resolverquerymsg.java

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

/*
 *  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,
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 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 *  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: ResolverQueryMsg.java,v 1.34 2005/08/08 19:59:07 bondolo Exp $
 */
package net.jxta.protocol;


import net.jxta.document.Document;
import net.jxta.document.MimeMediaType;
import net.jxta.document.StructuredDocument;

/**
 * Generic Resolver Service message "Query".
 *
 * @see net.jxta.resolver.ResolverService
 * @see net.jxta.protocol.ResolverResponseMsg
 * @see <a href="http://spec.jxta.org/nonav/v1.0/docbook/JXTAProtocols.html#proto-prp" target="_blank">JXTA Protocols Specification : Peer Resolver Protocol</a>
 **/
public abstract class ResolverQueryMsg {

    /**
     * credential
     **/
    private StructuredDocument credential = null;

    /**
     * Resolver query handler
     **/
    private String handlername = null;

    /**
     *  Number of times a message has been forwarded, not propagated or walked
     **/
    protected int hopcount = 0;

    /**
     * Resolver query
     **/
    private String query = null;

    /**
     *  Query ID of this query. Unique to the originating node only, it can be
     *  utilized to match queries to responses.
     **/
    protected int queryid = 0;

    /**
     * issuer of the query
     **/
    private String srcPeerId = null;

    /**
     * Optional route info about the issuer
     **/
    private RouteAdvertisement srcPeerRoute = null;

    /**
     *  returns the credential
     *
     *@return    String credential
     */

    public StructuredDocument getCredential() {
        return credential;
    }

    /**
     *  Write advertisement into a document. asMimeType is a mime media-type
     *  specification and provides the form of the document which is being
     *  requested. Two standard document forms are defined. 'text/text' encodes
     *  the document in a form nice for printing out and 'text/xml' which
     *  provides an XML format.
     *
     *@param  asMimeType  mime-type requested representation for the returned
     *      document
     *@return             Document document representing the advertisement
     */

    public abstract Document getDocument(MimeMediaType asMimeType);

    /**
     *  returns the handlername
     *
     *@return    String handlername name
     */

    public String getHandlerName() {
        return handlername;
    }

    /**
     *  returns the hop count
     *
     *@return    int hop count
     */

    public int getHopCount() {
        return hopcount;
    }

    /**
     *  increment hop count
     */
    public void incrementHopCount() {
        hopcount++;
    }

    /**
     *  Set hop count
     */
    public void setHopCount(int newCount) {
        hopcount = newCount;
    }

    /**
     *  returns the query
     *
     *@return    String value of the query
     */

    public String getQuery() {
        return query;
    }

    /**
     *  returns queryid value
     *
     *@return    int queryid value
     */

    public int getQueryId() {
        return queryid;
    }

    /**
     *  Returns the source of the query
     *
     *@return    String the peerid of the source of the query
     */

    public String getSrc() {
        return srcPeerId;
    }

    /**
     *  Returns the source route of the query
     *
     *@return RouteAdvertisement route to the issuer of the query
     */

    public RouteAdvertisement getSrcPeerRoute() {
        if (srcPeerRoute == null) {
            return null;
        } else {
            return (RouteAdvertisement) srcPeerRoute.clone();
        }
    }

    /**
     *  set the credential
     *
     *@param  cred  string representing credential
     */

    public void setCredential(StructuredDocument cred) {
        this.credential = cred;
    }

    /**
     *  set the handlername
     *
     *@param  name  handler name
     */

    public void setHandlerName(String name) {
        this.handlername = name;
    }

    /**
     *  set the Query string
     *
     *@param  Query  string representing the query
     */

    public void setQuery(String Query) {
        this.query = Query;
    }

    /**
     *  set the query id. Each query has a unique id.
     *
     *@param  id  int id
     */

    public void setQueryId(int id) {
        queryid = id;
    }

    /**
     *  set the source route of the query
     *
     *@param  route  route advertisement of the source peer
     */

    public void setSrcPeerRoute(RouteAdvertisement route) {
        srcPeerRoute = route;
    }

    /**
     *  Set the source of the query
     *
     *@param  src is a String containing the peerid of the source
     */

    public void setSrc(String src) {
        srcPeerId = src;
    }

    /**
     *  All messages have a type (in xml this is !doctype) which identifies the
     *  message
     *
     *@return    String "jxta:ResolverQuery"
     */

    public static String getAdvertisementType() {
        return "jxta:ResolverQuery";
    }

    /**
     * Create a ResolverResponse from a ResolverQuery message. This method
     * takes advantage of any internal information available in an incoming
     * Resolver query to build a resolver response for that query. For instance,
     * optional route information which may be available in the query will
     * be used to bypass the route resolution to send the response.
     * 
     * WARNING: A side effect of this call is that the following fields are
     *          transfered from the query to the response:
     *            - HandlerName
     *            - QueryId
     *
     *@return ResolverResponseMsg resolverResponse built from the resolverQuery msg
     */

    public abstract ResolverResponseMsg makeResponse();
}