Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/DistanceInfoServiceImpl.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 ea9eef426962
children 0a5239a1e46e
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.DistanceInfoService;
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31 import org.dive4elements.river.client.shared.model.DistanceInfoObject;
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32 import org.dive4elements.river.client.shared.model.DistanceInfoObjectImpl;
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33
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34
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35 /**
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36 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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37 */
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38 public class DistanceInfoServiceImpl
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39 extends RemoteServiceServlet
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40 implements DistanceInfoService
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41 {
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42 private static final Logger log =
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43 Logger.getLogger(DistanceInfoServiceImpl.class);
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44
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45 public static final String ERROR_NO_DISTANCEINFO_FOUND =
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46 "error_no_distanceinfo_found";
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47
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48 public static final String XPATH_DISTANCES = "art:distances/art:distance";
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49
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51 public DistanceInfoObject[] getDistanceInfo(
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52 String locale,
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53 String river)
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54 throws ServerException
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55 {
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56 log.info("DistanceInfoServiceImpl.getDistanceInfo");
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57
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58 String url = getServletContext().getInitParameter("server-url");
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59
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60 Document doc = XMLUtils.newDocument();
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61
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62 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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63 doc,
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64 ArtifactNamespaceContext.NAMESPACE_URI,
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65 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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66
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67 Element riverEl = ec.create("river");
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68
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69 riverEl.setTextContent(river);
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70
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71 doc.appendChild(riverEl);
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72
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73 HttpClient client = new HttpClientImpl(url, locale);
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74
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75 try {
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76 Document result = client.callService(url, "distanceinfo", doc);
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77
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78 log.debug("Extract distance info objects now.");
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79 DistanceInfoObject[] objects = extractDistanceInfoObjects(result);
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80
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81 if (objects != null && objects.length > 0) {
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82 return objects;
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83 }
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84 }
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85 catch (ConnectionException ce) {
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86 log.error(ce, ce);
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87 }
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88
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89 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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90 }
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91
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92
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93 /**
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94 * Extracts all distance info objects from <i>result</i> document.
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95 *
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96 * @param result The document retrieved by the server.
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97 *
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98 * @return a list of DistanceInfoObjects.
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99 */
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100 protected DistanceInfoObject[] extractDistanceInfoObjects(Document result)
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101 throws ServerException
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102 {
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103 NodeList list = result.getElementsByTagName("distance");
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104
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105 if (list == null || list.getLength() == 0) {
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106 log.warn("No distance info found.");
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107 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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108 }
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109
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110 int num = list.getLength();
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111 log.debug("Response contains " + num + " objects.");
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113 List<DistanceInfoObject> objects =
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114 new ArrayList<DistanceInfoObject>(num);
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115
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116 for (int i = 0; i < num; i++) {
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117 DistanceInfoObject obj = buildDistanceInfoObject(
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118 (Element)list.item(i));
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119
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120 if (obj != null) {
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121 objects.add(obj);
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122 }
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123 }
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124
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125 log.debug("Retrieved " + objects.size() + " distances.");
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126
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127 return (DistanceInfoObject[])
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128 objects.toArray(new DistanceInfoObject[num]);
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129 }
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130
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131
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132 /**
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133 * Extracts information for a single distance info object and intializes an
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134 * DistanceInfoObject with them.
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135 *
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136 * @param node The node that contains the information.
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137 *
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138 * @return a valid DistanceInfoObject.
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139 */
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140 protected DistanceInfoObject buildDistanceInfoObject(Element node) {
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141
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142 String desc = node.getAttribute("description").trim();
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143 String from = node.getAttribute("from").trim();
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144 String to = node.getAttribute("to").trim();
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145 String riverside = node.getAttribute("riverside").trim();
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146 String bottom = node.getAttribute("bottom").trim();
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147 String top = node.getAttribute("top").trim();
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148
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149 if (desc.length() > 0 && from.length() > 0) {
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150 try {
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151 Double f = new Double(from);
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152 Double t = to .length() > 0 ? new Double(to) : null;
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153 Double b = bottom.length() > 0 ? new Double(bottom) : null;
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154 Double tp = top .length() > 0 ? new Double(top) : null;
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155
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156 return new DistanceInfoObjectImpl(desc, f, t, riverside, b, tp);
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157 }
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158 catch (NumberFormatException nfe) {
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159 log.warn(nfe.getLocalizedMessage());
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160 }
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161 }
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162
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163 log.warn("Invalid distance info object found.");
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164
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165 return null;
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166 }
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167 }
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168 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org