code: /***************************************************************************
   *   Copyright (C) 2008-2009 by Fabrizio Montesi <famontesi@gmail.com>     *
   *                                                                         *
   *   This program is free software; you can redistribute it and/or modify  *
   *   it under the terms of the GNU Library General Public License as       *
   *   published by the Free Software Foundation; either version 2 of the    *
   *   License, or (at your option) any later version.                       *
   *                                                                         *
   *   This program is distributed in the hope that it will be useful,       *
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
   *   GNU General Public License for more details.                          *
   *                                                                         *
   *   You should have received a copy of the GNU Library General Public     *
   *   License along with this program; if not, write to the                 *
   *   Free Software Foundation, Inc.,                                       *
   *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
   *                                                                         *
   *   For details about the authors of this software, see the AUTHORS file. *
   ***************************************************************************/
  package jolie.net;
  
  import jolie.net.ports.OutputPort;
  import java.io.IOException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.util.HashMap;
  import java.util.Map;
  import javax.bluetooth.BTL2CapHelper;
  import javax.bluetooth.L2CAPConnection;
  import javax.bluetooth.ServiceRecord;
  import javax.microedition.io.Connector;
  import jolie.net.ext.CommChannelFactory;
  import jolie.runtime.AndJarDeps;
  
  @AndJarDeps({"bluetooth.jar"})
  public class BTL2CapChannelFactory extends CommChannelFactory
  {
  	private final static int cacheLimit = 1000; // Must be > 0
  	private final Map< String, Map< String, ServiceRecord > > serviceCache =
  						new HashMap< String, Map< String, ServiceRecord > > ();
  
  	public BTL2CapChannelFactory( CommCore commCore )
  	{
  		super( commCore );
  	}
  
  	public ServiceRecord getFromServiceCache( String btAddr, String uuidStr )
  	{
  		ServiceRecord r = null;
  		try {
  			r = serviceCache.get( btAddr ).get( uuidStr );
  		} catch( NullPointerException e ) {}
  		return r;
  	}
  	
  	public void putInServiceCache( String btAddr, String uuidStr, ServiceRecord record )
  	{
  		if ( serviceCache.size() > cacheLimit ) {
  			serviceCache.remove( serviceCache.keySet().iterator().next() );
  		}
  		Map< String, ServiceRecord > map = serviceCache.get( btAddr );
  		if ( map == null ) {
  			map = new HashMap< String, ServiceRecord > ();
  			serviceCache.put( btAddr, map );
  		}
  		if ( map.size() > cacheLimit ) {
  			map.remove( map.keySet().iterator().next() );
  		}
  		map.put( uuidStr, record);
  	}
  	
  	public CommChannel createChannel( URI uri, OutputPort port )
  		throws IOException
  	{
  		if ( uri.getHost() != null && uri.getHost().equals( "localhost" ) ) {
  			throw new IOException( "Malformed output btl2cap location: " + uri.toString() );
  		}
  		try {
  			String connectionURL = BTL2CapHelper.getConnectionURL( uri, this );
  			L2CAPConnection conn = (L2CAPConnection)Connector.open( connectionURL );
  			return new BTL2CapCommChannel( conn, uri, port.getProtocol() );
  		} catch( ClassCastException e ) {
  			throw new IOException( "CastException: malformed output btl2cap location: " + uri.toString() );
  		} catch( URISyntaxException e ) {
  			throw new IOException( e );
  		} catch( NullPointerException e ) {
  			throw new IOException( e );
  		} 
  	}
  }
  