Mercurial > dive4elements > gnv-client
comparison geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/container/QueryContainerFactory.java @ 132:5a583cff97ea
Implementation of the Datainfrastructure for fetching Data from different DataStores.
geo-backend/trunk@12 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Tim Englich <tim.englich@intevation.de> |
|---|---|
| date | Fri, 04 Sep 2009 08:11:30 +0000 |
| parents | |
| children | 3cbf11c67fdc |
comparison
equal
deleted
inserted
replaced
| 131:d8ff739b9f3b | 132:5a583cff97ea |
|---|---|
| 1 /** | |
| 2 * | |
| 3 */ | |
| 4 package de.intevation.gnv.geobackend.base.query.container; | |
| 5 | |
| 6 import java.util.Properties; | |
| 7 | |
| 8 import org.apache.log4j.Logger; | |
| 9 | |
| 10 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException; | |
| 11 | |
| 12 /** | |
| 13 * @author Tim Englich <tim.englich@intevation.de> | |
| 14 * | |
| 15 */ | |
| 16 public class QueryContainerFactory { | |
| 17 | |
| 18 /** | |
| 19 * the logger, used to log exceptions and additonaly information | |
| 20 */ | |
| 21 private static Logger log = Logger.getLogger(QueryContainerFactory.class); | |
| 22 | |
| 23 | |
| 24 /** | |
| 25 * The singleton Instance of this Factory. | |
| 26 */ | |
| 27 private static QueryContainerFactory instance = null; | |
| 28 | |
| 29 /** | |
| 30 * The ConnectionPool providing the Connections to the DatabaseBackends | |
| 31 */ | |
| 32 private QueryContainer queryContainer = null; | |
| 33 | |
| 34 /** | |
| 35 * Basic-Constructor of this Class | |
| 36 */ | |
| 37 private QueryContainerFactory() { | |
| 38 super(); | |
| 39 } | |
| 40 | |
| 41 /** | |
| 42 * This Method provides an singleton Instance of this Class. | |
| 43 * @return an singleton Instance of this Class | |
| 44 */ | |
| 45 public static QueryContainerFactory getInstance(){ | |
| 46 if (instance == null){ | |
| 47 instance = new QueryContainerFactory(); | |
| 48 } | |
| 49 return instance; | |
| 50 } | |
| 51 | |
| 52 | |
| 53 /** | |
| 54 * Getting the QueryContainer | |
| 55 * @return the QueryContainer | |
| 56 */ | |
| 57 public QueryContainer getQueryContainer(){ | |
| 58 return this.queryContainer; | |
| 59 } | |
| 60 | |
| 61 /** | |
| 62 * Initializes the QueryContainer. | |
| 63 * Should only be called once on system startup | |
| 64 * @param properties the Properties for the Individual Configuration of the QueryContainerbb | |
| 65 * @throws QueryContainerException | |
| 66 */ | |
| 67 public synchronized void initializeQueryContainer(Properties properties) throws QueryContainerException{ | |
| 68 log.debug("ConnectionPoolFactory.initializeConnectionPool"); | |
| 69 if (this.queryContainer == null){ | |
| 70 this.queryContainer = new DefaultQueryContainer(); | |
| 71 this.queryContainer.initialize(properties); | |
| 72 }else{ | |
| 73 log.warn("ConnectionPool already initialized"); | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 /** | |
| 78 * Checks if the QueryContainer has already been initialized. | |
| 79 * @return true if the QueryContainer is initialized. | |
| 80 */ | |
| 81 public boolean isInitialized(){ | |
| 82 return this.queryContainer != null; | |
| 83 } | |
| 84 } |