discoveryquery.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: DiscoveryQuery.java,v 1.19 2002/04/25 17:54:31 bondolo Exp $
 */

package net.jxta.impl.protocol;

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

import java.io.IOException;

import net.jxta.document.*;
import net.jxta.protocol.*;
import net.jxta.resolver.*;


/**
 * DiscoveryQuery
 *
 * @since 1.0
 */
public class DiscoveryQuery extends DiscoveryQueryMsg {
    
    private static final String typeTag = "Type";
    private static final String peerAdvTag = "PeerAdv";
    private static final String thresholdTag = "Threshold";
    private static final String queryAttrTag = "Attr";
    private static final String queryValueTag = "Value";
    /**
     * Construct a doc from InputStream
     *
     */
    
    public DiscoveryQuery( 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 DiscoveryQuery( 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 ) {
        
        Enumeration elements = doc.getChildren();
        while (elements.hasMoreElements()) {
            TextElement elem = (TextElement) elements.nextElement();
            if( elem.getName().equals(typeTag)) {
                setDiscoveryType( Integer.parseInt( elem.getTextValue() ) );
                continue;
            }
            
            if( elem.getName().equals(thresholdTag)) {
                setThreshold(Integer.parseInt( elem.getTextValue() ));
                continue;
            }
            
            if( elem.getName().equals(peerAdvTag)) {
                setPeerAdv( elem.getTextValue() );
                continue;
            }
            
            if( elem.getName().equals(queryAttrTag )) {
                setAttr( elem.getTextValue() );
                continue;
            }
            if( elem.getName().equals(queryValueTag )) {
                setValue( elem.getTextValue() );
                continue;
            }
        }
    }
    
    /**
     * Construct a doc from strings
     *
     */
    
    public DiscoveryQuery(int type, String peeradv,
    String attr, String value, int threshold) {
        
        setDiscoveryType(type);
        setThreshold(threshold);
        setPeerAdv(peeradv);
        setAttr(attr);
        setValue(value);
    }
    
    /**
     *  return a Document represetation of this object
     */
    
    public Document getDocument(MimeMediaType asMimeType) {
        StructuredDocument adv = (StructuredTextDocument)
        StructuredDocumentFactory.newStructuredDocument( asMimeType,
        getAdvertisementType() );
        Element e;
        
        e = adv.createElement(typeTag, Integer.toString(getDiscoveryType()));
        adv.appendChild(e);
        
        int threshold = getThreshold();
        
        if( threshold < 0 )
            throw new IllegalStateException( "threshold must be >= 0" );
        
        e = adv.createElement( thresholdTag, Integer.toString(threshold) );
        adv.appendChild(e);
        
        String peerAdv = getPeerAdv();
        
        if( (peerAdv != null) && (peerAdv.length() > 0) ) {
            e = adv.createElement(peerAdvTag, getPeerAdv());
            adv.appendChild(e);
        }
        
        String attr = getAttr();
        
        if( (null != attr) && (attr.length() >0) ) {
            e = adv.createElement(queryAttrTag, attr );
            adv.appendChild(e);
            
            String value = getValue();
            if( (null == value) || (0 == value.length()) )
                throw new IllegalStateException( "Query value not initialized" );
            
            e = adv.createElement( queryValueTag, value );
            adv.appendChild(e);
        }
        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 );
            
            return out.toString();
        }
        catch( Exception e ) {
            return "";
        }
    }
    
    
}