Clients/Java/BrowserApp.java - third_party/mdnsresponder - Git at Google

 /* -*- Mode: Java; tab-width: 4 -*-
  *
  * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
  *
  * Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
  * ("Apple") in consideration of your agreement to the following terms, and your
  * use, installation, modification or redistribution of this Apple software
  * constitutes acceptance of these terms.  If you do not agree with these terms,
  * please do not use, install, modify or redistribute this Apple software.
  *
  * In consideration of your agreement to abide by the following terms, and subject
  * to these terms, Apple grants you a personal, non-exclusive license, under Apple's
  * copyrights in this original Apple software (the "Apple Software"), to use,
  * reproduce, modify and redistribute the Apple Software, with or without
  * modifications, in source and/or binary forms; provided that if you redistribute
  * the Apple Software in its entirety and without modifications, you must retain
  * this notice and the following text and disclaimers in all such redistributions of
  * the Apple Software.  Neither the name, trademarks, service marks or logos of
  * Apple Computer, Inc. may be used to endorse or promote products derived from the
  * Apple Software without specific prior written permission from Apple.  Except as
  * expressly stated in this notice, no other rights or licenses, express or implied,
  * are granted by Apple herein, including but not limited to any patent rights that
  * may be infringed by your derivative works or by other works in which the Apple
  * Software may be incorporated.
  *
  * The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
  * WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
  * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
  * COMBINATION WITH YOUR PRODUCTS.
  *
  * IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
  * OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
  * (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 	BrowserApp demonstrates how to use DNS-SD to browse for and resolve services.

 	To do:
 	- display resolved TXTRecord
  */


 import java.awt.*;
 import java.awt.event.*;
 import java.util.*;
 import java.text.*;
 import javax.swing.*;
 import javax.swing.event.*;

 import com.apple.dnssd.*;


 class	BrowserApp implements ListSelectionListener, ResolveListener, Runnable
 {
 	static BrowserApp	app;
 	JFrame				frame;
 	DomainListModel		domainList;
 	BrowserListModel	servicesList, serviceList;
 	JList				domainPane, servicesPane, servicePane;
 	DNSSDService		servicesBrowser, serviceBrowser, domainBrowser;
 	JLabel				hostLabel, portLabel;
 	String				hostNameForUpdate;
 	int					portForUpdate;

 	public		BrowserApp()
 	{
 		frame = new JFrame("DNS-SD Service Browser");
 		frame.addWindowListener(new WindowAdapter() {
 			public void windowClosing(WindowEvent e) {System.exit(0);}
 		});

 		domainList = new DomainListModel();
 		servicesList = new ServicesBrowserListModel();
 		serviceList = new BrowserListModel();

 		try {
 			domainBrowser = DNSSD.enumerateDomains( DNSSD.BROWSE_DOMAINS, 0, domainList);

 			servicesBrowser = DNSSD.browse( 0, 0, "_services._dns-sd._udp.", "", servicesList);
 			serviceBrowser = null;
 		}
 		catch ( Exception ex) { terminateWithException( ex); }

 		this.setupSubPanes( frame.getContentPane());
 		frame.pack();
 		frame.setVisible(true);
 	}

 	protected void	setupSubPanes( Container parent)
 	{
 		parent.setLayout( new BoxLayout( parent, BoxLayout.Y_AXIS));

 		JPanel browserRow = new JPanel();
 		browserRow.setLayout( new BoxLayout( browserRow, BoxLayout.X_AXIS));
 		domainPane = new JList( domainList);
 		domainPane.addListSelectionListener( this);
 		JScrollPane domainScroller = new JScrollPane( domainPane, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
 		browserRow.add( domainScroller);
 		servicesPane = new JList( servicesList);
 		servicesPane.addListSelectionListener( this);
 		JScrollPane servicesScroller = new JScrollPane( servicesPane, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
 		browserRow.add( servicesScroller);
 		servicePane = new JList( serviceList);
 		servicePane.addListSelectionListener( this);
 		JScrollPane serviceScroller = new JScrollPane( servicePane, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
 		browserRow.add( serviceScroller);

