Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/GaugeOverviewInfoServiceImpl.java @ 3836:06c76de19b51

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Fix NullPointerException Check if array is null before accessing its length property. flys-client/trunk@5545 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Bjoern Ricks <bjoern.ricks@intevation.de>
date Fri, 21 Sep 2012 07:59:25 +0000
parents dc505433173f
children 70976b711b7e
rev   line source
3713
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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 javax.xml.xpath.XPathConstants;
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5
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6 import org.apache.log4j.Logger;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10 import org.w3c.dom.NodeList;
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11
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12 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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13 import de.intevation.artifacts.common.utils.XMLUtils;
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14 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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15 import de.intevation.artifacts.httpclient.http.HttpClient;
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16 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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17
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18 import de.intevation.flys.client.client.services.GaugeOverviewInfoService;
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19 import de.intevation.flys.client.shared.exceptions.ServerException;
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20 import de.intevation.flys.client.shared.model.DefaultGaugeInfo;
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21 import de.intevation.flys.client.shared.model.DefaultRiverInfo;
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22 import de.intevation.flys.client.shared.model.GaugeInfo;
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23 import de.intevation.flys.client.shared.model.RiverInfo;
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24
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25 /**
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26 * @author <a href="mailto:bjoern.ricks@intevation.de">Björn Ricks</a>
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27 */
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28 public class GaugeOverviewInfoServiceImpl
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29 extends RemoteServiceServlet
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30 implements GaugeOverviewInfoService
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31 {
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32 private static final Logger logger =
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33 Logger.getLogger(GaugeOverviewInfoServiceImpl.class);
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34
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35 public static final String ERROR_NO_RIVERINFO_FOUND =
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36 "error_no_gaugeoverviewinfo_found";
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37
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38 private static final String XPATH_RIVER = "/art:gauge-info/art:river";
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39
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40 private static final String XPATH_GAUGES = "/art:gauge-info/art:gauges/art:gauge";
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41
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42 public RiverInfo getRiverInfo(String river) throws ServerException {
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43 logger.info("RiverInfoServiceImpl.getRiverInfo");
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44
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45 String url = getServletContext().getInitParameter("server-url");
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46
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47 Document doc = XMLUtils.newDocument();
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48
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49 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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50 doc,
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51 ArtifactNamespaceContext.NAMESPACE_URI,
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52 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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53
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54 Element riverele = ec.create("river");
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55 riverele.setTextContent(river);
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56
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57 doc.appendChild(riverele);
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58
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59 HttpClient client = new HttpClientImpl(url);
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60
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61 try {
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62 Document result = client.callService(url, "gaugeoverviewinfo", doc);
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63
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64 Element riverresp = (Element) XMLUtils.xpath(
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65 result,
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66 XPATH_RIVER,
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67 XPathConstants.NODE,
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68 ArtifactNamespaceContext.INSTANCE);
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69
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70 String rname = riverresp.getAttributeNS(
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71 ArtifactNamespaceContext.NAMESPACE_URI, "name");
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72 String rkmup = riverresp.getAttributeNS(
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73 ArtifactNamespaceContext.NAMESPACE_URI, "kmup");
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74 String rstart = riverresp.getAttributeNS(
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75 ArtifactNamespaceContext.NAMESPACE_URI, "start");
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76 String rend = riverresp.getAttributeNS(
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77 ArtifactNamespaceContext.NAMESPACE_URI, "end");
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78 String rwstunit = riverresp.getAttributeNS(
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79 ArtifactNamespaceContext.NAMESPACE_URI, "wstunit");
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80 String rminq = riverresp.getAttributeNS(
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81 ArtifactNamespaceContext.NAMESPACE_URI, "minq");
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82 String rmaxq = riverresp.getAttributeNS(
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83 ArtifactNamespaceContext.NAMESPACE_URI, "maxq");
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84
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85 logger.debug("River is " + rname);
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86
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87 boolean kmup = rkmup.equalsIgnoreCase("true");
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88
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89 NodeList gaugenodes = (NodeList) XMLUtils.xpath(
