Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 922:95356252c309

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Added the option to call the distance info service with a filter to fetch locations or distances only. flys-artifacts/trunk@2272 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 01 Jul 2011 08:33:52 +0000
parents eab5e5089d77
children a63d79107289
rev   line source
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1 package de.intevation.flys.artifacts.services;
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2
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3 import java.math.BigDecimal;
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4 import java.util.Iterator;
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5
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6 import org.apache.log4j.Logger;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10
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11 import de.intevation.artifacts.CallMeta;
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12
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13 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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14 import de.intevation.artifacts.common.utils.XMLUtils;
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15
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16 import de.intevation.artifactdatabase.DefaultService;
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17
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18 import de.intevation.flys.backend.SessionHolder;
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19 import de.intevation.flys.model.Annotation;
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20 import de.intevation.flys.model.Attribute;
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21 import de.intevation.flys.model.Position;
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22 import de.intevation.flys.model.Range;
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23 import de.intevation.flys.model.Edge;
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24
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25 import de.intevation.flys.artifacts.model.AnnotationsFactory;
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27 import org.hibernate.Session;
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29 import de.intevation.flys.artifacts.cache.CacheFactory;
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30
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31 import net.sf.ehcache.Cache;
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33 /**
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34 * This service provides information about distances of a specified river.
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35 *
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36 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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37 */
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38 public class DistanceInfoService extends DefaultService {
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39
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40 private static enum DistanceFilter {
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41 NONE, LOCATIONS, DISTANCES
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42 }
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44 /** The logger used in this service.*/
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45 private static Logger logger = Logger.getLogger(DistanceInfoService.class);
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47 public static final String CACHE_NAME = "service-distanceinfo";
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48
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49 public static final String RIVER_XPATH = "/art:river/text()";
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51 public static final String FILTER_XPATH = "/art:river/art:filter/text()";
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53
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54 /**
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55 * The default constructor.
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56 */
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57 public DistanceInfoService() {
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58 }
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60
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61 public Document process(
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62 Document data,
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63 Object globalContext,
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64 CallMeta callMeta)
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65 {
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66 logger.debug("DistanceInfoService.process");
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67
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68 String river = XMLUtils.xpathString(
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69 data, RIVER_XPATH, ArtifactNamespaceContext.INSTANCE);
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71 String filter = XMLUtils.xpathString(
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72 data, FILTER_XPATH, ArtifactNamespaceContext.INSTANCE);
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73
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74 if (river == null || (river = river.trim()).length() == 0) {
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75 logger.warn("No river specified. Cannot return distance info!");
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76 return XMLUtils.newDocument();
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77 }
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78
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79 logger.debug("Search distances for river: " + river);
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80
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81 Cache cache = CacheFactory.getCache(CACHE_NAME);
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82
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83 if (cache == null) {
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84 logger.debug("no cache configured for distance info");
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85 return getUncached(river, filter);
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86 }
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89 String key = getCacheKey(river, filter);
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90
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91 net.sf.ehcache.Element element = cache.get(key);
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92
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93 if (element != null) {
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94 logger.debug("distance info found in cache");
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95 return (Document)element.getValue();
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96 }
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97
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98 Document result = getUncached(river, filter);
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99
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100 element = new net.sf.ehcache.Element(key, result);
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101
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102 logger.debug("store distance info found into cache");
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103
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104 cache.put(element);
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105
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106 return result;
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107 }
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108
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109
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110 protected String getCacheKey(String river, String filtertype) {
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111 return filtertype != null && filtertype.length() > 0
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112 ? river + "_" + filtertype
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113 : river;
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114 }
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115
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116
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117 protected Document getUncached(String river, String filtertype) {
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118
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119 Document result = XMLUtils.newDocument();
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120
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121 Session session = SessionHolder.acquire();
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122
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123 try {
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124 Iterator<Annotation> iter =
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125 AnnotationsFactory.getAnnotationsIterator(river);
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126
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127 Element all = result.createElement("distances");
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128
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129 DistanceFilter filter = getDistanceFilter(filtertype);
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130
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131 while (iter.hasNext()) {
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132 Annotation a = iter.next();
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133 Element distance = buildDistanceNode(result, a, filter);
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134
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135 if (distance != null) {
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136 all.appendChild(distance);
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137 }
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138 }
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139
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140 result.appendChild(all);
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141 }
314
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142 finally {
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143 session.close();
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144 SessionHolder.release();
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145 }
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146
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147 return result;
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148 }
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149
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150
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151 protected static DistanceFilter getDistanceFilter(String type) {
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152 if (type.equals("locations")) {
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153 logger.debug("Found 'location' filter.");
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154 return DistanceFilter.LOCATIONS;
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155 }
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156 else if (type.equals("distances")) {
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157 logger.debug("Found 'distances' filter.");
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158 return DistanceFilter.DISTANCES;
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159 }
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160
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161 logger.debug("Do not use any filter at all.");
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162
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163 return DistanceFilter.NONE;
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164 }
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165
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166
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167 /**
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168 * This method build an Element for a distance info.
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169 *
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170 * @param ec The ElementCreator.
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171 * @param anno The Annotation that provides information about the distance.
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172 *
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173 * @return an Element that contains information about a distance.
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174 */
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175 protected static Element buildDistanceNode(
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176 Document document,
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177 Annotation anno,
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178 DistanceFilter filter
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179 ) {
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180 Position pos = anno.getPosition();
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181 Range range = anno.getRange();
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182 Attribute attr = anno.getAttribute();
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183 Edge edge = anno.getEdge();
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184 BigDecimal a = range.getA();
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185 BigDecimal b = range.getB();
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186
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187 if (b == null && filter == DistanceFilter.DISTANCES) {
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188 return null;
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189 }
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190
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191 if (b != null && filter == DistanceFilter.LOCATIONS) {
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192 return null;
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193 }
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194
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195 Element distance = document.createElement("distance");
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196
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197 distance.setAttribute("description", pos.getValue());
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198
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199 String riverSide = attr.getValue();
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200
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201 if (riverSide != null && riverSide.length() > 0) {
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202 distance.setAttribute("riverside", riverSide);
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203 }
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204
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205 if (a != null) {
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206 distance.setAttribute("from", a.toString());
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207 }
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208 if (b != null) {
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209 distance.setAttribute("to", b.toString());
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210 }
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211 if (edge != null) {
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212 BigDecimal bottom = edge.getBottom();
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213 BigDecimal top = edge.getTop();
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214 if (bottom != null) {
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215 distance.setAttribute("bottom", bottom.toString());
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216 }
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217 if (top != null) {
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218 distance.setAttribute("top", top.toString());
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219 }
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220 }
301
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221
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222 return distance;
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223 }
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224 }
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225 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org