Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/CrossSectionKMService.java @ 2227:2e6f0ef36352
Added a new constructor to Timerange that takes Date objects for start and end.
flys-artifacts/trunk@3867 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 01 Feb 2012 14:43:50 +0000 |
parents | f021080cb409 |
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1 package de.intevation.flys.artifacts.services; |
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2 |
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3 import de.intevation.artifacts.CallMeta; |
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4 import de.intevation.artifacts.GlobalContext; |
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5 |
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6 import de.intevation.artifacts.common.utils.XMLUtils; |
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7 |
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8 import de.intevation.flys.artifacts.cache.CacheFactory; |
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9 |
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10 import de.intevation.flys.backend.SessionHolder; |
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11 |
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12 import de.intevation.flys.model.CrossSection; |
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13 import de.intevation.flys.model.CrossSectionLine; |
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14 |
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15 import java.util.AbstractMap; |
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16 import java.util.ArrayDeque; |
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17 import java.util.Deque; |
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18 import java.util.List; |
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19 import java.util.Map; |
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20 import java.util.NavigableMap; |
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21 |
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22 import java.util.concurrent.ConcurrentSkipListMap; |
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23 |
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24 import net.sf.ehcache.Cache; |
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25 |
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26 import org.apache.log4j.Logger; |
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27 |
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28 import org.hibernate.Query; |
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29 import org.hibernate.Session; |
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30 |
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31 import org.w3c.dom.Document; |
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32 import org.w3c.dom.Element; |
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33 import org.w3c.dom.NodeList; |
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34 |
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35 |
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36 /** |
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37 * Service to find the next/previous km (measurement) of cross sections. |
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38 * Looking at the query for a single cross-section id at a single km, the |
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39 * service does the following: |
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40 * |
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41 * It returns the km itself if a measurement at that km was found and |
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42 * the N nearest other measurement points in both directions. |
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43 * |
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44 * That means, you can pass N=0 to find out whether a measurement at given km |
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45 * exists. |
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46 * |
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47 * If less than N neighbours exist in one direction, less are delivered |
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48 * (e.g. given measurements at [0,2,3,4,5,7,8,9] a query for km=8, N=3 will |
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49 * result in [4,5,7,8,9]). |
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50 */ |
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51 public class CrossSectionKMService |
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52 extends FLYSService |
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53 { |
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54 private static Logger logger = |
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55 Logger.getLogger(CrossSectionKMService.class); |
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56 |
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57 public static final String CACHE_NAME = "cross-section-kms"; |
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58 |
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59 |
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60 /** Trivial constructor. */ |
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61 public CrossSectionKMService() { |
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62 } |
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63 |
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64 |
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65 /** |
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66 * @param data |
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67 */ |
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68 @Override |
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69 public Document doProcess( |
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70 Document data, |
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71 GlobalContext globalContext, |
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72 CallMeta callMeta |
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73 ) { |
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74 logger.debug("CrossSectionKMService.doProcess"); |
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75 |
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76 NodeList crossSectionNodes = |
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77 data.getElementsByTagName("art:cross-section"); |
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78 |
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79 Document document = XMLUtils.newDocument(); |
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80 |
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81 Element all = document.createElement("cross-sections"); |
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82 |
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83 for (int i = 0, CS = crossSectionNodes.getLength(); i < CS; ++i) { |
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84 Element crossSectionElement = (Element)crossSectionNodes.item(i); |
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85 |
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86 String idString = crossSectionElement.getAttribute("id"); |
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87 String kmString = crossSectionElement.getAttribute("km"); |
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88 String neighborsString = crossSectionElement.getAttribute("n"); |
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89 |
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90 if (idString.length() == 0 || kmString.length() == 0) { |
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91 logger.debug("missing attributes in cross-section element"); |
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92 continue; |
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93 } |
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94 |
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95 double km; |
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96 Integer crossSectionId; |
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97 int N = 2; |
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98 |
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99 try { |
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100 km = Double.parseDouble(kmString); |
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101 crossSectionId = Integer.valueOf(idString); |
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102 |
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103 if (neighborsString.length() > 0) { |
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104 N = Integer.parseInt(neighborsString); |
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105 } |
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106 } |
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107 catch (NumberFormatException nfe) { |
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108 logger.debug("converting number failed", nfe); |
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109 continue; |
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110 } |
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111 |
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112 NavigableMap<Double, Integer> map = getKms(crossSectionId); |
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113 |
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114 if (map == null) { |
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115 logger.debug("cannot find cross section " + crossSectionId); |
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116 continue; |
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117 } |