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90 result,
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91 XPATH_GAUGES,
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92 XPathConstants.NODESET,
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93 ArtifactNamespaceContext.INSTANCE);
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94
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95 int num = gaugenodes == null ? 0 : gaugenodes.getLength();
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96
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97 ArrayList<GaugeInfo> gauges = new ArrayList<GaugeInfo>(num);
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98
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99 if (num == 0) {
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100 logger.warn("No gauge info found.");
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101 }
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102 else {
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103 logger.debug("Found " + num + " gauges.");
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104
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105 for (int i = 0; i < num; i++) {
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106 Element gaugeele = (Element)gaugenodes.item(i);
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107
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108 String gname = gaugeele.getAttributeNS(
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109 ArtifactNamespaceContext.NAMESPACE_URI, "name");
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110 String gstart = gaugeele.getAttributeNS(
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111 ArtifactNamespaceContext.NAMESPACE_URI, "start");
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112 String gend = gaugeele.getAttributeNS(
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113 ArtifactNamespaceContext.NAMESPACE_URI, "end");
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114 String gdatum = gaugeele.getAttributeNS(
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115 ArtifactNamespaceContext.NAMESPACE_URI, "datum");
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116 String gaeo = gaugeele.getAttributeNS(
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117 ArtifactNamespaceContext.NAMESPACE_URI, "aeo");
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118 String gminq = gaugeele.getAttributeNS(
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119 ArtifactNamespaceContext.NAMESPACE_URI, "minq");
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120 String gminw = gaugeele.getAttributeNS(
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121 ArtifactNamespaceContext.NAMESPACE_URI, "minw");
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122 String gmaxq = gaugeele.getAttributeNS(
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123 ArtifactNamespaceContext.NAMESPACE_URI, "maxq");
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124 String gmaxw = gaugeele.getAttributeNS(
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125 ArtifactNamespaceContext.NAMESPACE_URI, "maxw");
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126 String gstation = gaugeele.getAttributeNS(
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127 ArtifactNamespaceContext.NAMESPACE_URI, "station");
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128
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129 logger.debug("Found gauge with name " + gname);
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130
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131 GaugeInfo gaugeinfo = new DefaultGaugeInfo(
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132 gname,
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133 kmup,
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134 parseDouble(gstation),
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135 parseDouble(gstart),
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136 parseDouble(gend),
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137 parseDouble(gdatum),
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138 parseDouble(gaeo),
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139 parseDouble(gminq),
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140 parseDouble(gmaxq),
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141 parseDouble(gminw),
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142 parseDouble(gmaxw),
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143 rwstunit
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144 );
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145
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146 gauges.add(gaugeinfo);
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147 }
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148 }
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149
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150 RiverInfo riverinfo = new DefaultRiverInfo(
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151 rname,
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152 kmup,
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153 parseDouble(rstart),
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154 parseDouble(rend),
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155 rwstunit,
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156 parseDouble(rminq),
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157 parseDouble(rmaxq),
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158 gauges);
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159
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160 logger.debug("Finished RiverInfoService.");
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161
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162 return riverinfo;
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163 }
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164 catch (ConnectionException ce) {
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165 logger.error(ce, ce);
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166 }
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167
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168 logger.warn("No gauge found");
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169 throw new ServerException(ERROR_NO_RIVERINFO_FOUND);
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170 }
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171
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172 /**
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173 * Avoids NullPointerException when parsing double value
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174 */
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175 private Double parseDouble(String value) {
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176 if (value == null || value.isEmpty()) {
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177 return null;
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178 }
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179 try {
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180 return Double.valueOf(value);
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181 }
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182 catch(NumberFormatException e) {
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183 logger.error(e, e);
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184 return null;
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185 }
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186 }
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187 }
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