Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/CrossSectionKMService.java @ 1749:f7d890f4855f

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Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms. flys-artifacts/trunk@3049 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 20 Oct 2011 17:14:24 +0000
parents
children 4781096f31f8
rev   line source
1749
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>
parents:
diff changeset
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.ArrayDeque;
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16 import java.util.Deque;
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17 import java.util.List;
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18 import java.util.Map;
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19 import java.util.NavigableMap;
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20
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21 import java.util.concurrent.ConcurrentSkipListMap;
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22
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23 import net.sf.ehcache.Cache;
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24
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25 import org.apache.log4j.Logger;
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26
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27 import org.hibernate.Query;
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28 import org.hibernate.Session;
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29
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30 import org.w3c.dom.Document;
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31 import org.w3c.dom.Element;
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32 import org.w3c.dom.NodeList;
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33
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34 public class CrossSectionKMService
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35 extends FLYSService
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36 {
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37 private static Logger logger =
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38 Logger.getLogger(CrossSectionKMService.class);
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39
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40 public static final String CACHE_NAME = "cross-section-kms";
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41
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42 public CrossSectionKMService() {
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43 }
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44
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45 @Override
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46 public Document doProcess(
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47 Document data,
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48 GlobalContext globalContext,
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49 CallMeta callMeta
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50 ) {
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51 logger.debug("CrossSectionKMService.doProcess");
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52
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53 NodeList crossSectionNodes =
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54 data.getElementsByTagName("cross-section");
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55
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56 Cache cache = CacheFactory.getCache(CACHE_NAME);
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57
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58 Document document = XMLUtils.newDocument();
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59
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60 Element all = document.createElement("cross-sections");
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61
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62 for (int i = 0, CS = crossSectionNodes.getLength(); i < CS; ++i) {
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63 Element crossSectionElement = (Element)crossSectionNodes.item(i);
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64
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65 String idString = crossSectionElement.getAttribute("id");
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66 String kmString = crossSectionElement.getAttribute("km");
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67 String neighborsString = crossSectionElement.getAttribute("n");
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68
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69 if (idString.length() == 0 || kmString.length() == 0) {
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70 logger.debug("missing attributes in cross-section element");
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71 continue;
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72 }
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73
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74 double km;
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75 Integer crossSectionId;
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76 int N = 2;
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77
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78 try {
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79 km = Double.parseDouble(kmString);
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80 crossSectionId = Integer.valueOf(idString);
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81
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82 if (neighborsString.length() > 0) {
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83 N = Integer.parseInt(neighborsString);
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84 }
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85 }
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86 catch (NumberFormatException nfe) {
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87 logger.debug("converting number failed", nfe);
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88 continue;
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89 }
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90
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91 NavigableMap<Double, Integer> map;
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92
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93 if (cache == null) {
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94 map = getUncached(crossSectionId);
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95 }
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96 else {
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97 net.sf.ehcache.Element element = cache.get(crossSectionId);
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98 if (element == null) {
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99 map = getUncached(crossSectionId);
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100 if (map != null) {
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101 element = new net.sf.ehcache.Element(
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102 crossSectionId, map);
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103 cache.put(element);
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104 }
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105 }
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diff changeset
106 else {
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107 map = (NavigableMap<Double, Integer>)element.getValue();
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108 }
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109 }
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110
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111 if (map == null) {
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112 logger.debug("cannot find cross section " + crossSectionId);
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113 continue;
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114 }
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115
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116 Deque<Map.Entry<Double, Integer>> result =
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117 nearestNeighbors(map, km, N);
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118
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119 if (!result.isEmpty()) {
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120 Element csE = document.createElement("cross-section");
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121 csE.setAttribute("id", idString);
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122 for (Map.Entry<Double, Integer> entry: result) {
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123 Element lineE = document.createElement("line");
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124 lineE.setAttribute(
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125 "line-id", String.valueOf(entry.getValue()));
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126 lineE.setAttribute(
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127 "km", String.valueOf(entry.getKey()));
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128 csE.appendChild(lineE);
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129 }
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130 all.appendChild(csE);
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131 }
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132 }
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133
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134 document.appendChild(all);
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135
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136 return document;
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137 }
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138
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139 public static Deque<Map.Entry<Double, Integer>> nearestNeighbors(
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140 NavigableMap<Double, Integer> map,
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141 double km,
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142 int N
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143 ) {
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144 Deque<Map.Entry<Double, Integer>> result =
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145 new ArrayDeque<Map.Entry<Double, Integer>>(2*N);
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146
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147 int i = 0;
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148 for (Map.Entry<Double, Integer> entry:
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149 map.headMap(km, false).descendingMap().entrySet()) {
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150 if (i++ >= N) {
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151 break;
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152 }
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153 result.addFirst(entry);
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154 }
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155
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156 i = 0;
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157 for (Map.Entry<Double, Integer> entry:
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158 map.tailMap(km, false).entrySet()) {
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159 if (i++ >= N) {
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160 break;
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161 }
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diff changeset
162 result.addLast(entry);
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163 }
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164
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165 return result;
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166 }
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167
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168 public static NavigableMap<Double, Integer> getUncached(
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169 Integer crossSectionId
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170 ) {
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171 NavigableMap<Double, Integer> result =
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diff changeset
172 new ConcurrentSkipListMap<Double, Integer>();
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173
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diff changeset
174 Session session = SessionHolder.HOLDER.get();
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diff changeset
175 Query query = session.createQuery(
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diff changeset
176 "from CrossSection where id=:id");
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diff changeset
177 query.setParameter("id", crossSectionId);
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178
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179 List<CrossSection> crossSections = query.list();
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diff changeset
180 if (crossSections.isEmpty()) {
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parents:
diff changeset
181 return null;
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diff changeset
182 }
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183
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184 CrossSection crossSection = crossSections.get(0);
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diff changeset
185 List<CrossSectionLine> lines = crossSection.getLines();
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186
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diff changeset
187 for (CrossSectionLine line: lines) {
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diff changeset
188 Double km = line.getKm().doubleValue();
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diff changeset
189 Integer id = line.getId();
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diff changeset
190 result.put(km, id);
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parents:
diff changeset
191 }
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diff changeset
192
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parents:
diff changeset
193 return result;
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diff changeset
194 }
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195 }
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196 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org