Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/CrossSectionKMService.java @ 3082:9e03960b3ab8

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FixA: Lowered log level in parameter interpolation. flys-artifacts/trunk@4678 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 18 Jun 2012 08:10:44 +0000
parents f021080cb409
children
rev   line source
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f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
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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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diff changeset
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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diff changeset
154 map = getUncached(crossSectionId);
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diff changeset
155 if (map != null) {
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diff changeset
156 element = new net.sf.ehcache.Element(
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diff changeset
157 crossSectionId, map);
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diff changeset
158 cache.put(element);
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159 }
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diff changeset
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
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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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diff changeset
185 result.add(new AbstractMap.SimpleEntry<Double, Integer>(km, v));
1961
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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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diff changeset
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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diff changeset
200 if (i++ >= N) {
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diff changeset
201 break;
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202 }
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diff changeset
203 result.addLast(entry);
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204 }
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205
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parents:
diff changeset
206 return result;
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207 }
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208
1961
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209
4781096f31f8 Mainly documentation.
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diff changeset
210 /**
4781096f31f8 Mainly documentation.
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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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parents: 1749
diff changeset
213 */
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diff changeset
214 public static NavigableMap<Double, Integer> getUncached(
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diff changeset
215 Integer crossSectionId
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parents:
diff changeset
216 ) {
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parents:
diff changeset
217 NavigableMap<Double, Integer> result =
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parents:
diff changeset
218 new ConcurrentSkipListMap<Double, Integer>();
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219
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diff changeset
220 Session session = SessionHolder.HOLDER.get();
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
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parents:
diff changeset
221 Query query = session.createQuery(
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parents:
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222 "from CrossSection where id=:id");
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parents:
diff changeset
223 query.setParameter("id", crossSectionId);
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224
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parents:
diff changeset
225 List<CrossSection> crossSections = query.list();
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parents:
diff changeset
226 if (crossSections.isEmpty()) {
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parents:
diff changeset
227 return null;
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parents:
diff changeset
228 }
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229
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parents:
diff changeset
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 :
http://dive4elements.wald.intevation.org