Mercurial > dive4elements > river
annotate gwt-client/src/main/java/org/dive4elements/river/client/server/DischargeInfoServiceImpl.java @ 5861:172338b1407f
GWT client: Added copyright header.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 28 Apr 2013 14:30:15 +0200 |
parents | 5aa05a7a34b7 |
children | b96a293d30f3 |
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 public DischargeInfoObject[] getDischargeInfo( |
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52 String locale, |
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53 long gauge) |
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54 throws ServerException |
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55 { |
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56 logger.info("DichargeInfoServiceImpl.getDischargeInfo"); |
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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 gaugeEl = ec.create("gauge"); |
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68 gaugeEl.setTextContent(String.valueOf(gauge)); |
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69 |
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70 doc.appendChild(gaugeEl); |
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71 |
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72 HttpClient client = new HttpClientImpl(url, locale); |
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73 |
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74 try { |
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75 Document result = client.callService(url, "dischargeinfo", doc); |
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76 |
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77 logger.debug("Extract discharge info objects now."); |
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78 DischargeInfoObject[] objects = extractDischargeInfoObjects(result); |
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79 |
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80 if (objects != null && objects.length > 0) { |
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81 return objects; |
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82 } |
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83 } |
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84 catch (ConnectionException ce) { |
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85 logger.error(ce, ce); |
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86 } |
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87 |
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88 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND); |
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89 } |
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90 |
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91 protected DischargeInfoObject[] extractDischargeInfoObjects( |
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92 Document result |
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93 ) |
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94 throws ServerException { |
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95 NodeList list = result.getElementsByTagName("discharge"); |
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96 |
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97 if (list == null || list.getLength() == 0) { |
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98 logger.warn("No discharge info found."); |
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99 throw new ServerException(ERROR_NO_DISCHARGEINFO_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<DischargeInfoObject> objects = |
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106 new ArrayList<DischargeInfoObject>(num); |
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107 |
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108 for (int i = 0; i < num; i++) { |
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109 DischargeInfoObject obj = buildDischargeInfoObject( |
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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() + " discharges."); |
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118 |
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119 return (DischargeInfoObject[]) |
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120 objects.toArray(new DischargeInfoObject[num]); |
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121 |
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122 } |
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123 |
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124 protected DischargeInfoObject buildDischargeInfoObject(Element node) { |
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125 |
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126 String desc = node.getAttribute("description").trim(); |
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127 String start = node.getAttribute("start").trim(); |
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128 String end = node.getAttribute("end").trim(); |
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129 |
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130 if (start.length() > 0 && end.length() > 0) { |
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131 try { |
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132 Integer startYear = new Integer(start); |
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133 Integer endYear = new Integer(end); |
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134 return new DischargeInfoObjectImpl(desc, startYear, endYear); |
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135 } |
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136 catch (NumberFormatException nfe) { |
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137 logger.warn(nfe.getLocalizedMessage()); |
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138 } |
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139 } |
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140 |
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141 logger.warn("Invalid distance info object found."); |
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142 |
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143 return null; |
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144 } |
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145 } |
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146 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |