annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 1631:26e19cdaed5e

Improved database session handling in services and artifacts. flys-artifacts/trunk@2807 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 22 Sep 2011 10:07:22 +0000
parents a63d79107289
children ad54896ec369
rev   line source
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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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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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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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42
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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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54
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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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69 List<MainValue> mainValues = getMainValues(river, gauge);
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70
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71 return buildDocument(river, gauge, mainValues, context);
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72 }
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73 catch (NullPointerException npe) {
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74 logger.error("Could not process the request.");
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75 logger.error(npe, npe);
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76
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77 return XMLUtils.newDocument();
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78 }
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79 }
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80
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81
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82 /**
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83 * This method extracts the river from the incoming request. If no river
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84 * string was found or no river is found in the database based on this
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85 * string a NullPointerException is thrown.
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86 *
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87 * @param data The incoming request data.
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88 *
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89 * @return the River object.
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90 */
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91 protected River getRequestedRiver(Document data)
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92 throws NullPointerException
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93 {
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94 logger.debug("MainValuesService.getRiver");
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95
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96 String riverStr = XMLUtils.xpathString(
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97 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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98
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99 if (riverStr == null || riverStr.trim().length() == 0) {
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100 throw new NullPointerException("No river found in the request.");
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101 }
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102
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103 River river = RiverFactory.getRiver(riverStr);
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104
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105 if (river == null) {
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106 throw new NullPointerException("No such river found: " + riverStr);
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107 }
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108
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109 return river;
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110 }
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111
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112
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113 /**
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114 * This method extracts the start and end point from incoming request
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115 * document and returns both values in an array. If no start and end strings
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116 * are found in the document, the min/max values of the <i>river</i> are
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117 * returned.
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118 *
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119 * @param data The incoming request data.
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120 * @param river The river of the request.
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121 *
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122 * @return the start and end point.
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123 */
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124 protected double[] getRequestedStartEnd(Document data, River river) {
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125 logger.debug("MainValuesService.getStartEnd");
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126
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127 String startStr = XMLUtils.xpathString(
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128 data, XPATH_START, ArtifactNamespaceContext.INSTANCE);
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129
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130 String endStr = XMLUtils.xpathString(
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131 data, XPATH_END, ArtifactNamespaceContext.INSTANCE);
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132
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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 logger.debug("Found start: " + start);
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138 logger.debug("Found end: " + end);
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139
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140 return new double[] { start, end };
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141 }
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142 catch (NumberFormatException nfe) {
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143 logger.warn(nfe, nfe);
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144
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145 return river.determineMinMaxDistance();
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146 }
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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 * This method creates the result document that includes the main values of
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152 * the specified <i>gauge</i>.
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153 *
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154 * @param river The river.
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155 * @param gauge The gauge.
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156 *
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157 * @return a document that includes the main values of the specified river
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158 * at the specified gauge.
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159 */
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160 protected List<MainValue> getMainValues(River river, Gauge gauge)
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161 throws NullPointerException
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162 {
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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
1631
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169 List<MainValue> mainValues = MainValuesFactory.getMainValues(gauge);
331
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170
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171 if (mainValues == null || mainValues.isEmpty()) {
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172 throw new NullPointerException("No main values found.");
331
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173 }
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174
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175 logger.debug(mainValues.size() + " main values found.");
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176
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177 return mainValues;
331
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178 }
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179
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180
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181 protected Document buildDocument(
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182 River river,
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183 Gauge gauge,
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184 List<MainValue> mainValues,
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185 Object context)
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186 {
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187 logger.debug("MainValuesService.buildDocument");
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188
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189 Document doc = XMLUtils.newDocument();
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190
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191 ElementCreator cr = new ElementCreator(
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192 doc,
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193 ArtifactNamespaceContext.NAMESPACE_URI,
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194 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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195
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196 Element rootEl = cr.create("service");
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197 cr.addAttr(rootEl, "name", "mainvalues");
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198
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199 doc.appendChild(rootEl);
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200
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201 appendMetaInformation(doc, rootEl, river, gauge, context);
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202 appendMainValues(doc, rootEl, mainValues, context);
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203
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204 return doc;
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205 }
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206
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207
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208 /**
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209 * This method appends some meta information to the result document.
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210 * Currently, the river's and gauge's names and the gauge's range are
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211 * appended.
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212 *
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213 * @param root The root element of the result document.
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214 * @param river The river.
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215 * @param gauge The gauge.
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216 * @param context The context object.
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217 */
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218 protected void appendMetaInformation(
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219 Document doc,
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220 Element root,
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221 River river,
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222 Gauge gauge,
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223 Object context)
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224 {
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225 logger.debug("MainValuesService.appendMetaInformation");
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226
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227 ElementCreator cr = new ElementCreator(
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228 doc,
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229 ArtifactNamespaceContext.NAMESPACE_URI,
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230 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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231
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232 Range range = gauge.getRange();
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233
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234 Element riverEl = cr.create("river");
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235 cr.addAttr(riverEl, "name", river.getName());
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236
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237 Element gaugeEl = cr.create("gauge");
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238 cr.addAttr(gaugeEl, "name", gauge.getName());
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239 cr.addAttr(gaugeEl, "from", range.getA().toString());
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240 cr.addAttr(gaugeEl, "to", range.getB().toString());
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241
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242 root.appendChild(riverEl);
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243 root.appendChild(gaugeEl);
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244 }
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245
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246
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247 protected void appendMainValues(
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248 Document doc,
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249 Element root,
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250 List<MainValue> mainValues,
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251 Object context)
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252 {
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253 logger.debug("MainValuesService.appendMainValues");
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254
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255 ElementCreator cr = new ElementCreator(
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256 doc,
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257 ArtifactNamespaceContext.NAMESPACE_URI,
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258 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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259
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260 Element list = cr.create("mainvalues");
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261
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262 for (MainValue mainValue: mainValues) {
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263 Element newEl = buildMainValueElement(doc, mainValue, context);
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264
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265 if (newEl != null) {
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266 list.appendChild(newEl);
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267 }
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268 }
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269
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270 root.appendChild(list);
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271 }
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272
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273
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274 /**
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275 * This method builds a concrete mainvalue element. This element consists of
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276 * three attributes: the value, its name and its type.
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277 *
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278 * @param doc The owner document.
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279 * @param mainValue The mainvalue.
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280 * @param context The context object.
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281 *
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282 * @return a mainvalue element.
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283 */
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284 protected Element buildMainValueElement(
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285 Document doc,
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286 MainValue mainValue,
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287 Object context)
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288 {
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289 ElementCreator cr = new ElementCreator(
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290 doc,
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291 ArtifactNamespaceContext.NAMESPACE_URI,
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292 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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293
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294 NamedMainValue namedMainValue = mainValue.getMainValue();
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295 MainValueType mainValueType = namedMainValue.getType();
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296
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297 Element el = cr.create("mainvalue");
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298
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299 cr.addAttr(el, "value", mainValue.getValue().toString());
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300 cr.addAttr(el, "name", namedMainValue.getName());
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301 cr.addAttr(el, "type", mainValueType.getName());
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302
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303 return el;
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304 }
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305 }
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306 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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