rdvadv.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 * $Id: RdvAdv.java,v 1.23 2005/08/31 20:46:44 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.protocol;


import java.net.URI;
import java.util.Enumeration;

import java.net.URISyntaxException;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

import net.jxta.document.Advertisement;
import net.jxta.document.AdvertisementFactory;
import net.jxta.document.Attribute;
import net.jxta.document.Document;
import net.jxta.document.Element;
import net.jxta.document.MimeMediaType;
import net.jxta.document.StructuredDocumentUtils;
import net.jxta.document.StructuredDocument;
import net.jxta.document.StructuredTextDocument;
import net.jxta.document.XMLElement;
import net.jxta.id.IDFactory;
import net.jxta.peer.PeerID;
import net.jxta.peergroup.PeerGroupID;
import net.jxta.protocol.RdvAdvertisement;
import net.jxta.protocol.RouteAdvertisement;


/**
 * This class implements the RdvAdvertisement.
 *
 * <p/><pre>
 *   &lt;xs:complexType name="RdvAdvertisement">
 *     &lt;xs:sequence>
 *       &lt;xs:element name="RdvGroupId" type="jxta:JXTAID"/>
 *       &lt;xs:element name="RdvPeerId" type="jxta:JXTAID"/>
 *       &lt;xs:element name="RdvServiceName" type="xs:string"/>
 *       &lt;xs:element name="Name" type="xs:string" minOccurs="0"/>
 *       &lt;!-- This should be a route -->
 *       &lt;xs:element name="RdvRoute" type="xs:anyType" minOccurs="0"/>
 *     &lt;/xs:sequence>
 *   &lt;/xs:complexType>
 * </pre>
 **/
public class RdvAdv extends RdvAdvertisement {
    
    /**
     *  Log4J Logger
     **/
    private final static transient Logger LOG = Logger.getLogger(RdvAdv.class.getName());   
    
    private static final String[] INDEX_FIELDS = { PeerIDTag, ServiceNameTag, GroupIDTag };
    
    /**
     * Instantiator for our advertisement
     **/
    public static class Instantiator implements AdvertisementFactory.Instantiator {
        
        /**
         * {@inheritDoc}
         **/
        public String getAdvertisementType() {
            return RdvAdv.getAdvertisementType();
        }
        
        /**
         * {@inheritDoc}
         **/
        public Advertisement newInstance() {
            return new RdvAdv();
        }
        
        /**
         * {@inheritDoc}
         **/
        public Advertisement newInstance(Element root) {
            return new RdvAdv(root);
        }
    }
    
    /**
     *  Constructor for new advertisements. Use Instantiator
     **/
    private RdvAdv() {}
    
    /**
     *  Constructor for existing advertisements. Use Instantiator
     **/
    private RdvAdv(Element root) {
        if (!XMLElement.class.isInstance(root)) {
            throw new IllegalArgumentException(getClass().getName() + " only supports XLMElement");
        }
        
        XMLElement doc = (XMLElement) root;
        
        String doctype = doc.getName();
        
        String typedoctype = "";
        Attribute itsType = doc.getAttribute("type");

        if (null != itsType) {
            typedoctype = itsType.getValue();
        }
        
        if (!doctype.equals(getAdvertisementType()) && !getAdvertisementType().equals(typedoctype)) {
            throw new IllegalArgumentException("Could not construct : " + getClass().getName() + "from doc containing a " + doc.getName());
        }
        
        Enumeration elements = doc.getChildren();
        
        while (elements.hasMoreElements()) {
            XMLElement elem = (XMLElement) elements.nextElement();
            
            if (!handleElement(elem)) {
                if (LOG.isEnabledFor(Level.DEBUG)) {
                    LOG.debug("Unhandled Element: " + elem.toString());
                }
            }
        }
        
        // Sanity Check!!!
        if (null == getGroupID()) {
            throw new IllegalArgumentException("Missing peer group ID");
        }
        
        if (null == getPeerID()) {
            throw new IllegalArgumentException("Missing peer ID");
        }
        
        if (null == getServiceName()) {
            throw new IllegalArgumentException("Missing service name");
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    protected boolean handleElement(Element raw) {
        
        if (super.handleElement(raw)) {
            return true;
        }
        
        XMLElement elem = (XMLElement) raw;
        
        if (elem.getName().equals(RdvAdvertisement.GroupIDTag)) {
            try {
                URI groupID = new URI(elem.getTextValue().trim());

                setGroupID((PeerGroupID) IDFactory.fromURI(groupID));
            } catch (URISyntaxException badID) {
                throw new IllegalArgumentException("Bad group ID in advertisement");
            } catch (ClassCastException badID) {
                throw new IllegalArgumentException("ID is not a group ID");
            }
            return true;
        }
        
        if (elem.getName().equals(RdvAdvertisement.PeerIDTag)) {
            try {
                URI peerID = new URI(elem.getTextValue().trim());

                setPeerID((PeerID) IDFactory.fromURI(peerID));
            } catch (URISyntaxException badID) {
                throw new IllegalArgumentException("Bad group ID in advertisement");
            } catch (ClassCastException badID) {
                throw new IllegalArgumentException("ID is not a group ID");
            }
            return true;
        }
        
        if (elem.getName().equals(RdvAdvertisement.ServiceNameTag)) {
            setServiceName(elem.getTextValue());
            return true;
        }
        
        if (elem.getName().equals(RdvAdvertisement.RouteTag)) {
            for (Enumeration eachXpt = elem.getChildren(); eachXpt.hasMoreElements();) {
                
                XMLElement aXpt = (XMLElement) eachXpt.nextElement();
                
                RouteAdvertisement xptAdv = (RouteAdvertisement)
                        AdvertisementFactory.newAdvertisement(aXpt);

                setRouteAdv(xptAdv);
            }
            return true;
        }
        
        if (elem.getName().equals(RdvAdvertisement.NameTag)) {
            setName(elem.getTextValue());
            return true;
        }
        
        return false;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public Document getDocument(MimeMediaType encodeAs) {
        
        // Sanity Check!!!
        if (null == getGroupID()) {
            throw new IllegalStateException("Missing peer group ID");
        }
        
        if (null == getPeerID()) {
            throw new IllegalStateException("Missing peer ID");
        }
        
        if (null == getServiceName()) {
            throw new IllegalStateException("Missing service name");
        }

        StructuredDocument adv = (StructuredDocument) super.getDocument(encodeAs);
        
        Element e = adv.createElement(RdvAdvertisement.GroupIDTag, getGroupID().toString());

        adv.appendChild(e);
        
        e = adv.createElement(RdvAdvertisement.PeerIDTag, getPeerID().toString());
        adv.appendChild(e);
        
        e = adv.createElement(RdvAdvertisement.ServiceNameTag, getServiceName());
        adv.appendChild(e);
        
        String peerName = getName();

        if (null != peerName) {
            e = adv.createElement(RdvAdvertisement.NameTag, getName());
            adv.appendChild(e);
        }
        
        if (getRouteAdv() != null) {
            Element el = adv.createElement(RdvAdvertisement.RouteTag);

            adv.appendChild(el);
            
            StructuredTextDocument xptDoc = (StructuredTextDocument)
                    getRouteAdv().getDocument(encodeAs);

            StructuredDocumentUtils.copyElements(adv, el, xptDoc);
        }
        
        return adv;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public String[] getIndexFields() {
        return INDEX_FIELDS;
    }
}