Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 301:1a00cb4998a8

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Implemented a service that retrieves distance information for a specific river. flys-artifacts/trunk@1660 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 11 Apr 2011 12:54:03 +0000
parents
children aeeb9054b7cf
rev   line source
301
1a00cb4998a8 Implemented a service that retrieves distance information for a specific river.
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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.List;
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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.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
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24 import de.intevation.flys.artifacts.model.AnnotationsFactory;
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25
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26
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27 /**
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28 * This service provides information about distances of a specified river.
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29 *
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 */
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32 public class DistanceInfoService extends DefaultService {
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33
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34 /** The logger used in this service.*/
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35 private static Logger logger = Logger.getLogger(DistanceInfoService.class);
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36
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37
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38 /**
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39 * The default constructor.
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40 */
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41 public DistanceInfoService() {
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42 }
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43
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44
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45 public Document process(
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46 Document data,
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47 Object globalContext,
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48 CallMeta callMeta)
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49 {
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50 logger.debug("DistanceInfoService.process");
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51
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52 Document result = XMLUtils.newDocument();
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53
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54 String river = XMLUtils.xpathString(
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55 data, "/art:river/text()", ArtifactNamespaceContext.INSTANCE);
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56
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57 if (river == null || river.trim().length() == 0) {
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58 logger.warn("No river specified. Cannot return distance info!");
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59 return result;
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60 }
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61
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62 logger.debug("Search distances for river: " + river);
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63
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64 ElementCreator ec = new ElementCreator(
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65 result,
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66 ArtifactNamespaceContext.NAMESPACE_URI,
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67 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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68
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69 List<Annotation> annotations = AnnotationsFactory.getAnnotations(river);
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70
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71 if (annotations == null || annotations.size() == 0) {
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72 logger.warn("No information found for the specified river!");
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73 return result;
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74 }
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75
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76 Element all = ec.create("distances");
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77
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78 for (Annotation a: annotations) {
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79 Element distance = buildDistanceNode(ec, a);
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80
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81 if (distance != null) {
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82 all.appendChild(distance);
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83 }
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84 }
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85
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86 result.appendChild(all);
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87
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88 return result;
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89 }
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90
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91
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92 /**
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93 * This method build an Element for a distance info.
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94 *
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95 * @param ec The ElementCreator.
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96 * @param anno The Annotation that provides information about the distance.
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97 *
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98 * @return an Element that contains information about a distance.
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99 */
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100 protected Element buildDistanceNode(ElementCreator ec, Annotation anno) {
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101 Position pos = anno.getPosition();
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102 Range range = anno.getRange();
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103 Attribute attr = anno.getAttribute();
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104
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105 BigDecimal a = range.getA();
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106 BigDecimal b = range.getB();
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107
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108 Element distance = ec.create("distance");
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109 ec.addAttr(distance, "description", pos.getValue(), true);
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110 ec.addAttr(distance, "from", a != null ? a.toString() : "", true);
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111 ec.addAttr(distance, "to", b != null ? b.toString() : "", true);
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112 ec.addAttr(distance, "riverside", attr.getValue(), true);
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113
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114 return distance;
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115 }
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116 }
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117 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org