Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 2089:0da8874bd378

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Added initial state to map artifact to be able to advance and step back. The map artifact overrides describe() to have the complete UI information in the describe response document. flys-artifacts/trunk@3613 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Raimund Renkert <raimund.renkert@intevation.de>
date Fri, 06 Jan 2012 12:02:10 +0000
parents ad54896ec369
children d03e65378b9f
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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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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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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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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68
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69 logger.debug("Found gauge: " + gauge.getName());
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70
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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