Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/state/StateFactory.java @ 1138:2c00570ab3bd

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merged doc
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:02 +0200
parents f953c9a559d8
children
rev   line source
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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.state;
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10
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11 import de.intevation.gnv.artifacts.GNVArtifactBase;
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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 import org.w3c.dom.Node;
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16
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17 /**
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18 * This factory should be used to create new state objects with help of a
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19 * configuration segment.
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20 *
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21 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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22 *
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23 */
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24 public class StateFactory {
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25
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26 /**
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27 * the logger, used to log exceptions and additonaly information
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28 */
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29 private static Logger log = Logger.getLogger(GNVArtifactBase.class);
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30
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31 private static StateFactory instance = null;
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32
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33 /**
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34 * Constructor
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35 */
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36 public StateFactory() {
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37 super();
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38 }
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39
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40 /**
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41 * Return the instance of this class.
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42 */
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43 public static StateFactory getInstance() {
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44 if (instance == null) {
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45 instance = new StateFactory();
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46 }
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47 return instance;
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48 }
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49
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50 /**
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51 * This method creates a new state with help of the information in <i>
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52 * configuration</i> and calls its setup method after creation.
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53 *
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54 * @return the new state.
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55 */
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56 public State createState(Node configuration) {
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57 log.debug("StateFactory.createState");
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58 State state = null;
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59 try {
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60 String classname = ((org.w3c.dom.Element)configuration).getAttribute("state");
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61 state = (State) (Class.forName(classname).newInstance());
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62 state.setup(configuration);
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63 } catch (InstantiationException e) {
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64 log.error(e, e);
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65 } catch (IllegalAccessException e) {
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66 log.error(e, e);
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67 } catch (ClassNotFoundException e) {
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68 log.error(e, e);
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69 }
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70 return state;
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71 }
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72 }
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73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org