Mercurial > dive4elements > gnv-client
view gnv/src/main/java/de/intevation/gnv/action/sessionmodel/SessionModelFactory.java @ 394:14eecfde4607
Render links to step back to previous states into gui. Added controller to advance back to these states.
gnv/trunk@538 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 13 Jan 2010 22:17:02 +0000 |
parents | ad381cc47217 |
children | 15ac78a91d1b |
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/** * */ package de.intevation.gnv.action.sessionmodel; import javax.servlet.http.HttpServletRequest; import org.apache.log4j.Logger; /** * @author Tim Englich <tim.englich@intevation.de> * */ public class SessionModelFactory { public final static String SESSION_MODEL_ID = "de.intevation.gnv.action.sessionmodel.SessionModel.ID"; /** * the logger, used to log exceptions and additonaly information */ private static Logger log = Logger.getLogger(SessionModelFactory.class); /** * The singleton Instance of this Factory. */ private static SessionModelFactory instance = null; /** * Constructor */ private SessionModelFactory() { super(); } /** * This Method provides an singleton Instance of this Class. * * @return an singleton Instance of this Class */ public synchronized static SessionModelFactory getInstance() { if (instance == null) { instance = new SessionModelFactory(); } return instance; } /** * Getting the ArtifactDatabaseClient * * @return the ArtifactDatabaseClient */ public SessionModel getSessionModel(HttpServletRequest request) { synchronized (request) { SessionModel sm = null; Object obj = request.getSession().getAttribute(SESSION_MODEL_ID); if (obj instanceof SessionModel) { sm = (SessionModel) obj; } else { sm = new DefaultSessionModel(); request.getSession().setAttribute(SESSION_MODEL_ID, sm); } return sm; } } }