Mercurial > dive4elements > river
annotate gwt-client/src/main/java/org/dive4elements/river/client/server/DistanceInfoServiceImpl.java @ 8230:f54c4b858213
(issue1448) Extend SedimentLoadInfo request to handle sq time intervals
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Mon, 08 Sep 2014 16:23:38 +0200 |
parents | 238fc722f87a |
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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50 |
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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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112 |
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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 : |