/*
* @(#)DomEcho03.java 1.9 98/11/10
*
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
package org.sintef.umt.transgen;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.DocumentBuilder;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.w3c.dom.Document;
import java.io.File;
import java.io.IOException;
// Basic GUI components
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
// GUI components for right-hand side
import javax.swing.JSplitPane;
import javax.swing.JEditorPane;
// GUI support classes
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
// For creating borders
import javax.swing.border.EmptyBorder;
import javax.swing.border.BevelBorder;
import javax.swing.border.CompoundBorder;
// For creating a TreeModel
import javax.swing.tree.*;
import javax.swing.event.*;
import java.util.*;
public class DomEcho03 extends JPanel
{
// Global value so it can be ref'd by the tree-adapter
static Document document;
// Could set this with a command-line argument, but
// not much point -- the list of tree elements still
// has to be defined internally.
// Extra credit: Read the list from a file
// Super-extra credit: Process a DTD and build the list
// --no standard DTD parsers!
boolean compress = true;
static final int windowHeight = 460;
static final int leftWidth = 300;
static final int rightWidth = 340;
static final int windowWidth = leftWidth + rightWidth;
public DomEcho03()
{
// Make a nice border
EmptyBorder eb = new EmptyBorder(5,5,5,5);
BevelBorder bb = new BevelBorder(BevelBorder.LOWERED);
CompoundBorder cb = new CompoundBorder(eb,bb);
this.setBorder(new CompoundBorder(cb,eb));
// Set up the tree
JTree tree = new JTree(new DomToTreeModelAdapter());
// Iterate over the tree and make nodes visible
// (Otherwise, the tree shows up fully collapsed)
// TreePath nodePath = ???;
// tree.expandPath(nodePath);
// Build left-side view
JScrollPane treeView = new JScrollPane(tree);
treeView.setPreferredSize(
new Dimension( leftWidth, windowHeight ));
// Build right-side view
JEditorPane htmlPane = new JEditorPane("text/html","");
htmlPane.setEditable(false);
JScrollPane htmlView = new JScrollPane(htmlPane);
htmlView.setPreferredSize(
new Dimension( rightWidth, windowHeight ));
// Build split-pane view
JSplitPane splitPane =
new JSplitPane( JSplitPane.HORIZONTAL_SPLIT,
treeView,
htmlView );
splitPane.setContinuousLayout( true );
splitPane.setDividerLocation( leftWidth );
splitPane.setPreferredSize(
new Dimension( windowWidth + 10, windowHeight+10 ));
// Add GUI components
this.setLayout(new BorderLayout());
this.add("Center", splitPane );
} // constructor
public static void main (String argv [])
{
if (argv.length != 1) {
System.err.println ("Usage: java DomEcho filename");
System.exit (1);
}
DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
document = builder.parse( new File(argv[0]) );
makeFrame();
} catch (SAXParseException spe) {
// Error generated by the parser
System.out.println ("\n** Parsing error"
+ ", line " + spe.getLineNumber ()
+ ", uri " + spe.getSystemId ());
System.out.println(" " + spe.getMessage() );
// Use the contained exception, if any
Exception x = spe;
if (spe.getException() != null)
x = spe.getException();
x.printStackTrace();
} catch (SAXException sxe) {
// Error generated by this application
// (or a parser-initialization error)
Exception x = sxe;
if (sxe.getException() != null)
x = sxe.getException();
x.printStackTrace();
} catch (ParserConfigurationException pce) {
// Parser with specified options can't be built
pce.printStackTrace();
} catch (IOException ioe) {
// I/O error
ioe.printStackTrace();
}
} // main
public static void makeFrame() {
// Set up a GUI framework
JFrame frame = new JFrame("DOM Echo");
frame.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
}
);
// Set up the tree, the views, and display it all
final DomEcho03 echoPanel =
new DomEcho03();
frame.getContentPane().add("Center", echoPanel );
frame.pack();
Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
int w = windowWidth + 10;
int h = windowHeight + 10;
frame.setLocation(screenSize.width/3 - w/2,
screenSize.height/2 - h/2);
frame.setSize(w, h);
frame.setVisible(true);
} // makeFrame
// An array of names for DOM node-types
static final String[] typeName = {
"none",
"Element",
"Attr",
"Text",
"CDATA",
"EntityRef",
"Entity",
"ProcInstr",
"Comment",
"Document",
"DocType",
"DocFragment",
"Notation",
};
static final int ELEMENT_TYPE = 1;
// The list of elements to display in the tree
static String[] treeElementNames = {
"slideshow",
"slide",
"title", // For slideshow #1
"slide-title", // For slideshow #10
"item",
};
boolean treeElement(String elementName) {
for (int i=0; i<treeElementNames.length; i++) {
if ( elementName.equals(treeElementNames[i]) ) return true;
}
return false;
}
// This class wraps a DOM node and returns the text we want to
// display in the tree. It also returns children, index values,
// and child counts.
