annotate flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 5775:300c0270c576

Switch start- and stoptime if starttime is after stoptime in timeinterval importer.
author Raimund Renkert <rrenkert@intevation.de>
date Fri, 19 Apr 2013 15:40:37 +0200
parents 8fce35702908
children
rev   line source
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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.Arrays;
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5 import java.util.Comparator;
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6 import java.util.List;
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7
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8 import javax.xml.xpath.XPathConstants;
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9
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10 import org.w3c.dom.Document;
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11 import org.w3c.dom.Element;
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12 import org.w3c.dom.Node;
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13 import org.w3c.dom.NodeList;
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14
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15 import org.apache.log4j.Logger;
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16
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17 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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18
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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20 import de.intevation.artifacts.common.utils.XMLUtils;
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21
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22 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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23 import de.intevation.artifacts.httpclient.http.HttpClient;
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24 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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25
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26 import de.intevation.flys.client.shared.exceptions.ServerException;
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27 import de.intevation.flys.client.client.services.WQInfoService;
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28 import de.intevation.flys.client.shared.model.WQInfoObject;
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29 import de.intevation.flys.client.shared.model.WQInfoObjectImpl;
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30
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31
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32 /**
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33 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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34 */
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35 public class WQInfoServiceImpl
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36 extends RemoteServiceServlet
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37 implements WQInfoService
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38 {
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39 private static final Logger logger =
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40 Logger.getLogger(WQInfoServiceImpl.class);
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41
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42 public static final String ERROR_NO_WQINFO_FOUND =
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43 "error_no_wqinfo_found";
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44
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45 public static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue";
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46
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47
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48 public WQInfoObject[] getWQInfo(
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49 String locale,
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50 String river,
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51 double from,
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52 double to)
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53 throws ServerException
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54 {
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55 logger.info("WQInfoServiceImpl.getWQInfo");
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56
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57 String url = getServletContext().getInitParameter("server-url");
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58
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59 Document doc = XMLUtils.newDocument();
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60
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61 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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62 doc,
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63 ArtifactNamespaceContext.NAMESPACE_URI,
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64 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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65
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66 Element mainvalues = ec.create("mainvalues");
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67 Element riverEl = ec.create("river");
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68 Element startEl = ec.create("start");
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69 Element endEl = ec.create("end");
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70
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71 riverEl.setTextContent(river);
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72 startEl.setTextContent(Double.valueOf(from).toString());
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73 endEl.setTextContent(Double.valueOf(to).toString());
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74
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75 mainvalues.appendChild(riverEl);
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76 mainvalues.appendChild(startEl);
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77 mainvalues.appendChild(endEl);
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78
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79 doc.appendChild(mainvalues);
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80
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81 HttpClient client = new HttpClientImpl(url, locale);
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82
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83 try {
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84 Document result = client.callService(url, "mainvalues", doc);
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85
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86 logger.debug("Extract wq info objects now.");
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87 WQInfoObject[] objects = extractWQInfoObjects(result);
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88
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89 if (objects.length > 0) {
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90 return objects;
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91 }
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92 }
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93 catch (ConnectionException ce) {
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94 logger.error(ce, ce);
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95 }
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96
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97 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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98 }
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99
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100
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101 /**
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102 * Extracts all wq info objects from <i>result</i> document.
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103 *
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104 * @param result The document retrieved by the server.
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105 *
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106 * @return a list of WQInfoObjects.
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107 */
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108 protected WQInfoObject[] extractWQInfoObjects(Document result)
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109 throws ServerException
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110 {
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111 NodeList list = (NodeList) XMLUtils.xpath(
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112 result,
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113 XPATH_WQS,
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114 XPathConstants.NODESET,
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115 ArtifactNamespaceContext.INSTANCE);
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116
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117 if (list == null || list.getLength() == 0) {
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118 logger.warn("No wq info found.");
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119
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120 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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121 }
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122
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123 boolean debug = logger.isDebugEnabled();
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124
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125 int num = list.getLength();
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126 if (debug) {
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127 logger.debug("Response contains " + num + " objects.");
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128 }
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129
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130 List<WQInfoObject> objects =
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131 new ArrayList<WQInfoObject>(num);
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132
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133 for (int i = 0; i < num; i++) {
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134 WQInfoObject obj = buildWQInfoObject(list.item(i));
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135
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136 if (obj != null) {
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137 objects.add(obj);
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138 }
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139 }
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140
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141 if (debug) {
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142 logger.debug("Retrieved " + objects.size() + " wq values");
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143 }
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144
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145 WQInfoObject [] array = (WQInfoObject[])
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146 objects.toArray(new WQInfoObject[objects.size()]);
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147
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148 Arrays.sort(array, WQ_INFO_OBJECT_CMP);
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149
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150 return array;
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151 }
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152
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153 public static final Comparator<WQInfoObject> WQ_INFO_OBJECT_CMP =
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154 new Comparator<WQInfoObject>() {
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155 @Override
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156 public int compare(WQInfoObject a, WQInfoObject b) {
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157
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158 // Descending by type: Qs before Ds
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159 int cmp = a.getType().compareTo(b.getType());
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160 if (cmp < 0) return +1;
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161 if (cmp > 0) return -1;
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162
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163 // Ascending by value
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164 double diff = a.getValue() - b.getValue();
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165 if (diff < 0d) return -1;
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166 if (diff > 0d) return +1;
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167 return 0;
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168 }
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169 };
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170
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171 /**
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172 * Extracts information for a single wq info object and intializes an
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173 * WQInfoObject with them.
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174 *
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175 * @param node The node that contains the information.
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176 *
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177 * @return a valid WQInfoObject.
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178 */
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179 protected static WQInfoObject buildWQInfoObject(Node node) {
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180
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181 String name = XMLUtils.xpathString(
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182 node, "@name", ArtifactNamespaceContext.INSTANCE);
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183
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184 String type = XMLUtils.xpathString(
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185 node, "@type", ArtifactNamespaceContext.INSTANCE);
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186
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187 String value = XMLUtils.xpathString(
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188 node, "@value", ArtifactNamespaceContext.INSTANCE);
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189
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190 if (name != null && type != null) {
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191 try {
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192 return new WQInfoObjectImpl(
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193 name,
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194 type,
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195 new Double(value));
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196 }
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197 catch (NumberFormatException nfe) {
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198 logger.warn(nfe.getLocalizedMessage());
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199 }
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200 }
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201
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202 logger.warn("Invalid wq info object found.");
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203
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204 return null;
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205 }
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206 }
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207 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

http://dive4elements.wald.intevation.org