Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/services/MainValuesService.java @ 6356:4c791a458305

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Artifacts: Scan the official lines associated with a main value if it applies for the current river.
author Sascha L. Teichmann <teichmann@intevation.de>
date Mon, 17 Jun 2013 21:51:04 +0200
parents e296c05a0c5b
children b07cfc319781
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.services;
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10
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11 import java.util.List;
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12
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13 import org.apache.log4j.Logger;
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14
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15 import org.w3c.dom.Document;
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16 import org.w3c.dom.Element;
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17
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18 import org.dive4elements.artifacts.CallMeta;
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19 import org.dive4elements.artifacts.GlobalContext;
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20
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21 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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22 import org.dive4elements.artifacts.common.utils.XMLUtils;
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23 import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator;
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24
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25 import org.dive4elements.river.model.Gauge;
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26 import org.dive4elements.river.model.MainValue;
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27 import org.dive4elements.river.model.MainValueType;
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28 import org.dive4elements.river.model.NamedMainValue;
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29 import org.dive4elements.river.model.OfficialLine;
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30 import org.dive4elements.river.model.Range;
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31 import org.dive4elements.river.model.River;
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32
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33 import org.dive4elements.river.artifacts.model.RiverFactory;
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34
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35
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36 /**
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37 * This service returns the main values of a river's gauge based on the start
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38 * and end point of the river.
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39 *
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40 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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41 */
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42 public class MainValuesService extends D4EService {
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43
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44 /** The logger that is used by this service.*/
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45 private static Logger logger = Logger.getLogger(MainValuesService.class);
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46
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47
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48 /** The XPath that points to the river definition of the incoming request.*/
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49 public static final String XPATH_RIVER = "/art:mainvalues/art:river/text()";
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50
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51 /** The XPath that points to the start definition of the incoming request.*/
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52 public static final String XPATH_START = "/art:mainvalues/art:start/text()";
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53
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54 /** The XPath that points to the end definition of the incoming request.*/
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55 public static final String XPATH_END = "/art:mainvalues/art:end/text()";
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56
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57 /**
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58 * The default constructor.
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59 */
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60 public MainValuesService() {
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61 }
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62
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63 private static final Document error(String msg) {
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64 logger.debug(msg);
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65 return XMLUtils.newDocument();
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66 }
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67
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68
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69 @Override
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70 public Document doProcess(
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71 Document data,
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72 GlobalContext context,
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73 CallMeta callMeta
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74 ) {
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75 logger.debug("MainValuesService.process");
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76
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77 River river = getRequestedRiver(data);
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78 if (river == null) {
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79 return error("no river found.");
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80 }
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81
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82 double[] minmax = getRequestedStartEnd(data, river);
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83 Gauge gauge = river.determineGauge(minmax[0], minmax[1]);
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85 if (gauge == null) {
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86 return error("no gauge found.");
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87 }
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89 List<MainValue> mainValues = getMainValues(river, gauge);
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90
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91 return buildDocument(river, gauge, mainValues, context);
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92 }
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93
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94
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95 /**
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96 * This method extracts the river from the incoming request. If no river
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97 * string was found or no river is found in the database based on this
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98 * string a NullPointerException is thrown.
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99 *
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100 * @param data The incoming request data.
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101 *
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102 * @return the River object.
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103 */
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104 protected River getRequestedRiver(Document data)
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105 throws NullPointerException
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106 {
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107 logger.debug("MainValuesService.getRiver");
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108
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109 String riverStr = XMLUtils.xpathString(
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110 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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111
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112 return riverStr != null && (riverStr = riverStr.trim()).length() > 0
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113 ? RiverFactory.getRiver(riverStr)
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114 : null;
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115 }
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116
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117
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118 /**
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119 * This method extracts the start and end point from incoming request
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120 * document and returns both values in an array. If no start and end strings
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121 * are found in the document, the min/max values of the <i>river</i> are
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122 * returned.
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123 *
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124 * @param data The incoming request data.
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125 * @param river The river of the request.
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126 *
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127 * @return the start and end point.
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128 */
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129 protected double[] getRequestedStartEnd(Document data, River river) {
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130 logger.debug("MainValuesService.getStartEnd");
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131
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132 String startStr = XMLUtils.xpathString(
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133 data, XPATH_START, ArtifactNamespaceContext.INSTANCE);
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134
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135 String endStr = XMLUtils.xpathString(
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136 data, XPATH_END, ArtifactNamespaceContext.INSTANCE);
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137
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138 if (startStr == null || endStr == null) {
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139 return river.determineMinMaxDistance();
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140 }
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141
331
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142 try {
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143 double start = Double.parseDouble(startStr);
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144 double end = Double.parseDouble(endStr);
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145
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146 if (logger.isDebugEnabled()) {
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147 logger.debug("Found start: " + start);
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148 logger.debug("Found end: " + end);
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149 }
331
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150
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151 return new double[] { start, end };
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152 }
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153 catch (NumberFormatException nfe) {
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154 logger.warn(nfe, nfe);
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155 return river.determineMinMaxDistance();
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156 }
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157 }
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158
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159
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160 /**
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161 * This method creates the result document that includes the main values of
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162 * the specified <i>gauge</i>.
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163 *
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164 * @param river The river.
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165 * @param gauge The gauge.
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166 *
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167 * @return a document that includes the main values of the specified river
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168 * at the specified gauge.
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169 */
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170 protected List<MainValue> getMainValues(River river, Gauge gauge) {
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171
331
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172 if (logger.isDebugEnabled()) {
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173 logger.debug("MainValuesService.buildMainValues");
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174 logger.debug("River: " + river.getName());
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175 logger.debug("Gauge: " + gauge.getName());
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176 }
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177
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178 List<MainValue> mainValues = gauge.getMainValues();
331
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179
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180 if (logger.isDebugEnabled()) {
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181 logger.debug(mainValues.size() + " main values found.");
331
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182 }
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183
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184 return mainValues;
331
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185 }
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186
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187
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188 protected Document buildDocument(
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189 River river,
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190 Gauge gauge,
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191 List<MainValue> mainValues,
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192 Object context)
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193 {
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194 logger.debug("MainValuesService.buildDocument");
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195
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196 Document doc = XMLUtils.newDocument();
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197
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198 ElementCreator cr = new ElementCreator(
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199 doc,
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200 ArtifactNamespaceContext.NAMESPACE_URI,
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201 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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202
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203 Element rootEl = cr.create("service");
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204 cr.addAttr(rootEl, "name", "mainvalues");
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205
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206 doc.appendChild(rootEl);
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207
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208 appendMetaInformation(doc, rootEl, river, gauge, context);
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4c791a458305 Artifacts: Scan the official lines associated with a main value if it applies for the current river.
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209 appendMainValues(doc, rootEl, mainValues, river.getName(), context);
331
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210
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211 return doc;
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212 }
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213
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214
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215 /**
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216 * This method appends some meta information to the result document.
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217 * Currently, the river's and gauge's names and the gauge's range are
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218 * appended.
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219 *
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220 * @param root The root element of the result document.
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221 * @param river The river.
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222 * @param gauge The gauge.
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223 * @param context The context object.
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224 */
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225 protected void appendMetaInformation(
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226 Document doc,
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227 Element root,
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228 River river,
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229 Gauge gauge,
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230 Object context)
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231 {
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232 logger.debug("MainValuesService.appendMetaInformation");
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233
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234 ElementCreator cr = new ElementCreator(
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235 doc,
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236 ArtifactNamespaceContext.NAMESPACE_URI,
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237 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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238
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239 Range range = gauge.getRange();
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240
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241 Element riverEl = cr.create("river");
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242 cr.addAttr(riverEl, "name", river.getName());
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243
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244 Element gaugeEl = cr.create("gauge");
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245 cr.addAttr(gaugeEl, "name", gauge.getName());
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246 cr.addAttr(gaugeEl, "from", range.getA().toString());
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247 cr.addAttr(gaugeEl, "to", range.getB().toString());
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248
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249 root.appendChild(riverEl);
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250 root.appendChild(gaugeEl);
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251 }
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252
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253
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254 /** Checks i a main value has an official associated, */
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255 protected static boolean hasOfficialLine(NamedMainValue nmv, String river) {
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256 for (OfficialLine ol: nmv.getOfficialLines()) {
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257 if (river.equals(ol.getWstColumn().getWst().getRiver().getName())) {
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258 return true;
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259 }
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260 }
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261 return false;
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262 }
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263
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264
331
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265 protected void appendMainValues(
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266 Document doc,
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267 Element root,
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268 List<MainValue> mainValues,
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269 String river,
331
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270 Object context)
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271 {
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272 logger.debug("MainValuesService.appendMainValues");
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273
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274 ElementCreator cr = new ElementCreator(
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275 doc,
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276 ArtifactNamespaceContext.NAMESPACE_URI,
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277 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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278
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279 Element list = cr.create("mainvalues");
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280
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281 for (MainValue mainValue: mainValues) {
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282 Element newEl = buildMainValueElement(doc, mainValue, river, context);
331
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283
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284 if (newEl != null) {
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285 list.appendChild(newEl);
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286 }
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287 }
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288
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289 root.appendChild(list);
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290 }
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291
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292
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293 /**
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294 * This method builds a concrete mainvalue element. This element consists of
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295 * three attributes: the value, its name and its type.
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296 *
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297 * @param doc The owner document.
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298 * @param mainValue The mainvalue.
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299 * @param context The context object.
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300 *
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301 * @return a mainvalue element.
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302 */
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303 protected Element buildMainValueElement(
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304 Document doc,
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305 MainValue mainValue,
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306 String river,
331
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307 Object context)
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308 {
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309 ElementCreator cr = new ElementCreator(
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310 doc,
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311 ArtifactNamespaceContext.NAMESPACE_URI,
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312 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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313
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314 NamedMainValue namedMainValue = mainValue.getMainValue();
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315 MainValueType mainValueType = namedMainValue.getType();
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316
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317 Element el = cr.create("mainvalue");
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318
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319 cr.addAttr(el, "value", mainValue.getValue().toString());
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320 cr.addAttr(el, "name", namedMainValue.getName());
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321 cr.addAttr(el, "type", mainValueType.getName());
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322
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323 if (hasOfficialLine(namedMainValue, river)) {
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324 cr.addAttr(el, "official", "true");
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325 }
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326
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327
331
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328 return el;
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329 }
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330 }
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331 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org