Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentDensityFactory.java @ 7180:e0b6b6cf4708
issue1435: Minor refactoring that will come handy to load SedimentLoads
for "standalone" sedimentyield artifact.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 26 Sep 2013 21:30:19 +0200 |
parents | 51f28e5417ee |
children | 1750b4448c0c |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.model.minfo; |
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10 |
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11 import java.util.List; |
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12 |
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13 import net.sf.ehcache.Cache; |
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14 import net.sf.ehcache.Element; |
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15 |
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16 import org.apache.log4j.Logger; |
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17 import org.hibernate.SQLQuery; |
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18 import org.hibernate.Session; |
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19 import org.hibernate.type.StandardBasicTypes; |
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20 |
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21 import org.dive4elements.river.artifacts.cache.CacheFactory; |
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22 import org.dive4elements.river.backend.SessionHolder; |
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23 |
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24 |
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25 public class SedimentDensityFactory |
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26 { |
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27 /** Private logger to use here. */ |
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28 private static Logger log = Logger.getLogger(SedimentDensityFactory.class); |
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29 |
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30 private static final String DENSITY_CACHE_NAME = "sedimentdensity"; |
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31 |
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32 /**Query to get sediment density values and kms. */ |
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33 private static final String SQL_SELECT_DENSITY = |
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34 "SELECT sdv.station AS km, " + |
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35 " sdv.density AS density," + |
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36 " sdv.year AS year " + |
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37 " FROM sediment_density sd" + |
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38 " JOIN rivers r ON sd.river_id = r.id " + |
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39 " JOIN sediment_density_values sdv ON sd.id = sdv.sediment_density_id" + |
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40 " WHERE r.name = :name"; |
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41 |
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42 private SedimentDensityFactory() {} |
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43 |
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44 public static SedimentDensity getSedimentDensity( |
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45 String river, |
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46 double startKm, |
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47 double endKm, |
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48 int year |
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49 ) { |
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50 log.debug("getSedimentDensity"); |
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51 Cache cache = CacheFactory.getCache(DENSITY_CACHE_NAME); |
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52 |
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53 if (cache == null) { |
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54 log.debug("Cache not configured."); |
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55 return getSedimentDensityUncached(river, startKm, endKm, year); |
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56 } |
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57 |
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58 String key = river + startKm + endKm; |
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59 Element element = cache.get(key); |
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60 if (element != null) { |
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61 log.debug("SedimentDensity found in cache!"); |
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62 return (SedimentDensity)element.getValue(); |
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63 } |
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64 SedimentDensity value = |
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65 getSedimentDensityUncached(river, startKm, endKm, year); |
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66 |
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67 if (value != null && key != null) { |
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68 log.debug("Store sediment density values in cache."); |
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69 element = new Element(key, value); |
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70 cache.put(element); |
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71 } |
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72 return value; |
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73 } |
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74 |
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75 private static SedimentDensity getSedimentDensityUncached( |
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76 String river, |
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77 double startKm, |
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78 double endKm, |
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79 int year |
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80 ) { |
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81 log.debug("getSedimentDensityUncached"); |
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82 Session session = SessionHolder.HOLDER.get(); |
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83 SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_DENSITY) |
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84 .addScalar("km", StandardBasicTypes.DOUBLE) |
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85 .addScalar("density", StandardBasicTypes.DOUBLE) |
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86 .addScalar("year", StandardBasicTypes.INTEGER); |
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87 sqlQuery.setString("name", river); |
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88 List<Object[]> results = sqlQuery.list(); |
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89 SedimentDensity density = new SedimentDensity(); |
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90 for (Object[] row : results) { |
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91 if (row[0] != null && row[1] != null && row[2] != null) { |
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92 density.addDensity((Double)row[0], (Double)row[1], (Integer)row[2]); |
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93 } |
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94 } |
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95 |
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96 density.cleanUp(); |
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97 return density; |
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98 } |
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99 } |
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100 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |