pseauthenticatorenginefactory.java

jxta平台的开发包

/************************************************************************
 *
 * $Id: PSEAuthenticatorEngineFactory.java,v 1.1 2005/12/06 19:23:33 bondolo Exp $
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *********************************************************************************/

package net.jxta.impl.membership.pse;

import net.jxta.document.Advertisement;
import net.jxta.id.ID;
import net.jxta.peergroup.PeerGroup;
import net.jxta.exception.PeerGroupException;
import net.jxta.impl.protocol.PSEConfigAdv;

/**
 *
 * @author nick
 */
public abstract class PSEAuthenticatorEngineFactory {
    
    private static PSEAuthenticatorEngineFactory defaultEngine = null;
    
    public static void setPSESecurityEngineFactory(PSEAuthenticatorEngineFactory newEngine) {
        synchronized( PSEAuthenticatorEngineFactory.class ) {
            defaultEngine = newEngine;
        }
    }
    
    /**
    *   Returns the default Authenticator Engine.
    *
    *   @return The current default Authenticator Engine.
    **/
    public static PSEAuthenticatorEngineFactory getDefault() {
        synchronized( PSEAuthenticatorEngineFactory.class ) {
            if (defaultEngine == null) {
                defaultEngine = new PSEAuthenticatorEngineDefaultFactory();
            }
            
            return defaultEngine;
        }
    }
    
    /**
    *   Creates a new Authenticator Engine instance based upon the context and configuration.
    *
    *   @param service  The service that this keystore manager will be working for.
    *   @param config   The configuration parameters.
    **/
    public abstract PSEAuthenticatorEngine getInstance(PSEMembershipService service, PSEConfigAdv config) throws PeerGroupException;
    
    /**
    *   Default implementation which provides the default behaviour (which is to do nothing).
    **/
    private static class PSEAuthenticatorEngineDefaultFactory extends PSEAuthenticatorEngineFactory {

        public PSEAuthenticatorEngine getInstance(PSEMembershipService service, PSEConfigAdv config) throws PeerGroupException {
            return null;
        }
    }
}