newpipe.java

有关java 的p2p应用,是一般很好的教程,有兴趣的朋友应该好好阅读一下

/*
 * 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: newpipe.java,v 1.3 2004/05/27 20:26:44 bondolo Exp $
 */

package net.jxta.impl.shell.bin.newpipe;


import java.util.*;
import java.net.*;

import java.lang.reflect.InvocationTargetException;

import net.jxta.discovery.*;
import net.jxta.document.*;
import net.jxta.exception.*;
import net.jxta.id.ID;
import net.jxta.id.IDFactory;
import net.jxta.peergroup.*;
import net.jxta.pipe.*;
import net.jxta.protocol.*;

import net.jxta.impl.shell.GetOpt;
import net.jxta.impl.shell.ShellApp;
import net.jxta.impl.shell.ShellEnv;
import net.jxta.impl.shell.ShellObject;

/**
 * mkgrp command creates a peer group object for a new group or from an adv
 */
public class newpipe extends ShellApp {
    
    private ShellEnv env;
    private String name = null;
    private PipeAdvertisement adv = null;
    private ShellObject obj = null;
    
    public newpipe() {
    }
    
    public int startApp( String[] argv ) {
        boolean secure = false;
        boolean propagate = false;
        
        env = getEnv();
        
        GetOpt options = new GetOpt( argv, 0, "n:sp" );
        
        while( true ) {
            int option;
            try {
                option = options.getNextOption();
            } catch( IllegalArgumentException badopt ) {
                consoleMessage( "Illegal argument :" + badopt );
                return syntaxError();
            }
                        
            if( -1 == option ) {
                break;
            }
            
            switch( option ) {
                case 'n' :
                    name = options.getOptionArg();
                    break;
                    
                case 'p' :
                    propagate = true;
                    break;
                    
                case 's' :
                    secure = true;
                    break;
                default :
                    consoleMessage( "Unrecognized option" );
                    return syntaxError();
            }
        }
        
        if ( null != options.getNextParameter() ) {
            consoleMessage( "Unsupported parameter" );
            return syntaxError();
        }
        
        if( propagate && secure ) {
            consoleMessage( "secure or propagate, but not both allowed" );
            return syntaxError();
        }
        
        try {
            PeerGroup parent = (PeerGroup) env.get("stdgroup").getObject();

            adv = (PipeAdvertisement)
            AdvertisementFactory.newAdvertisement(
            PipeAdvertisement.getAdvertisementType() );
            
            adv.setPipeID( IDFactory.newPipeID( parent.getPeerGroupID() ) );
            adv.setName(name);
            //            adv.setDescription("created by newpipe");
            
            String pipeType = PipeService.UnicastType;
            
            if( secure ) {
                pipeType = PipeService.UnicastSecureType;
            }
            
            if( propagate ) {
                pipeType = PipeService.PropagateType;
            }
            
            adv.setType( pipeType );
            
            ShellObject newAdv = new ShellObject("Pipe Advertisement", adv);
            env.add( getReturnVariable(), newAdv );
            
            return ShellApp.appNoError;
        } catch ( Throwable all ) {
            printStackTrace( "Failure creating pipe advertisment", all );
            return ShellApp.appMiscError;
        }
    }
    
    public void stopApp() {
    }
    
    public int syntaxError() {
        consoleMessage( "Usage: newpipe <name>");
        return ShellApp.appParamError;
    }
    
    public String getDescription() {
        return "Create a new pipe advertisment ";
    }
    
    public void help() {
        println("NAME");
        println("     newpipe - " + getDescription() );
        println(" ");
        println("SYNOPSIS");
        println(" ");
        println("     newpipe [-p | -s] [-n <name>]");
        println(" ");
        println("OPTIONS");
        println(" ");
        println("      [-s]             Use a secure pipe.");
        println("      [-p]             Use a propagate pipe.");
        println("      [-n <name>]      Optional name for the pipe");
        println(" ");
        println("DESCRIPTION");
        println(" ");
        println("newpipe creates a new pipe advertisement with a random pipe id. " );
        println(" ");
        println("EXAMPLE");
        println(" ");
        println("          JXTA>mypipeadv = newpipe -n mypipe");
        println(" ");
        println(" This creates a new pipe advertisement of the default type. The new ");
        println(" pipe is given the name 'mypipe'. Before you can do anything with");
        println(" the pipe you need to instantiate it via the 'mkpipe' command.");
        println(" ");
        println("SEE ALSO");
        println("    mkpipe");
    }
}