Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 1072:80aecb01d79a
Let MainValuesArtifact have a state, outputmode and facet.
flys-artifacts/trunk@2556 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 24 Aug 2011 12:07:33 +0000 |
parents | b1ed0ec0236f |
children | 26e19cdaed5e |
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 import de.intevation.artifacts.GlobalContext; |
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13 |
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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15 import de.intevation.artifacts.common.utils.XMLUtils; |
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16 |
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17 import de.intevation.artifactdatabase.DefaultService; |
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18 |
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19 import de.intevation.flys.backend.SessionHolder; |
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20 import de.intevation.flys.model.Annotation; |
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21 import de.intevation.flys.model.Attribute; |
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22 import de.intevation.flys.model.Position; |
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23 import de.intevation.flys.model.Range; |
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24 import de.intevation.flys.model.Edge; |
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25 |
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26 import de.intevation.flys.artifacts.model.AnnotationsFactory; |
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27 |
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28 import org.hibernate.Session; |
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29 |
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30 import de.intevation.flys.artifacts.cache.CacheFactory; |
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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 /** |
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35 * This service provides information about distances of a specified river. |
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36 * |
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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38 */ |
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39 public class DistanceInfoService extends DefaultService { |
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40 |
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41 private static enum DistanceFilter { |
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42 NONE, LOCATIONS, DISTANCES |
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43 } |
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44 |
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45 /** The logger used in this service. */ |
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46 private static Logger logger = Logger.getLogger(DistanceInfoService.class); |
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47 |
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48 public static final String CACHE_NAME = "service-distanceinfo"; |
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49 |
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50 public static final String RIVER_XPATH = "/art:river/text()"; |
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51 |
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52 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 /** |
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56 * The default constructor. |
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57 */ |
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58 public DistanceInfoService() { |
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59 } |
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60 |
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61 |
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62 @Override |
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63 public Document process( |
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64 Document data, |
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65 GlobalContext globalContext, |
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66 CallMeta callMeta |
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67 ) { |
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68 logger.debug("DistanceInfoService.process"); |
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69 |
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70 String river = XMLUtils.xpathString( |
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71 data, RIVER_XPATH, ArtifactNamespaceContext.INSTANCE); |
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72 |
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73 String filter = XMLUtils.xpathString( |
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74 data, FILTER_XPATH, ArtifactNamespaceContext.INSTANCE); |
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75 |
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76 if (river == null || (river = river.trim()).length() == 0) { |
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77 logger.warn("No river specified. Cannot return distance info!"); |
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78 return XMLUtils.newDocument(); |
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79 } |
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80 |
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81 logger.debug("Search distances for river: " + river); |
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82 |
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83 Cache cache = CacheFactory.getCache(CACHE_NAME); |
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84 |
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85 if (cache == null) { |
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86 logger.debug("no cache configured for distance info"); |
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87 return getUncached(river, filter); |
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88 } |
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89 |
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90 |
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91 String key = getCacheKey(river, filter); |
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92 |
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93 net.sf.ehcache.Element element = cache.get(key); |
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94 |
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95 if (element != null) { |
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96 logger.debug("distance info found in cache"); |
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97 return (Document)element.getValue(); |
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98 } |
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99 |
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100 Document result = getUncached(river, filter); |
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101 |
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102 element = new net.sf.ehcache.Element(key, result); |
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103 |
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104 logger.debug("store distance info found into cache"); |
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105 |
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106 cache.put(element); |
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107 |
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108 return result; |
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109 } |
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110 |
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111 |
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112 protected String getCacheKey(String river, String filtertype) { |
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113 return filtertype != null && filtertype.length() > 0 |
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114 ? river + "_" + filtertype |
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115 : river; |
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116 } |
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117 |
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118 |
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119 protected Document getUncached(String river, String filtertype) { |
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120 |
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121 Document result = XMLUtils.newDocument(); |
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122 |
314
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123 Session session = SessionHolder.acquire(); |
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124 |
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125 try { |
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126 Iterator<Annotation> iter = |
