Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/container/QueryContainerFactory.java @ 885:1c3efbd2fc5a

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Removes trailing whitespace. geo-backend/trunk@850 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 29 Mar 2010 07:49:16 +0000
parents 3cbf11c67fdc
children 8b442223741c
rev   line source
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5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
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1 /**
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2 *
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3 */
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4 package de.intevation.gnv.geobackend.base.query.container;
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5
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6 import java.util.Properties;
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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 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException;
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11
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12 /**
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13 * @author Tim Englich <tim.englich@intevation.de>
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14 *
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15 */
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16 public class QueryContainerFactory {
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132
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18 /**
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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19 * the logger, used to log exceptions and additonaly information
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20 */
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21 private static Logger log = Logger.getLogger(QueryContainerFactory.class);
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22
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23
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24 /**
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25 * The singleton Instance of this Factory.
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26 */
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27 private static QueryContainerFactory instance = null;
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28
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29 /**
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30 * The ConnectionPool providing the Connections to the DatabaseBackends
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31 */
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32 private QueryContainer queryContainer = null;
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33
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34 /**
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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35 * Basic-Constructor of this Class
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36 */
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37 private QueryContainerFactory() {
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38 super();
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39 }
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40
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41 /**
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42 * This Method provides an singleton Instance of this Class.
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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43 * @return an singleton Instance of this Class
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44 */
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45 public static synchronized QueryContainerFactory getInstance(){
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46 if (instance == null){
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47 instance = new QueryContainerFactory();
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48 }
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49 return instance;
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50 }
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53 /**
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54 * Getting the QueryContainer
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55 * @return the QueryContainer
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56 */
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57 public QueryContainer getQueryContainer(){
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58 return this.queryContainer;
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59 }
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60
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61 /**
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62 * Initializes the QueryContainer.
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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63 * Should only be called once on system startup
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64 * @param properties the Properties for the Individual Configuration of the QueryContainerbb
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65 * @throws QueryContainerException
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66 */
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67 public synchronized void initializeQueryContainer(Properties properties) throws QueryContainerException{
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68 log.debug("ConnectionPoolFactory.initializeConnectionPool");
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69 if (this.queryContainer == null){
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70 this.queryContainer = new DefaultQueryContainer();
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71 this.queryContainer.initialize(properties);
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72 }else{
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73 log.warn("ConnectionPool already initialized");
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74 }
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75 }
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76
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77 /**
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78 * Checks if the QueryContainer has already been initialized.
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79 * @return true if the QueryContainer is initialized.
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80 */
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81 public boolean isInitialized(){
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82 return this.queryContainer != null;
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83 }
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84 }
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