 /*
 		JPanel buttonRow = new JPanel();
 		buttonRow.setLayout( new BoxLayout( buttonRow, BoxLayout.X_AXIS));
 		buttonRow.add( Box.createHorizontalGlue());
 		JButton connectButton = new JButton( "Don't Connect");
 		buttonRow.add( connectButton);
 		buttonRow.add( Box.createRigidArea( new Dimension( 16, 0)));
 */

 		JPanel labelRow = new JPanel();
 		labelRow.setLayout( new BoxLayout( labelRow, BoxLayout.X_AXIS));
 		labelRow.add( new JLabel( "  Host: "));
 		hostLabel = new JLabel();
 		labelRow.add( hostLabel);
 		labelRow.add( Box.createRigidArea( new Dimension( 32, 0)));
 		labelRow.add( new JLabel( "Port: "));
 		portLabel = new JLabel();
 		labelRow.add( portLabel);
 		labelRow.add( Box.createHorizontalGlue());

 		parent.add( browserRow);
 		parent.add( Box.createRigidArea( new Dimension( 0, 8)));
 		parent.add( labelRow);
 //		parent.add( buttonRow);
 		parent.add( Box.createRigidArea( new Dimension( 0, 16)));
 	}

 	public void valueChanged( ListSelectionEvent e)
 	{
 		try {
 			if ( e.getSource() == domainPane && !e.getValueIsAdjusting())
 			{
 				int		newSel = domainPane.getSelectedIndex();
 				if ( -1 != newSel)
 				{
 					if ( serviceBrowser != null)
 						serviceBrowser.stop();
 					serviceList.removeAllElements();
 					servicesBrowser = DNSSD.browse( 0, 0, "_services._dns-sd._udp.", "", servicesList);
 				}
 			}
 			else if ( e.getSource() == servicesPane && !e.getValueIsAdjusting())
 			{
 				int		newSel = servicesPane.getSelectedIndex();
 				if ( serviceBrowser != null)
 					serviceBrowser.stop();
 				serviceList.removeAllElements();
 				if ( -1 != newSel)
 					serviceBrowser = DNSSD.browse( 0, 0, servicesList.getNthRegType( newSel), "", serviceList);
 			}
 			else if ( e.getSource() == servicePane && !e.getValueIsAdjusting())
 			{
 				int		newSel = servicePane.getSelectedIndex();

 				hostLabel.setText( "");
 				portLabel.setText( "");

 				if ( -1 != newSel)
 				{
 					DNSSD.resolve( 0, serviceList.getNthInterface( newSel),
 										serviceList.getNthServiceName( newSel),
 										serviceList.getNthRegType( newSel),
 										serviceList.getNthDomain( newSel),
 										this);
 				}
 			}
 		}
 		catch ( Exception ex) { terminateWithException( ex); }
 	}

 	public void run()
 	{
 		hostLabel.setText( hostNameForUpdate);
 		portLabel.setText( String.valueOf( portForUpdate));
 	}

 	public void	serviceResolved( DNSSDService resolver, int flags, int ifIndex, String fullName,
 								String hostName, int port, TXTRecord txtRecord)
 	{
 		// We want to update GUI on the AWT event dispatching thread, but we can't stop
 		// the resolve from that thread, since stop() is synchronized with this callback.
 		// So, we stop the resolve on this thread, then invokeAndWait on the AWT event thread.

 		resolver.stop();

 		hostNameForUpdate = hostName;
 		portForUpdate = port;

 		try {
 			SwingUtilities.invokeAndWait(this);
 		}
 		catch ( Exception e)
 		{
 			e.printStackTrace();
 		}
 	}

 	public void	operationFailed( DNSSDService service, int errorCode)
 	{
 		service.stop();
 		// handle failure here
 	}

 	protected static void	terminateWithException( Exception e)
 	{
 		e.printStackTrace();
 		System.exit( -1);
 	}

     public static void main(String s[])
     {
 		app = new BrowserApp();
     }
 }


 class	BrowserListModel extends DefaultListModel implements BrowseListener, Runnable
 {
 	public		BrowserListModel()
 	{
 		addCache = new Vector();
 		removeCache = new Vector();
 	}

