Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/CrossSectionKMService.java @ 4496:d8992459b408

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Add method to return the facets of an artifact This methos should be used to get the facets of an artifact instead of accessing the facets member variable directly.
author Björn Ricks <bjoern.ricks@intevation.de>
date Wed, 14 Nov 2012 11:11:04 +0100
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