Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WKmsFactory.java @ 4051:58bdf95df5e4

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More dead code removal. Minor code clean ups.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sat, 06 Oct 2012 13:19:44 +0200
parents cd5eb8f5f6f1
children
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.cache.CacheFactory;
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16
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17 import de.intevation.flys.backend.SessionHolder;
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18
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19
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20 /**
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21 * Factory to access ready-made WKms for other (than computed) 'kinds' of
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22 * WST-data.
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23 */
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24 public class WKmsFactory
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25 {
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26 /** Private logger to use here. */
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27 private static Logger log = Logger.getLogger(WKmsFactory.class);
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28
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29 /** Query to get km and ws for wst_id and column_pos. */
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30 public static final String SQL_SELECT_WS =
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31 "SELECT km, w FROM wst_w_values " +
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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 /** Query to get name (description) for wst_id. */
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41 public static final String SQL_SELECT_WST_NAME =
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42 "SELECT description from wsts "+
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43 "WHERE id = :wst_id";
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44
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45
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46 private WKmsFactory() {
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47 }
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48
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49
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50 /**
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51 * Get WKms for given column and wst_id, caring about the cache.
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52 */
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53 public static WKms getWKms(int column, int wst_id) {
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54 log.debug("WKmsFactory.getWKms");
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55 Cache cache = CacheFactory.getCache(StaticWKmsCacheKey.CACHE_NAME);
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56
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57 StaticWKmsCacheKey cacheKey;
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58
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59 if (cache != null) {
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60 cacheKey = new StaticWKmsCacheKey(wst_id, column);
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61 Element element = cache.get(cacheKey);
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62 if (element != null) {
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63 log.debug("Got static wst values from cache");
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64 return (WKms)element.getValue();
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65 }
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66 }
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67 else {
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68 cacheKey = null;
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69 }
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70
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71 WKms values = getWKmsUncached(column, wst_id);
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72
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73 if (values != null && cacheKey != null) {
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74 log.debug("Store static wst values in cache.");
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75 Element element = new Element(cacheKey, values);
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76 cache.put(element);
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77 }
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78 return values;
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79 }
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80
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81 /** Get name for a WKms. */
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82 public static String getWKmsName(int wst_id) {
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83 log.debug("WKmsFactory.getWKmsName wst_id/" + wst_id);
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84
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85 String name = null;
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86 Session session = SessionHolder.HOLDER.get();
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87
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88 SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_WST_NAME)
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89 .addScalar("description", StandardBasicTypes.STRING);
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90 nameQuery.setInteger("wst_id", wst_id);
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91
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92 List<String> names = nameQuery.list();
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93 if (names.size() >= 1) {
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94 name = names.get(0);
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95 }
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96
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97 return name;
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98 }
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99
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100 /** Get name for a WKms. */
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101 public static String getWKmsName(int column, int wst_id) {
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102 log.debug("WKmsFactory.getWKmsName c/" + column + ", wst_id/" + wst_id);
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103
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104 String name = null;
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105 Session session = SessionHolder.HOLDER.get();
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106
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107 SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_NAME)
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108 .addScalar("name", StandardBasicTypes.STRING);
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109 nameQuery.setInteger("wst_id", wst_id);
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110 nameQuery.setInteger("column_pos", column);
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111
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112 List<String> names = nameQuery.list();
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113 if (names.size() >= 1) {
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114 name = names.get(0);
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115 }
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116
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117 return name;
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118 }
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119
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120
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121 /**
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122 * Get WKms from db.
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123 * @param column the position columns value
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124 * @param wst_id database id of the wst
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125 * @return according WKms.
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126 */
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127 public static WKms getWKmsUncached(int column, int wst_id) {
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128
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129 if (log.isDebugEnabled()) {
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130 log.debug("WKmsFactory.getWKmsUncached c/" + column + ", wst_id/" + wst_id);
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131 }
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132
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133 WKmsImpl wkms = new WKmsImpl(getWKmsName(column, wst_id));
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134
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135 Session session = SessionHolder.HOLDER.get();
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136 SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WS)
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137 .addScalar("km", StandardBasicTypes.DOUBLE)
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138 .addScalar("w", StandardBasicTypes.DOUBLE);
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139 sqlQuery.setInteger("wst_id", wst_id);
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140 sqlQuery.setInteger("column_pos", column);
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141
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142 List<Object []> results = sqlQuery.list();
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143
1796
ae6ace900c07 Small loop optimization
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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144 for (int i = 0, N = results.size(); i < N; i++) {
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145 Object[] row = results.get(i);
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146 wkms.add((Double) row[0], (Double) row[1]);
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147 }
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148
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149 return wkms;
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150 }
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Felix Wolfsteller <felix.wolfsteller@intevation.de>
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151 }
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Felix Wolfsteller <felix.wolfsteller@intevation.de>
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152 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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