Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 551:13c7f90917fc
Added a PanControl to pan charts.
flys-client/trunk@2064 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 07 Jun 2011 13:07:27 +0000 |
parents | 924da6695800 |
children | d9fc58e30a53 |
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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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 javax.xml.xpath.XPathConstants; |
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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 import org.w3c.dom.Node; |
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11 import org.w3c.dom.NodeList; |
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12 |
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13 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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14 |
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15 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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16 import de.intevation.artifacts.common.utils.XMLUtils; |
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17 |
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18 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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19 import de.intevation.artifacts.httpclient.http.HttpClient; |
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20 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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21 |
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22 import de.intevation.flys.client.shared.exceptions.ServerException; |
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23 import de.intevation.flys.client.client.services.DistanceInfoService; |
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24 import de.intevation.flys.client.shared.model.DistanceInfoObject; |
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25 import de.intevation.flys.client.shared.model.DistanceInfoObjectImpl; |
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26 |
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27 |
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28 /** |
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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30 */ |
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31 public class DistanceInfoServiceImpl |
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32 extends RemoteServiceServlet |
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33 implements DistanceInfoService |
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34 { |
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35 public static final String ERROR_NO_DISTANCEINFO_FOUND = |
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36 "error_no_distanceinfo_found"; |
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37 |
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38 public static final String XPATH_DISTANCES = "art:distances/art:distance"; |
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39 |
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40 |
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41 public DistanceInfoObject[] getDistanceInfo( |
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42 String url, |
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43 String locale, |
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44 String river) |
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45 throws ServerException |
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46 { |
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47 System.out.println("DistanceInfoServiceImpl.getDistanceInfo"); |
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48 |
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49 Document doc = XMLUtils.newDocument(); |
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50 |
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51 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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52 doc, |
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53 ArtifactNamespaceContext.NAMESPACE_URI, |
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54 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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55 |
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56 Element riverEl = ec.create("river"); |
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57 |
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58 riverEl.setTextContent(river); |
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59 |
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60 doc.appendChild(riverEl); |
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61 |
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62 HttpClient client = new HttpClientImpl(url, locale); |
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63 |
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64 try { |
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65 Document result = client.callService(url, "distanceinfo", doc); |
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66 |
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67 System.out.println("Extract distance info objects now."); |
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68 DistanceInfoObject[] objects = extractDistanceInfoObjects(result); |
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69 |
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70 if (objects != null && objects.length > 0) { |
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71 return objects; |
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72 } |
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73 } |
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74 catch (ConnectionException ce) { |
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75 System.err.println(ce.getLocalizedMessage()); |
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76 } |
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77 |
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78 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); |
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79 } |
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80 |
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81 |
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82 /** |
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83 * Extracts all distance info objects from <i>result</i> document. |
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84 * |
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85 * @param result The document retrieved by the server. |
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86 * |
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87 * @return a list of DistanceInfoObjects. |
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88 */ |
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89 protected DistanceInfoObject[] extractDistanceInfoObjects(Document result) |
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90 throws ServerException |
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91 { |
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92 NodeList list = (NodeList) XMLUtils.xpath( |
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93 result, |
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94 XPATH_DISTANCES, |
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95 XPathConstants.NODESET, |
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96 ArtifactNamespaceContext.INSTANCE); |
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97 |
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98 if (list == null || list.getLength() == 0) { |
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99 System.err.println("No distance info found."); |
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100 |
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101 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); |
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102 } |
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103 |
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104 int num = list.getLength(); |
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105 System.out.println("Response contains " + num + " objects."); |
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106 |
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107 List<DistanceInfoObject> objects = |
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108 new ArrayList<DistanceInfoObject>(num); |
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109 |
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110 for (int i = 0; i < num; i++) { |
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111 DistanceInfoObject obj = buildDistanceInfoObject(list.item(i)); |
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112 |
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113 if (obj != null) { |
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114 objects.add(obj); |
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115 } |
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116 } |
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117 |
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118 System.out.println("Retrieved " + objects.size() + " distances."); |
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119 |
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120 return (DistanceInfoObject[]) |
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121 objects.toArray(new DistanceInfoObject[num]); |
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122 } |
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123 |
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124 |
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125 /** |
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126 * Extracts information for a single distance info object and intializes an |
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127 * DistanceInfoObject with them. |
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128 * |
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129 * @param node The node that contains the information. |
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130 * |
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131 * @return a valid DistanceInfoObject. |
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132 */ |
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133 protected DistanceInfoObject buildDistanceInfoObject(Node node) { |
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134 String desc = XMLUtils.xpathString( |
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135 node, "@art:description", ArtifactNamespaceContext.INSTANCE); |
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136 |
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137 String from = XMLUtils.xpathString( |
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138 node, "@art:from", ArtifactNamespaceContext.INSTANCE); |
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139 |
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140 String to = XMLUtils.xpathString( |
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141 node, "@art:to", ArtifactNamespaceContext.INSTANCE); |
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142 |
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143 String riverside = XMLUtils.xpathString( |
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144 node, "@art:riverside", ArtifactNamespaceContext.INSTANCE); |
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145 |
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146 if (desc != null && from != null) { |
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147 try { |
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148 return new DistanceInfoObjectImpl( |
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149 desc, |
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150 new Double(from), |
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151 to != null && to.trim().length() > 0 ? new Double(to) : null, |
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152 riverside); |
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153 } |
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154 catch (NumberFormatException nfe) { |
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155 System.err.println(nfe.getLocalizedMessage()); |
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156 } |
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157 } |
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158 |
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159 System.err.println("Invalid distance info object found."); |
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160 |
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161 return null; |
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162 } |
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163 } |
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164 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |