Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/SedimentLoadInfoServiceImpl.java @ 5144:2c31625d4e6a
New icons! Use the new icons in project list and for export buttons.
author | Raimund Renkert <rrenkert@intevation.de> |
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date | Thu, 28 Feb 2013 16:40:16 +0100 |
parents | 1f98a3a89e13 |
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rev | line source |
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New client side service for sediment load infos.
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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.apache.log4j.Logger; |
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7 import org.w3c.dom.Document; |
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8 import org.w3c.dom.Element; |
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9 import org.w3c.dom.NodeList; |
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10 |
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11 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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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.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 import de.intevation.flys.client.client.services.SedimentLoadInfoService; |
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19 import de.intevation.flys.client.shared.exceptions.ServerException; |
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20 import de.intevation.flys.client.shared.model.SedimentLoadInfoObject; |
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21 import de.intevation.flys.client.shared.model.SedimentLoadInfoObjectImpl; |
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22 |
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23 |
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24 public class SedimentLoadInfoServiceImpl |
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25 extends RemoteServiceServlet |
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26 implements SedimentLoadInfoService |
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27 { |
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28 private static final Logger logger = |
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29 Logger.getLogger(SedimentLoadInfoServiceImpl.class); |
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30 |
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31 public static final String ERROR_NO_SEDIMENTLOADINFO_FOUND = |
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32 "error_no_sedimentloadinfo_found"; |
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33 |
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34 @Override |
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35 public SedimentLoadInfoObject[] getSedimentLoadInfo( |
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36 String locale, |
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37 String river, |
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38 String type, |
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39 double startKm, |
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40 double endKm) |
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41 throws ServerException |
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42 { |
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43 logger.info("SedimentLoadInfoServiceImpl.getSedimentLoadInfo"); |
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44 |
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45 String url = getServletContext().getInitParameter("server-url"); |
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46 |
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47 Document doc = XMLUtils.newDocument(); |
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48 |
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49 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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50 doc, |
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51 ArtifactNamespaceContext.NAMESPACE_URI, |
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52 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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53 |
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54 Element riverEl = ec.create("river"); |
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55 Element location = ec.create("location"); |
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56 Element from = ec.create("from"); |
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57 Element to = ec.create("to"); |
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58 Element typeEl = ec.create("type"); |
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59 riverEl.setTextContent(river); |
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60 from.setTextContent(String.valueOf(startKm)); |
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61 to.setTextContent(String.valueOf(endKm)); |
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62 typeEl.setTextContent(type); |
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63 |
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64 location.appendChild(from); |
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65 location.appendChild(to); |
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66 riverEl.appendChild(location); |
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67 riverEl.appendChild(typeEl); |
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68 doc.appendChild(riverEl); |
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69 |
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70 HttpClient client = new HttpClientImpl(url, locale); |
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71 |
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72 try { |
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73 Document result = client.callService(url, "sedimentloadinfo", doc); |
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74 |
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75 logger.debug("Extract sedimentload info objects now."); |
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76 SedimentLoadInfoObject[] objects = |
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77 extractSedimentLoadInfoObjects(result); |
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78 |
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79 if (objects != null && objects.length > 0) { |
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80 return objects; |
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81 } |
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82 } |
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83 catch (ConnectionException ce) { |
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84 logger.error(ce, ce); |
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85 } |
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86 |
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87 throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND); |
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88 } |
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89 |
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90 |
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91 /** |
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92 * Extracts all distance info objects from <i>result</i> document. |
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93 * |
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94 * @param result The document retrieved by the server. |
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95 * |
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96 * @return a list of DistanceInfoObjects. |
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97 */ |
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98 protected SedimentLoadInfoObject[] extractSedimentLoadInfoObjects( |
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99 Document result) |
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100 throws ServerException |
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101 { |
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102 NodeList list = result.getElementsByTagName("sedimentload"); |
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103 |
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104 if (list == null || list.getLength() == 0) { |
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105 logger.warn("No sedimentload info found."); |
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106 throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND); |
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107 } |
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108 |
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109 int num = list.getLength(); |
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110 logger.debug("Response contains " + num + " objects."); |
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111 |
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112 List<SedimentLoadInfoObject> objects = |
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113 new ArrayList<SedimentLoadInfoObject>(num); |
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114 |
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115 for (int i = 0; i < num; i++) { |
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116 SedimentLoadInfoObject obj = buildSedimentLoadInfoObject( |
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117 (Element)list.item(i)); |
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118 |
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119 if (obj != null) { |
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120 objects.add(obj); |
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121 } |
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122 } |
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123 |
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124 logger.debug("Retrieved " + objects.size() + " sediment loads."); |
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125 |
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126 return (SedimentLoadInfoObject[]) |
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127 objects.toArray(new SedimentLoadInfoObject[num]); |
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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 * Extracts information for a single distance info object and intializes an |
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133 * DistanceInfoObject with them. |
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134 * |
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135 * @param node The node that contains the information. |
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136 * |
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137 * @return a valid DistanceInfoObject. |
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138 */ |
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139 protected SedimentLoadInfoObject buildSedimentLoadInfoObject(Element node) { |
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140 |
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141 String desc = node.getAttribute("description").trim(); |
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142 String date = node.getAttribute("date").trim(); |
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143 |
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144 if (desc.length() > 0 && date.length() > 0) { |
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145 return new SedimentLoadInfoObjectImpl(desc, date); |
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146 } |
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147 |
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148 logger.warn("Invalid sediment load info object found."); |
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149 |
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150 return null; |
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151 } |
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152 } |