tim@8: /**
tim@8:  *
tim@8:  */
tim@8: package de.intevation.gnv.action.sessionmodel;
tim@8: 
tim@8: import javax.servlet.http.HttpServletRequest;
tim@8: 
tim@8: import org.apache.log4j.Logger;
tim@8: 
tim@8: /**
tim@8:  * @author Tim Englich <tim.englich@intevation.de>
sascha@681:  *
tim@8:  */
tim@8: public class SessionModelFactory {
tim@36: 
tim@8:     public final static String SESSION_MODEL_ID = "de.intevation.gnv.action.sessionmodel.SessionModel.ID";
tim@8:     /**
tim@8:      * the logger, used to log exceptions and additonaly information
tim@8:      */
tim@8:     private static Logger log = Logger.getLogger(SessionModelFactory.class);
tim@8: 
tim@8:     /**
tim@8:      * The singleton Instance of this Factory.
tim@8:      */
tim@8:     private static SessionModelFactory instance = null;
tim@8: 
tim@8:     /**
tim@8:      * Constructor
tim@8:      */
tim@8:     private SessionModelFactory() {
tim@8:         super();
tim@8:     }
tim@8: 
tim@8:     /**
tim@8:      * This Method provides an singleton Instance of this Class.
sascha@681:      *
tim@8:      * @return an singleton Instance of this Class
tim@8:      */
ingo@394:     public synchronized static SessionModelFactory getInstance() {
tim@36:         if (instance == null) {
tim@8:             instance = new SessionModelFactory();
tim@8:         }
tim@8:         return instance;
tim@8:     }
tim@36: 
tim@8:     /**
tim@8:      * Getting the ArtifactDatabaseClient
sascha@681:      *
tim@8:      * @return the ArtifactDatabaseClient
tim@8:      */
tim@36:     public SessionModel getSessionModel(HttpServletRequest request) {
ingo@394:         synchronized (request) {
tim@8:             SessionModel sm = null;
ingo@394:             Object obj = request.getSession().getAttribute(SESSION_MODEL_ID);
ingo@394:             if (obj instanceof SessionModel) {
ingo@394:                 sm = (SessionModel) obj;
tim@36:             } else {
tim@8:                 sm = new DefaultSessionModel();
tim@8:                 request.getSession().setAttribute(SESSION_MODEL_ID, sm);
tim@8:             }
tim@36: 
tim@8:             return sm;
tim@36:         }
tim@8:     }
tim@8: 
tim@8: }