 	/* The Browser invokes this callback when a service is discovered. */
 	public void	serviceFound( DNSSDService browser, int flags, int ifIndex,
 							String serviceName, String regType, String domain)
 	{
 		addCache.add( new BrowserListElem( serviceName, domain, regType, ifIndex));
 		if ( ( flags & DNSSD.MORE_COMING) == 0)
 			this.scheduleOnEventThread();
 	}

 	public void	serviceLost( DNSSDService browser, int flags, int ifIndex,
 							String serviceName, String regType, String domain)
 	{
 		removeCache.add( serviceName);
 		if ( ( flags & DNSSD.MORE_COMING) == 0)
 			this.scheduleOnEventThread();
 	}

 	public void	run()
 	{
 		while ( removeCache.size() > 0)
 		{
 			String	serviceName = (String) removeCache.remove( removeCache.size() - 1);
 			int		matchInd = this.findMatching( serviceName);	// probably doesn't handle near-duplicates well.
 			if ( matchInd != -1)
 				this.removeElementAt( matchInd);
 		}
 		while ( addCache.size() > 0)
 		{
 			BrowserListElem	elem = (BrowserListElem) addCache.remove( addCache.size() - 1);
 			if ( -1 == this.findMatching( elem.fServiceName))	// probably doesn't handle near-duplicates well.
 				this.addInSortOrder( elem);
 		}
 	}

 	public void	operationFailed( DNSSDService service, int errorCode)
 	{
 		// handle failure here
 	}

 	/* The list contains BrowserListElem's */
 	class	BrowserListElem
 	{
 		public	BrowserListElem( String serviceName, String domain, String type, int ifIndex)
 		{ fServiceName = serviceName; fDomain = domain; fType = type; fInt = ifIndex; }

 		public String	toString() { return fServiceName; }

 		public String	fServiceName, fDomain, fType;
 		public int		fInt;
 	}

 	public String	getNthServiceName( int n)
 	{
 		BrowserListElem sel = (BrowserListElem) this.get( n);
 		return sel.fServiceName;
 	}

 	public String	getNthRegType( int n)
 	{
 		BrowserListElem sel = (BrowserListElem) this.get( n);
 		return sel.fType;
 	}

 	public String	getNthDomain( int n)
 	{
 		BrowserListElem sel = (BrowserListElem) this.get( n);
 		return sel.fDomain;
 	}

 	public int		getNthInterface( int n)
 	{
 		BrowserListElem sel = (BrowserListElem) this.get( n);
 		return sel.fInt;
 	}

 	protected void	addInSortOrder( Object obj)
 	{
 		int	i;
 		for ( i = 0; i < this.size(); i++)
 			if ( sCollator.compare( obj.toString(), this.getElementAt( i).toString()) < 0)
 				break;
 		this.add( i, obj);
 	}

 	protected int	findMatching( String match)
 	{
 		for ( int i = 0; i < this.size(); i++)
 			if ( match.equals( this.getElementAt( i).toString()))
 				return i;
 		return -1;
 	}

 	protected void	scheduleOnEventThread()
 	{
 		try {
 			SwingUtilities.invokeAndWait( this);
 		}
 		catch ( Exception e)
 		{
 			e.printStackTrace();
 		}
 	}

 	protected Vector	removeCache;	// list of serviceNames to remove
 	protected Vector	addCache;		// list of BrowserListElem's to add

 	protected static Collator	sCollator;

 	static	// Initialize our static variables
 	{
 		sCollator = Collator.getInstance();
 		sCollator.setStrength( Collator.PRIMARY);
 	}
 }


 class	ServicesBrowserListModel extends BrowserListModel
 {
 	/* The Browser invokes this callback when a service is discovered. */
 	public void	serviceFound( DNSSDService browser, int flags, int ifIndex,
 							String serviceName, String regType, String domain)
 	// Overridden to stuff serviceName into regType and make serviceName human-readable.
 	{
 		regType = serviceName + ( regType.startsWith( "_udp.") ? "._udp." : "._tcp.");
 		super.serviceFound( browser, flags, ifIndex, this.mapTypeToName( serviceName), regType, domain);
 	}

 	public void	serviceLost( DNSSDService browser, int flags, int ifIndex,
 							String serviceName, String regType, String domain)
 	// Overridden to make serviceName human-readable.
 	{
 		super.serviceLost( browser, flags, ifIndex, this.mapTypeToName( serviceName), regType, domain);
 	}

 	protected String	mapTypeToName( String type)
 	// Convert a registration type into a human-readable string. Returns original string on no-match.
 	{
 		final String[]	namedServices = {
 			"_afpovertcp",	"Apple File Sharing",
 			"_http",		"World Wide Web servers",
 			"_daap",		"Digital Audio Access",
 			"_apple-sasl",	"Apple Password Servers",
 			"_distcc",		"Distributed Compiler nodes",
 			"_finger",		"Finger servers",
 			"_ichat",		"iChat clients",
 			"_presence",	"iChat AV clients",
 			"_ssh",			"SSH servers",
 			"_telnet",		"Telnet servers",
 			"_workstation",	"Macintosh Manager clients",
 			"_bootps",		"BootP servers",
 			"_xserveraid",	"XServe RAID devices",
 			"_eppc",		"Remote AppleEvents",
 			"_ftp",			"FTP services",
 			"_tftp",		"TFTP services"
 		};

 		for ( int i = 0; i < namedServices.length; i+=2)
 			if ( namedServices[i].equals( type))
 				return namedServices[i + 1];
 		return type;
 	}
 }


 class	DomainListModel extends DefaultListModel implements DomainListener
 {
 	/* Called when a domain is discovered. */
 	public void	domainFound( DNSSDService domainEnum, int flags, int ifIndex, String domain)
 	{
 		if ( !this.contains( domain))
 			this.addElement( domain);
 	}

 	public void	domainLost( DNSSDService domainEnum, int flags, int ifIndex, String domain)
 	{
 		if ( this.contains( domain))
 			this.removeElement( domain);
 	}

 	public void	operationFailed( DNSSDService service, int errorCode)
 	{
 		// handle failure here
 	}
 }
	/* -- Mode: Java; tab-width: 4 --
	*
	* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
	*
	* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
	* ("Apple") in consideration of your agreement to the following terms, and your
	* use, installation, modification or redistribution of this Apple software
	* constitutes acceptance of these terms. If you do not agree with these terms,
	* please do not use, install, modify or redistribute this Apple software.
	*
	* In consideration of your agreement to abide by the following terms, and subject
	* to these terms, Apple grants you a personal, non-exclusive license, under Apple's
	* copyrights in this original Apple software (the "Apple Software"), to use,
	* reproduce, modify and redistribute the Apple Software, with or without
	* modifications, in source and/or binary forms; provided that if you redistribute
	* the Apple Software in its entirety and without modifications, you must retain
	* this notice and the following text and disclaimers in all such redistributions of
	* the Apple Software. Neither the name, trademarks, service marks or logos of
	* Apple Computer, Inc. may be used to endorse or promote products derived from the
	* Apple Software without specific prior written permission from Apple. Except as
	* expressly stated in this notice, no other rights or licenses, express or implied,
	* are granted by Apple herein, including but not limited to any patent rights that
	* may be infringed by your derivative works or by other works in which the Apple
	* Software may be incorporated.
	*
	* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
	* WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
	* WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
	* COMBINATION WITH YOUR PRODUCTS.
	*
	* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
	* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
	* OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
	* (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
	* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	BrowserApp demonstrates how to use DNS-SD to browse for and resolve services.

