Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/SedimentLoadInfoServiceImpl.java @ 5861:172338b1407f

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GWT client: Added copyright header.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:30:15 +0200
parents 5aa05a7a34b7
children ea9eef426962
rev   line source
5861
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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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 }
http://dive4elements.wald.intevation.org