Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/HYKFactory.java @ 2155:8c9c40459d8f

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Respect rivers flow direction when looking for hyk-formations. flys-artifacts/trunk@3738 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 20 Jan 2012 09:38:43 +0000
parents 345a236f7075
children 98a350bb91a9
rev   line source
2131
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1 package de.intevation.flys.artifacts.model;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import java.math.BigDecimal;
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7
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8 import java.io.Serializable;
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9
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10 import net.sf.ehcache.Cache;
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11 import net.sf.ehcache.Element;
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12
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13 import org.apache.log4j.Logger;
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14
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15 import org.hibernate.Query;
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16 import org.hibernate.Session;
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17
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18 import de.intevation.flys.model.HYK;
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19 import de.intevation.flys.model.HYKFormation;
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20 import de.intevation.flys.model.HYKFlowZone;
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21
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22 import de.intevation.flys.artifacts.cache.CacheFactory;
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23
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24 import de.intevation.flys.backend.SessionHolder;
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25
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26
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27 /**
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28 * Factory to access HYKs (hydrographic values).
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29 */
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30 public class HYKFactory
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31 {
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32 private static Logger logger = Logger.getLogger(HYKFactory.class);
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33
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34 public static String HYK_CACHE_NAME = "hykache";
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35
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36
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37 /** Do not instantiate a HYKFactory. */
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38 private HYKFactory() {
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39 }
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40
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41
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42 /**
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43 * Get List of Zones for given river and km.
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44 */
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45 public static Object getHYKs(int hykid, double km) {
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46 logger.debug("HYKFactory.getHYKs");
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47
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48 Cache cache = CacheFactory.getCache(HYK_CACHE_NAME);
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49
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50 String cacheKey;
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51
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52 if (cache != null) {
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53 cacheKey = "" + hykid + "_" + km;
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54 Element element = cache.get(cacheKey);
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55 if (element != null) {
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56 logger.debug("Got hyk from cache");
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57 return (List<Zone>)element.getValue();
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58 }
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59 }
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60 else {
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61 cacheKey = null;
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62 }
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63
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64 List<Zone> zones = getZonesUncached(hykid, km);
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65
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66 if (zones != null && cacheKey != null) {
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67 logger.debug("Store hykzones in cache.");
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68 Element element = new Element(cacheKey, zones);
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69 cache.put(element);
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70 }
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71
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72 return zones;
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73 }
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74
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75
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76 /** Return name for hyk with given id. */
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77 public static String getHykName(int hykid) {
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78 logger.debug("HYKFactory.getHykName " + hykid);
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79
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80 Session session = SessionHolder.HOLDER.get();
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81
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82 Query query = session.createQuery(
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83 "select description from HYK where id = :hykid ");
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84 query.setParameter("hykid", hykid);
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85
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86 return (String) query.uniqueResult();
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87 }
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88
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89
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90 /**
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91 * Ask DB for hyk zones.
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92 * @param hykid ID of the 'main' HYK to query.
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93 * @param km for which to get the hyk-zones.
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94 * @return according zones.
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95 */
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96 public static List<Zone> getZonesUncached(int hykid, double km) {
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97
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98 if (logger.isDebugEnabled()) {
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99 logger.debug("HYKFactory.getZoneUncached " + hykid + " km " + km);
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100 }
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101
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102 Session session = SessionHolder.HOLDER.get();
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103
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104 // Find out flow-direction of river.
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105 // OPTIMIZE: 1) query kmUp directly 2) merge queries.
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106 Query rQuery = session.createQuery("from HYK where id = :hykid");
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107 rQuery.setParameter("hykid", hykid);
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108 rQuery.setMaxResults(1);
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109 HYK hyk = (HYK) rQuery.uniqueResult();
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110 BigDecimal flowDir = (hyk.getRiver().getKmUp()) ? new BigDecimal(1) : new BigDecimal(-1);
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111
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112 // Query HYKFormations in range.
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113 Query query = session.createQuery(
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114 "from HYKFormation where entry.HYK.id = :hykid " +
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115 " and :km between entry.km and " +
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116 " entry.km + :flowDir * "+
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117 " cast(distance_vl/1000.0 + 0.001 as big_decimal)" +
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118 " order by entry.km asc");
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119 query.setParameter("hykid", hykid);
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120 query.setParameter("km", new BigDecimal(km));
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121 query.setParameter("flowDir", flowDir);
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122 query.setMaxResults(1);
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123
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124 List<HYKFormation> forms = query.list();
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125
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126 List<Zone> zones = new ArrayList<Zone>();
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127
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128 // Take the first one.
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129 if (forms.size() >= 1) {
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130 HYKFormation form = forms.get(0);
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131 // Create respective zones.
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132 for (HYKFlowZone flowZone: form.getZones()) {
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133 Zone z = new Zone(flowZone.getA().doubleValue(),
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134 flowZone.getB().doubleValue(),
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135 flowZone.getType().getName());
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136 zones.add(z);
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137 }
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138 }
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139
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140 return zones;
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141 }
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142
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143 /** Labelled section. */
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144 public static class Zone implements Serializable {
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145 /** Lower end of segment. */
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146 protected double from;
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147 /** Upper end of segment. */
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148 protected double to;
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149 /** The label. */
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150 protected String name;
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151
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152 /** Constructor for labelled section. */
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153 public Zone (double from, double to, String name) {
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154 this.from = from;
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155 this.to = to;
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156 this.name = name;
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157 }
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158
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159 /** Get upper value. */
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160 public double getTo() {
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161 return to;
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162 }
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163
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164 /** Get lower value. */
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165 public double getFrom() {
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166 return from;
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167 }
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168
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169 /** Get name (type). */
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170 public String getName() {
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171 return name;
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172 }
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173 } // public static class Zone
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174 }
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175 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org