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127 AnnotationsFactory.getAnnotationsIterator(river); |
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128 |
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129 Element all = result.createElement("distances"); |
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130 |
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131 DistanceFilter filter = getDistanceFilter(filtertype); |
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132 |
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133 while (iter.hasNext()) { |
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134 Annotation a = iter.next(); |
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135 Element distance = buildDistanceNode(result, a, filter); |
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136 |
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137 if (distance != null) { |
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138 all.appendChild(distance); |
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139 } |
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140 } |
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141 |
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142 result.appendChild(all); |
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143 } |
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144 finally { |
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145 session.close(); |
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146 SessionHolder.release(); |
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147 } |
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148 |
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149 return result; |
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150 } |
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151 |
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152 |
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153 protected static DistanceFilter getDistanceFilter(String type) { |
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154 if (type.equals("locations")) { |
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155 logger.debug("Found 'location' filter."); |
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156 return DistanceFilter.LOCATIONS; |
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157 } |
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158 else if (type.equals("distances")) { |
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159 logger.debug("Found 'distances' filter."); |
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160 return DistanceFilter.DISTANCES; |
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161 } |
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162 |
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163 logger.debug("Do not use any filter at all."); |
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164 |
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165 return DistanceFilter.NONE; |
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166 } |
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167 |
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168 |
301
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169 /** |
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170 * Builds an Element for a distance info. |
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171 * |
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172 * @param anno The Annotation that provides information about the distance. |
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173 * |
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174 * @return an Element that contains information about a distance. |
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175 */ |
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176 protected static Element buildDistanceNode( |
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177 Document document, |
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178 Annotation anno, |
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179 DistanceFilter filter |
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180 ) { |
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181 Position pos = anno.getPosition(); |
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182 Range range = anno.getRange(); |
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183 Attribute attr = anno.getAttribute(); |
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184 Edge edge = anno.getEdge(); |
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185 BigDecimal a = range.getA(); |
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186 BigDecimal b = range.getB(); |
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187 |
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188 if (b == null && filter == DistanceFilter.DISTANCES) { |
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189 return null; |
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190 } |
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191 |
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192 if (b != null && filter == DistanceFilter.LOCATIONS) { |
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193 return null; |
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194 } |
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195 |
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196 Element distance = document.createElement("distance"); |
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197 |
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198 distance.setAttribute("description", pos.getValue()); |
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199 |
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200 String riverSide = attr.getValue(); |
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201 |
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202 if (riverSide != null && riverSide.length() > 0) { |
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203 distance.setAttribute("riverside", riverSide); |
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204 } |
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205 |
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206 if (a != null) { |
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207 distance.setAttribute("from", a.toString()); |
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208 } |
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209 if (b != null) { |
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210 distance.setAttribute("to", b.toString()); |
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211 } |
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212 if (edge != null) { |
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213 BigDecimal bottom = edge.getBottom(); |
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214 BigDecimal top = edge.getTop(); |
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215 if (bottom != null) { |
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216 distance.setAttribute("bottom", bottom.toString()); |
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217 } |
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218 if (top != null) { |
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Merged with trunk and introduced hashing of computed values.
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parents:
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219 distance.setAttribute("top", top.toString()); |
3dc61e00385e
Merged with trunk and introduced hashing of computed values.
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parents:
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220 } |
3dc61e00385e
Merged with trunk and introduced hashing of computed values.
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parents:
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221 } |
301
1a00cb4998a8
Implemented a service that retrieves distance information for a specific river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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222 |
1a00cb4998a8
Implemented a service that retrieves distance information for a specific river.
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parents:
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223 return distance; |
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Implemented a service that retrieves distance information for a specific river.
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parents:
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224 } |
1a00cb4998a8
Implemented a service that retrieves distance information for a specific river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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225 } |
1a00cb4998a8
Implemented a service that retrieves distance information for a specific river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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226 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |