Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/services/CrossSectionKMService.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children 35b2d86c3fb5
rev   line source
5863
4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.services;
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10
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11 import org.dive4elements.artifacts.CallMeta;
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12 import org.dive4elements.artifacts.GlobalContext;
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13
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14 import org.dive4elements.artifacts.common.utils.XMLUtils;
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15
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16 import org.dive4elements.river.artifacts.cache.CacheFactory;
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17
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18 import org.dive4elements.river.backend.SessionHolder;
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19
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20 import org.dive4elements.river.model.CrossSection;
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21 import org.dive4elements.river.model.CrossSectionLine;
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22
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23 import java.util.AbstractMap;
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24 import java.util.ArrayDeque;
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25 import java.util.Deque;
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26 import java.util.List;
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27 import java.util.Map;
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28 import java.util.NavigableMap;
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29
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30 import java.util.concurrent.ConcurrentSkipListMap;
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31
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32 import net.sf.ehcache.Cache;
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33
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34 import org.apache.log4j.Logger;
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35
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36 import org.hibernate.Query;
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37 import org.hibernate.Session;
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38
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39 import org.w3c.dom.Document;
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40 import org.w3c.dom.Element;
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41 import org.w3c.dom.NodeList;
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42
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43
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44 /**
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45 * Service to find the next/previous km (measurement) of cross sections.
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46 * Looking at the query for a single cross-section id at a single km, the
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47 * service does the following:
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48 *
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49 * It returns the km itself if a measurement at that km was found and
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50 * the N nearest other measurement points in both directions.
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51 *
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52 * That means, you can pass N=0 to find out whether a measurement at given km
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53 * exists.
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54 *
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55 * If less than N neighbours exist in one direction, less are delivered
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56 * (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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57 * result in [4,5,7,8,9]).
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58 */
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59 public class CrossSectionKMService
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60 extends FLYSService
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61 {
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62 private static Logger logger =
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63 Logger.getLogger(CrossSectionKMService.class);
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64
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65 public static final String CACHE_NAME = "cross-section-kms";
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66
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67
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68 /** Trivial constructor. */
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69 public CrossSectionKMService() {
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70 }
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71
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72
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73 /**
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74 * @param data
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75 */
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76 @Override
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77 public Document doProcess(
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78 Document data,
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79 GlobalContext globalContext,
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80 CallMeta callMeta
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81 ) {
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82 logger.debug("CrossSectionKMService.doProcess");
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83
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84 NodeList crossSectionNodes =
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85 data.getElementsByTagName("art:cross-section");
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86
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87 Document document = XMLUtils.newDocument();
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88
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89 Element all = document.createElement("cross-sections");
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90
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91 for (int i = 0, CS = crossSectionNodes.getLength(); i < CS; ++i) {
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92 Element crossSectionElement = (Element)crossSectionNodes.item(i);
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93
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94 String idString = crossSectionElement.getAttribute("id");
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95 String kmString = crossSectionElement.getAttribute("km");
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96 String neighborsString = crossSectionElement.getAttribute("n");
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97
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98 if (idString.length() == 0 || kmString.length() == 0) {
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99 logger.debug("missing attributes in cross-section element");
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100 continue;
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101 }
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102
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103 double km;
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104 Integer crossSectionId;
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105 int N = 2;
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106
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107 try {
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108 km = Double.parseDouble(kmString);
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109 crossSectionId = Integer.valueOf(idString);
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110
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111 if (neighborsString.length() > 0) {
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112 N = Integer.parseInt(neighborsString);
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113 }
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114 }
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115 catch (NumberFormatException nfe) {
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116 logger.debug("converting number failed", nfe);
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117 continue;
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118 }
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119
2120
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diff changeset
120 NavigableMap<Double, Integer> map = getKms(crossSectionId);
1749
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121
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122 if (map == null) {
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123 logger.debug("cannot find cross section " + crossSectionId);
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124 continue;
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125 }
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126
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127 Deque<Map.Entry<Double, Integer>> result =
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128 nearestNeighbors(map, km, N);
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129
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130 if (!result.isEmpty()) {
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131 Element csE = document.createElement("cross-section");
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132 csE.setAttribute("id", idString);
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133 for (Map.Entry<Double, Integer> entry: result) {
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134 Element lineE = document.createElement("line");
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135 lineE.setAttribute(
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136 "line-id", String.valueOf(entry.getValue()));
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137 lineE.setAttribute(
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138 "km", String.valueOf(entry.getKey()));
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139 csE.appendChild(lineE);
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140 }
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141 all.appendChild(csE);
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142 }
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143 }
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144
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145 document.appendChild(all);
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146
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147 return document;
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148 }
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149
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150 public static NavigableMap<Double, Integer> getKms(int crossSectionId) {
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151
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152 Cache cache = CacheFactory.getCache(CACHE_NAME);
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153
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154 if (cache == null) {
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155 return getUncached(crossSectionId);
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156 }
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157
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diff changeset
158 NavigableMap<Double, Integer> map;
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159
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diff changeset
160 net.sf.ehcache.Element element = cache.get(crossSectionId);
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161 if (element == null) {
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diff changeset
162 map = getUncached(crossSectionId);
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diff changeset
163 if (map != null) {
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diff changeset
164 element = new net.sf.ehcache.Element(
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diff changeset
165 crossSectionId, map);
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diff changeset
166 cache.put(element);
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167 }
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diff changeset
168 }
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diff changeset
169 else {
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170 map = (NavigableMap<Double, Integer>)element.getValue();
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171 }
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172
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173 return map;
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174 }
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175
1961
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176
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177 /**
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178 * @param km the kilometer from which to start searching for other
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179 * measurements
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180 * @param N number of neighboring measurements to find.
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181 */
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182 public static Deque<Map.Entry<Double, Integer>> nearestNeighbors(
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183 NavigableMap<Double, Integer> map,
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184 double km,
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185 int N
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186 ) {
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187 Deque<Map.Entry<Double, Integer>> result =
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188 new ArrayDeque<Map.Entry<Double, Integer>>(2*N);
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189
2120
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diff changeset
190 Integer v = map.get(km);
1961
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191
2120
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192 if (v != null) {
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diff changeset
193 result.add(new AbstractMap.SimpleEntry<Double, Integer>(km, v));
1961
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194 }
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195
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196 int i = 0;
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197 for (Map.Entry<Double, Integer> entry:
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198 map.headMap(km, false).descendingMap().entrySet()) {
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diff changeset
199 if (i++ >= N) {
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diff changeset
200 break;
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diff changeset
201 }
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diff changeset
202 result.addFirst(entry);
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203 }
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204
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diff changeset
205 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
206 for (Map.Entry<Double, Integer> entry:
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parents:
diff changeset
207 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
208 if (i++ >= N) {
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parents:
diff changeset
209 break;
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parents:
diff changeset
210 }
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parents:
diff changeset
211 result.addLast(entry);
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parents:
diff changeset
212 }
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213
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parents:
diff changeset
214 return result;
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215 }
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diff changeset
216
1961
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217
4781096f31f8 Mainly documentation.
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diff changeset
218 /**
4781096f31f8 Mainly documentation.
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diff changeset
219 * @param crossSectionId id of queried cross-section (in db).
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220 * @return Mapping from kilometer to db-id.
4781096f31f8 Mainly documentation.
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parents: 1749
diff changeset
221 */
1749
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parents:
diff changeset
222 public static NavigableMap<Double, Integer> getUncached(
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parents:
diff changeset
223 Integer crossSectionId
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parents:
diff changeset
224 ) {
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parents:
diff changeset
225 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
226 new ConcurrentSkipListMap<Double, Integer>();
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parents:
diff changeset
227
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parents:
diff changeset
228 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
229 Query query = session.createQuery(
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parents:
diff changeset
230 "from CrossSection where id=:id");
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parents:
diff changeset
231 query.setParameter("id", crossSectionId);
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232
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parents:
diff changeset
233 List<CrossSection> crossSections = query.list();
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parents:
diff changeset
234 if (crossSections.isEmpty()) {
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235 return null;
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236 }
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237
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238 CrossSection crossSection = crossSections.get(0);
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239 List<CrossSectionLine> lines = crossSection.getLines();
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240
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241 for (CrossSectionLine line: lines) {
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242 Double km = line.getKm().doubleValue();
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243 Integer id = line.getId();
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244 result.put(km, id);
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245 }
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246
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247 return result;
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248 }
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249 }
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250 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org