Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/HYKFactory.java @ 2148:345a236f7075

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Made HYKFactory.Zone Serializable (and thus cachable). flys-artifacts/trunk@3730 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 20 Jan 2012 08:30:07 +0000
parents 923256599afe
children 8c9c40459d8f
rev   line source
2131
e50a928187cd Added stubby hyk infrastructure.
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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.HYKFormation;
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19 import de.intevation.flys.model.HYKFlowZone;
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20
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21 import de.intevation.flys.artifacts.cache.CacheFactory;
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22
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23 import de.intevation.flys.backend.SessionHolder;
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24
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25
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26 /**
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27 * Factory to access HYKs (hydrographic values).
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28 */
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29 public class HYKFactory
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30 {
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31 private static Logger logger = Logger.getLogger(HYKFactory.class);
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32
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33 public static String HYK_CACHE_NAME = "hykache";
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34
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35
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36 /** Do not instantiate a HYKFactory. */
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37 private HYKFactory() {
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38 }
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39
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40
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41 /**
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42 * Get List of Zones for given river and km.
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43 */
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44 public static Object getHYKs(int hykid, double km) {
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45 logger.debug("HYKFactory.getHYKs");
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46
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47 Cache cache = CacheFactory.getCache(HYK_CACHE_NAME);
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48
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49 String cacheKey;
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50
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51 if (cache != null) {
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52 cacheKey = "" + hykid + "_" + km;
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53 Element element = cache.get(cacheKey);
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54 if (element != null) {
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55 logger.debug("Got hyk from cache");
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56 return (List<Zone>)element.getValue();
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57 }
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58 }
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59 else {
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60 cacheKey = null;
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61 }
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62
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63 List<Zone> zones = getZonesUncached(hykid, km);
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64
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65 if (zones != null && cacheKey != null) {
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66 logger.debug("Store hykzones in cache.");
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67 Element element = new Element(cacheKey, zones);
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68 cache.put(element);
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69 }
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70
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71 return zones;
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72 }
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73
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74
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75 public static String getHykName(int hykid) {
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76 logger.debug("HYKFactory.getHykName " + hykid);
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77
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78 Session session = SessionHolder.HOLDER.get();
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79
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80 // TODO respect interval better. respect multiples (sort, limit),
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81 // TODO respect flow direction of river.
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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 *
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92 * @param column the position columns value
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93 * @param wst_id database id of the wst
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94 * @return according WKms.
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95 */
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96 // TODO we also need to know the HYK-id to specify which set we are
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97 // inspecting.
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98 public static List<Zone> getZonesUncached(int hykid, double km) {
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99
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100 if (logger.isDebugEnabled()) {
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101 logger.debug("HYKFactory.getZoneUncached " + hykid + " km " + km);
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102 }
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103
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104 Session session = SessionHolder.HOLDER.get();
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105
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106 // TODO respect interval better. respect multiples (sort, limit),
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107 // TODO respect flow direction of river.
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108 Query query = session.createQuery(
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109 "from HYKFormation where entry.HYK.id = :hykid " +
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110 " and :km between entry.km - cast(distance_vl/1000.0 + 0.001 as big_decimal) and " +
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111 " entry.km + cast(distance_vl/1000.0 + 0.001 as big_decimal)" +
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112 " order by entry.km asc");
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113 query.setParameter("hykid", hykid);
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114 query.setParameter("km", new BigDecimal(km));
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115
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116 List<HYKFormation> forms = query.list();
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117
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118 List<Zone> zones = new ArrayList<Zone>();
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119 // TODO limit query by one; sensible sorting.
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120 // Take the first one.
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121 if (forms.size() >= 1) {
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122 HYKFormation form = forms.get(0);
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123 // Create respective zones.
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124 for (HYKFlowZone flowZone: form.getZones()) {
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125 Zone z = new Zone(flowZone.getA().doubleValue(),
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126 flowZone.getB().doubleValue(),
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127 flowZone.getType().getName());
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128 zones.add(z);
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129 }
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130 }
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131
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132 return zones;
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133 }
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134
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135 /** Labelled section. */
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136 public static class Zone implements Serializable {
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137 /** Lower end of segment. */
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138 protected double from;
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139 /** Upper end of segment. */
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140 protected double to;
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141 /** The label. */
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142 protected String name;
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143
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144 /** Constructor for labelled section. */
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145 public Zone (double from, double to, String name) {
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146 this.from = from;
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147 this.to = to;
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148 this.name = name;
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149 }
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150
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151 /** Get upper value. */
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152 public double getTo() {
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153 return to;
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154 }
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155
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156 /** Get lower value. */
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157 public double getFrom() {
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158 return from;
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159 }
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160
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161 /** Get name (type). */
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162 public String getName() {
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163 return name;
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164 }
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165 } // public static class Zone
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166 }
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167 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org