servicemanager.java

JDesktop Integration Components （JDIC）

/*
 * Copyright (C) 2004 Sun Microsystems, Inc. All rights reserved. Use is
 * subject to license terms.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the Lesser GNU 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 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.
 */ 
 
package org.jdesktop.jdic.desktop.internal;

import java.util.logging.Level;
import java.util.logging.Logger;
import org.jdesktop.jdic.init.JdicInitException;
import org.jdesktop.jdic.init.JdicManager;


/**
 * The <code>ServiceManager</code> class provides static fields to refer to 
 * the available services, and static methods to get the approprate service 
 * objects with the given service name. This class is abstract and final and 
 * cannot be instantiated.
 * 
 * @see     ServiceManagerStub
 * @see     LaunchService
 * @see     BrowserService
 * @see     MailerService
 */
public class ServiceManager {
  
    /**
     * Constant name for looking up the launch service object.
     */
    public static final String LAUNCH_SERVICE = "LaunchService";
  
    /**
     * Constant name for looking up the browser service object.
     */
    public static final String BROWSER_SERVICE = "BrowserService";
  
    /**
     * Constant name for looking up the mailer service object.
     */
    public static final String MAILER_SERVICE = "MailerService";
  
    /**
     * Suppress default constructor for noninstantiability.
     */
    private ServiceManager() {}
    
    static java.lang.reflect.Method mdServiceManagerStub_getService = null;
   
    /**
     * Gets a service object with the given name. The given service name should be one 
     * of the pre-defined service names.
     * 
     * @param  serviceName the given service name.
     * @return the appropriate service object.
     * @throws NullPointerException if the given service name is null.
     * @see    LaunchService 
     * @see    BrowserService 
     * @see    MailerService
     */
    public static Object getService(String serviceName) 
        throws NullPointerException {
        if (serviceName == null) { 
            throw new NullPointerException("Service name is null.");
        }
        //return ServiceManagerStub.getService(serviceName);    
        //works really dynamic now
        try {        
            if(null==mdServiceManagerStub_getService){
                mdServiceManagerStub_getService = ClassLoader
                        .getSystemClassLoader()
                        .loadClass("org.jdesktop.jdic.desktop.internal.impl.ServiceManagerStub_" 
                            + JdicManager.getPlatformSuffix() )
                        .getMethod("getService", new Class[]{String.class});
            } 
            return mdServiceManagerStub_getService.invoke(
                    null, //static method
                    new Object[] { serviceName });
        }catch( Exception e ){
            e.printStackTrace();
        }
        return null;
    }
}