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118 |
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119 Deque<Map.Entry<Double, Integer>> result = |
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120 nearestNeighbors(map, km, N); |
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121 |
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122 if (!result.isEmpty()) { |
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123 Element csE = document.createElement("cross-section"); |
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124 csE.setAttribute("id", idString); |
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125 for (Map.Entry<Double, Integer> entry: result) { |
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126 Element lineE = document.createElement("line"); |
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127 lineE.setAttribute( |
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128 "line-id", String.valueOf(entry.getValue())); |
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129 lineE.setAttribute( |
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130 "km", String.valueOf(entry.getKey())); |
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131 csE.appendChild(lineE); |
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132 } |
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133 all.appendChild(csE); |
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134 } |
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135 } |
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136 |
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137 document.appendChild(all); |
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138 |
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139 return document; |
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140 } |
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141 |
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142 public static NavigableMap<Double, Integer> getKms(int crossSectionId) { |
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143 |
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144 Cache cache = CacheFactory.getCache(CACHE_NAME); |
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145 |
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146 if (cache == null) { |
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147 return getUncached(crossSectionId); |
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148 } |
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149 |
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150 NavigableMap<Double, Integer> map; |
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151 |
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152 net.sf.ehcache.Element element = cache.get(crossSectionId); |
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153 if (element == null) { |
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154 map = getUncached(crossSectionId); |
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155 if (map != null) { |
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156 element = new net.sf.ehcache.Element( |
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157 crossSectionId, map); |
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158 cache.put(element); |
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159 } |
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160 } |
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161 else { |
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162 map = (NavigableMap<Double, Integer>)element.getValue(); |
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163 } |
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164 |
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165 return map; |
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166 } |
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167 |
1961
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168 |
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169 /** |
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170 * @param km the kilometer from which to start searching for other |
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171 * measurements |
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172 * @param N number of neighboring measurements to find. |
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173 */ |
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174 public static Deque<Map.Entry<Double, Integer>> nearestNeighbors( |
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175 NavigableMap<Double, Integer> map, |
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176 double km, |
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177 int N |
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178 ) { |
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179 Deque<Map.Entry<Double, Integer>> result = |
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180 new ArrayDeque<Map.Entry<Double, Integer>>(2*N); |
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181 |
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182 Integer v = map.get(km); |
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183 |
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184 if (v != null) { |
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185 result.add(new AbstractMap.SimpleEntry<Double, Integer>(km, v)); |
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186 } |
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187 |
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188 int i = 0; |
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189 for (Map.Entry<Double, Integer> entry: |
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190 map.headMap(km, false).descendingMap().entrySet()) { |
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191 if (i++ >= N) { |
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192 break; |
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193 } |
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194 result.addFirst(entry); |
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195 } |
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196 |
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197 i = 0; |
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198 for (Map.Entry<Double, Integer> entry: |
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199 map.tailMap(km, false).entrySet()) { |
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200 if (i++ >= N) { |
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201 break; |
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202 } |
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203 result.addLast(entry); |
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204 } |
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205 |
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206 return result; |
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207 } |
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208 |
1961
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209 |
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210 /** |
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211 * @param crossSectionId id of queried cross-section (in db). |
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212 * @return Mapping from kilometer to db-id. |
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213 */ |
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214 public static NavigableMap<Double, Integer> getUncached( |
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215 Integer crossSectionId |
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216 ) { |
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217 NavigableMap<Double, Integer> result = |
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218 new ConcurrentSkipListMap<Double, Integer>(); |
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219 |
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220 Session session = SessionHolder.HOLDER.get(); |
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221 Query query = session.createQuery( |
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222 "from CrossSection where id=:id"); |
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223 query.setParameter("id", crossSectionId); |
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224 |
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225 List<CrossSection> crossSections = query.list(); |
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226 if (crossSections.isEmpty()) { |
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227 return null; |
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228 } |
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229 |
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230 CrossSection crossSection = crossSections.get(0); |
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231 List<CrossSectionLine> lines = crossSection.getLines(); |
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232 |
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233 for (CrossSectionLine line: lines) { |
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234 Double km = line.getKm().doubleValue(); |
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235 Integer id = line.getId(); |
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236 result.put(km, id); |
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237 } |
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238 |
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239 return result; |
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240 } |
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241 } |
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242 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |