/*

  * Copyright 1999-2001,2004 The Apache Software Foundation.

  * 

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  * 

  *      http://www.apache.org/licenses/LICENSE-2.0

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.latka.jelly;

 import java.util.Map;

 import org.apache.commons.jelly.JellyTagException;

 import org.apache.commons.jelly.TagSupport;

 import org.apache.commons.jelly.XMLOutput;

 import org.apache.commons.latka.http.Session;

 import org.apache.commons.latka.http.SessionImpl;

 /**

  *

  * @author  Morgan Delagrange

  */

 public class SessionTag extends TagSupport {

     protected String _sessionId = null;

     protected String _label = null;

     protected Session _session = null;

     /**

      *  

      *

      * @param xmlOutput a place to write output

      * @throws JellyTagException if the tag body could not be invoked

      */

     public void doTag(XMLOutput xmlOutput) throws JellyTagException {

         _session = findSession(_sessionId);

         invokeBody(xmlOutput);

     }

     public Session getSession() {

         return _session;

     }

     protected Session findSession(String sessionId) {

         if (sessionId == null) {

             return new SessionImpl();

         }

         SuiteTag tag = (SuiteTag) findAncestorWithClass(SuiteTag.class);

         Map sessionCache = tag.getSessionCache();

         Session cachedSession = (Session) sessionCache.get(sessionId);

         if (cachedSession == null) {

             Session session = new SessionImpl();

             sessionCache.put(sessionId,session);

             return session;

         } else {

             return cachedSession;

         }

     }

     /**

      * Optionally sets the session id.  If a session id

      * is specified, state information (cookies, etc.)

      * will be shared by any session with the same id.

      * 

      * @param sessionId arbitrary session id, specified by the user in

      *                  the Latka script

      */

     public void setSessionId(String sessionId) {

         _sessionId = sessionId;

     }

     /**

      * Set the label for this session

      * 

      * @param label  session label

      */

     public void setLabel(String label) {

         _label = label;

     }

 }