Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 4400:e4985122e76c

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conf.xml: Register the extreme_curve_export generator, a WaterlevelExporter.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Mon, 05 Nov 2012 12:25:39 +0100
parents 6bb6d43eeb2d
children
rev   line source
219
7523faf567e5 Implemented a service to fetch distance information of a river from the artifact server.
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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.w3c.dom.Document;
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7 import org.w3c.dom.Element;
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8 import org.w3c.dom.NodeList;
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9
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10 import org.apache.log4j.Logger;
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12 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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13
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.common.utils.XMLUtils;
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16
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17 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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18 import de.intevation.artifacts.httpclient.http.HttpClient;
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19 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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20
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21 import de.intevation.flys.client.shared.exceptions.ServerException;
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22 import de.intevation.flys.client.client.services.DistanceInfoService;
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23 import de.intevation.flys.client.shared.model.DistanceInfoObject;
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24 import de.intevation.flys.client.shared.model.DistanceInfoObjectImpl;
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26
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27 /**
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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29 */
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30 public class DistanceInfoServiceImpl
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31 extends RemoteServiceServlet
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32 implements DistanceInfoService
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33 {
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34 private static final Logger logger =
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35 Logger.getLogger(DistanceInfoServiceImpl.class);
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36
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37 public static final String ERROR_NO_DISTANCEINFO_FOUND =
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38 "error_no_distanceinfo_found";
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39
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40 public static final String XPATH_DISTANCES = "art:distances/art:distance";
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42
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43 public DistanceInfoObject[] getDistanceInfo(
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44 String locale,
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45 String river)
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46 throws ServerException
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47 {
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48 logger.info("DistanceInfoServiceImpl.getDistanceInfo");
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49
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50 String url = getServletContext().getInitParameter("server-url");
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51
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52 Document doc = XMLUtils.newDocument();
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53
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54 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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55 doc,
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56 ArtifactNamespaceContext.NAMESPACE_URI,
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57 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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58
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59 Element riverEl = ec.create("river");
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60
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61 riverEl.setTextContent(river);
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62
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63 doc.appendChild(riverEl);
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64
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65 HttpClient client = new HttpClientImpl(url, locale);
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66
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67 try {
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68 Document result = client.callService(url, "distanceinfo", doc);
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69
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70 logger.debug("Extract distance info objects now.");
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71 DistanceInfoObject[] objects = extractDistanceInfoObjects(result);
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72
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73 if (objects != null && objects.length > 0) {
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74 return objects;
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75 }
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76 }
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77 catch (ConnectionException ce) {
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78 logger.error(ce, ce);
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79 }
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80
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81 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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82 }
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83
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84
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85 /**
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86 * Extracts all distance info objects from <i>result</i> document.
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87 *
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88 * @param result The document retrieved by the server.
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89 *
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90 * @return a list of DistanceInfoObjects.
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91 */
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92 protected DistanceInfoObject[] extractDistanceInfoObjects(Document result)
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93 throws ServerException
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94 {
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95 NodeList list = result.getElementsByTagName("distance");
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96
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97 if (list == null || list.getLength() == 0) {
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98 logger.warn("No distance info found.");
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99 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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100 }
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101
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102 int num = list.getLength();
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103 logger.debug("Response contains " + num + " objects.");
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104
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105 List<DistanceInfoObject> objects =
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106 new ArrayList<DistanceInfoObject>(num);
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107
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108 for (int i = 0; i < num; i++) {
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109 DistanceInfoObject obj = buildDistanceInfoObject(
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110 (Element)list.item(i));
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111
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112 if (obj != null) {
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113 objects.add(obj);
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114 }
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115 }
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116
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117 logger.debug("Retrieved " + objects.size() + " distances.");
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118
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119 return (DistanceInfoObject[])
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120 objects.toArray(new DistanceInfoObject[num]);
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121 }
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122
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123
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124 /**
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125 * Extracts information for a single distance info object and intializes an
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126 * DistanceInfoObject with them.
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127 *
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128 * @param node The node that contains the information.
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129 *
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130 * @return a valid DistanceInfoObject.
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131 */
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132 protected DistanceInfoObject buildDistanceInfoObject(Element node) {
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133
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134 String desc = node.getAttribute("description").trim();
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135 String from = node.getAttribute("from").trim();
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136 String to = node.getAttribute("to").trim();
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137 String riverside = node.getAttribute("riverside").trim();
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138 String bottom = node.getAttribute("bottom").trim();
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139 String top = node.getAttribute("top").trim();
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140
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141 if (desc.length() > 0 && from.length() > 0) {
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142 try {
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143 Double f = new Double(from);
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144 Double t = to .length() > 0 ? new Double(to) : null;
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145 Double b = bottom.length() > 0 ? new Double(bottom) : null;
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146 Double tp = top .length() > 0 ? new Double(top) : null;
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147
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148 return new DistanceInfoObjectImpl(desc, f, t, riverside, b, tp);
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149 }
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150 catch (NumberFormatException nfe) {
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151 logger.warn(nfe.getLocalizedMessage());
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152 }
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153 }
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154
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155 logger.warn("Invalid distance info object found.");
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156
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157 return null;
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158 }
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159 }
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160 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org