discoveryresponse.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: DiscoveryResponse.java,v 1.24 2002/04/22 22:05:07 hamada Exp $
 */

package net.jxta.impl.protocol;

import java.io.InputStream;
import java.io.StringWriter;
import java.util.Enumeration;
import java.util.Vector;

import java.io.IOException;

import net.jxta.document.*;
import net.jxta.protocol.*;
import net.jxta.impl.document.LiteXMLElement;
import net.jxta.resolver.*;
import net.jxta.discovery.DiscoveryService;

import org.apache.log4j.Category; import org.apache.log4j.Priority;

/**
 * DiscoveryResponse
 *
 * @since 1.0
 */
public class DiscoveryResponse extends DiscoveryResponseMsg {

    private static final String      countTag = "Count";
    private static final String       typeTag = "Type";
    private static final String    peerAdvTag = "PeerAdv";
    private static final String  responsesTag = "Response";
    private static final String expirationTag = "Expiration";
    private static final String  queryAttrTag = "Attr";
    private static final String queryValueTag = "Value";

    private static final Category LOG =
        Category.getInstance(DiscoveryResponse.class.getName());

    /**
     * Construct a doc from InputStream
     *
     */
    public DiscoveryResponse( InputStream stream ) throws IOException {

            // We are asked to assume that the message from which this response
            //is constructed is an XML document.
            StructuredTextDocument doc = (StructuredTextDocument)
            StructuredDocumentFactory.newStructuredDocument(
            new MimeMediaType( "text", "xml"), stream );
            readIt( doc );
    }

    /**
     * Construct from a StructuredDocument
     *
     */

    public DiscoveryResponse( TextElement doc ) {

        if( !getAdvertisementType().equals( doc.getName() ) ) {
            throw new IllegalArgumentException( "Could not construct : " +
            getClass().getName() + " from doc containing a " +
            doc.getName() );
        }

        readIt( doc );
    }

    public void readIt( TextElement doc ) {
        Vector res  = new Vector();
        Vector exps = new Vector ();
        long exp;

        try {
        res.removeAllElements();
        Enumeration elements = doc.getChildren();
        while (elements.hasMoreElements()) {
            TextElement elem = (TextElement) elements.nextElement();
            if( elem.getName().equals(countTag)) {
                count=Integer.parseInt( elem.getTextValue() );
                continue;
            }
            if( elem.getName().equals(typeTag)) {
                type=Integer.parseInt( elem.getTextValue() );
                continue;
            }

            if( elem.getName().equals(peerAdvTag)) {
                setPeerAdv( elem.getTextValue() );
                continue;
            }

            if( elem.getName().equals(queryAttrTag)) {
                setQueryAttr( elem.getTextValue() );
                continue;
            }

            if( elem.getName().equals(queryValueTag)) {
                setQueryValue( elem.getTextValue() );
                continue;
            }

            if( elem.getName().equals(responsesTag)) {
                // get the response
                res.addElement(elem.getValue());
                // get expiration associated with this response
                Attribute attr = ((Attributable)elem).getAttribute(expirationTag);
                // if there are no attribute use DEFAULT_EXPIRATION
                if ( null == attr) {
                 exps.addElement (new Long (DiscoveryService.DEFAULT_EXPIRATION));
                 continue;
                }

                String expstr =   attr.getValue();
                if ( null != expstr ) {
                 exp = Long.parseLong (expstr);
                } else {
                 // deal with old style response
                 // <responses>...adv...</responses>
                 if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug ("Received an old-style DiscoveryResponse.\n " +
                  "You received a response from a peer that does \n" +
                  "not support advertisement aging. \n" +
                  "Setting expiration to DiscoveryService.DEFAULT_EXPIRATION ");
                 exp = DiscoveryService.DEFAULT_EXPIRATION;
                }
                exps.addElement (new Long (exp));
            }
        }

        } catch (Exception mye) {
          if (LOG.isDebugEnabled ()) if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("Got an Exception during Parse ",mye);
        }

        setResponses(res);
        setExpirations (exps);
    }

    /**
     * Construct a doc from strings
     *
     */

    public DiscoveryResponse(int count,
                             int type,
                             String peeradv,
                             String attr,
                             String value,
                             Vector responses,
                             Vector expirations)
    {
        if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug ("DiscoveryResponse.<init>:  response count = " 
            + responses.size () );
        setResponseCount(count);
        setDiscoveryType(type);
        setPeerAdv(peeradv);
        setQueryAttr(attr);
        setQueryValue(value);
        setResponses(responses);
        setExpirations(expirations);
    }


    /**
     *  return a Document represetation of this object
     */

    public Document getDocument( MimeMediaType asMimeType ) {

        StructuredTextDocument adv = (StructuredTextDocument)
        StructuredDocumentFactory.newStructuredDocument( asMimeType,
                                     getAdvertisementType() );
        Element e;

        e = adv.createElement(countTag, Integer.toString(count));
        adv.appendChild(e);
        e = adv.createElement(typeTag, Integer.toString(type));
        adv.appendChild(e);
        e = adv.createElement(peerAdvTag, getPeerAdv());
        adv.appendChild(e);
        e = adv.createElement(queryAttrTag, getQueryAttr());
        adv.appendChild(e);
        e = adv.createElement(queryValueTag, getQueryValue());
        adv.appendChild(e);

        Enumeration advs = getResponses();
            Enumeration exps = getExpirations();

        try {
            while (advs.hasMoreElements ()) {

             Long   l = (Long)  exps.nextElement ();
             e = adv.createElement(responsesTag,(String) advs.nextElement());
             adv.appendChild (e);
             ((Attributable)e).addAttribute(expirationTag,l.toString ());
            }


    } catch (Exception ex){

      if (LOG.isDebugEnabled ()) if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("Got an Exception during doc creation ",ex);

    }

     return adv;
    }

    /**
     * return the string representaion of this doc
     *
     */

    public String toString() {
        try {
            StringWriter    out = new StringWriter();
            StructuredTextDocument doc = (StructuredTextDocument)
            getDocument( new MimeMediaType("text/xml") );
            doc.sendToWriter( out );

            // if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug ("toString: " + out.toString ());
            return out.toString();
        }
        catch( Exception e ) {
        if (LOG.isDebugEnabled ()) if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("Got an Exception during Parse ",e);
        }
        return null;
    }
}