Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 3471:e4250c6e1538 2.8.1

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merged flys-backend/2.8.1
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:40 +0200
parents ad54896ec369
children d03e65378b9f
rev   line source
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5a2df8677b3e Added a service that returns the MainValues of a Gauge based on a river name and a stationing.
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1 package de.intevation.flys.artifacts.services;
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2
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3 import java.util.List;
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4
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5 import org.apache.log4j.Logger;
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6
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7 import org.w3c.dom.Document;
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8 import org.w3c.dom.Element;
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9
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10 import de.intevation.artifacts.CallMeta;
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11 import de.intevation.artifacts.GlobalContext;
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12
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13 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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14 import de.intevation.artifacts.common.utils.XMLUtils;
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15 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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16
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17 import de.intevation.flys.model.Gauge;
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18 import de.intevation.flys.model.MainValue;
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19 import de.intevation.flys.model.MainValueType;
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20 import de.intevation.flys.model.NamedMainValue;
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21 import de.intevation.flys.model.Range;
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22 import de.intevation.flys.model.River;
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23
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24 import de.intevation.flys.artifacts.model.MainValuesFactory;
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25 import de.intevation.flys.artifacts.model.RiverFactory;
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28 /**
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29 * This service returns the main values of a river's gauge based on the start
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30 * and end point of the river.
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31 *
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public class MainValuesService extends FLYSService {
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35
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36 /** The logger that is used by this service.*/
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37 private static Logger logger = Logger.getLogger(MainValuesService.class);
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38
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39
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40 /** The XPath that points to the river definition of the incoming request.*/
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41 public static final String XPATH_RIVER = "/art:mainvalues/art:river/text()";
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43 /** The XPath that points to the start definition of the incoming request.*/
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44 public static final String XPATH_START = "/art:mainvalues/art:start/text()";
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45
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46 /** The XPath that points to the end definition of the incoming request.*/
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47 public static final String XPATH_END = "/art:mainvalues/art:end/text()";
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49 /**
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50 * The default constructor.
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51 */
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52 public MainValuesService() {
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53 }
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55
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56 @Override
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57 public Document doProcess(
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58 Document data,
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59 GlobalContext context,
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60 CallMeta callMeta
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61 ) {
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62 logger.debug("MainValuesService.process");
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63
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64 try {
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65 River river = getRequestedRiver(data);
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66 double[] minmax = getRequestedStartEnd(data, river);
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67 Gauge gauge = river.determineGauge(minmax[0], minmax[1]);
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68
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69 logger.debug("Found gauge: " + gauge.getName());
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71 List<MainValue> mainValues = getMainValues(river, gauge);
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72
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73 return buildDocument(river, gauge, mainValues, context);
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74 }
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75 catch (NullPointerException npe) {
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76 logger.error("Could not process the request.");
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77 logger.error(npe, npe);
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78
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79 return XMLUtils.newDocument();
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80 }
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81 }
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84 /**
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85 * This method extracts the river from the incoming request. If no river
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86 * string was found or no river is found in the database based on this
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87 * string a NullPointerException is thrown.
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88 *
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89 * @param data The incoming request data.
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90 *
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91 * @return the River object.
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92 */
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93 protected River getRequestedRiver(Document data)
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94 throws NullPointerException
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95 {
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96 logger.debug("MainValuesService.getRiver");
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98 String riverStr = XMLUtils.xpathString(
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99 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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100
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101 if (riverStr == null || riverStr.trim().length() == 0) {
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102 throw new NullPointerException("No river found in the request.");
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103 }
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104
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105 River river = RiverFactory.getRiver(riverStr);
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106
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107 if (river == null) {
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108 throw new NullPointerException("No such river found: " + riverStr);
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109 }
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110
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111 return river;
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112 }
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113
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114
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115 /**
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116 * This method extracts the start and end point from incoming request
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117 * document and returns both values in an array. If no start and end strings
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118 * are found in the document, the min/max values of the <i>river</i> are
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119 * returned.
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120 *
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121 * @param data The incoming request data.
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122 * @param river The river of the request.
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123 *
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124 * @return the start and end point.
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125 */
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126 protected double[] getRequestedStartEnd(Document data, River river) {
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127 logger.debug("MainValuesService.getStartEnd");
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128
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129 String startStr = XMLUtils.xpathString(
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130 data, XPATH_START, ArtifactNamespaceContext.INSTANCE);
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131
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132 String endStr = XMLUtils.xpathString(
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133 data, XPATH_END, ArtifactNamespaceContext.INSTANCE);
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134
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135 try {
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136 double start = Double.parseDouble(startStr);
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137 double end = Double.parseDouble(endStr);
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138
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139 logger.debug("Found start: " + start);
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140 logger.debug("Found end: " + end);
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141
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142 return new double[] { start, end };
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143 }
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144 catch (NumberFormatException nfe) {
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145 logger.warn(nfe, nfe);
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146
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147 return river.determineMinMaxDistance();
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148 }
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149 }
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150
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151
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152 /**
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153 * This method creates the result document that includes the main values of
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154 * the specified <i>gauge</i>.
