Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/SedimentLoadInfoServiceImpl.java @ 8203:238fc722f87a

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sed 's/logger/log/g' src/**/*.java
author Sascha L. Teichmann <teichmann@intevation.de>
date Fri, 05 Sep 2014 13:19:22 +0200
parents 4a12fd5c9e29
children f54c4b858213
rev   line source
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Sascha L. Teichmann <teichmann@intevation.de>
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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 /** Service to fetch info about sediment load. */
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33 public class SedimentLoadInfoServiceImpl
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34 extends RemoteServiceServlet
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35 implements SedimentLoadInfoService
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36 {
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37 private static final Logger log =
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38 Logger.getLogger(SedimentLoadInfoServiceImpl.class);
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39
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40 public static final String ERROR_NO_SEDIMENTLOADINFO_FOUND =
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41 "error_no_sedimentloadinfo_found";
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42
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43 @Override
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44 public SedimentLoadInfoObject[] getSedimentLoadInfo(
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45 String locale,
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46 String river,
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47 String type,
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48 double startKm,
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49 double endKm)
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50 throws ServerException
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51 {
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52 log.info("SedimentLoadInfoServiceImpl.getSedimentLoadInfo");
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53
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54 String url = getServletContext().getInitParameter("server-url");
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55
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56 Document doc = XMLUtils.newDocument();
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57
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58 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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59 doc,
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60 ArtifactNamespaceContext.NAMESPACE_URI,
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61 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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62
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63 Element riverEl = ec.create("river");
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64 Element location = ec.create("location");
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65 Element from = ec.create("from");
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66 Element to = ec.create("to");
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67 Element typeEl = ec.create("type");
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68 riverEl.setTextContent(river);
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69 from.setTextContent(String.valueOf(startKm));
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70 to.setTextContent(String.valueOf(endKm));
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71 typeEl.setTextContent(type);
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72
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73 location.appendChild(from);
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74 location.appendChild(to);
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75 riverEl.appendChild(location);
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76 riverEl.appendChild(typeEl);
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77 doc.appendChild(riverEl);
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78
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79 HttpClient client = new HttpClientImpl(url, locale);
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80
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81 try {
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82 Document result = client.callService(url, "sedimentloadinfo", doc);
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83
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84 log.debug("Extract sedimentload info objects now.");
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85 SedimentLoadInfoObject[] objects =
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86 extractSedimentLoadInfoObjects(result);
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87
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88 if (objects != null && objects.length > 0) {
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89 return objects;
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90 }
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91 }
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92 catch (ConnectionException ce) {
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93 log.error(ce, ce);
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94 }
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95
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96 throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND);
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97 }
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98
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99
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100 /**
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101 * Extracts all distance info objects from <i>result</i> document.
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102 *
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103 * @param result The document retrieved by the server.
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104 *
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105 * @return a list of DistanceInfoObjects.
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106 */
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107 protected SedimentLoadInfoObject[] extractSedimentLoadInfoObjects(
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108 Document result)
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109 throws ServerException
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110 {
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111 NodeList list = result.getElementsByTagName("sedimentload");
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112
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113 if (list == null || list.getLength() == 0) {
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114 log.warn("No sedimentload info found.");
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115 throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND);
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116 }
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117
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118 int num = list.getLength();
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119 log.debug("Response contains " + num + " objects.");
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120
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121 List<SedimentLoadInfoObject> objects =
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122 new ArrayList<SedimentLoadInfoObject>(num);
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123
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124 for (int i = 0; i < num; i++) {
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125 SedimentLoadInfoObject obj = buildSedimentLoadInfoObject(
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126 (Element)list.item(i));
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127
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128 if (obj != null) {
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129 objects.add(obj);
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130 }
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131 }
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132
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133 log.debug("Retrieved " + objects.size() + " sediment loads.");
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134
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135 return (SedimentLoadInfoObject[])
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136 objects.toArray(new SedimentLoadInfoObject[num]);
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137 }
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138
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139
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140 /**
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141 * Extracts information for a single distance info object and intializes an
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142 * DistanceInfoObject with them.
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143 *
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144 * @param node The node that contains the information.
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145 *
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146 * @return a valid DistanceInfoObject.
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147 */
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148 protected SedimentLoadInfoObject buildSedimentLoadInfoObject(Element node) {
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149
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150 String desc = node.getAttribute("description").trim();
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151 String date = node.getAttribute("date").trim();
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152
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153 if (desc.length() > 0 && date.length() > 0) {
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154 return new SedimentLoadInfoObjectImpl(desc, date);
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155 }
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156
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157 log.warn("Invalid sediment load info object found.");
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158
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159 return null;
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160 }
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161 }
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Felix Wolfsteller <felix.wolfsteller@intevation.de>
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162 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org