Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/CrossSectionKMService.java @ 1775:0156105222c9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Improved the MapfileGenerator. It offers methods to create barrier and wsplgen layer files for mapserver. flys-artifacts/trunk@3097 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 28 Oct 2011 08:36:32 +0000
parents f7d890f4855f
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>
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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