Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 795:68b8770af6c5
Added strings for the output mode 'floodmap'.
flys-client/trunk@2305 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 07 Jul 2011 15:04:45 +0000 |
parents | 78907f0fb939 |
children | ab8eb2f544f2 |
rev | line source |
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Implemented a service to fetch distance information of a river from the artifact server.
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parents:
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1 package de.intevation.flys.client.server; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.List; |
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5 |
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6 import org.w3c.dom.Document; |
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7 import org.w3c.dom.Element; |
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8 import org.w3c.dom.NodeList; |
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9 |
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10 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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11 |
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12 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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13 import de.intevation.artifacts.common.utils.XMLUtils; |
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14 |
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15 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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16 import de.intevation.artifacts.httpclient.http.HttpClient; |
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17 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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18 |
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19 import de.intevation.flys.client.shared.exceptions.ServerException; |
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20 import de.intevation.flys.client.client.services.DistanceInfoService; |
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21 import de.intevation.flys.client.shared.model.DistanceInfoObject; |
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22 import de.intevation.flys.client.shared.model.DistanceInfoObjectImpl; |
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23 |
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24 |
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25 /** |
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26 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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27 */ |
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28 public class DistanceInfoServiceImpl |
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29 extends RemoteServiceServlet |
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30 implements DistanceInfoService |
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31 { |
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32 public static final String ERROR_NO_DISTANCEINFO_FOUND = |
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33 "error_no_distanceinfo_found"; |
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34 |
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35 public static final String XPATH_DISTANCES = "art:distances/art:distance"; |
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36 |
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37 |
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38 public DistanceInfoObject[] getDistanceInfo( |
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39 String url, |
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40 String locale, |
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41 String river) |
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42 throws ServerException |
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43 { |
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44 System.out.println("DistanceInfoServiceImpl.getDistanceInfo"); |
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45 |
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46 Document doc = XMLUtils.newDocument(); |
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47 |
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48 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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49 doc, |
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50 ArtifactNamespaceContext.NAMESPACE_URI, |
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51 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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52 |
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53 Element riverEl = ec.create("river"); |
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54 |
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55 riverEl.setTextContent(river); |
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56 |
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57 doc.appendChild(riverEl); |
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58 |
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59 HttpClient client = new HttpClientImpl(url, locale); |
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60 |
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61 try { |
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62 Document result = client.callService(url, "distanceinfo", doc); |
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63 |
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64 System.out.println("Extract distance info objects now."); |
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65 DistanceInfoObject[] objects = extractDistanceInfoObjects(result); |
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66 |
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67 if (objects != null && objects.length > 0) { |
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68 return objects; |
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69 } |
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70 } |
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71 catch (ConnectionException ce) { |
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72 System.err.println(ce.getLocalizedMessage()); |
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73 } |
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74 |
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75 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); |
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76 } |
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77 |
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78 |
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79 /** |
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80 * Extracts all distance info objects from <i>result</i> document. |
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81 * |
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82 * @param result The document retrieved by the server. |
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83 * |
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84 * @return a list of DistanceInfoObjects. |
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85 */ |
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86 protected DistanceInfoObject[] extractDistanceInfoObjects(Document result) |
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87 throws ServerException |
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88 { |
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89 NodeList list = result.getElementsByTagName("distance"); |
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90 |
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91 if (list == null || list.getLength() == 0) { |
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92 System.err.println("No distance info found."); |
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93 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); |
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94 } |
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95 |
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96 int num = list.getLength(); |
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97 System.out.println("Response contains " + num + " objects."); |
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98 |
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99 List<DistanceInfoObject> objects = |
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100 new ArrayList<DistanceInfoObject>(num); |
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101 |
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102 for (int i = 0; i < num; i++) { |
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103 DistanceInfoObject obj = buildDistanceInfoObject( |
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104 (Element)list.item(i)); |
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105 |
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106 if (obj != null) { |
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107 objects.add(obj); |
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108 } |
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109 } |
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110 |
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111 System.out.println("Retrieved " + objects.size() + " distances."); |
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112 |
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113 return (DistanceInfoObject[]) |
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114 objects.toArray(new DistanceInfoObject[num]); |
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115 } |
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116 |
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117 |
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118 /** |
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119 * Extracts information for a single distance info object and intializes an |
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120 * DistanceInfoObject with them. |
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121 * |
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122 * @param node The node that contains the information. |
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123 * |
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124 * @return a valid DistanceInfoObject. |
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125 */ |
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126 protected DistanceInfoObject buildDistanceInfoObject(Element node) { |
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127 |
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128 String desc = node.getAttribute("description").trim(); |
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129 String from = node.getAttribute("from").trim(); |
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130 String to = node.getAttribute("to").trim(); |
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131 String riverside = node.getAttribute("riverside").trim(); |
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132 String bottom = node.getAttribute("bottom").trim(); |
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133 String top = node.getAttribute("top").trim(); |
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134 |
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135 if (desc.length() > 0 && from.length() > 0) { |
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136 try { |
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137 Double f = new Double(from); |
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138 Double t = to .length() > 0 ? new Double(to) : null; |
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139 Double b = bottom.length() > 0 ? new Double(bottom) : null; |
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140 Double tp = top .length() > 0 ? new Double(top) : null; |
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141 |
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142 return new DistanceInfoObjectImpl(desc, f, t, riverside, b, tp); |
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143 } |
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144 catch (NumberFormatException nfe) { |
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145 System.err.println(nfe.getLocalizedMessage()); |
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146 } |
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147 } |
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148 |
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149 System.err.println("Invalid distance info object found."); |
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150 |
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151 return null; |
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152 } |
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153 } |
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154 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |