Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/action/sessionmodel/SessionModelFactory.java @ 954:a88fc6320cf8

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Add more Javadocs gnv/trunk@1098 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 18 May 2010 09:11:31 +0000
parents 2659a5b1fa1e
children 28a0628b11b0
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1 package de.intevation.gnv.action.sessionmodel;
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2
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3 import javax.servlet.http.HttpServletRequest;
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4
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5 import org.apache.log4j.Logger;
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6
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7 /**
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8 * Creates and restores <code>SessionModel</code> objects from <code>
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9 * HttpServletRequest</code>.
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10 *
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11 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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12 */
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13 public class SessionModelFactory {
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14
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15 /**
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16 * The id of the <code>SessionModel</code> that must be used to lookup the
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17 * model from the given <code>HttpSession<Code> of the request.
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18 */
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19 public final static String SESSION_MODEL_ID = "de.intevation.gnv.action." +
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20 "sessionmodel.SessionModel.ID";
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21
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22 /**
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23 * the logger, used to log exceptions and additonaly information
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24 */
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25 private static Logger log = Logger.getLogger(SessionModelFactory.class);
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26
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27 /**
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28 * The singleton Instance of this Factory.
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29 */
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30 private static SessionModelFactory instance = null;
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31
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32 /**
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33 * Constructor
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34 */
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35 private SessionModelFactory() {
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36 super();
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37 }
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38
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39 /**
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40 * This Method provides an singleton Instance of this Class.
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41 * @return an singleton Instance of this Class
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42 */
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43 public synchronized static SessionModelFactory getInstance() {
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44 log.debug("SessionModelFactory.getInstance");
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45 if (instance == null) {
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46 instance = new SessionModelFactory();
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47 }
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48 return instance;
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49 }
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50
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51 /**
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52 * Getting the ArtifactDatabaseClient
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53 * @param request the tequest from which the SessionModel should be read.
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54 * @return the ArtifactDatabaseClient
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55 */
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56 public SessionModel getSessionModel(HttpServletRequest request) {
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57 log.debug("SessionModelFactory.getSessionModel");
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58 synchronized (request) {
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59 SessionModel sm = null;
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60 Object obj = request.getSession().getAttribute(SESSION_MODEL_ID);
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61 if (obj instanceof SessionModel) {
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62 sm = (SessionModel) obj;
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63 } else {
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64 sm = new DefaultSessionModel(request.getLocale());
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65 request.getSession().setAttribute(SESSION_MODEL_ID, sm);
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66 }
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67
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68 return sm;
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69 }
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70 }
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71 }
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72 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org