Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/CrossSectionKMService.java @ 5546:5b50247d4d99

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use latin1 as encoding in the dgm importer to make it easier matching latin1 csv values
author Andre Heinecke <aheinecke@intevation.de>
date Thu, 04 Apr 2013 10:23:17 +0200
parents f021080cb409
children
rev   line source
1749
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
2120
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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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diff changeset
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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diff changeset
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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parents: 1973
diff changeset
156 element = new net.sf.ehcache.Element(
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parents: 1973
diff changeset
157 crossSectionId, map);
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diff changeset
158 cache.put(element);
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diff changeset
159 }
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diff changeset
160 }
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diff changeset
161 else {
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diff changeset
162 map = (NavigableMap<Double, Integer>)element.getValue();
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163 }
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diff changeset
164
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165 return map;
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diff changeset
166 }
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diff changeset
167
1961
4781096f31f8 Mainly documentation.
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168
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169 /**
4781096f31f8 Mainly documentation.
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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 */
1749
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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
2120
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diff changeset
182 Integer v = map.get(km);
1961
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183
2120
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diff changeset
184 if (v != null) {
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parents: 1973
diff changeset
185 result.add(new AbstractMap.SimpleEntry<Double, Integer>(km, v));
1961
4781096f31f8 Mainly documentation.
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186 }
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187
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188 int i = 0;
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diff changeset
189 for (Map.Entry<Double, Integer> entry:
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diff changeset
190 map.headMap(km, false).descendingMap().entrySet()) {
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parents:
diff changeset
191 if (i++ >= N) {
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parents:
diff changeset
192 break;
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parents:
diff changeset
193 }
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parents:
diff changeset
194 result.addFirst(entry);
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195 }
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parents:
diff changeset
196
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parents:
diff changeset
197 i = 0;
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
198 for (Map.Entry<Double, Integer> entry:
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parents:
diff changeset
199 map.tailMap(km, false).entrySet()) {
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
200 if (i++ >= N) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
201 break;
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parents:
diff changeset
202 }
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parents:
diff changeset
203 result.addLast(entry);
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parents:
diff changeset
204 }
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diff changeset
205
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parents:
diff changeset
206 return result;
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
207 }
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diff changeset
208
1961
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diff changeset
209
4781096f31f8 Mainly documentation.
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parents: 1749
diff changeset
210 /**
4781096f31f8 Mainly documentation.
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parents: 1749
diff changeset
211 * @param crossSectionId id of queried cross-section (in db).
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parents: 1749
diff changeset
212 * @return Mapping from kilometer to db-id.
4781096f31f8 Mainly documentation.
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parents: 1749
diff changeset
213 */
1749
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parents:
diff changeset
214 public static NavigableMap<Double, Integer> getUncached(
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
215 Integer crossSectionId
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parents:
diff changeset
216 ) {
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
217 NavigableMap<Double, Integer> result =
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
218 new ConcurrentSkipListMap<Double, Integer>();
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parents:
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219
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parents:
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(
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
222 "from CrossSection where id=:id");
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parents:
diff changeset
223 query.setParameter("id", crossSectionId);
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
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()) {
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
227 return null;
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parents:
diff changeset
228 }
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parents:
diff changeset
229
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parents:
diff changeset
230 CrossSection crossSection = crossSections.get(0);
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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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