	To do:
	- display resolved TXTRecord
	*/


	import java.awt.*;
	import java.awt.event.*;
	import java.util.*;
	import java.text.*;
	import javax.swing.*;
	import javax.swing.event.*;

	import com.apple.dnssd.*;


	class BrowserApp implements ListSelectionListener, ResolveListener, Runnable
	{
	static BrowserApp app;
	JFrame frame;
	DomainListModel domainList;
	BrowserListModel servicesList, serviceList;
	JList domainPane, servicesPane, servicePane;
	DNSSDService servicesBrowser, serviceBrowser, domainBrowser;
	JLabel hostLabel, portLabel;
	String hostNameForUpdate;
	int portForUpdate;

	public BrowserApp()
	{
	frame = new JFrame("DNS-SD Service Browser");
	frame.addWindowListener(new WindowAdapter() {
	public void windowClosing(WindowEvent e) {System.exit(0);}
	});

	domainList = new DomainListModel();
	servicesList = new ServicesBrowserListModel();
	serviceList = new BrowserListModel();

	try {
	domainBrowser = DNSSD.enumerateDomains( DNSSD.BROWSE_DOMAINS, 0, domainList);

	servicesBrowser = DNSSD.browse( 0, 0, "_services._dns-sd._udp.", "", servicesList);
	serviceBrowser = null;
	}
	catch ( Exception ex) { terminateWithException( ex); }

	this.setupSubPanes( frame.getContentPane());
	frame.pack();
	frame.setVisible(true);
	}

	protected void setupSubPanes( Container parent)
	{
	parent.setLayout( new BoxLayout( parent, BoxLayout.Y_AXIS));

	JPanel browserRow = new JPanel();
	browserRow.setLayout( new BoxLayout( browserRow, BoxLayout.X_AXIS));
	domainPane = new JList( domainList);
	domainPane.addListSelectionListener( this);
	JScrollPane domainScroller = new JScrollPane( domainPane, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
	browserRow.add( domainScroller);
	servicesPane = new JList( servicesList);
	servicesPane.addListSelectionListener( this);
	JScrollPane servicesScroller = new JScrollPane( servicesPane, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
	browserRow.add( servicesScroller);
	servicePane = new JList( serviceList);
	servicePane.addListSelectionListener( this);
	JScrollPane serviceScroller = new JScrollPane( servicePane, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
	browserRow.add( serviceScroller);

	/*
	JPanel buttonRow = new JPanel();
	buttonRow.setLayout( new BoxLayout( buttonRow, BoxLayout.X_AXIS));
	buttonRow.add( Box.createHorizontalGlue());
	JButton connectButton = new JButton( "Don't Connect");
	buttonRow.add( connectButton);
	buttonRow.add( Box.createRigidArea( new Dimension( 16, 0)));
	*/

	JPanel labelRow = new JPanel();
	labelRow.setLayout( new BoxLayout( labelRow, BoxLayout.X_AXIS));
	labelRow.add( new JLabel( " Host: "));
	hostLabel = new JLabel();
	labelRow.add( hostLabel);
	labelRow.add( Box.createRigidArea( new Dimension( 32, 0)));
	labelRow.add( new JLabel( "Port: "));
	portLabel = new JLabel();
	labelRow.add( portLabel);
	labelRow.add( Box.createHorizontalGlue());

	parent.add( browserRow);
	parent.add( Box.createRigidArea( new Dimension( 0, 8)));
	parent.add( labelRow);
	// parent.add( buttonRow);
	parent.add( Box.createRigidArea( new Dimension( 0, 16)));
	}

