Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/DischargeInfoServiceImpl.java @ 6837:9da2298ae380

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(issue1353) Add river name to query for discharge Info The previous assumption was that the official number is unique for a gauge. This assumption is broken by having multiple variants of a river in the database, like Donau (schleusenkanäle)
author Andre Heinecke <aheinecke@intevation.de>
date Thu, 15 Aug 2013 15:57:13 +0200
parents ea9eef426962
children 238fc722f87a
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.w3c.dom.Document;
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15 import org.w3c.dom.Element;
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16 import org.w3c.dom.NodeList;
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17
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18 import org.apache.log4j.Logger;
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19
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20 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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21
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22 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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23 import org.dive4elements.artifacts.common.utils.XMLUtils;
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24
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25 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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26 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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27 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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28
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29 import org.dive4elements.river.client.shared.exceptions.ServerException;
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30 import org.dive4elements.river.client.client.services.DischargeInfoService;
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31 import org.dive4elements.river.client.shared.model.DischargeInfoObject;
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32 import org.dive4elements.river.client.shared.model.DischargeInfoObjectImpl;
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33
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34
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35 /**
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36 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
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37 */
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38 public class DischargeInfoServiceImpl
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39 extends RemoteServiceServlet
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40 implements DischargeInfoService
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41 {
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42 private static final Logger logger =
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43 Logger.getLogger(DischargeInfoServiceImpl.class);
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44
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45 public static final String ERROR_NO_DISCHARGEINFO_FOUND =
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46 "error_no_dischargeinfo_found";
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47
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48 public static final String XPATH_DISTANCES = "art:discharges/art:discharge";
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49
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50
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51 @Override
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52 public DischargeInfoObject[] getDischargeInfo(
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53 String locale,
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54 long gauge,
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55 String river)
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56 throws ServerException
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57 {
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58 logger.info("DichargeInfoServiceImpl.getDischargeInfo");
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59
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60 String url = getServletContext().getInitParameter("server-url");
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61
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62 Document doc = XMLUtils.newDocument();
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63
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64 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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65 doc,
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66 ArtifactNamespaceContext.NAMESPACE_URI,
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67 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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68
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69 Element gaugeEl = ec.create("gauge");
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70 gaugeEl.setTextContent(String.valueOf(gauge));
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71
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72 Element riverEl = ec.create("river");
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73 riverEl.setTextContent(river);
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74
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75 gaugeEl.appendChild(riverEl);
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76 doc.appendChild(gaugeEl);
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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, "dischargeinfo", doc);
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82
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83 logger.debug("Extract discharge info objects now.");
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84 DischargeInfoObject[] objects = extractDischargeInfoObjects(result);
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85
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86 if (objects != null && objects.length > 0) {
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87 return objects;
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88 }
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89 }
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90 catch (ConnectionException ce) {
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91 logger.error(ce, ce);
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92 }
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93
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94 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND);
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95 }
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96
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97 protected DischargeInfoObject[] extractDischargeInfoObjects(
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98 Document result
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99 )
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100 throws ServerException {
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101 NodeList list = result.getElementsByTagName("discharge");
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102
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103 if (list == null || list.getLength() == 0) {
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104 logger.warn("No discharge info found.");
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105 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND);
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106 }
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107
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108 int num = list.getLength();
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109 logger.debug("Response contains " + num + " objects.");
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110
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111 List<DischargeInfoObject> objects =
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112 new ArrayList<DischargeInfoObject>(num);
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113
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114 for (int i = 0; i < num; i++) {
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115 DischargeInfoObject obj = buildDischargeInfoObject(
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116 (Element)list.item(i));
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117
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118 if (obj != null) {
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119 objects.add(obj);
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120 }
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121 }
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122
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123 logger.debug("Retrieved " + objects.size() + " discharges.");
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124
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125 return (DischargeInfoObject[])
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126 objects.toArray(new DischargeInfoObject[num]);
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127
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128 }
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129
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130 protected DischargeInfoObject buildDischargeInfoObject(Element node) {
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131
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132 String desc = node.getAttribute("description").trim();
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133 String start = node.getAttribute("start").trim();
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134 String end = node.getAttribute("end").trim();
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135 String bfgId = node.getAttribute("bfg-id").trim();
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136
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137 if (start.length() > 0 && end.length() > 0) {
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138 try {
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139 Integer startYear = Integer.valueOf(start);
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140 Integer endYear = Integer.valueOf(end);
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141 return new DischargeInfoObjectImpl(
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142 desc, startYear, endYear, bfgId);
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143 }
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144 catch (NumberFormatException nfe) {
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145 logger.warn(nfe.getLocalizedMessage());
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146 }
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147 }
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148
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149 logger.warn("Invalid distance info object found.");
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150
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151 return null;
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152 }
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153 }
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154 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org