Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MainValuesService.java @ 340:b36fd8f21e6a

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Implementation of interfaces and its default implementations and a factory to work with themes. flys-artifacts/trunk@1739 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 21 Apr 2011 08:44:41 +0000
parents 5a2df8677b3e
children 932a5e3c7fa1
rev   line source
331
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
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14 import de.intevation.artifactdatabase.DefaultService;
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15
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16 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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17 import de.intevation.artifacts.common.utils.XMLUtils;
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18 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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19
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20 import de.intevation.flys.backend.SessionHolder;
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21 import de.intevation.flys.model.Gauge;
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22 import de.intevation.flys.model.MainValue;
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23 import de.intevation.flys.model.MainValueType;
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24 import de.intevation.flys.model.NamedMainValue;
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25 import de.intevation.flys.model.Range;
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26 import de.intevation.flys.model.River;
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27
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28 import de.intevation.flys.artifacts.model.MainValuesFactory;
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29 import de.intevation.flys.artifacts.model.RiverFactory;
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30
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31
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32 /**
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33 * This service returns the main values of a river's gauge based on the start
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34 * and end point of the river.
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35 *
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36 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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37 */
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38 public class MainValuesService extends DefaultService {
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39
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40 /** The logger that is used by this service.*/
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41 private static Logger logger = Logger.getLogger(MainValuesService.class);
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42
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43
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44 /** The XPath that points to the river definition of the incoming request.*/
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45 public static final String XPATH_RIVER = "/art:mainvalues/art:river/text()";
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46
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47 /** The XPath that points to the start definition of the incoming request.*/
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48 public static final String XPATH_START = "/art:mainvalues/art:end/text()";
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49
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50 /** The XPath that points to the end definition of the incoming request.*/
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51 public static final String XPATH_END = "/art:mainvalues/art:start/text()";
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52
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53 /**
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54 * The default constructor.
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55 */
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56 public MainValuesService() {
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57 }
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58
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59
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60 public Document process(
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61 Document data,
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62 Object context,
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63 CallMeta callMeta)
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64 {
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65 logger.debug("MainValuesService.process");
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66
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67 try {
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68 River river = getRequestedRiver(data);
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69 double[] minmax = getRequestedStartEnd(data, river);
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70 Gauge gauge = river.determineGauge(minmax[0], minmax[1]);
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71
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72 List<MainValue> mainValues = getMainValues(river, gauge);
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73
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74 return buildDocument(river, gauge, mainValues, context);
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75 }
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76 catch (NullPointerException npe) {
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77 logger.error("Could not process the request.");
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78 logger.error(npe, npe);
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79
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80 return XMLUtils.newDocument();
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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 /**
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86 * This method extracts the river from the incoming request. If no river
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87 * string was found or no river is found in the database based on this
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88 * string a NullPointerException is thrown.
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89 *
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90 * @param data The incoming request data.
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91 *
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92 * @return the River object.
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93 */
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94 protected River getRequestedRiver(Document data)
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95 throws NullPointerException
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96 {
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97 logger.debug("MainValuesService.getRiver");
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98
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99 String riverStr = XMLUtils.xpathString(
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100 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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101
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102 if (riverStr == null || riverStr.trim().length() == 0) {
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103 throw new NullPointerException("No river found in the request.");
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104 }
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105
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106 River river = RiverFactory.getRiver(riverStr);
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107
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108 if (river == null) {
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109 throw new NullPointerException("No such river found: " + riverStr);
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110 }
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111
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112 return river;
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113 }
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114
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115
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116 /**
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117 * This method extracts the start and end point from incoming request
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118 * document and returns both values in an array. If no start and end strings
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119 * are found in the document, the min/max values of the <i>river</i> are
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120 * returned.
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121 *
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122 * @param data The incoming request data.
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123 * @param river The river of the request.
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124 *
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125 * @return the start and end point.
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126 */
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127 protected double[] getRequestedStartEnd(Document data, River river) {
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128 logger.debug("MainValuesService.getStartEnd");
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129
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130 String startStr = XMLUtils.xpathString(
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131 data, XPATH_START, ArtifactNamespaceContext.INSTANCE);
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132
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133 String endStr = XMLUtils.xpathString(
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134 data, XPATH_END, ArtifactNamespaceContext.INSTANCE);
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135
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136 try {
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137 double start = Double.parseDouble(startStr);
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138 double end = Double.parseDouble(endStr);
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139
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140 logger.debug("Found start: " + start);
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141 logger.debug("Found end: " + end);
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142
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143 return new double[] { start, end };
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144 }
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145 catch (NumberFormatException nfe) {
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146 logger.warn(nfe, nfe);
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147
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148 return river.determineMinMaxDistance();
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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 /**
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154 * This method creates the result document that includes the main values of
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155 * the specified <i>gauge</i>.
