Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/container/QueryContainerFactory.java @ 1127:ebeb56428409

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Added license headers and license file. geo-backend/trunk@1261 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:52:22 +0000
parents 8a652a451bc6
children
rev   line source
1127
ebeb56428409 Added license headers and license file.
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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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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
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15 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException;
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17 /**
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18 * Factoryclass to provide a singleton-Instance of an
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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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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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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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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 }
http://dive4elements.wald.intevation.org