Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WstValueTableFactory.java @ 443:5d65fe4c08d5
Separated the WST table loading logic from the calculations.
flys-artifacts/trunk@1931 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 17 May 2011 08:55:38 +0000 |
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children | 523a256451cd |
rev | line source |
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443
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Separated the WST table loading logic from the calculations.
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1 package de.intevation.flys.artifacts.model; |
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2 |
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3 import java.io.Serializable; |
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4 |
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5 import java.util.ArrayList; |
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6 import java.util.Comparator; |
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7 import java.util.List; |
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8 import java.util.Collections; |
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9 |
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10 import org.hibernate.Session; |
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11 import org.hibernate.Query; |
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12 import org.hibernate.SQLQuery; |
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13 |
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14 import org.hibernate.type.StandardBasicTypes; |
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15 |
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16 import net.sf.ehcache.Cache; |
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17 import net.sf.ehcache.Element; |
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18 |
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19 import org.apache.log4j.Logger; |
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20 |
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21 import de.intevation.flys.model.River; |
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22 import de.intevation.flys.model.Wst; |
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23 import de.intevation.flys.model.WstColumn; |
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24 |
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25 import de.intevation.flys.artifacts.cache.CacheFactory; |
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26 |
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27 import de.intevation.flys.backend.SessionHolder; |
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28 |
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29 public class WstValueTableFactory |
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30 { |
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31 private static Logger log = Logger.getLogger(WstValueTableFactory.class); |
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32 |
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33 public static final String CACHE_NAME = "wst-value-table"; |
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34 |
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35 // TODO: put this into a property file |
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36 public static final String SQL_POS_WQ = |
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37 "SELECT position, w, q, column_pos" + |
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38 " FROM wst_value_table" + |
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39 " WHERE wst_id = :wst_id"; |
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40 |
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41 public static final class CacheKey |
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42 implements Serializable |
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43 { |
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44 private int riverId; |
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45 private int kind; |
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46 |
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47 public CacheKey(int riverId, int kind) { |
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48 this.riverId = riverId; |
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49 this.kind = kind; |
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50 } |
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51 |
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52 public int hashCode() { |
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53 return (riverId << 8) | kind; |
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54 } |
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55 |
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56 public boolean equals(Object other) { |
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57 if (!(other instanceof CacheKey)) { |
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58 return false; |
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59 } |
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60 CacheKey o = (CacheKey)other; |
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61 return riverId == o.riverId && kind == o.kind; |
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62 } |
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63 } // class CacheKey |
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64 |
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65 private WstValueTableFactory() { |
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66 } |
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67 |
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68 public static WstValueTable getTable(River river) { |
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69 return getTable(river, 0); |
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70 } |
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71 |
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72 public static WstValueTable getTable(River river, int kind) { |
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73 |
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74 Cache cache = CacheFactory.getCache(CACHE_NAME); |
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75 |
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76 CacheKey cacheKey; |
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77 |
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78 if (cache != null) { |
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79 cacheKey = new CacheKey(river.getId(), kind); |
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80 Element element = cache.get(cacheKey); |
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81 if (element != null) { |
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82 log.debug("got wst value table from cache"); |
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83 return (WstValueTable)element.getValue(); |
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84 } |
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85 } |
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86 else { |
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87 cacheKey = null; |
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88 } |
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89 |
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90 WstValueTable valueTable = getTableUncached(river, kind); |
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91 |
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92 if (cacheKey != null) { |
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93 log.debug("store wst value table in cache"); |
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94 Element element = new Element(cacheKey, valueTable); |
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95 cache.put(element); |
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96 } |
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97 |
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98 return valueTable; |
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99 } |
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100 |
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101 public static WstValueTable getTableUncached(River river, int kind) { |
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102 |
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103 Session session = SessionHolder.HOLDER.get(); |
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104 |
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105 Query query = session.createQuery( |
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106 "from Wst where river=:river and kind=:kind"); |
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107 query.setParameter("river", river); |
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108 query.setInteger("kind", kind); |
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109 |
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110 List<Wst> wsts = query.list(); |
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111 |
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112 if (wsts.isEmpty()) { |
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113 return null; |
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114 } |
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115 |
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116 Wst wst = wsts.get(0); |
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117 |
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118 // TODO: Do this sorting at database level |
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119 List<WstColumn> wstColumns = new ArrayList(wst.getColumns()); |
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120 Collections.sort(wstColumns, new Comparator<WstColumn>() { |
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121 public int compare(WstColumn a, WstColumn b) { |
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122 int pa = a.getPosition(); |
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123 int pb = b.getPosition(); |
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124 if (pa < pb) return -1; |
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125 if (pa > pb) return +1; |
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126 return 0; |
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127 } |
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128 }); |
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129 |
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130 WstValueTable.Column [] columns = |
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131 new WstValueTable.Column[wstColumns.size()]; |
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132 |
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133 for (int i = 0; i < columns.length; ++i) { |
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134 columns[i] = new WstValueTable.Column(wstColumns.get(i).getName()); |
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135 } |
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136 |
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137 // using native SQL here to avoid myriad of small objects. |
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138 SQLQuery sqlQuery = session.createSQLQuery(SQL_POS_WQ) |
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139 .addScalar("position", StandardBasicTypes.DOUBLE) |
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140 .addScalar("w", StandardBasicTypes.DOUBLE) |
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141 .addScalar("q", StandardBasicTypes.DOUBLE) |
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142 .addScalar("column_pos", StandardBasicTypes.INTEGER); |
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143 |
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144 sqlQuery.setInteger("wst_id", wst.getId()); |
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145 |
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146 WstValueTable valueTable = new WstValueTable(columns); |
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147 |
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148 int lastColumnNo = -1; |
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149 WstValueTable.Row row = null; |
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150 |
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151 Double lastQ = -Double.MAX_VALUE; |
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152 boolean qSorted = true; |
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153 |
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154 for (Object r: sqlQuery.list()) { |
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155 Object[] result = (Object[]) r; |
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156 |
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157 double km = (Double) result[0]; |
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158 Double w = (Double) result[1]; |
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159 Double q = (Double) result[2]; |
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160 int columnNo = (Integer)result[3]; |
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161 |
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162 if (columnNo > lastColumnNo) { // new row |
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163 if (row != null) { |
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164 row.qSorted = qSorted; |
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165 valueTable.rows.add(row); |
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166 } |
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167 row = new WstValueTable.Row( |
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168 km, |
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169 new double[columnNo+1], |
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170 new double[columnNo+1]); |
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171 lastQ = -Double.MAX_VALUE; |
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172 qSorted = true; |
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173 } |
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174 |
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175 row.ws[columnNo] = w != null ? w : Double.NaN; |
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176 row.qs[columnNo] = q != null ? q : Double.NaN; |
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177 |
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178 if (qSorted && (q == null || lastQ > q)) { |
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179 qSorted = false; |
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180 } |
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181 lastQ = q; |
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182 |
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183 lastColumnNo = columnNo; |
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184 } |
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185 |
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186 if (row != null) { |
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187 valueTable.rows.add(row); |
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188 } |
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189 |
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190 return valueTable; |
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191 } |
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192 } |
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193 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |