resolverresponse.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,
 * 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: ResolverResponse.java,v 1.24 2004/09/10 16:41:46 hamada Exp $
 */

package net.jxta.impl.protocol;


import java.util.Enumeration;

import net.jxta.document.*;
import net.jxta.protocol.ResolverResponseMsg;
import net.jxta.protocol.RouteAdvertisement;


/**
 * ResolverResponse provides an implementation for 
 * {@link net.jxta.protocol.ResolverResponseMsg} using the standard JXTA
 * Peer Resolver Protocol.
 *
 * <p/>The message is implemented with the following schema:
 *
 *<pre><tt>
 * &lt;xs:complexType name="ResolverResponse">
 *   &lt;xs:all>
 *     &lt;xs:element ref="jxta:Cred" minOccurs="0"/>
 *     &lt;xs:element name="HandlerName" type="xs:string"/>
 *     &lt;xs:element name="QueryID" type="xs:string"/>
 *     &lt;xs:element name="Response" type="xs:anyType"/>
 *   &lt;/xs:all>
 * &lt;/xs:complexType>
 *</tt></pre>
 *
 * @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 class ResolverResponse extends ResolverResponseMsg {

    private static final String handlernameTag = "HandlerName";
    private static final String  credentialTag = "jxta:Cred";
    private static final String     queryIdTag = "QueryID";
    private static final String   responseTag = "Response";

    /**
     * optional route information to send the response
     */
    private RouteAdvertisement srcRoute = null;

    /**
     *
     *  Standard Constructor for new instances.
     */
    public ResolverResponse() {
        super();
    }

    /**
     * Construct a doc from strings
     *
     *  @deprecated use the individual accessor methods instead.
     */
    public ResolverResponse(String HandlerName, StructuredDocument Credential,
                            int QueryId, String Response) {
        this();
        setHandlerName(HandlerName);
        setCredential(Credential);
        setQueryId(QueryId);
        setResponse(Response);
    }

    /**
     * Construct from a StructuredDocument
     *
     */
    public ResolverResponse(Element root) {

        this();
        if (!XMLElement.class.isInstance(root)) {
            throw new IllegalArgumentException(getClass().getName() + " only supports XLMElement");
        }

        XMLElement doc = (XMLElement) root;
        String doctype = doc.getName();

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

        readIt(doc);

        // sanity check
        if (null == getHandlerName()) {
            throw new IllegalArgumentException("Response message does not contain a handler name");
        }

        if (null == getResponse()) {
            throw new IllegalArgumentException("Response message does not contain a response");
        }
    }

    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 response
            if (elem.getName().equals(responseTag)) {
                setResponse(elem.getTextValue());
                continue;
            }
        }
    }

    /**
     *  {@inheritDoc}
     */
    public Document getDocument(MimeMediaType asMimeType) {

        StructuredTextDocument adv = (StructuredTextDocument)
                                     StructuredDocumentFactory.newStructuredDocument(asMimeType, getAdvertisementType());
        if (adv instanceof Attributable) {
            ((Attributable) adv).addAttribute("xmlns:jxta", "http://jxta.org");
        }

        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(responseTag, getResponse());
        adv.appendChild(e);
        return adv;
    }

    /**
     *  {@inheritDoc}
     *
     *  <p/>Result is the response as an XML string.
     */
    public String toString() {
        return getDocument(MimeMediaType.XMLUTF8).toString();
    }

    /**
     * Set optional route information as part of the response.
     * This information is just attached to the response and
     * will not be sent as part of the response
     *
     * @param route RouteAdvertisement to send the response
     */

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

    /**
     * Get optional route information that may be attached to the
     * response. This information is just attached to the response and will
     * not be sent as part of the response
     *
     * @return RouteAdvertisement to send the response
     */

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