Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 4604:488db475613d
Add methods to hide and show the manage projects button of the header
It should be possible to show the manage projects button only if the ProjectList
is hidden. Therefore add methods to allow to show and hide the button.
author | Björn Ricks <bjoern.ricks@intevation.de> |
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date | Fri, 30 Nov 2012 10:00:39 +0100 |
parents | 6bb6d43eeb2d |
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rev | line source |
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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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25 |
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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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41 |
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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 : |