Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WKmsFactory.java @ 1726:e3b9164a85fe

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Fetch name of static WKms. flys-artifacts/trunk@3008 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 18 Oct 2011 14:03:43 +0000
parents fb4fb1c67c35
children 2e5ebdeb8af9
rev   line source
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1 package de.intevation.flys.artifacts.model;
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2
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3 import java.util.List;
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4
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5 import net.sf.ehcache.Cache;
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6 import net.sf.ehcache.Element;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import org.hibernate.Session;
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11
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12 import org.hibernate.SQLQuery;
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13 import org.hibernate.type.StandardBasicTypes;
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14
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15 import de.intevation.flys.artifacts.model.WKms;
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16 import de.intevation.flys.artifacts.model.WKmsImpl;
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17
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18 import de.intevation.flys.artifacts.cache.CacheFactory;
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19
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20 import de.intevation.flys.backend.SessionHolder;
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21
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22 /**
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23 * Factory to access ready-made WKms for other (than computed) 'kinds' of
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24 * WST-data.
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25 */
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26 public class WKmsFactory
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27 {
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28 private static Logger log = Logger.getLogger(WKmsFactory.class);
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29
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30 /** Query to get km and ws for wst_id and column_pos. */
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31 public static final String SQL_SELECT_WS =
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32 "SELECT km, w FROM wst_w_values " +
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33 "WHERE wst_id = :wst_id AND column_pos = :column_pos";
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34
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35 public static final String SQL_SELECT_NAME =
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36 "SELECT name " +
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37 "FROM wst_columns "+
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38 "WHERE wst_id = :wst_id AND position = :column_pos";
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39
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40
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41 private WKmsFactory() {
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42 }
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43
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44
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45 /**
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46 * Get WKms for given column and wst_id, caring about the cache.
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47 */
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48 public static WKms getWKms(int column, int wst_id) {
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49 log.debug("WKmsFactory.getWKms");
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50 Cache cache = CacheFactory.getCache(StaticWKmsCacheKey.CACHE_NAME);
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51
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52 StaticWKmsCacheKey cacheKey;
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53
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54 if (cache != null) {
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55 cacheKey = new StaticWKmsCacheKey(wst_id, column);
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56 Element element = cache.get(cacheKey);
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57 if (element != null) {
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58 log.debug("Got static wst values from cache");
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59 return (WKms)element.getValue();
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60 }
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61 }
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62 else {
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63 cacheKey = null;
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64 }
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65
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66 WKms values = getWKmsUncached(column, wst_id);
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67
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68 if (values != null && cacheKey != null) {
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69 log.debug("Store static wst values in cache.");
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70 Element element = new Element(cacheKey, values);
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71 cache.put(element);
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72 }
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73 return values;
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74 }
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75
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76
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77 /**
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78 * Get WKms from db.
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79 * @param column the position columns value
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80 * @param wst_id database id of the wst
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81 * @return according WKms.
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82 */
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83 public static WKms getWKmsUncached(int column, int wst_id) {
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84 log.debug("WKmsFactory.getWKmsUncached c/" + column + ", wst_id/" + wst_id);
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85 Session session = SessionHolder.HOLDER.get();
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86
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87 String name = "todo";
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88
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89 SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_NAME)
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90 .addScalar("name", StandardBasicTypes.STRING);
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91 nameQuery.setInteger("wst_id", wst_id);
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92 nameQuery.setInteger("column_pos", column);
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93
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94 List<String> names = nameQuery.list();
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95 if (names.size() >= 1) {
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96 name = names.get(0);
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97 }
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98
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99 WKmsImpl wkms = new WKmsImpl(name);
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100
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101 SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WS)
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102 .addScalar("km", StandardBasicTypes.DOUBLE)
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103 .addScalar("w", StandardBasicTypes.DOUBLE);
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104 sqlQuery.setInteger("wst_id", wst_id);
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105 sqlQuery.setInteger("column_pos", column);
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106
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107 List<Object []> results = sqlQuery.list();
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108
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109 double kms [] = new double[results.size()];
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110 double ws [] = new double[results.size()];
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111
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112 int lastColumn = Integer.MAX_VALUE;
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113
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114 for (int i = 0; i < results.size(); i++) {
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115 Object[] row = results.get(i);
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116 wkms.add((Double) row[0], (Double) row[1]);
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117 }
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118
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119 return wkms;
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120 }
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121 }
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122 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org