Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/org/dive4elements/river/artifacts/services/MainValuesService.java @ 5831:bd047b71ab37

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Repaired internal references
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 12:06:39 +0200
parents flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java@0c217de0d84b
children
rev   line source
5831
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1 package org.dive4elements.river.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 org.dive4elements.artifacts.CallMeta;
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11 import org.dive4elements.artifacts.GlobalContext;
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12
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13 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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14 import org.dive4elements.artifacts.common.utils.XMLUtils;
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15 import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator;
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16
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17 import org.dive4elements.river.model.Gauge;
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18 import org.dive4elements.river.model.MainValue;
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19 import org.dive4elements.river.model.MainValueType;
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20 import org.dive4elements.river.model.NamedMainValue;
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21 import org.dive4elements.river.model.Range;
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22 import org.dive4elements.river.model.River;
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23
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24 import org.dive4elements.river.artifacts.model.RiverFactory;
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27 /**
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28 * This service returns the main values of a river's gauge based on the start
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29 * and end point of the river.
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30 *
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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32 */
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33 public class MainValuesService extends FLYSService {
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34
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35 /** The logger that is used by this service.*/
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36 private static Logger logger = Logger.getLogger(MainValuesService.class);
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38
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39 /** The XPath that points to the river definition of the incoming request.*/
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40 public static final String XPATH_RIVER = "/art:mainvalues/art:river/text()";
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42 /** The XPath that points to the start definition of the incoming request.*/
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43 public static final String XPATH_START = "/art:mainvalues/art:start/text()";
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45 /** The XPath that points to the end definition of the incoming request.*/
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46 public static final String XPATH_END = "/art:mainvalues/art:end/text()";
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47
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48 /**
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49 * The default constructor.
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50 */
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51 public MainValuesService() {
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52 }
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54 private static final Document error(String msg) {
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55 logger.debug(msg);
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56 return XMLUtils.newDocument();
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57 }
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58
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59
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60 @Override
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61 public Document doProcess(
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62 Document data,
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63 GlobalContext context,
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64 CallMeta callMeta
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65 ) {
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66 logger.debug("MainValuesService.process");
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67
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68 River river = getRequestedRiver(data);
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69 if (river == null) {
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70 return error("no river found.");
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71 }
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73 double[] minmax = getRequestedStartEnd(data, river);
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74 Gauge gauge = river.determineGauge(minmax[0], minmax[1]);
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76 if (gauge == null) {
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77 return error("no gauge found.");
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78 }
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80 List<MainValue> mainValues = getMainValues(river, gauge);
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81
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82 return buildDocument(river, gauge, mainValues, context);
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83 }
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86 /**
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87 * This method extracts the river from the incoming request. If no river
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88 * string was found or no river is found in the database based on this
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89 * string a NullPointerException is thrown.
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90 *
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91 * @param data The incoming request data.
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92 *
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93 * @return the River object.
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94 */
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95 protected River getRequestedRiver(Document data)
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96 throws NullPointerException
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97 {
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98 logger.debug("MainValuesService.getRiver");
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99
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100 String riverStr = XMLUtils.xpathString(
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101 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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102
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103 return riverStr != null && (riverStr = riverStr.trim()).length() > 0
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104 ? RiverFactory.getRiver(riverStr)
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105 : null;
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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 * This method extracts the start and end point from incoming request
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111 * document and returns both values in an array. If no start and end strings
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112 * are found in the document, the min/max values of the <i>river</i> are
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113 * returned.
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114 *
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115 * @param data The incoming request data.
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116 * @param river The river of the request.
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117 *
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118 * @return the start and end point.
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119 */
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120 protected double[] getRequestedStartEnd(Document data, River river) {
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121 logger.debug("MainValuesService.getStartEnd");
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122
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123 String startStr = XMLUtils.xpathString(
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124 data, XPATH_START, ArtifactNamespaceContext.INSTANCE);
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125
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126 String endStr = XMLUtils.xpathString(
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127 data, XPATH_END, ArtifactNamespaceContext.INSTANCE);
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128
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129 if (startStr == null || endStr == null) {
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130 return river.determineMinMaxDistance();
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131 }
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132
331
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133 try {
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134 double start = Double.parseDouble(startStr);
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135 double end = Double.parseDouble(endStr);
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136
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137 if (logger.isDebugEnabled()) {
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138 logger.debug("Found start: " + start);
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139 logger.debug("Found end: " + end);
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140 }
331
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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 return river.determineMinMaxDistance();
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147 }
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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 * This method creates the result document that includes the main values of
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153 * the specified <i>gauge</i>.
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154 *
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155 * @param river The river.
