Mercurial > dive4elements > river
annotate gwt-client/src/main/java/org/dive4elements/river/client/server/SedimentLoadInfoServiceImpl.java @ 5861:172338b1407f
GWT client: Added copyright header.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 28 Apr 2013 14:30:15 +0200 |
parents | 5aa05a7a34b7 |
children | ea9eef426962 |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.client.server; |
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10 |
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11 import java.util.ArrayList; |
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12 import java.util.List; |
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13 |
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14 import org.apache.log4j.Logger; |
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15 import org.w3c.dom.Document; |
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16 import org.w3c.dom.Element; |
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17 import org.w3c.dom.NodeList; |
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18 |
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19 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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20 |
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21 import org.dive4elements.artifacts.common.ArtifactNamespaceContext; |
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22 import org.dive4elements.artifacts.common.utils.XMLUtils; |
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23 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException; |
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24 import org.dive4elements.artifacts.httpclient.http.HttpClient; |
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25 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl; |
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26 import org.dive4elements.river.client.client.services.SedimentLoadInfoService; |
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27 import org.dive4elements.river.client.shared.exceptions.ServerException; |
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28 import org.dive4elements.river.client.shared.model.SedimentLoadInfoObject; |
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29 import org.dive4elements.river.client.shared.model.SedimentLoadInfoObjectImpl; |
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30 |
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31 |
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32 public class SedimentLoadInfoServiceImpl |
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33 extends RemoteServiceServlet |
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34 implements SedimentLoadInfoService |
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35 { |
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36 private static final Logger logger = |
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37 Logger.getLogger(SedimentLoadInfoServiceImpl.class); |
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38 |
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39 public static final String ERROR_NO_SEDIMENTLOADINFO_FOUND = |
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40 "error_no_sedimentloadinfo_found"; |
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41 |
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42 @Override |
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43 public SedimentLoadInfoObject[] getSedimentLoadInfo( |
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44 String locale, |
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45 String river, |
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46 String type, |
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47 double startKm, |
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48 double endKm) |
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49 throws ServerException |
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50 { |
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51 logger.info("SedimentLoadInfoServiceImpl.getSedimentLoadInfo"); |
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52 |
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53 String url = getServletContext().getInitParameter("server-url"); |
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54 |
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55 Document doc = XMLUtils.newDocument(); |
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56 |
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57 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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58 doc, |
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59 ArtifactNamespaceContext.NAMESPACE_URI, |
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60 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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61 |
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62 Element riverEl = ec.create("river"); |
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63 Element location = ec.create("location"); |
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64 Element from = ec.create("from"); |
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65 Element to = ec.create("to"); |
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66 Element typeEl = ec.create("type"); |
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67 riverEl.setTextContent(river); |
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68 from.setTextContent(String.valueOf(startKm)); |
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69 to.setTextContent(String.valueOf(endKm)); |
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70 typeEl.setTextContent(type); |
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71 |
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72 location.appendChild(from); |
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73 location.appendChild(to); |
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74 riverEl.appendChild(location); |
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75 riverEl.appendChild(typeEl); |
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76 doc.appendChild(riverEl); |
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77 |
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78 HttpClient client = new HttpClientImpl(url, locale); |
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79 |
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80 try { |
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81 Document result = client.callService(url, "sedimentloadinfo", doc); |
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82 |
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83 logger.debug("Extract sedimentload info objects now."); |
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84 SedimentLoadInfoObject[] objects = |
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85 extractSedimentLoadInfoObjects(result); |
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86 |
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87 if (objects != null && objects.length > 0) { |
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88 return objects; |
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89 } |
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90 } |
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91 catch (ConnectionException ce) { |
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92 logger.error(ce, ce); |
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93 } |
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94 |
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95 throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND); |
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96 } |
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97 |
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98 |
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99 /** |
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100 * Extracts all distance info objects from <i>result</i> document. |
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101 * |
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102 * @param result The document retrieved by the server. |
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103 * |
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104 * @return a list of DistanceInfoObjects. |
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105 */ |
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106 protected SedimentLoadInfoObject[] extractSedimentLoadInfoObjects( |
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107 Document result) |
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108 throws ServerException |
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109 { |
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110 NodeList list = result.getElementsByTagName("sedimentload"); |
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111 |
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112 if (list == null || list.getLength() == 0) { |
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113 logger.warn("No sedimentload info found."); |
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114 throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND); |
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115 } |
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116 |
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117 int num = list.getLength(); |
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118 logger.debug("Response contains " + num + " objects."); |
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119 |
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120 List<SedimentLoadInfoObject> objects = |
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121 new ArrayList<SedimentLoadInfoObject>(num); |
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122 |
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123 for (int i = 0; i < num; i++) { |
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124 SedimentLoadInfoObject obj = buildSedimentLoadInfoObject( |
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125 (Element)list.item(i)); |
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126 |
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127 if (obj != null) { |
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128 objects.add(obj); |
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129 } |
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130 } |
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131 |
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132 logger.debug("Retrieved " + objects.size() + " sediment loads."); |
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133 |
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134 return (SedimentLoadInfoObject[]) |
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135 objects.toArray(new SedimentLoadInfoObject[num]); |
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136 } |
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137 |
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138 |
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139 /** |
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140 * Extracts information for a single distance info object and intializes an |
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141 * DistanceInfoObject with them. |
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142 * |
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143 * @param node The node that contains the information. |
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144 * |
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145 * @return a valid DistanceInfoObject. |
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146 */ |
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147 protected SedimentLoadInfoObject buildSedimentLoadInfoObject(Element node) { |
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148 |
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149 String desc = node.getAttribute("description").trim(); |
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150 String date = node.getAttribute("date").trim(); |
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151 |
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152 if (desc.length() > 0 && date.length() > 0) { |
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153 return new SedimentLoadInfoObjectImpl(desc, date); |
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154 } |
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155 |
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156 logger.warn("Invalid sediment load info object found."); |
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157 |
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158 return null; |
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159 } |
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160 } |