Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/SedimentLoadInfoServiceImpl.java @ 4515:17d896822d70

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Added methods to sediment load object to check fractions.
author Raimund Renkert <rrenkert@intevation.de>
date Wed, 14 Nov 2012 17:02:51 +0100
parents 1f98a3a89e13
children
rev   line source
4298
1f98a3a89e13 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 }
http://dive4elements.wald.intevation.org