Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/action/sessionmodel/SessionModelFactory.java @ 1022:28a0628b11b0

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Added license file and license header. gnv/trunk@1258 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:15:08 +0000
parents a88fc6320cf8
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.action.sessionmodel;
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10
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11 import javax.servlet.http.HttpServletRequest;
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12
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13 import org.apache.log4j.Logger;
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14
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15 /**
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16 * Creates and restores <code>SessionModel</code> objects from <code>
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17 * HttpServletRequest</code>.
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18 *
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19 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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20 */
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21 public class SessionModelFactory {
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22
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23 /**
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24 * The id of the <code>SessionModel</code> that must be used to lookup the
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25 * model from the given <code>HttpSession<Code> of the request.
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26 */
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27 public final static String SESSION_MODEL_ID = "de.intevation.gnv.action." +
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28 "sessionmodel.SessionModel.ID";
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29
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30 /**
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31 * the logger, used to log exceptions and additonaly information
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32 */
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33 private static Logger log = Logger.getLogger(SessionModelFactory.class);
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34
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35 /**
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36 * The singleton Instance of this Factory.
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37 */
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38 private static SessionModelFactory instance = null;
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39
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40 /**
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41 * Constructor
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42 */
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43 private SessionModelFactory() {
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44 super();
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45 }
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46
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47 /**
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48 * This Method provides an singleton Instance of this Class.
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49 * @return an singleton Instance of this Class
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50 */
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51 public synchronized static SessionModelFactory getInstance() {
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52 log.debug("SessionModelFactory.getInstance");
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53 if (instance == null) {
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54 instance = new SessionModelFactory();
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55 }
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56 return instance;
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57 }
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58
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59 /**
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60 * Getting the ArtifactDatabaseClient
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61 * @param request the tequest from which the SessionModel should be read.
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62 * @return the ArtifactDatabaseClient
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63 */
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64 public SessionModel getSessionModel(HttpServletRequest request) {
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65 log.debug("SessionModelFactory.getSessionModel");
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66 synchronized (request) {
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67 SessionModel sm = null;
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68 Object obj = request.getSession().getAttribute(SESSION_MODEL_ID);
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69 if (obj instanceof SessionModel) {
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70 sm = (SessionModel) obj;
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71 } else {
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72 sm = new DefaultSessionModel(request.getLocale());
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73 request.getSession().setAttribute(SESSION_MODEL_ID, sm);
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74 }
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75
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76 return sm;
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77 }
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78 }
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79 }
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80 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org