public class AdapterNode
{
org.w3c.dom.Node domNode;
// Construct an Adapter node from a DOM node
public AdapterNode(org.w3c.dom.Node node) {
domNode = node;
}
// Return a string that identifies this node in the tree
// *** Refer to table at top of org.w3c.dom.Node ***
public String toString() {
String s = typeName[domNode.getNodeType()];
String nodeName = domNode.getNodeName();
if (! nodeName.startsWith("#")) {
s += ": " + nodeName;
}
if (domNode.getNodeValue() != null) {
if (s.startsWith("ProcInstr"))
s += ", ";
else
s += ": ";
// Trim the value to get rid of NL's at the front
String t = domNode.getNodeValue().trim();
int x = t.indexOf("\n");
if (x >= 0) t = t.substring(0, x);
s += t;
}
return s;
}
/*
* Return children, index, and count values
*/
public int index(AdapterNode child) {
// System.err.println("Looking for index of " + child);
int count = childCount();
for (int i=0; i<count; i++) {
AdapterNode n = this.child(i);
if (child.domNode == n.domNode) return i;
}
return -1; // Should never get here.
}
public AdapterNode child(int searchIndex) {
// Note: JTree index is zero-based.
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 AdapterNode(node);
}
public int childCount() {
if (!compress) {
// Indent this
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;
}
}
// This adapter converts the current Document (a DOM) into
// a JTree model.
public class DomToTreeModelAdapter
implements javax.swing.tree.TreeModel
{
// Basic TreeModel operations
public Object getRoot() {
// System.err.println("Returning root: " +document);
return new AdapterNode(document);
}
public boolean isLeaf(Object aNode) {
// Determines whether the icon shows up to the left.
// Return true for any node with no children
AdapterNode node = (AdapterNode) aNode;
if (node.childCount() > 0) return false;
return true;
}
public int getChildCount(Object parent) {
AdapterNode node = (AdapterNode) parent;
return node.childCount();
}
public Object getChild(Object parent, int index) {
AdapterNode node = (AdapterNode) parent;
return node.child(index);
}
public int getIndexOfChild(Object parent, Object child) {
AdapterNode node = (AdapterNode) parent;
return node.index((AdapterNode) child);
}
public void valueForPathChanged(TreePath path, Object newValue) {
// Null. We won't be making changes in the GUI
// If we did, we would ensure the new value was really new,
// adjust the model, and then fire a TreeNodesChanged event.
}
/*
* Use these methods to add and remove event listeners.
* (Needed to satisfy TreeModel interface, but not used.)
*/
private Vector listenerList = new Vector();
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 );
}
}
// Note: Since XML works with 1.1, this example uses Vector.
// If coding for 1.2 or later, though, I'd use this instead:
// private List listenerList = new LinkedList();
// The operations on the List are then add(), remove() and
// iteration, via:
// Iterator it = listenerList.iterator();
// while ( it.hasNext() ) {
// TreeModelListener listener = (TreeModelListener)it.next();
// ...
// }
/*
* Invoke these methods to inform listeners of changes.
* (Not needed for this example.)
* Methods taken from TreeModelSupport class described at
* http:// java.sun.com/products/jfc/tsc/articles/jtree/index.html
* That architecture (produced by Tom Santos and Steve Wilson)
* is more elegant. I just hacked 'em in here so they are
* immediately at hand.
*/
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 );
}
}
}
}