Mercurial > dive4elements > gnv-client
annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/container/QueryContainerFactory.java @ 1145:dfe1ac687c7f tip
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author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Fri, 28 Sep 2012 12:16:15 +0200 |
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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.geobackend.base.query.container; |
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10 |
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11 import java.util.Properties; |
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12 |
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13 import org.apache.log4j.Logger; |
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14 |
891 | 15 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException; |
16 | |
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17 /** |
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18 * Factoryclass to provide a singleton-Instance of an |
891 | 19 * <code>QueryContainer</code>-Object |
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20 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a> |
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21 */ |
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22 public class QueryContainerFactory { |
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23 |
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24 /** |
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25 * the logger, used to log exceptions and additonaly information |
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26 */ |
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27 private static Logger log = Logger.getLogger(QueryContainerFactory.class); |
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28 |
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29 |
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30 /** |
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31 * The singleton Instance of this Factory. |
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32 */ |
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33 private static QueryContainerFactory instance = null; |
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34 |
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35 /** |
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36 * The ConnectionPool providing the Connections to the DatabaseBackends |
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37 */ |
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38 private QueryContainer queryContainer = null; |
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39 |
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40 /** |
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41 * Basic-Constructor of this Class |
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42 */ |
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43 private QueryContainerFactory() { |
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44 super(); |
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45 } |
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46 |
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47 /** |
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48 * This Method provides an singleton Instance of this Class. |
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49 * @return an singleton Instance of this Class |
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50 */ |
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51 public static synchronized QueryContainerFactory getInstance(){ |
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52 if (instance == null){ |
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53 instance = new QueryContainerFactory(); |
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54 } |
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55 return instance; |
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56 } |
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57 |
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58 |
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59 /** |
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60 * Getting the QueryContainer |
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61 * @return the QueryContainer |
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62 */ |
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63 public QueryContainer getQueryContainer(){ |
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64 return this.queryContainer; |
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65 } |
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66 |
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67 /** |
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68 * Initializes the QueryContainer. |
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69 * Should only be called once on system startup |
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70 * @param properties the Properties for the Individual Configuration of the QueryContainerbb |
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71 * @throws QueryContainerException |
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72 */ |
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73 public synchronized void initializeQueryContainer(Properties properties) throws QueryContainerException{ |
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74 log.debug("ConnectionPoolFactory.initializeConnectionPool"); |
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75 if (this.queryContainer == null){ |
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76 this.queryContainer = new DefaultQueryContainer(); |
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77 this.queryContainer.initialize(properties); |
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78 }else{ |
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79 log.warn("ConnectionPool already initialized"); |
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80 } |
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81 } |
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82 |
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83 /** |
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84 * Checks if the QueryContainer has already been initialized. |
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85 * @return true if the QueryContainer is initialized. |
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86 */ |
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87 public boolean isInitialized(){ |
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88 return this.queryContainer != null; |
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89 } |
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90 } |