Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WQKmsFactory.java @ 1825:02cd002205a3

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Added 'static' wqkms data access. flys-artifacts/trunk@3154 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 03 Nov 2011 13:22:55 +0000
parents
children 853cd2120d69
rev   line source
1825
02cd002205a3 Added 'static' wqkms data access.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
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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.WQKms;
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16
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17 import de.intevation.flys.artifacts.cache.CacheFactory;
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18
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19 import de.intevation.flys.backend.SessionHolder;
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20
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21 /**
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22 * Factory to access ready-made WQKms for other (than computed) 'kinds' of
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23 * WST-data.
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24 */
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25 public class WQKmsFactory
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26 {
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27 private static Logger log = Logger.getLogger(WQKmsFactory.class);
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28
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29 /** Query to get km and wqs for wst_id and column_pos. */
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30 public static final String SQL_SELECT_WQS =
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31 "SELECT position, w, q FROM wst_value_table " +
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32 "WHERE wst_id = :wst_id AND column_pos = :column_pos";
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33
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34 /** Query to get name for wst_id and column_pos. */
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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 /** Hidden constructor, use static methods instead. */
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42 private WQKmsFactory() {
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43 ;
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44 }
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45
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46
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47 /**
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48 * Get WKms for given column and wst_id, caring about the cache.
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49 */
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50 public static WQKms getWQKms(int column, int wst_id) {
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51 log.debug("WQKmsFactory.getWQKms");
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52 Cache cache = CacheFactory.getCache(StaticWQKmsCacheKey.CACHE_NAME);
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53
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54 StaticWQKmsCacheKey cacheKey;
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55
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56 if (cache != null) {
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57 cacheKey = new StaticWQKmsCacheKey(wst_id, column);
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58 Element element = cache.get(cacheKey);
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59 if (element != null) {
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60 log.debug("Got static wst values from cache");
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61 return (WQKms)element.getValue();
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62 }
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63 }
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64 else {
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65 cacheKey = null;
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66 }
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67
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68 WQKms values = getWQKmsUncached(column, wst_id);
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69
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70 if (values != null && cacheKey != null) {
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71 log.debug("Store static wst values in cache.");
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72 Element element = new Element(cacheKey, values);
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73 cache.put(element);
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74 }
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75 return values;
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76 }
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77
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78
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79 /**
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80 * Get WQKms from db.
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81 * @param column the position columns value
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82 * @param wst_id database id of the wst
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83 * @return respective WQKms.
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84 */
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85 public static WQKms getWQKmsUncached(int column, int wst_id) {
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86
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87 if (log.isDebugEnabled()) {
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88 log.debug("WQKmsFactory.getWQKmsUncached, column "
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89 + column + ", wst_id " + wst_id);
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90 }
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91
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92 WQKms wqkms = new WQKms(WKmsFactory.getWKmsName(column, wst_id));
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93
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94 Session session = SessionHolder.HOLDER.get();
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95 SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WQS)
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96 .addScalar("position", StandardBasicTypes.DOUBLE)
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97 .addScalar("w", StandardBasicTypes.DOUBLE)
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98 .addScalar("q", StandardBasicTypes.DOUBLE);
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99 sqlQuery.setInteger("wst_id", wst_id);
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100 sqlQuery.setInteger("column_pos", column);
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101
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102 List<Object []> results = sqlQuery.list();
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103
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104 double kms [] = new double[results.size()];
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105 double ws [] = new double[results.size()];
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106 double qs [] = new double[results.size()];
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107
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108 int lastColumn = Integer.MAX_VALUE;
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109
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110 for (int i = 0, N = results.size(); i < N; i++) {
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111 Object[] row = results.get(i);
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112 // add(w, q, km)
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113 wqkms.add((Double) row[1], (Double) row[2], (Double) row[0]);
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114 }
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115
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116 return wqkms;
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117 }
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118 }
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119 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org