Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WQKmsFactory.java @ 2632:7d163c2c6e6d
Improve XSL transformation for fixings overview output.
flys-artifacts/trunk@4251 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 17 Apr 2012 13:55:50 +0000 |
parents | 6f047a407f84 |
children | 5642a83420f2 |
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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 * Get WKms for given column and wst_id, caring about the cache. |
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48 */ |
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49 public static WQKms getWQKms(int column, int wst_id) { |
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50 log.debug("WQKmsFactory.getWQKms"); |
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51 Cache cache = CacheFactory.getCache(StaticWQKmsCacheKey.CACHE_NAME); |
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52 |
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53 StaticWQKmsCacheKey cacheKey; |
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54 |
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55 if (cache != null) { |
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56 cacheKey = new StaticWQKmsCacheKey(wst_id, column); |
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57 Element element = cache.get(cacheKey); |
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58 if (element != null) { |
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59 log.debug("Got static wst values from cache"); |
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60 return (WQKms)element.getValue(); |
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61 } |
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62 } |
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63 else { |
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64 cacheKey = null; |
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65 } |
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66 |
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67 WQKms values = getWQKmsUncached(column, wst_id); |
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68 |
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69 if (values != null && cacheKey != null) { |
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70 log.debug("Store static wst values in cache."); |
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71 Element element = new Element(cacheKey, values); |
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72 cache.put(element); |
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73 } |
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74 return values; |
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75 } |
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76 |
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77 |
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78 /** |
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79 * Get WQKms from db. |
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80 * @param column the position columns value |
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81 * @param wst_id database id of the wst |
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82 * @return respective WQKms. |
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83 */ |
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84 public static WQKms getWQKmsUncached(int column, int wst_id) { |
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85 |
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86 if (log.isDebugEnabled()) { |
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87 log.debug("WQKmsFactory.getWQKmsUncached, column " |
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88 + column + ", wst_id " + wst_id); |
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89 } |
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90 |
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91 WQKms wqkms = new WQKms(WKmsFactory.getWKmsName(column, wst_id)); |
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92 |
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93 Session session = SessionHolder.HOLDER.get(); |
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94 SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WQS) |
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95 .addScalar("position", StandardBasicTypes.DOUBLE) |
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96 .addScalar("w", StandardBasicTypes.DOUBLE) |
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97 .addScalar("q", StandardBasicTypes.DOUBLE); |
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98 sqlQuery.setInteger("wst_id", wst_id); |
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99 sqlQuery.setInteger("column_pos", column); |
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100 |
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101 List<Object []> results = sqlQuery.list(); |
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102 |
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103 int lastColumn = Integer.MAX_VALUE; |
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104 |
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105 for (int i = 0, N = results.size(); i < N; i++) { |
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106 Object[] row = results.get(i); |
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107 // add(w, q, km) |
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108 wqkms.add((Double) row[1], (Double) row[2], (Double) row[0]); |
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109 } |
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110 |
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111 return wqkms; |
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112 } |
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113 } |
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114 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |