Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/DischargeInfoServiceImpl.java @ 5583:523cd27b4c42
Element.getAttributeNS() does not return null values.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Fri, 05 Apr 2013 23:16:31 +0200 |
parents | 67468c90ca68 |
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rev | line source |
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1600
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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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11 |
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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.DischargeInfoService; |
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23 import de.intevation.flys.client.shared.model.DischargeInfoObject; |
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24 import de.intevation.flys.client.shared.model.DischargeInfoObjectImpl; |
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25 |
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26 |
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27 /** |
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28 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a> |
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29 */ |
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30 public class DischargeInfoServiceImpl |
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31 extends RemoteServiceServlet |
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32 implements DischargeInfoService |
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33 { |
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34 private static final Logger logger = |
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35 Logger.getLogger(DischargeInfoServiceImpl.class); |
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36 |
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37 public static final String ERROR_NO_DISCHARGEINFO_FOUND = |
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38 "error_no_dischargeinfo_found"; |
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39 |
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40 public static final String XPATH_DISTANCES = "art:discharges/art:discharge"; |
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41 |
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42 |
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43 public DischargeInfoObject[] getDischargeInfo( |
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44 String locale, |
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45 long gauge) |
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46 throws ServerException |
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47 { |
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48 logger.info("DichargeInfoServiceImpl.getDischargeInfo"); |
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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 gaugeEl = ec.create("gauge"); |
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60 gaugeEl.setTextContent(String.valueOf(gauge)); |
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61 |
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62 doc.appendChild(gaugeEl); |
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63 |
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64 HttpClient client = new HttpClientImpl(url, locale); |
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65 |
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66 try { |
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67 Document result = client.callService(url, "dischargeinfo", doc); |
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68 |
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69 logger.debug("Extract discharge info objects now."); |
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70 DischargeInfoObject[] objects = extractDischargeInfoObjects(result); |
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71 |
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72 if (objects != null && objects.length > 0) { |
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73 return objects; |
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74 } |
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75 } |
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76 catch (ConnectionException ce) { |
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77 logger.error(ce, ce); |
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78 } |
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79 |
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80 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND); |
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81 } |
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82 |
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83 protected DischargeInfoObject[] extractDischargeInfoObjects( |
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84 Document result |
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85 ) |
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86 throws ServerException { |
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87 NodeList list = result.getElementsByTagName("discharge"); |
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88 |
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89 if (list == null || list.getLength() == 0) { |
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90 logger.warn("No discharge info found."); |
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91 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND); |
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92 } |
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93 |
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94 int num = list.getLength(); |
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95 logger.debug("Response contains " + num + " objects."); |
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96 |
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97 List<DischargeInfoObject> objects = |
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98 new ArrayList<DischargeInfoObject>(num); |
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99 |
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100 for (int i = 0; i < num; i++) { |
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101 DischargeInfoObject obj = buildDischargeInfoObject( |
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102 (Element)list.item(i)); |
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103 |
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104 if (obj != null) { |
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105 objects.add(obj); |
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106 } |
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107 } |
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108 |
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109 logger.debug("Retrieved " + objects.size() + " discharges."); |
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110 |
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111 return (DischargeInfoObject[]) |
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112 objects.toArray(new DischargeInfoObject[num]); |
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113 |
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114 } |
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115 |
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116 protected DischargeInfoObject buildDischargeInfoObject(Element node) { |
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117 |
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118 String desc = node.getAttribute("description").trim(); |
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119 String start = node.getAttribute("start").trim(); |
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120 String end = node.getAttribute("end").trim(); |
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121 |
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122 if (start.length() > 0 && end.length() > 0) { |
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123 try { |
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124 Integer startYear = new Integer(start); |
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125 Integer endYear = new Integer(end); |
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126 return new DischargeInfoObjectImpl(desc, startYear, endYear); |
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127 } |
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128 catch (NumberFormatException nfe) { |
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129 logger.warn(nfe.getLocalizedMessage()); |
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130 } |
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131 } |
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132 |
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133 logger.warn("Invalid distance info object found."); |
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134 |
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135 return null; |
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136 } |
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137 } |
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138 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |