Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 1077:3067e700fc13

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Minor cosmetics and docs. flys-artifacts/trunk@2574 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 25 Aug 2011 10:34:20 +0000
parents a63d79107289
children 26e19cdaed5e
rev   line source
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5a2df8677b3e Added a service that returns the MainValues of a Gauge based on a river name and a stationing.
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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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29 import de.intevation.flys.artifacts.model.MainValuesFactory;
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30 import de.intevation.flys.artifacts.model.RiverFactory;
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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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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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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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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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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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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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303 ArtifactNamespaceContext.NAMESPACE_URI,
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diff changeset
304 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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305
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306 NamedMainValue namedMainValue = mainValue.getMainValue();
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307 MainValueType mainValueType = namedMainValue.getType();
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308
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309 Element el = cr.create("mainvalue");
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310
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311 cr.addAttr(el, "value", mainValue.getValue().toString());
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312 cr.addAttr(el, "name", namedMainValue.getName());
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313 cr.addAttr(el, "type", mainValueType.getName());
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314
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315 return el;
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316 }
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317 }
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318 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org