Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorFactory.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;
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2
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3 import org.apache.log4j.Logger;
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4
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5 /**
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6 * @author Tim Englich <tim.englich@intevation.de>
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7 *
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8 */
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9 public class QueryExecutorFactory {
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11 public static final String QUERY_EXECUTOR_FACTORY = "query.executor.factory";
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13 /**
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14 * the logger, used to log exceptions and additonaly information
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15 */
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16 private static Logger log = Logger.getLogger(QueryExecutorFactory.class);
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17
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132
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19 /**
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20 * The singleton Instance of this Factory.
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21 */
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22 private static QueryExecutorFactory instance = null;
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23
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24 /**
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25 * Basic-Constructor of this Class
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26 */
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27 public QueryExecutorFactory() {
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28 super();
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29 }
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30
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31 /**
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32 * This Method provides an singleton Instance of this Class.
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33 * @return an singleton Instance of this Class
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34 */
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35 public static synchronized QueryExecutorFactory getInstance(){
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36 if (instance == null) {
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37 String className = System.getProperty(QUERY_EXECUTOR_FACTORY);
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38 if (className != null) {
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39 try {
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40 Class clazz = Class.forName(className);
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41 final QueryExecutorFactory factory =
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42 (QueryExecutorFactory)clazz.newInstance();
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43 Runtime.getRuntime().addShutdownHook(new Thread() {
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44 @Override
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45 public void run() {
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46 factory.shutdown();
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47 }
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48 });
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49 return instance = factory;
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50 }
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51 catch (ClassNotFoundException cnfe) {
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52 log.error(cnfe);
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53 }
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54 catch (InstantiationException ie) {
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55 log.error(ie);
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56 }
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57 catch(IllegalAccessException iae) {
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58 log.error(iae);
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59 }
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60 catch (ClassCastException cce) {
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61 log.error(cce);
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62 }
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63 }
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65 instance = new QueryExecutorFactory();
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66 }
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67 return instance;
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68 }
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70 public void shutdown() {
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71 }
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73 /**
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74 * Getting the QueryExecutor
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75 * @return the QueryExecutor
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76 */
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77 public QueryExecutor getQueryExecutor(){
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78 return new DefaultQueryExceutor();
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79 }
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80 }
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