Mercurial > dive4elements > river
annotate gwt-client/src/main/java/org/dive4elements/river/client/server/WQInfoServiceImpl.java @ 7136:fd8b27cdf498
issue971: Let ChartOutputServiceImpl interprete an "encoding" parameter.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 25 Sep 2013 11:48:54 +0200 |
parents | 19459037b3c7 |
children | 2ca1f3991e17 |
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.Arrays; |
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13 import java.util.Comparator; |
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14 import java.util.List; |
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15 |
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16 import javax.xml.xpath.XPathConstants; |
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17 |
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18 import org.w3c.dom.Document; |
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19 import org.w3c.dom.Element; |
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20 import org.w3c.dom.Node; |
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21 import org.w3c.dom.NodeList; |
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22 |
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23 import org.apache.log4j.Logger; |
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24 |
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25 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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26 |
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27 import org.dive4elements.artifacts.common.ArtifactNamespaceContext; |
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28 import org.dive4elements.artifacts.common.utils.XMLUtils; |
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29 |
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30 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException; |
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31 import org.dive4elements.artifacts.httpclient.http.HttpClient; |
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32 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl; |
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33 |
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34 import org.dive4elements.river.client.shared.exceptions.ServerException; |
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35 import org.dive4elements.river.client.client.services.WQInfoService; |
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36 import org.dive4elements.river.client.shared.model.WQInfoObject; |
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37 import org.dive4elements.river.client.shared.model.WQInfoObjectImpl; |
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38 |
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39 |
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40 /** |
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41 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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42 */ |
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43 public class WQInfoServiceImpl |
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44 extends RemoteServiceServlet |
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45 implements WQInfoService |
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46 { |
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47 private static final Logger logger = |
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48 Logger.getLogger(WQInfoServiceImpl.class); |
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49 |
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50 public static final String ERROR_NO_WQINFO_FOUND = |
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51 "error_no_wqinfo_found"; |
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52 |
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53 public static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue"; |
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54 |
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55 |
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56 public WQInfoObject[] getWQInfo( |
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57 String locale, |
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58 String river, |
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59 double from, |
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60 double to) |
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61 throws ServerException |
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62 { |
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63 logger.info("WQInfoServiceImpl.getWQInfo"); |
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64 |
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65 String url = getServletContext().getInitParameter("server-url"); |
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66 |
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67 Document doc = XMLUtils.newDocument(); |
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68 |
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69 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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70 doc, |
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71 ArtifactNamespaceContext.NAMESPACE_URI, |
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72 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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73 |
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74 Element mainvalues = ec.create("mainvalues"); |
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75 Element riverEl = ec.create("river"); |
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76 Element startEl = ec.create("start"); |
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77 Element endEl = ec.create("end"); |
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78 |
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79 riverEl.setTextContent(river); |
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80 startEl.setTextContent(Double.valueOf(from).toString()); |
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81 endEl.setTextContent(Double.valueOf(to).toString()); |
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82 |
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83 mainvalues.appendChild(riverEl); |
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84 mainvalues.appendChild(startEl); |
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85 mainvalues.appendChild(endEl); |
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86 |
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87 doc.appendChild(mainvalues); |
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88 |
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89 HttpClient client = new HttpClientImpl(url, locale); |
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90 |
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91 try { |
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92 Document result = client.callService(url, "mainvalues", doc); |
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93 |
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94 logger.debug("Extract wq info objects now."); |
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95 WQInfoObject[] objects = extractWQInfoObjects(result); |
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96 |
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97 if (objects.length > 0) { |
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98 return objects; |
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99 } |
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100 } |
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101 catch (ConnectionException ce) { |
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102 logger.error(ce, ce); |
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103 } |
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104 |
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105 throw new ServerException(ERROR_NO_WQINFO_FOUND); |
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106 } |
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107 |
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108 |
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109 /** |
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110 * Extracts all wq info objects from <i>result</i> document. |
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111 * |