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155 *
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156 * @param river The river.
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157 * @param gauge The gauge.
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158 *
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159 * @return a document that includes the main values of the specified river
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160 * at the specified gauge.
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161 */
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162 protected List<MainValue> getMainValues(River river, Gauge gauge)
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163 throws NullPointerException
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164 {
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165 if (logger.isDebugEnabled()) {
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166 logger.debug("MainValuesService.buildMainValues");
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167 logger.debug("River: " + river.getName());
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168 logger.debug("Gauge: " + gauge.getName());
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169 }
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170
1631
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171 List<MainValue> mainValues = MainValuesFactory.getMainValues(gauge);
331
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172
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173 if (mainValues == null || mainValues.isEmpty()) {
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174 throw new NullPointerException("No main values found.");
331
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175 }
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176
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177 logger.debug(mainValues.size() + " main values found.");
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178
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179 return mainValues;
331
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180 }
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181
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182
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183 protected Document buildDocument(
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184 River river,
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185 Gauge gauge,
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186 List<MainValue> mainValues,
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187 Object context)
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188 {
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189 logger.debug("MainValuesService.buildDocument");
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190
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191 Document doc = XMLUtils.newDocument();
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192
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193 ElementCreator cr = new ElementCreator(
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194 doc,
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195 ArtifactNamespaceContext.NAMESPACE_URI,
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196 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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197
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198 Element rootEl = cr.create("service");
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199 cr.addAttr(rootEl, "name", "mainvalues");
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200
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201 doc.appendChild(rootEl);
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202
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203 appendMetaInformation(doc, rootEl, river, gauge, context);
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204 appendMainValues(doc, rootEl, mainValues, context);
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205
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206 return doc;
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207 }
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208
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209
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210 /**
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211 * This method appends some meta information to the result document.
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212 * Currently, the river's and gauge's names and the gauge's range are
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213 * appended.
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214 *
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215 * @param root The root element of the result document.
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216 * @param river The river.
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217 * @param gauge The gauge.
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218 * @param context The context object.
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219 */
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220 protected void appendMetaInformation(
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221 Document doc,
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222 Element root,
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223 River river,
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224 Gauge gauge,
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225 Object context)
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226 {
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227 logger.debug("MainValuesService.appendMetaInformation");
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228
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229 ElementCreator cr = new ElementCreator(
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230 doc,
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231 ArtifactNamespaceContext.NAMESPACE_URI,
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232 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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233
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234 Range range = gauge.getRange();
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235
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236 Element riverEl = cr.create("river");
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237 cr.addAttr(riverEl, "name", river.getName());
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238
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239 Element gaugeEl = cr.create("gauge");
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240 cr.addAttr(gaugeEl, "name", gauge.getName());
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241 cr.addAttr(gaugeEl, "from", range.getA().toString());
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242 cr.addAttr(gaugeEl, "to", range.getB().toString());
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243
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244 root.appendChild(riverEl);
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245 root.appendChild(gaugeEl);
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246 }
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247
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248
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249 protected void appendMainValues(
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250 Document doc,
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251 Element root,
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252 List<MainValue> mainValues,
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253 Object context)
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254 {
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255 logger.debug("MainValuesService.appendMainValues");
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256
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257 ElementCreator cr = new ElementCreator(
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258 doc,
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259 ArtifactNamespaceContext.NAMESPACE_URI,
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260 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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261
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262 Element list = cr.create("mainvalues");
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263
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264 for (MainValue mainValue: mainValues) {
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265 Element newEl = buildMainValueElement(doc, mainValue, context);
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266
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267 if (newEl != null) {
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268 list.appendChild(newEl);
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269 }
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270 }
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271
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272 root.appendChild(list);
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273 }
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274
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275
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276 /**
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277 * This method builds a concrete mainvalue element. This element consists of
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278 * three attributes: the value, its name and its type.
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279 *
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280 * @param doc The owner document.
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281 * @param mainValue The mainvalue.
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282 * @param context The context object.
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283 *
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284 * @return a mainvalue element.
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285 */
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286 protected Element buildMainValueElement(
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287 Document doc,
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288 MainValue mainValue,
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289 Object context)
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290 {
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291 ElementCreator cr = new ElementCreator(
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292 doc,
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293 ArtifactNamespaceContext.NAMESPACE_URI,
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294 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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295
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296 NamedMainValue namedMainValue = mainValue.getMainValue();
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297 MainValueType mainValueType = namedMainValue.getType();
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298
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299 Element el = cr.create("mainvalue");
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300
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301 cr.addAttr(el, "value", mainValue.getValue().toString());
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302 cr.addAttr(el, "name", namedMainValue.getName());
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303 cr.addAttr(el, "type", mainValueType.getName());
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304
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305 return el;
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306 }
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307 }
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308 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org