resolverquery.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: ResolverQuery.java,v 1.18 2002/06/13 17:15:28 bondolo Exp $
 */
package net.jxta.impl.protocol;

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

import java.io.IOException;

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

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

/**
 * ResolverQuery provides the binding for the message to query other node
 */
public class ResolverQuery extends ResolverQueryMsg  {
  
  /**
   * The Log4J debugging category.
   *
   * @since 1.0
   */
  private final static Category LOG = Category.getInstance(ResolverQuery.class.getName());
  
  private static final String handlernameTag = "HandlerName";
  private static final String  credentialTag = "jxta:Cred";
  private static final String     queryIdTag = "QueryID";
  private static final String   srcPeerIdTag = "SrcPeerID";
  private static final String       queryTag = "Query";
  
  /** Construct a doc from InputStream
   * @param stream
   * @throws IOException  */
  public ResolverQuery( 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
   * @param doc  */
  public ResolverQuery( TextElement doc ) {
    
    if( !getAdvertisementType().equals( doc.getName() ) ) {
      throw new IllegalArgumentException( "Could not construct : " +
      getClass().getName() + "from doc containing a " +
      doc.getName() );
    }
    readIt( doc );
  }
  
  
  /**
   * @param doc  */  
  public void readIt( TextElement doc ) {
    
    Enumeration elements = doc.getChildren();
    
    while (elements.hasMoreElements()) {
      
      TextElement elem = (TextElement) elements.nextElement();
      if( elem.getName().equals(handlernameTag)) {
        setHandlerName( elem.getTextValue() );
        continue;
      }
      
      // Set credential
      if( elem.getName().equals(credentialTag)) {
        setCredential(StructuredDocumentUtils.copyAsDocument(elem));
        continue;
      }
      
      // Set queryid
      if( elem.getName().equals(queryIdTag)) {
        queryid=Integer.parseInt( elem.getTextValue() );
        continue;
      }
      
      // Set source peer
      if( elem.getName().equals(srcPeerIdTag)) {
        setSrc(elem.getTextValue());
        continue;
      }
      // Set query
      if( elem.getName().equals(queryTag) ) {
        setQuery( elem.getTextValue() );
        continue;
      }
    }
  }
  
  /** Construct a doc from strings
   * @param HandlerName
   * @param Credential
   * @param pId
   * @param Query
   * @param qid  */
  public ResolverQuery(String HandlerName, StructuredDocument Credential, String pId,
  String Query, int qid) {
    
    setHandlerName(HandlerName);
    setCredential(Credential);
    setQueryId(qid);
    setSrc(pId);
    setQuery(Query);
  }
  
  /**
   * return a Document represetation of this object
   * @param encodeAs
   * @return
   */
  public Document getDocument( MimeMediaType encodeAs ) {
    
    StructuredTextDocument adv = (StructuredTextDocument)
    StructuredDocumentFactory.newStructuredDocument(
    encodeAs,
    getAdvertisementType() );
    Element e;
    
    e = adv.createElement(handlernameTag, getHandlerName());
    adv.appendChild(e);
    if (getCredential() != null){
      StructuredDocumentUtils.copyElements(adv, adv , getCredential());
    }
    e = adv.createElement(queryIdTag, Integer.toString(queryid));
    adv.appendChild(e);
    e = adv.createElement(srcPeerIdTag, getSrc());
    adv.appendChild(e);
    e = adv.createElement(queryTag, getQuery());
    adv.appendChild(e);
    return adv;
  }
  
  /**
   * retunrs the this doc as string
   * @return String representation of the of this
   * message type
   */
  
  public String toString() {
    
    try {
      StringWriter    out = new StringWriter();
      StructuredTextDocument doc =(StructuredTextDocument)
      getDocument( new MimeMediaType("text/xml") );
      
      doc.sendToWriter( out );
      
      String result = out.toString();
      
      return result;
    }
    catch( Exception e ) {
      LOG.debug( "Could not generate ResolverQuery" );
      return "";
    }
  }
}