pipeutil.java

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/*
*  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 discalimer 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 THE APACHE SOFTWARE FOUNDATION 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: PipeUtil.java,v 1.4 2007/05/02 21:39:08 nano Exp $
*/

package net.jxta.myjxta.util;

import net.jxta.discovery.DiscoveryListener;
import net.jxta.discovery.DiscoveryService;
import net.jxta.document.AdvertisementFactory;
import net.jxta.id.IDFactory;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.PipeAdvertisement;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

/**
 * @author james todd [gonzo at jxta dot org]
 * @version $Id: PipeUtil.java,v 1.4 2007/05/02 21:39:08 nano Exp $
 */

public class PipeUtil {

//    private static final Object LOCK = new Object();

    public static final byte[] GROUP_CHAT_PIPE_ID = {
            (byte) 0xD1, (byte) 0xD1, (byte) 0xD1, (byte) 0xD1,
            (byte) 0xD1, (byte) 0xD1, (byte) 0xD1, (byte) 0xD1,
            (byte) 0xD1, (byte) 0xD1, (byte) 0xD1, (byte) 0xD1,
            (byte) 0xD1, (byte) 0xD1, (byte) 0xD1, (byte) 0xD1
    };

    public static PipeAdvertisement getAdv(PeerGroup pg, String name,
                                           String type, byte[] pipeId) {
        PipeAdvertisement pa = searchLocal(pg, name);

        if (pa == null) {
            pa = createAdv(pg, name, type, pipeId);

            publish(pg, pa);
        }

        return pa;
    }

    public static List<PipeAdvertisement> getAdvs(PeerGroup pg, String name) {
        List<PipeAdvertisement> p = new ArrayList<PipeAdvertisement>();

        Enumeration pas;
        try {
            pas = pg.getDiscoveryService().
                    getLocalAdvertisements(DiscoveryService.ADV,
                            PipeAdvertisement.NameTag, name);
        } catch (IOException ioe) {
            ioe.printStackTrace();
            return new ArrayList<PipeAdvertisement>();
        }

        while (pas.hasMoreElements()) {
            Object o = pas.nextElement();
            if (o instanceof PipeAdvertisement) {
                p.add((PipeAdvertisement) o);
            }
        }

        return p;
    }

    public static PipeAdvertisement searchLocal(PeerGroup pg, String name) {


        DiscoveryService discoveryService = pg.getDiscoveryService();
        Enumeration pas;
        try {
            pas = discoveryService.getLocalAdvertisements(DiscoveryService.ADV, PipeAdvertisement.NameTag, name);
        } catch (IOException e) {
            return null;
        }
        PipeAdvertisement pa;
        while (pas.hasMoreElements()) {
            pa = (PipeAdvertisement) pas.nextElement();

            if (pa.getName().equals(name)) {
                return pa;
            }
        }
        return null;
    }

    public static void discoverAdvs(PeerGroup pg, String name,
                                    DiscoveryListener listener) {
        DiscoveryService s = pg.getDiscoveryService();

        s.getRemoteAdvertisements(null, DiscoveryService.ADV,
                name != null ? PipeAdvertisement.NameTag : null,
                name, 10, listener);
    }

    public static PipeAdvertisement createAdv(PeerGroup pg, String name,
                                              String type) {
        return createAdv(pg, name, type, null);
    }

    public static PipeAdvertisement createAdv(PeerGroup pg, String name,
                                              String type, byte[] id) {
        PipeAdvertisement pa = (PipeAdvertisement) AdvertisementFactory.
                newAdvertisement(PipeAdvertisement.getAdvertisementType());

        pa.setPipeID(id != null ?
                IDFactory.newPipeID(pg.getPeerGroupID(), id) :
                IDFactory.newPipeID(pg.getPeerGroupID()));
        pa.setName(name);
        pa.setType(type);

        return pa;
    }



    public static void publish(PeerGroup pg, PipeAdvertisement pa ) {
        DiscoveryService ds = pg.getDiscoveryService();

        try {
            ds.publish(pa);
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}