Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 1072:80aecb01d79a
Let MainValuesArtifact have a state, outputmode and facet.
flys-artifacts/trunk@2556 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 24 Aug 2011 12:07:33 +0000 |
parents | a63d79107289 |
children | 26e19cdaed5e |
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 org.hibernate.Session; |
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11 |
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12 import de.intevation.artifacts.CallMeta; |
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13 import de.intevation.artifacts.GlobalContext; |
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14 |
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15 import de.intevation.artifactdatabase.DefaultService; |
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16 |
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17 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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18 import de.intevation.artifacts.common.utils.XMLUtils; |
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19 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; |
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20 |
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21 import de.intevation.flys.backend.SessionHolder; |
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22 import de.intevation.flys.model.Gauge; |
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23 import de.intevation.flys.model.MainValue; |
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24 import de.intevation.flys.model.MainValueType; |
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25 import de.intevation.flys.model.NamedMainValue; |
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26 import de.intevation.flys.model.Range; |
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27 import de.intevation.flys.model.River; |
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28 |
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29 import de.intevation.flys.artifacts.model.MainValuesFactory; |
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30 import de.intevation.flys.artifacts.model.RiverFactory; |
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31 |
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32 |
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33 /** |
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34 * This service returns the main values of a river's gauge based on the start |
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35 * and end point of the river. |
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36 * |
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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38 */ |
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39 public class MainValuesService extends DefaultService { |
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40 |
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41 /** The logger that is used by this service.*/ |
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42 private static Logger logger = Logger.getLogger(MainValuesService.class); |
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43 |
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44 |
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45 /** The XPath that points to the river definition of the incoming request.*/ |
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46 public static final String XPATH_RIVER = "/art:mainvalues/art:river/text()"; |
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47 |
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48 /** The XPath that points to the start definition of the incoming request.*/ |
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49 public static final String XPATH_START = "/art:mainvalues/art:start/text()"; |
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50 |
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51 /** The XPath that points to the end definition of the incoming request.*/ |
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52 public static final String XPATH_END = "/art:mainvalues/art:end/text()"; |
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53 |
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54 /** |
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55 * The default constructor. |
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56 */ |
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57 public MainValuesService() { |
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58 } |
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59 |
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60 |
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61 @Override |
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62 public Document process( |
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63 Document data, |
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64 GlobalContext context, |
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65 CallMeta callMeta |
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66 ) { |
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67 logger.debug("MainValuesService.process"); |
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68 |
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69 try { |
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70 River river = getRequestedRiver(data); |
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71 double[] minmax = getRequestedStartEnd(data, river); |
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72 Gauge gauge = river.determineGauge(minmax[0], minmax[1]); |
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73 |
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74 List<MainValue> mainValues = getMainValues(river, gauge); |
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75 |
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76 return buildDocument(river, gauge, mainValues, context); |
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77 } |
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78 catch (NullPointerException npe) { |
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79 logger.error("Could not process the request."); |
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80 logger.error(npe, npe); |
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81 |
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82 return XMLUtils.newDocument(); |
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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 /** |
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88 * This method extracts the river from the incoming request. If no river |
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89 * string was found or no river is found in the database based on this |
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90 * string a NullPointerException is thrown. |
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91 * |
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92 * @param data The incoming request data. |
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93 * |
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94 * @return the River object. |
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95 */ |
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96 protected River getRequestedRiver(Document data) |
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97 throws NullPointerException |
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98 { |
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99 logger.debug("MainValuesService.getRiver"); |
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100 |
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101 String riverStr = XMLUtils.xpathString( |
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102 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE); |
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103 |
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104 if (riverStr == null || riverStr.trim().length() == 0) { |
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105 throw new NullPointerException("No river found in the request."); |
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106 } |
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107 |
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108 River river = RiverFactory.getRiver(riverStr); |
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109 |
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110 if (river == null) { |
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111 throw new NullPointerException("No such river found: " + riverStr); |
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112 } |
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113 |
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114 return river; |
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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 try { |
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139 double start = Double.parseDouble(startStr); |
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140 double end = Double.parseDouble(endStr); |
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141 |
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142 logger.debug("Found start: " + start); |
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143 logger.debug("Found end: " + end); |
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144 |
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145 return new double[] { start, end }; |
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146 } |
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147 catch (NumberFormatException nfe) { |
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148 logger.warn(nfe, nfe); |
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149 |
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150 return river.determineMinMaxDistance(); |
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151 } |
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152 } |
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153 |
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154 |
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155 /** |
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156 * This method creates the result document that includes the main values of |
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157 * the specified <i>gauge</i>. |
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158 * |
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159 * @param river The river. |
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160 * @param gauge The gauge. |
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161 * |
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162 * @return a document that includes the main values of the specified river |
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163 * at the specified gauge. |
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164 */ |
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165 protected List<MainValue> getMainValues(River river, Gauge gauge) |
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166 throws NullPointerException |
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167 { |
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168 if (logger.isDebugEnabled()) { |
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169 logger.debug("MainValuesService.buildMainValues"); |
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170 logger.debug("River: " + river.getName()); |
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171 logger.debug("Gauge: " + gauge.getName()); |
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172 } |
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173 |
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174 Session session = SessionHolder.acquire(); |
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175 try { |
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176 List<MainValue> mainValues = MainValuesFactory.getMainValues(gauge); |
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177 |
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178 if (mainValues == null || mainValues.isEmpty()) { |
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179 throw new NullPointerException("No main values found."); |
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180 } |
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181 |
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182 logger.debug(mainValues.size() + " main values found."); |
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183 |
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184 return mainValues; |
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185 } |
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186 finally { |
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187 session.close(); |
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188 SessionHolder.release(); |
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189 } |
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190 } |
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191 |
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192 |
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193 protected Document buildDocument( |
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194 River river, |
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195 Gauge gauge, |
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196 List<MainValue> mainValues, |
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197 Object context) |
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198 { |
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199 logger.debug("MainValuesService.buildDocument"); |
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200 |
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201 Document doc = XMLUtils.newDocument(); |
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202 |
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203 ElementCreator cr = new ElementCreator( |
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204 doc, |
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205 ArtifactNamespaceContext.NAMESPACE_URI, |
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206 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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207 |
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208 Element rootEl = cr.create("service"); |
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209 cr.addAttr(rootEl, "name", "mainvalues"); |
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210 |
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211 doc.appendChild(rootEl); |
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212 |
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213 appendMetaInformation(doc, rootEl, river, gauge, context); |
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214 appendMainValues(doc, rootEl, mainValues, context); |
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215 |
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216 return doc; |
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217 } |
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218 |
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219 |
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220 /** |
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221 * This method appends some meta information to the result document. |
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222 * Currently, the river's and gauge's names and the gauge's range are |
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223 * appended. |
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224 * |
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225 * @param root The root element of the result document. |
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226 * @param river The river. |
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227 * @param gauge The gauge. |
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228 * @param context The context object. |
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229 */ |
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230 protected void appendMetaInformation( |
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231 Document doc, |
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232 Element root, |
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233 River river, |
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234 Gauge gauge, |
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235 Object context) |
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236 { |
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237 logger.debug("MainValuesService.appendMetaInformation"); |
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238 |
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239 ElementCreator cr = new ElementCreator( |
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240 doc, |
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241 ArtifactNamespaceContext.NAMESPACE_URI, |
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242 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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243 |
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244 Range range = gauge.getRange(); |
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245 |
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246 Element riverEl = cr.create("river"); |
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247 cr.addAttr(riverEl, "name", river.getName()); |
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248 |
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249 Element gaugeEl = cr.create("gauge"); |
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250 cr.addAttr(gaugeEl, "name", gauge.getName()); |
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251 cr.addAttr(gaugeEl, "from", range.getA().toString()); |
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252 cr.addAttr(gaugeEl, "to", range.getB().toString()); |
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253 |
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254 root.appendChild(riverEl); |
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255 root.appendChild(gaugeEl); |
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256 } |
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257 |
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258 |
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259 protected void appendMainValues( |
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260 Document doc, |
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261 Element root, |
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262 List<MainValue> mainValues, |
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263 Object context) |
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264 { |
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265 logger.debug("MainValuesService.appendMainValues"); |
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266 |
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267 ElementCreator cr = new ElementCreator( |
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268 doc, |
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269 ArtifactNamespaceContext.NAMESPACE_URI, |
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270 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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271 |
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272 Element list = cr.create("mainvalues"); |
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273 |
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274 for (MainValue mainValue: mainValues) { |
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275 Element newEl = buildMainValueElement(doc, mainValue, context); |
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276 |
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277 if (newEl != null) { |
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278 list.appendChild(newEl); |
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279 } |
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280 } |
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281 |
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282 root.appendChild(list); |
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283 } |
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284 |
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285 |
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286 /** |
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287 * This method builds a concrete mainvalue element. This element consists of |
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288 * three attributes: the value, its name and its type. |
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289 * |
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290 * @param doc The owner document. |
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291 * @param mainValue The mainvalue. |
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292 * @param context The context object. |
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293 * |
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294 * @return a mainvalue element. |
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295 */ |
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296 protected Element buildMainValueElement( |
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297 Document doc, |
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298 MainValue mainValue, |
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299 Object context) |
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300 { |
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301 ElementCreator cr = new ElementCreator( |
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302 doc, |
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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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303 ArtifactNamespaceContext.NAMESPACE_URI, |
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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304 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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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305 |
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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306 NamedMainValue namedMainValue = mainValue.getMainValue(); |
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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307 MainValueType mainValueType = namedMainValue.getType(); |
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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308 |
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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309 Element el = cr.create("mainvalue"); |
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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310 |
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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311 cr.addAttr(el, "value", mainValue.getValue().toString()); |
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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312 cr.addAttr(el, "name", namedMainValue.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:
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313 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:
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314 |
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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315 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:
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316 } |
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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317 } |
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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318 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |