Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 648:d4c4fefb095b

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The matrix that is used to transform chart image coordinates into chart coordinates supports inverted x-axis now. flys-artifacts/trunk@2037 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 01 Jun 2011 09:18:00 +0000
parents 02c0cce0e469
children bcd62609c936 3dc61e00385e
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 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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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
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25 import de.intevation.flys.artifacts.model.AnnotationsFactory;
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26
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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 /** The logger used in this service.*/
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41 private static Logger logger = Logger.getLogger(DistanceInfoService.class);
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42
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43 public static final String CACHE_NAME = "service-distanceinfo";
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44
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45 public static final String RIVER_XPATH = "/art:river/text()";
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47
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48 /**
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49 * The default constructor.
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50 */
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51 public DistanceInfoService() {
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52 }
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53
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54
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55 public Document process(
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56 Document data,
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57 Object globalContext,
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58 CallMeta callMeta)
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59 {
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60 logger.debug("DistanceInfoService.process");
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61
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62 String river = XMLUtils.xpathString(
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63 data, RIVER_XPATH, ArtifactNamespaceContext.INSTANCE);
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64
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65 if (river == null || (river = river.trim()).length() == 0) {
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66 logger.warn("No river specified. Cannot return distance info!");
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67 return XMLUtils.newDocument();
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68 }
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69
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70 logger.debug("Search distances for river: " + river);
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71
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72 Cache cache = CacheFactory.getCache(CACHE_NAME);
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73
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74 if (cache == null) {
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75 logger.debug("no cache configured for distance info");
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76 return getUncached(river);
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77 }
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78
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79 net.sf.ehcache.Element element = cache.get(river);
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80
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81 if (element != null) {
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82 logger.debug("distance info found in cache");
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83 return (Document)element.getValue();
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84 }
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85
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86 Document result = getUncached(river);
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87
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88 element = new net.sf.ehcache.Element(river, result);
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89
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90 logger.debug("store distance info found into cache");
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91
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92 cache.put(element);
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93
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94 return result;
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95 }
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96
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97 protected Document getUncached(String river) {
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98
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99 Document result = XMLUtils.newDocument();
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100
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101 ElementCreator ec = new ElementCreator(
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102 result,
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103 ArtifactNamespaceContext.NAMESPACE_URI,
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104 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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105
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106 Session session = SessionHolder.acquire();
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107
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108 try {
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109 Iterator<Annotation> iter =
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110 AnnotationsFactory.getAnnotationsIterator(river);
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112 Element all = ec.create("distances");
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113
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114 while (iter.hasNext()) {
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115 Annotation a = iter.next();
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116 Element distance = buildDistanceNode(ec, a);
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117 all.appendChild(distance);
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118 }
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119
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120 result.appendChild(all);
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121 }
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122 finally {
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123 session.close();
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124 SessionHolder.release();
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125 }
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126
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127 return result;
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128 }
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129
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130
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131 /**
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132 * This method build an Element for a distance info.
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133 *
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134 * @param ec The ElementCreator.
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135 * @param anno The Annotation that provides information about the distance.
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136 *
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137 * @return an Element that contains information about a distance.
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138 */
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139 protected static Element buildDistanceNode(ElementCreator ec, Annotation anno) {
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140 Position pos = anno.getPosition();
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141 Range range = anno.getRange();
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142 Attribute attr = anno.getAttribute();
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143
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144 BigDecimal a = range.getA();
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145 BigDecimal b = range.getB();
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146
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147 Element distance = ec.create("distance");
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148 ec.addAttr(distance, "description", pos.getValue(), true);
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149 ec.addAttr(distance, "from", a != null ? a.toString() : "", true);
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150 ec.addAttr(distance, "to", b != null ? b.toString() : "", true);
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151 ec.addAttr(distance, "riverside", attr.getValue(), true);
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152
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153 return distance;
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154 }
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155 }
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156 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org