Mercurial > dive4elements > gnv-client
annotate gnv/src/main/java/de/intevation/gnv/action/sessionmodel/SessionModelFactory.java @ 681:15ac78a91d1b
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gnv/trunk@852 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 29 Mar 2010 08:04:15 +0000 |
parents | 14eecfde4607 |
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1 /** |
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2 * |
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3 */ |
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4 package de.intevation.gnv.action.sessionmodel; |
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5 |
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6 import javax.servlet.http.HttpServletRequest; |
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7 |
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8 import org.apache.log4j.Logger; |
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9 |
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10 /** |
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11 * @author Tim Englich <tim.englich@intevation.de> |
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12 * |
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13 */ |
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14 public class SessionModelFactory { |
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15 |
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16 public final static String SESSION_MODEL_ID = "de.intevation.gnv.action.sessionmodel.SessionModel.ID"; |
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17 /** |
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18 * the logger, used to log exceptions and additonaly information |
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19 */ |
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20 private static Logger log = Logger.getLogger(SessionModelFactory.class); |
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21 |
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22 /** |
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23 * The singleton Instance of this Factory. |
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24 */ |
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25 private static SessionModelFactory instance = null; |
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26 |
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27 /** |
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28 * Constructor |
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29 */ |
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30 private SessionModelFactory() { |
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31 super(); |
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32 } |
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33 |
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34 /** |
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35 * This Method provides an singleton Instance of this Class. |
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36 * |
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37 * @return an singleton Instance of this Class |
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38 */ |
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39 public synchronized static SessionModelFactory getInstance() { |
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40 if (instance == null) { |
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41 instance = new SessionModelFactory(); |
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42 } |
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43 return instance; |
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44 } |
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45 |
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46 /** |
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47 * Getting the ArtifactDatabaseClient |
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48 * |
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49 * @return the ArtifactDatabaseClient |
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50 */ |
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51 public SessionModel getSessionModel(HttpServletRequest request) { |
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52 synchronized (request) { |
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53 SessionModel sm = null; |
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54 Object obj = request.getSession().getAttribute(SESSION_MODEL_ID); |
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55 if (obj instanceof SessionModel) { |
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56 sm = (SessionModel) obj; |
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57 } else { |
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58 sm = new DefaultSessionModel(); |
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59 request.getSession().setAttribute(SESSION_MODEL_ID, sm); |
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60 } |
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61 |
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62 return sm; |
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63 } |
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64 } |
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65 |
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66 } |