1Name);
//treePanel.addObject(p2, c2Name);
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (ADD_COMMAND.equals(command)) {
//Add button clicked.
treePanel.addObject("New Node " + newNodeSuffix++);
} else if (REMOVE_COMMAND.equals(command)) {
//Remove button clicked.
treePanel.removeCurrentNode();
} else if (CLEAR_COMMAND.equals(command)) {
//Clear button clicked.
treePanel.clear();
} else if (OK_COMMAND.equals(command)) {
//Ok button clicked.
treePanel.ok();
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("Craete XML Tree");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
Tree newContentPane = new Tree();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}DynamicTree.java
import javax.swing.JOptionPane;
import java.awt.GridLayout;
import java.awt.Toolkit;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
public class DynamicTree extends JPanel {
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
protected JTree tree;
private Toolkit toolkit = Toolkit.getDefaultToolkit();
public DynamicTree() {
super(new GridLayout(1,0));
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);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
/** Remove all nodes except the root node. */
public void clear() {
rootNode.removeAllChildren();
treeModel.reload();
public void ok() {
int n = JOptionPane.showConfirmDialog(null, "Do you want to create XML Schema?", "", JOptionPane.YES_NO_OPTION);
/** Remove the currently selected node. */
public void removeCurrentNode() {
TreePath currentSelection = tree.getSelectionPath();
if (currentSelection != null) {
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode)
(currentSelection.getLastPathComponent());
MutableTreeNode parent = (MutableTreeNode)(currentNode.getParent());
if (parent != null) {
treeModel.removeNodeFromParent(currentNode);
return;
// Either there was no selection, or the root was selected.
toolkit.beep();
/** Add child to the currently selected node. */
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());
//Make sure the user can see the lovely new node.
if (shouldBeVisible) {
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
class MyTreeModelListener implements TreeModelListener {
public void treeNodesChanged(TreeModelEvent e) {
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
* If the event lists children, then the changed
* node is the child of the node we've already
* gotten. Otherwise, the changed node and the
* specified node are the same.
try {
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
} catch (NullPointerException exc) {}
System.out.println("The user has finished editing the node.");
System.out.println("New value: " + node.getUserObject());
public void treeNodesInserted(TreeModelEvent e) {
public void treeNodesRemoved(TreeModelEvent e) {
public void treeStructureChanged(TreeModelEvent e) {
}XML shema is basically an XML file. So u need to know how to create an XML,
provided u know how the shema file should be.
Creating an XML :
http://forum.java.sun.com/thread.jspa?threadID=5181031&messageID=9705786#9705786 -
I've been looking for a solution to this problem for some time now, and still no luck.
I'm going to point out first that I do NOT know the exact structure of the Tree Model. This is because the user can manipulate the tree as they wish. My problem comes when I want to save/load this tree structure, I thought that XML seems like the ideal choice.
My problem is that because I don't know the structure of the Tree Model, I'm not sure how to loop through every node in the Tree Model and add it to my XML Document.
People have suggested looping through the Tree Models children, except that wouldn't return the many other nodes that may be in the Tree Model.
If I haven't explained it very well, or you need to know any extra info just reply asking.
Hope someone out there can give me a hand, cheers!You could get the root node as DefaultMutableTreeNode:
TreeModel treeMdl = jTree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) treeMdl.getRoot(); and traverse the tree from there.
DefaultMutableTreeNode class has some related methods:
public Enumeration preorderEnumeration()
public Enumeration postorderEnumeration()
public Enumeration breadthFirstEnumeration()
public Enumeration depthFirstEnumeration()
public int getChildCount()
public TreeNode getChildAt(int index) -
Deleting Nodes from XML Tree (JTree)
I have created a XML Tree(extended from JTree) using XNodes ( extended from DefaultMutableTreeNode)
After some insertions, i need to delete certain nodes from the XML Tree.. but after deletion, XNode will be null.
subroutine is as follows...
appreciates any advice
Thanx
private XNode RemoveExtraNode( XNode xNode ){
int child;
String nodeType;
XNode childNode=null;
if ( (child=xNode.getChildCount() ) > 0){
for(int i=0;i<child;i++){
childNode=(XNode)xNode.getChildAt(i);
nodeType = childNode.getType();
if(nodeType.equals("DTD") )
childNode.removeFromParent();
}//end for (int i=1;i<child;i++)
}//endif((child=xNode.getChildCount())!=0)
return xNode;
}//RemoveExtraNodeHi IKEDA
Thanx for the reply.
I have tried xNode.remove(childNode) b4 and it still return a null JTree.
Anyway fyi i discover i can delete last child of xNode and return the correct java tree. therefore to delete a node of my choice i simply insert its next sibling nodes in its place and delete that particular node when it becomes the last child. -
Hey,
Does anyone have any code on how to convert an XML file into a JTree. I also need to be able to convert a JTree into XML.
Any help would be great!http://java.sun.com/webservices/jaxp/dist/1.1/docs/tutorial/dom/3_tree.html
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Every few weeks I'll get an error message telling me the password for my gmail account is rejected. This even thought I've changed nothing! It's extremely aggravating and wastes time. does anyone know what might be happening? I'm becoming ever mo
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Help with Flex preloading and transitions please
I downloaded and installed Flex Builder 3, and I think I have my slideshow project about 75% finished. It's the last 25% that I can't figure out, regarding preloading and transitions. Can someone take a look at the code below and see if you can help
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Ok heres the issue. I have a Power Mac G5 with graphics card that has one DVI port and one ADC port. I am trying to hook up dual monitors. Now after the apple store told me to buy a 30 dollar adaptor that converts a ADC to DVI-D, i then realized i ne