Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/SedimentLoadInfoServiceImpl.java @ 4740:fb135e1dfa35

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Added 'type' attribute to <dc:variable/> element. If an optional 'type' attribute is given the result of the XPATH expression is interpreted as this type. Valid values are 'number', 'bool', 'node' and 'nodeset'. All other defaults to 'string' which also is the default if nor type is given.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 02 Jan 2013 15:31:53 +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