Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 4313:c72fc256b368
Add new EXTREME_WQ_CURVE Facet Type.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Tue, 30 Oct 2012 06:57:18 +0100 |
parents | 0c217de0d84b |
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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.RiverFactory; |
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25 |
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26 |
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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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37 |
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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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41 |
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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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44 |
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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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53 |
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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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72 |
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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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75 |
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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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79 |
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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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84 |
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85 |
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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; |
331
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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 |
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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(); |
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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."); |
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173 } |
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174 |
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175 return mainValues; |
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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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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 } |
5a2df8677b3e
Added a service that returns the MainValues of a Gauge based on a river name and a stationing.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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