peergroupid.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/*
 * 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.
 *
 * $Id: PeerGroupID.java,v 1.2 2002/03/04 20:19:20 echtcherbina Exp $
 */
package net.jxta.peergroup;

import java.net.URL;

import java.net.UnknownServiceException;
import java.net.MalformedURLException;
import java.lang.IllegalStateException;

import net.jxta.id.ID;
import net.jxta.id.IDFactory;

/**
 *  This class implements a PeerGroup ID. Each peer group is assigned a
 *  unique id.
 *
 *  @see         net.jxta.id.ID
 *  @see         net.jxta.id.IDFactory
 *  @see         net.jxta.peer.PeerID
 *
 * @since JXTA 1.0
 */
public abstract class PeerGroupID extends ID {
    
    /**
     * The well known Unique Identifier of the world peergroup.
     * This is a singleton within the scope of a VM.
     *
     * @since JXTA 1.0
     **/
    final static public PeerGroupID worldPeerGroupID = new WorldPeerGroupID();

    /**
     * The well known Unique Identifier of the net peergroup.
     * This is a singleton within the scope of this VM.
     *
     * @since JXTA 1.0
     **/
    final static public PeerGroupID defaultNetPeerGroupID = new NetPeerGroupID();
}

class WorldPeerGroupID extends PeerGroupID {
        
    /**
     * The name associated with this ID Format.
     */
    final static  String JXTAFormat = "jxta";
    
    private static final String UNIQUEVALUE = "WorldGroup";
    
    public Object clone() {
        return this;  // worldPeerGroupID is only itself.
    }
    
    public boolean equals( Object target ) {
        return (this == target);   // worldPeerGroupID is only itself.
    }
    
    /**
     * deserialization has to point back to the singleton in this VM
     */
    private Object readResolve() {
        return this;
    }
    
    public URL getURL() {
        String urlText = URNNamespace + ":" + getUniqueValue();
        
        try {
            return new URL( URIEncodingName, "", urlText );
        }
        catch( MalformedURLException caught ) {
            throw new IllegalStateException( "Environment incorrectly intialized." );
        }
    }
    
    public String getIDFormat() {
        return JXTAFormat;
    }
    
    public Object getUniqueValue() {
        return getIDFormat() + "-" + UNIQUEVALUE;
    }
}

class NetPeerGroupID extends PeerGroupID {
    /**
     * The name associated with this ID Format.
     */
    final static  String JXTAFormat = "jxta";
    
    private static final String UNIQUEVALUE = "NetGroup";
    
    public Object clone() {
        return this;  // netPeerGroupID is only itself.
    }
    
    public boolean equals( Object target ) {
        return (this == target);   // netPeerGroupID is only itself.
    }
    
    /**
     * deserialization has to point back to the singleton in this VM
     */
    private Object readResolve() {
        return this;
    }
    
    public URL getURL() {
        String urlText = URNNamespace + ":" + getUniqueValue();
        
        try {
            return new URL( URIEncodingName, "", urlText );
        }
        catch( MalformedURLException caught ) {
            throw new IllegalStateException( "Environment incorrectly intialized." );
        }
    }
    
    public String getIDFormat() {
        return JXTAFormat;
    }
    
    public Object getUniqueValue() {
        return getIDFormat() + "-" + UNIQUEVALUE;
    }
}