Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/DistanceInfoServiceImpl.java @ 9801:1d7a72a50183 3.2.x tip

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Assume Compose V2, consistently
author Tom Gottfried <tom@intevation.de>
date Thu, 23 Nov 2023 10:14:13 +0100
parents 0a5239a1e46e
children
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.logging.log4j.Logger;
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19 import org.apache.logging.log4j.LogManager;
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20
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21 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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22
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23 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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24 import org.dive4elements.artifacts.common.utils.XMLUtils;
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25
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26 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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27 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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28 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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29
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30 import org.dive4elements.river.client.shared.exceptions.ServerException;
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31 import org.dive4elements.river.client.client.services.DistanceInfoService;
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32 import org.dive4elements.river.client.shared.model.DistanceInfoObject;
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33 import org.dive4elements.river.client.shared.model.DistanceInfoObjectImpl;
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34
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35
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36 /**
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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38 */
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39 public class DistanceInfoServiceImpl
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40 extends RemoteServiceServlet
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41 implements DistanceInfoService
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42 {
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43 private static final Logger log =
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44 LogManager.getLogger(DistanceInfoServiceImpl.class);
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45
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46 public static final String ERROR_NO_DISTANCEINFO_FOUND =
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47 "error_no_distanceinfo_found";
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48
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49 public static final String XPATH_DISTANCES = "art:distances/art:distance";
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50
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51
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52 public DistanceInfoObject[] getDistanceInfo(
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53 String locale,
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54 String river)
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55 throws ServerException
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56 {
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57 log.info("DistanceInfoServiceImpl.getDistanceInfo");
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58
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59 String url = getServletContext().getInitParameter("server-url");
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60
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61 Document doc = XMLUtils.newDocument();
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62
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63 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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64 doc,
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65 ArtifactNamespaceContext.NAMESPACE_URI,
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66 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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67
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68 Element riverEl = ec.create("river");
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69
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70 riverEl.setTextContent(river);
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71
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72 doc.appendChild(riverEl);
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73
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74 HttpClient client = new HttpClientImpl(url, locale);
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75
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76 try {
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77 Document result = client.callService(url, "distanceinfo", doc);
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78
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79 log.debug("Extract distance info objects now.");
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80 DistanceInfoObject[] objects = extractDistanceInfoObjects(result);
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81
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82 if (objects != null && objects.length > 0) {
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83 return objects;
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84 }
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85 }
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86 catch (ConnectionException ce) {
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87 log.error(ce, ce);
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88 }
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89
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90 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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91 }
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93
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94 /**
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95 * Extracts all distance info objects from <i>result</i> document.
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96 *
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97 * @param result The document retrieved by the server.
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98 *
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99 * @return a list of DistanceInfoObjects.
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100 */
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101 protected DistanceInfoObject[] extractDistanceInfoObjects(Document result)
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102 throws ServerException
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103 {
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104 NodeList list = result.getElementsByTagName("distance");
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105
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106 if (list == null || list.getLength() == 0) {
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107 log.warn("No distance info found.");
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108 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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109 }
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110
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111 int num = list.getLength();
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112 log.debug("Response contains " + num + " objects.");
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114 List<DistanceInfoObject> objects =
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115 new ArrayList<DistanceInfoObject>(num);
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116
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117 for (int i = 0; i < num; i++) {
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118 DistanceInfoObject obj = buildDistanceInfoObject(
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119 (Element)list.item(i));
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120
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121 if (obj != null) {
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122 objects.add(obj);
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123 }
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124 }
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125
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126 log.debug("Retrieved " + objects.size() + " distances.");
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127
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128 return (DistanceInfoObject[])
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129 objects.toArray(new DistanceInfoObject[num]);
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130 }
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131
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132
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133 /**
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134 * Extracts information for a single distance info object and intializes an
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135 * DistanceInfoObject with them.
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136 *
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137 * @param node The node that contains the information.
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138 *
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139 * @return a valid DistanceInfoObject.
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140 */
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141 protected DistanceInfoObject buildDistanceInfoObject(Element node) {
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142
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143 String desc = node.getAttribute("description").trim();
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144 String from = node.getAttribute("from").trim();
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145 String to = node.getAttribute("to").trim();
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146 String riverside = node.getAttribute("riverside").trim();
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147 String bottom = node.getAttribute("bottom").trim();
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148 String top = node.getAttribute("top").trim();
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149
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150 if (desc.length() > 0 && from.length() > 0) {
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151 try {
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152 Double f = new Double(from);
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153 Double t = to .length() > 0 ? new Double(to) : null;
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154 Double b = bottom.length() > 0 ? new Double(bottom) : null;
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155 Double tp = top .length() > 0 ? new Double(top) : null;
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156
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157 return new DistanceInfoObjectImpl(desc, f, t, riverside, b, tp);
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158 }
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159 catch (NumberFormatException nfe) {
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160 log.warn(nfe.getLocalizedMessage());
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161 }
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162 }
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163
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164 log.warn("Invalid distance info object found.");
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165
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166 return null;
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167 }
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168 }
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169 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org