domecho06.java

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/*
 * @(#)DomEcho06.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.
 */

import javax.xml.parsers.DocumentBuilderFactory;  
import javax.xml.parsers.FactoryConfigurationError;  
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 org.w3c.dom.DOMException;
import org.w3c.dom.Element;

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 DomEcho06  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 = false;
    static final int windowHeight = 460;
    static final int leftWidth = 300;
    static final int rightWidth = 340;
    static final int windowWidth = leftWidth + rightWidth;

    public DomEcho06()
    {
       // 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
       // (must be final to be referenced in inner class)
       final 
       JEditorPane htmlPane = new JEditorPane("text/html","");
       htmlPane.setEditable(false);
       JScrollPane htmlView = new JScrollPane(htmlPane);
       htmlView.setPreferredSize( 
           new Dimension( rightWidth, windowHeight ));

       // Wire the two views together. Use a selection listener 
       // created with an anonymous inner-class adapter.
       tree.addTreeSelectionListener(
         new TreeSelectionListener() {
           public void valueChanged(TreeSelectionEvent e) {
             TreePath p = e.getNewLeadSelectionPath();
             if (p != null) {
               AdapterNode adpNode = 
                  (AdapterNode) p.getLastPathComponent();
               htmlPane.setText(adpNode.content());
             }
           }
         }
       );

       // 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) {
            buildDom();
            makeFrame();
            return;
        }

        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 DomEcho06 echoPanel = 
           new DomEcho06();
        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
    public static void buildDom ()
    {
        DocumentBuilderFactory factory =
           DocumentBuilderFactory.newInstance();
        try {
          DocumentBuilder builder = factory.newDocumentBuilder();
          document = builder.newDocument();  // Create from whole cloth

          Element root = 
                  (Element) document.createElement("rootElement"); 
          document.appendChild (root);
          root.appendChild( document.createTextNode("Some") );
          root.appendChild( document.createTextNode(" ")    );
          root.appendChild( document.createTextNode("text") );

          // normalize text representation
          // getDocumentElement() returns the document's root node
          document.getDocumentElement().normalize();


        } catch (ParserConfigurationException pce) {
            // Parser with specified options can't be built
            pce.printStackTrace();

        }
    } // buildDom

    // 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;
    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;