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112 * @param result The document retrieved by the server. |
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113 * |
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114 * @return a list of WQInfoObjects. |
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115 */ |
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116 protected WQInfoObject[] extractWQInfoObjects(Document result) |
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117 throws ServerException |
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118 { |
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119 NodeList list = (NodeList) XMLUtils.xpath( |
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120 result, |
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121 XPATH_WQS, |
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122 XPathConstants.NODESET, |
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123 ArtifactNamespaceContext.INSTANCE); |
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124 |
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125 if (list == null || list.getLength() == 0) { |
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126 logger.warn("No wq info found."); |
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127 |
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128 throw new ServerException(ERROR_NO_WQINFO_FOUND); |
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129 } |
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130 |
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131 boolean debug = logger.isDebugEnabled(); |
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132 |
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133 int num = list.getLength(); |
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134 if (debug) { |
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135 logger.debug("Response contains " + num + " objects."); |
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136 } |
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137 |
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138 List<WQInfoObject> objects = |
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139 new ArrayList<WQInfoObject>(num); |
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140 |
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141 for (int i = 0; i < num; i++) { |
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142 WQInfoObject obj = buildWQInfoObject(list.item(i)); |
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143 |
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144 if (obj != null) { |
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145 objects.add(obj); |
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146 } |
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147 } |
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148 |
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149 if (debug) { |
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150 logger.debug("Retrieved " + objects.size() + " wq values"); |
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151 } |
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152 |
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153 WQInfoObject [] array = (WQInfoObject[]) |
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154 objects.toArray(new WQInfoObject[objects.size()]); |
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155 |
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156 Arrays.sort(array, WQ_INFO_OBJECT_CMP); |
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157 |
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158 return array; |
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159 } |
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160 |
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161 public static final Comparator<WQInfoObject> WQ_INFO_OBJECT_CMP = |
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162 new Comparator<WQInfoObject>() { |
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163 @Override |
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164 public int compare(WQInfoObject a, WQInfoObject b) { |
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165 |
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166 // Descending by type: Qs before Ds |
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167 int cmp = a.getType().compareTo(b.getType()); |
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168 if (cmp < 0) return +1; |
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169 if (cmp > 0) return -1; |
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170 |
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171 // Ascending by value |
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172 double diff = a.getValue() - b.getValue(); |
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173 if (diff < 0d) return -1; |
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174 if (diff > 0d) return +1; |
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175 return 0; |
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176 } |
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177 }; |
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178 |
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179 /** |
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180 * Extracts information for a single wq info object and intializes an |
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181 * WQInfoObject with them. |
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182 * |
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183 * @param node The node that contains the information. |
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184 * |
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185 * @return a valid WQInfoObject. |
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186 */ |
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187 protected static WQInfoObject buildWQInfoObject(Node node) { |
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188 |
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189 String name = XMLUtils.xpathString( |
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190 node, "@name", ArtifactNamespaceContext.INSTANCE); |
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191 |
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192 String type = XMLUtils.xpathString( |
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193 node, "@type", ArtifactNamespaceContext.INSTANCE); |
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194 |
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195 String value = XMLUtils.xpathString( |
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196 node, "@value", ArtifactNamespaceContext.INSTANCE); |
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197 |
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198 String official = XMLUtils.xpathString( |
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199 node, "@official", ArtifactNamespaceContext.INSTANCE); |
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200 |
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201 if (name != null && type != null) { |
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202 try { |
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203 return new WQInfoObjectImpl( |
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204 name, |
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205 type, |
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206 new Double(value), |
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207 official != null && official.equalsIgnoreCase("true")); |
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208 } |
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209 catch (NumberFormatException nfe) { |
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210 logger.warn(nfe.getLocalizedMessage()); |
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211 } |
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212 } |
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213 |
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214 logger.warn("Invalid wq info object found."); |
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215 |
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216 return null; |
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217 } |
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218 } |
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219 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |