Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 2029:131842fc6581
Enable basicst area rendering in longitudinal section diagrams.
flys-artifacts/trunk@3491 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Tue, 20 Dec 2011 11:30:00 +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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26 |
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27 |
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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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48 |
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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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82 |
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83 |
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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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97 |
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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()); |
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:
diff
changeset
|
304 |
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:
diff
changeset
|
305 return el; |
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:
diff
changeset
|
306 } |
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:
diff
changeset
|
307 } |
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:
diff
changeset
|
308 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |