code: /***************************************************************************
   *   Copyright (C) 2010 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.soap;
  
  import java.util.HashMap;
  import java.util.Map;
  import javax.wsdl.Definition;
  import javax.wsdl.WSDLException;
  import javax.wsdl.factory.WSDLFactory;
  import javax.wsdl.xml.WSDLReader;
  
  /**
   * Implements a WSDL document cache for the SOAP protocol.
   *
   * @author Fabrizio Montesi
   * TODO: WSDL document removal after some time
   */
  public class WSDLCache
  {
  	private static WSDLCache instance = null;
  
  	private final Map< String, Definition > cache;
  	private final WSDLFactory factory;
  
  	private WSDLCache()
  		throws WSDLException
  	{
  		cache = new HashMap< String, Definition >();
  		factory = WSDLFactory.newInstance();
  	}
  
  	public static synchronized WSDLCache getInstance()
  		throws WSDLException
  	{
  		if ( instance == null ) {
  			instance = new WSDLCache();
  		}
  		return instance;
  	}
  
  	public synchronized Definition get( String url )
  		throws WSDLException
  	{
  		Definition definition = cache.get( url );
  		if ( definition == null ) {
  			WSDLReader reader = factory.newWSDLReader();
  			reader.setFeature( "javax.wsdl.verbose", false );
  			definition = reader.readWSDL( url );
  			cache.put( url, definition );
  		}
  		return definition;
  	}
  }
  