	public void valueChanged( ListSelectionEvent e)
	{
	try {
	if ( e.getSource() == domainPane && !e.getValueIsAdjusting())
	{
	int newSel = domainPane.getSelectedIndex();
	if ( -1 != newSel)
	{
	if ( serviceBrowser != null)
	serviceBrowser.stop();
	serviceList.removeAllElements();
	servicesBrowser = DNSSD.browse( 0, 0, "_services._dns-sd._udp.", "", servicesList);
	}
	}
	else if ( e.getSource() == servicesPane && !e.getValueIsAdjusting())
	{
	int newSel = servicesPane.getSelectedIndex();
	if ( serviceBrowser != null)
	serviceBrowser.stop();
	serviceList.removeAllElements();
	if ( -1 != newSel)
	serviceBrowser = DNSSD.browse( 0, 0, servicesList.getNthRegType( newSel), "", serviceList);
	}
	else if ( e.getSource() == servicePane && !e.getValueIsAdjusting())
	{
	int newSel = servicePane.getSelectedIndex();

	hostLabel.setText( "");
	portLabel.setText( "");

	if ( -1 != newSel)
	{
	DNSSD.resolve( 0, serviceList.getNthInterface( newSel),
	serviceList.getNthServiceName( newSel),
	serviceList.getNthRegType( newSel),
	serviceList.getNthDomain( newSel),
	this);
	}
	}
	}
	catch ( Exception ex) { terminateWithException( ex); }
	}

	public void run()
	{
	hostLabel.setText( hostNameForUpdate);
	portLabel.setText( String.valueOf( portForUpdate));
	}

	public void serviceResolved( DNSSDService resolver, int flags, int ifIndex, String fullName,
	String hostName, int port, TXTRecord txtRecord)
	{
	// We want to update GUI on the AWT event dispatching thread, but we can't stop
	// the resolve from that thread, since stop() is synchronized with this callback.
	// So, we stop the resolve on this thread, then invokeAndWait on the AWT event thread.

	resolver.stop();

	hostNameForUpdate = hostName;
	portForUpdate = port;

	try {
	SwingUtilities.invokeAndWait(this);
	}
	catch ( Exception e)
	{
	e.printStackTrace();
	}
	}

	public void operationFailed( DNSSDService service, int errorCode)
	{
	service.stop();
	// handle failure here
	}

	protected static void terminateWithException( Exception e)
	{
	e.printStackTrace();
	System.exit( -1);
	}

	public static void main(String s[])
	{
	app = new BrowserApp();
	}
	}


	class BrowserListModel extends DefaultListModel implements BrowseListener, Runnable
	{
	public BrowserListModel()
	{
	addCache = new Vector();
	removeCache = new Vector();
	}

	/* The Browser invokes this callback when a service is discovered. */
	public void serviceFound( DNSSDService browser, int flags, int ifIndex,
	String serviceName, String regType, String domain)
	{
	addCache.add( new BrowserListElem( serviceName, domain, regType, ifIndex));
	if ( ( flags & DNSSD.MORE_COMING) == 0)
	this.scheduleOnEventThread();
	}

	public void serviceLost( DNSSDService browser, int flags, int ifIndex,
	String serviceName, String regType, String domain)
	{
	removeCache.add( serviceName);
	if ( ( flags & DNSSD.MORE_COMING) == 0)
	this.scheduleOnEventThread();
	}

	public void run()
	{
	while ( removeCache.size() > 0)
	{
	String serviceName = (String) removeCache.remove( removeCache.size() - 1);
	int matchInd = this.findMatching( serviceName); // probably doesn't handle near-duplicates well.
	if ( matchInd != -1)
	this.removeElementAt( matchInd);
	}
	while ( addCache.size() > 0)
	{
	BrowserListElem elem = (BrowserListElem) addCache.remove( addCache.size() - 1);
	if ( -1 == this.findMatching( elem.fServiceName)) // probably doesn't handle near-duplicates well.
	this.addInSortOrder( elem);
	}
	}

	public void operationFailed( DNSSDService service, int errorCode)
	{
	// handle failure here
	}

