Mercurial > dive4elements > gnv-client
annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/container/QueryContainerFactory.java @ 887:b757def3ff55
Bring @author javadoc tags in form '@author <a href="john.doe@example.com">John Doe</a>'
geo-backend/trunk@859 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 29 Mar 2010 09:45:05 +0000 |
parents | 8b442223741c |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
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1 package de.intevation.gnv.geobackend.base.query.container; |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
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parents:
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2 |
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3 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException; |
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4 |
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5 import java.util.Properties; |
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6 |
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7 import org.apache.log4j.Logger; |
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8 |
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9 /** |
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10 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a> |
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11 * |
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12 */ |
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13 public class QueryContainerFactory { |
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14 |
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15 /** |
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16 * the logger, used to log exceptions and additonaly information |
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17 */ |
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18 private static Logger log = Logger.getLogger(QueryContainerFactory.class); |
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19 |
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20 |
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21 /** |
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22 * The singleton Instance of this Factory. |
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23 */ |
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24 private static QueryContainerFactory instance = null; |
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25 |
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26 /** |
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27 * The ConnectionPool providing the Connections to the DatabaseBackends |
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28 */ |
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29 private QueryContainer queryContainer = null; |
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30 |
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31 /** |
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32 * Basic-Constructor of this Class |
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33 */ |
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34 private QueryContainerFactory() { |
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35 super(); |
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36 } |
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37 |
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38 /** |
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39 * This Method provides an singleton Instance of this Class. |
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40 * @return an singleton Instance of this Class |
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41 */ |
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42 public static synchronized QueryContainerFactory getInstance(){ |
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43 if (instance == null){ |
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44 instance = new QueryContainerFactory(); |
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45 } |
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46 return instance; |
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47 } |
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48 |
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49 |
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50 /** |
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51 * Getting the QueryContainer |
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52 * @return the QueryContainer |
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53 */ |
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54 public QueryContainer getQueryContainer(){ |
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55 return this.queryContainer; |
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56 } |
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57 |
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58 /** |
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59 * Initializes the QueryContainer. |
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60 * Should only be called once on system startup |
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61 * @param properties the Properties for the Individual Configuration of the QueryContainerbb |
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62 * @throws QueryContainerException |
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63 */ |
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64 public synchronized void initializeQueryContainer(Properties properties) throws QueryContainerException{ |
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65 log.debug("ConnectionPoolFactory.initializeConnectionPool"); |
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66 if (this.queryContainer == null){ |
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67 this.queryContainer = new DefaultQueryContainer(); |
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68 this.queryContainer.initialize(properties); |
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69 }else{ |
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70 log.warn("ConnectionPool already initialized"); |
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71 } |
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72 } |
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73 |
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74 /** |
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75 * Checks if the QueryContainer has already been initialized. |
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76 * @return true if the QueryContainer is initialized. |
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77 */ |
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78 public boolean isInitialized(){ |
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79 return this.queryContainer != null; |
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80 } |
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81 } |