/*
** Luxor - XML User Interface Language (XUL) Toolkit
** Copyright (c) 2001, 2002 by Gerald Bauer
**
** This program is free software.
**
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE.
**
*/

package luxor.online;

import javax.swing.event.*;
import luxor.event.*;

public class OnlineManager
{

   String _documentBase;
   private static OnlineManager _instance;

   private boolean _is_online = true;

   private EventListenerList _listener = new EventListenerList();

   private OnlineManager() { }

   public void setDocumentBase( String documentBase )
   {
      _documentBase = documentBase;
   }

   public static OnlineManager getOnlineManager()
   {
      if( _instance == null )
         _instance = new OnlineManager();

      return _instance;
   }

   public String getDocumentBase()
   {
      return _documentBase;
   }

   public boolean isOffline()
   {
      return _is_online != true;
   }

   public boolean isOnline()
   {
      return _is_online == true;
   }

   public void addOnlineListener( OnlineListener l )
   {
      _listener.add( OnlineListener.class, l );
   }

   public void goOffline()
   {
      if( isOffline() )
         return;

      _is_online = false;
      fireChangedToOffline();
   }

   public void goOnline()
   {
      if( isOnline() )
         return;

      _is_online = true;
      fireChangedToOnline();
   }

   public void removeOnlineListener( OnlineListener l )
   {
      _listener.remove( OnlineListener.class, l );
   }

   public void toggleOnline()
   {
      if( isOnline() )
         goOffline();
      else
         goOnline();
   }

   protected void fireChangedToOffline()
   {
      OnlineListener l[] = ( OnlineListener[] ) _listener.getListeners( OnlineListener.class );
      for( int i = 0; i < l.length; i++ )
         l[i].changedToOffline();
   }

   protected void fireChangedToOnline()
   {
      OnlineListener l[] = ( OnlineListener[] ) _listener.getListeners( OnlineListener.class );
      for( int i = 0; i < l.length; i++ )
         l[i].changedToOnline();
   }

}