Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/AbstractMainValuesServiceImpl.java @ 9288:82c67b859aa7

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bundu.bezugswst worklflow incl. service impl for mainValues to be calculated
author gernotbelger
date Tue, 24 Jul 2018 10:39:03 +0200
parents
children bc9a45d2b1fa
rev   line source
9288
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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.Calendar;
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14 import java.util.Comparator;
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15 import java.util.List;
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16
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17 import javax.xml.xpath.XPathConstants;
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18
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19 import org.apache.log4j.Logger;
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20 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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21 import org.dive4elements.artifacts.common.utils.XMLUtils;
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22 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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23 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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24 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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25 import org.dive4elements.river.client.shared.exceptions.ServerException;
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26 import org.dive4elements.river.client.shared.model.WQInfoObject;
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27 import org.dive4elements.river.client.shared.model.WQInfoObjectImpl;
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28 import org.w3c.dom.Document;
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29 import org.w3c.dom.Element;
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30 import org.w3c.dom.Node;
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31 import org.w3c.dom.NodeList;
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32
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33 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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34
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35 /**
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36 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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37 */
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38 abstract class AbstractMainValuesServiceImpl extends RemoteServiceServlet {
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39
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40 private static final Logger log = Logger.getLogger(DynamicMainValuesServiceImpl.class);
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41
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42 private static final Comparator<WQInfoObject> WQ_INFO_OBJECT_CMP = new Comparator<WQInfoObject>() {
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43 @Override
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44 public int compare(final WQInfoObject a, final WQInfoObject b) {
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45
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46 // Descending by type: Qs before Ds
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47 final int cmp = a.getType().compareTo(b.getType());
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48 if (cmp < 0)
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49 return +1;
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50 if (cmp > 0)
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51 return -1;
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52
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53 // Ascending by value
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54 final double diff = a.getValue() - b.getValue();
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55 if (diff < 0d)
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56 return -1;
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57 if (diff > 0d)
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58 return +1;
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59 return 0;
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60 }
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61 };
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62
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63 private static final String ERROR_NO_WQINFO_FOUND = "error_no_wqinfo_found";
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64
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65 private static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue";
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66
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67 private static final long serialVersionUID = 1L;
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68
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69 protected final Document createInput(final String river, final double from, final double to, final Integer startYear, final Integer endYear) {
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70
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71 final Document input = XMLUtils.newDocument();
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72
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73 final XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(input, ArtifactNamespaceContext.NAMESPACE_URI,
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74 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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75
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76 final Element mainvalues = ec.create("mainvalues");
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77
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78 final Element riverEl = ec.create("river");
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79 riverEl.setTextContent(river);
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80 mainvalues.appendChild(riverEl);
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81
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82 final Element startEl = ec.create("start");
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83 startEl.setTextContent(Double.valueOf(from).toString());
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84 mainvalues.appendChild(startEl);
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85
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86 final Element endEl = ec.create("end");
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87 endEl.setTextContent(Double.valueOf(to).toString());
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88 mainvalues.appendChild(endEl);
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89
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90 if (startYear != null) {
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91 final Element startYearElement = ec.create("startYear");
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92 startYearElement.setTextContent(Integer.toString(startYear));
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93 mainvalues.appendChild(startYearElement);
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94 }
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95
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96 if (endYear != null) {
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97 final Element endYearElement = ec.create("endYear");
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98 endYearElement.setTextContent(Integer.toString(endYear));
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99 mainvalues.appendChild(endYearElement);
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100 }
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101
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102 input.appendChild(mainvalues);
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103
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104 return input;
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105 }
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106
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107 protected final WQInfoObject[] callService(final String serviceName, final Document input, final String locale) throws ServerException {
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108 final String url = getServletContext().getInitParameter("server-url");
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109
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110 final HttpClient client = new HttpClientImpl(url, locale);
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111
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112 try {
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113 final Document result = client.callService(url, serviceName, input);
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114
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115 log.debug("Extract wq info objects now.");
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116 final WQInfoObject[] objects = extractWQInfoObjects(result);
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117
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118 if (objects.length > 0) {
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119 return objects;
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120 }
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121 }
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122 catch (final ConnectionException ce) {
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123 log.error(ce, ce);
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124 }
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125
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126 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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127 }
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128
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129 /**
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130 * Extracts all wq info objects from <i>result</i> document.
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131 *
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132 * @param result
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133 * The document retrieved by the server.
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134 *
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135 * @return a list of WQInfoObjects.
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136 */
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137 private WQInfoObject[] extractWQInfoObjects(final Document result) throws ServerException {
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138 final NodeList list = (NodeList) XMLUtils.xpath(result, XPATH_WQS, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE);
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139
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140 if (list == null || list.getLength() == 0) {
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141 log.warn("No wq info found.");
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142
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143 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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144 }
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145
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146 final boolean debug = log.isDebugEnabled();
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147
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148 final int num = list.getLength();
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149 if (debug) {
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150 log.debug("Response contains " + num + " objects.");
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151 }
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152
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153 final List<WQInfoObject> objects = new ArrayList<WQInfoObject>(num);
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154
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155 for (int i = 0; i < num; i++) {
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156 final WQInfoObject obj = buildWQInfoObject(list.item(i));
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157
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158 if (obj != null) {
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159 objects.add(obj);
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160 }
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161 }
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162
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163 if (debug) {
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164 log.debug("Retrieved " + objects.size() + " wq values");
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165 }
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166
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167 final WQInfoObject[] array = objects.toArray(new WQInfoObject[objects.size()]);
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168
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169 Arrays.sort(array, WQ_INFO_OBJECT_CMP);
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170
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171 return array;
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172 }
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173
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174 /**
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175 * Extracts information for a single wq info object and intializes an
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176 * WQInfoObject with them.
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177 *
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178 * @param node
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179 * The node that contains the information.
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180 *
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181 * @return a valid WQInfoObject.
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182 */
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183 private static WQInfoObject buildWQInfoObject(final Node node) {
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184
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185 final String name = XMLUtils.xpathString(node, "@name", ArtifactNamespaceContext.INSTANCE);
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186
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187 final String type = XMLUtils.xpathString(node, "@type", ArtifactNamespaceContext.INSTANCE);
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188
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189 final String value = XMLUtils.xpathString(node, "@value", ArtifactNamespaceContext.INSTANCE);
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190
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191 final String official = XMLUtils.xpathString(node, "@official", ArtifactNamespaceContext.INSTANCE);
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192
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193 final String starttime = XMLUtils.xpathString(node, "@starttime", ArtifactNamespaceContext.INSTANCE);
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194
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195 final String stoptime = XMLUtils.xpathString(node, "@stoptime", ArtifactNamespaceContext.INSTANCE);
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196
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197 if (name != null && type != null) {
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198 try {
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199 final Calendar cal = Calendar.getInstance();
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200 java.util.Date start = null;
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201 java.util.Date stop = null;
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202 if (!starttime.equals("")) {
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203 cal.setTimeInMillis(Long.parseLong(starttime));
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204 start = cal.getTime();
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205 }
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206 if (!stoptime.equals("")) {
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207 cal.setTimeInMillis(Long.parseLong(stoptime));
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208 stop = cal.getTime();
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209 }
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210 return new WQInfoObjectImpl(name, type, new Double(value), official != null && official.equalsIgnoreCase("true"), start, stop);
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211 }
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212 catch (final NumberFormatException nfe) {
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213 log.warn(nfe.getLocalizedMessage());
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214 }
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215 }
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216
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217 log.warn("Invalid wq info object found.");
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218
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219 return null;
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220 }
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221 }
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