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156 * @param gauge The gauge.
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157 *
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158 * @return a document that includes the main values of the specified river
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159 * at the specified gauge.
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160 */
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161 protected List<MainValue> getMainValues(River river, Gauge gauge) {
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162
331
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163 if (logger.isDebugEnabled()) {
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164 logger.debug("MainValuesService.buildMainValues");
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165 logger.debug("River: " + river.getName());
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166 logger.debug("Gauge: " + gauge.getName());
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167 }
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168
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169 List<MainValue> mainValues = gauge.getMainValues();
331
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170
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171 if (logger.isDebugEnabled()) {
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172 logger.debug(mainValues.size() + " main values found.");
331
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173 }
1631
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174
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175 return mainValues;
331
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176 }
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177
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178
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179 protected Document buildDocument(
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180 River river,
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181 Gauge gauge,
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182 List<MainValue> mainValues,
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183 Object context)
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184 {
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185 logger.debug("MainValuesService.buildDocument");
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186
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187 Document doc = XMLUtils.newDocument();
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188
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189 ElementCreator cr = new ElementCreator(
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190 doc,
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191 ArtifactNamespaceContext.NAMESPACE_URI,
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192 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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193
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194 Element rootEl = cr.create("service");
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195 cr.addAttr(rootEl, "name", "mainvalues");
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196
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197 doc.appendChild(rootEl);
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198
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199 appendMetaInformation(doc, rootEl, river, gauge, context);
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200 appendMainValues(doc, rootEl, mainValues, context);
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201
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202 return doc;
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203 }
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204
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205
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206 /**
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207 * This method appends some meta information to the result document.
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208 * Currently, the river's and gauge's names and the gauge's range are
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209 * appended.
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210 *
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211 * @param root The root element of the result document.
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212 * @param river The river.
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213 * @param gauge The gauge.
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214 * @param context The context object.
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215 */
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216 protected void appendMetaInformation(
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217 Document doc,
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218 Element root,
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219 River river,
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220 Gauge gauge,
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221 Object context)
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222 {
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223 logger.debug("MainValuesService.appendMetaInformation");
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224
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225 ElementCreator cr = new ElementCreator(
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226 doc,
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diff changeset
227 ArtifactNamespaceContext.NAMESPACE_URI,
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228 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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229
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230 Range range = gauge.getRange();
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231
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232 Element riverEl = cr.create("river");
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233 cr.addAttr(riverEl, "name", river.getName());
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234
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235 Element gaugeEl = cr.create("gauge");
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236 cr.addAttr(gaugeEl, "name", gauge.getName());
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237 cr.addAttr(gaugeEl, "from", range.getA().toString());
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238 cr.addAttr(gaugeEl, "to", range.getB().toString());
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239
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240 root.appendChild(riverEl);
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241 root.appendChild(gaugeEl);
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242 }
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243
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244
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245 protected void appendMainValues(
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246 Document doc,
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247 Element root,
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248 List<MainValue> mainValues,
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249 Object context)
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250 {
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251 logger.debug("MainValuesService.appendMainValues");
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252
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253 ElementCreator cr = new ElementCreator(
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254 doc,
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255 ArtifactNamespaceContext.NAMESPACE_URI,
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256 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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257
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258 Element list = cr.create("mainvalues");
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259
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260 for (MainValue mainValue: mainValues) {
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261 Element newEl = buildMainValueElement(doc, mainValue, context);
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262
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263 if (newEl != null) {
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264 list.appendChild(newEl);
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265 }
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266 }
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267
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268 root.appendChild(list);
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269 }
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270
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271
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272 /**
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273 * This method builds a concrete mainvalue element. This element consists of
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274 * three attributes: the value, its name and its type.
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275 *
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276 * @param doc The owner document.
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277 * @param mainValue The mainvalue.
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278 * @param context The context object.
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279 *
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280 * @return a mainvalue element.
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281 */
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282 protected Element buildMainValueElement(
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283 Document doc,
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284 MainValue mainValue,
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285 Object context)
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286 {
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287 ElementCreator cr = new ElementCreator(
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288 doc,
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289 ArtifactNamespaceContext.NAMESPACE_URI,
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290 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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291
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292 NamedMainValue namedMainValue = mainValue.getMainValue();
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293 MainValueType mainValueType = namedMainValue.getType();
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294
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295 Element el = cr.create("mainvalue");
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296
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297 cr.addAttr(el, "value", mainValue.getValue().toString());
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298 cr.addAttr(el, "name", namedMainValue.getName());
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299 cr.addAttr(el, "type", mainValueType.getName());
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300
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301 return el;
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302 }
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303 }
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304 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org