	/* The list contains BrowserListElem's */
	class BrowserListElem
	{
	public BrowserListElem( String serviceName, String domain, String type, int ifIndex)
	{ fServiceName = serviceName; fDomain = domain; fType = type; fInt = ifIndex; }

	public String toString() { return fServiceName; }

	public String fServiceName, fDomain, fType;
	public int fInt;
	}

	public String getNthServiceName( int n)
	{
	BrowserListElem sel = (BrowserListElem) this.get( n);
	return sel.fServiceName;
	}

	public String getNthRegType( int n)
	{
	BrowserListElem sel = (BrowserListElem) this.get( n);
	return sel.fType;
	}

	public String getNthDomain( int n)
	{
	BrowserListElem sel = (BrowserListElem) this.get( n);
	return sel.fDomain;
	}

	public int getNthInterface( int n)
	{
	BrowserListElem sel = (BrowserListElem) this.get( n);
	return sel.fInt;
	}

	protected void addInSortOrder( Object obj)
	{
	int i;
	for ( i = 0; i < this.size(); i++)
	if ( sCollator.compare( obj.toString(), this.getElementAt( i).toString()) < 0)
	break;
	this.add( i, obj);
	}

	protected int findMatching( String match)
	{
	for ( int i = 0; i < this.size(); i++)
	if ( match.equals( this.getElementAt( i).toString()))
	return i;
	return -1;
	}

	protected void scheduleOnEventThread()
	{
	try {
	SwingUtilities.invokeAndWait( this);
	}
	catch ( Exception e)
	{
	e.printStackTrace();
	}
	}

	protected Vector removeCache; // list of serviceNames to remove
	protected Vector addCache; // list of BrowserListElem's to add

	protected static Collator sCollator;

	static // Initialize our static variables
	{
	sCollator = Collator.getInstance();
	sCollator.setStrength( Collator.PRIMARY);
	}
	}


	class ServicesBrowserListModel extends BrowserListModel
	{
	/* The Browser invokes this callback when a service is discovered. */
	public void serviceFound( DNSSDService browser, int flags, int ifIndex,
	String serviceName, String regType, String domain)
	// Overridden to stuff serviceName into regType and make serviceName human-readable.
	{
	regType = serviceName + ( regType.startsWith( "_udp.") ? "._udp." : "._tcp.");
	super.serviceFound( browser, flags, ifIndex, this.mapTypeToName( serviceName), regType, domain);
	}

	public void serviceLost( DNSSDService browser, int flags, int ifIndex,
	String serviceName, String regType, String domain)
	// Overridden to make serviceName human-readable.
	{
	super.serviceLost( browser, flags, ifIndex, this.mapTypeToName( serviceName), regType, domain);
	}

	protected String mapTypeToName( String type)
	// Convert a registration type into a human-readable string. Returns original string on no-match.
	{
	final String[] namedServices = {
	"_afpovertcp", "Apple File Sharing",
	"_http", "World Wide Web servers",
	"_daap", "Digital Audio Access",
	"_apple-sasl", "Apple Password Servers",
	"_distcc", "Distributed Compiler nodes",
	"_finger", "Finger servers",
	"_ichat", "iChat clients",
	"_presence", "iChat AV clients",
	"_ssh", "SSH servers",
	"_telnet", "Telnet servers",
	"_workstation", "Macintosh Manager clients",
	"_bootps", "BootP servers",
	"_xserveraid", "XServe RAID devices",
	"_eppc", "Remote AppleEvents",
	"_ftp", "FTP services",
	"_tftp", "TFTP services"
	};

	for ( int i = 0; i < namedServices.length; i+=2)
	if ( namedServices[i].equals( type))
	return namedServices[i + 1];
	return type;
	}
	}


	class DomainListModel extends DefaultListModel implements DomainListener
	{
	/* Called when a domain is discovered. */
	public void domainFound( DNSSDService domainEnum, int flags, int ifIndex, String domain)
	{
	if ( !this.contains( domain))
	this.addElement( domain);
	}

	public void domainLost( DNSSDService domainEnum, int flags, int ifIndex, String domain)
	{
	if ( this.contains( domain))
	this.removeElement( domain);
	}

	public void operationFailed( DNSSDService service, int errorCode)
	{
	// handle failure here
	}
	}