Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/container/QueryContainerFactory.java @ 886:8b442223741c

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Ordered imports. Removed empty headers. geo-backend/trunk@856 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 29 Mar 2010 09:22:07 +0000
parents 1c3efbd2fc5a
children b757def3ff55
rev   line source
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5a583cff97ea 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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2
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8b442223741c Ordered imports. Removed empty headers.
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3 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException;
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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 Tim Englich <tim.englich@intevation.de>
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11 *
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12 */
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13 public class QueryContainerFactory {
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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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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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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 }
http://dive4elements.wald.intevation.org