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156 *
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157 * @param river The river.
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158 * @param gauge The gauge.
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159 *
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160 * @return a document that includes the main values of the specified river
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161 * at the specified gauge.
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162 */
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163 protected List<MainValue> getMainValues(River river, Gauge gauge)
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164 throws NullPointerException
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165 {
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166 if (logger.isDebugEnabled()) {
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167 logger.debug("MainValuesService.buildMainValues");
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168 logger.debug("River: " + river.getName());
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169 logger.debug("Gauge: " + gauge.getName());
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170 }
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171
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172 Session session = SessionHolder.acquire();
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173 try {
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174 List<MainValue> mainValues = MainValuesFactory.getMainValues(gauge);
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175
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176 if (mainValues == null || mainValues.isEmpty()) {
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177 throw new NullPointerException("No main values found.");
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178 }
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179
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180 logger.debug(mainValues.size() + " main values found.");
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181
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182 return mainValues;
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183 }
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184 finally {
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185 session.close();
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186 SessionHolder.release();
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187 }
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188 }
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189
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190
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191 protected Document buildDocument(
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192 River river,
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193 Gauge gauge,
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194 List<MainValue> mainValues,
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195 Object context)
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196 {
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197 logger.debug("MainValuesService.buildDocument");
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198
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199 Document doc = XMLUtils.newDocument();
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200
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201 ElementCreator cr = new ElementCreator(
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202 doc,
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203 ArtifactNamespaceContext.NAMESPACE_URI,
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204 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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205
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206 Element rootEl = cr.create("service");
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207 cr.addAttr(rootEl, "name", "mainvalues");
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208
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209 doc.appendChild(rootEl);
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210
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211 appendMetaInformation(doc, rootEl, river, gauge, context);
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212 appendMainValues(doc, rootEl, mainValues, context);
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213
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214 return doc;
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215 }
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216
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217
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218 /**
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219 * This method appends some meta information to the result document.
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220 * Currently, the river's and gauge's names and the gauge's range are
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221 * appended.
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222 *
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223 * @param root The root element of the result document.
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224 * @param river The river.
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225 * @param gauge The gauge.
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226 * @param context The context object.
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227 */
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228 protected void appendMetaInformation(
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229 Document doc,
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230 Element root,
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231 River river,
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232 Gauge gauge,
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233 Object context)
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234 {
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235 logger.debug("MainValuesService.appendMetaInformation");
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236
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237 ElementCreator cr = new ElementCreator(
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238 doc,
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239 ArtifactNamespaceContext.NAMESPACE_URI,
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240 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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241
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242 Range range = gauge.getRange();
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243
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244 Element riverEl = cr.create("river");
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245 cr.addAttr(riverEl, "name", river.getName());
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246
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247 Element gaugeEl = cr.create("gauge");
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248 cr.addAttr(gaugeEl, "name", gauge.getName());
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249 cr.addAttr(gaugeEl, "from", range.getA().toString());
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250 cr.addAttr(gaugeEl, "to", range.getB().toString());
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251
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252 root.appendChild(riverEl);
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253 root.appendChild(gaugeEl);
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254 }
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255
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256
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257 protected void appendMainValues(
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258 Document doc,
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259 Element root,
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260 List<MainValue> mainValues,
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261 Object context)
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262 {
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263 logger.debug("MainValuesService.appendMainValues");
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264
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265 ElementCreator cr = new ElementCreator(
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266 doc,
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267 ArtifactNamespaceContext.NAMESPACE_URI,
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268 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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269
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270 Element list = cr.create("mainvalues");
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271
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272 for (MainValue mainValue: mainValues) {
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273 Element newEl = buildMainValueElement(doc, mainValue, context);
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274
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275 if (newEl != null) {
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276 list.appendChild(newEl);
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277 }
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278 }
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279
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280 root.appendChild(list);
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281 }
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282
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283
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284 /**
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285 * This method builds a concrete mainvalue element. This element consists of
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286 * three attributes: the value, its name and its type.
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287 *
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288 * @param doc The owner document.
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289 * @param mainValue The mainvalue.
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290 * @param context The context object.
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291 *
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292 * @return a mainvalue element.
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293 */
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294 protected Element buildMainValueElement(
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295 Document doc,
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296 MainValue mainValue,
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297 Object context)
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298 {
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299 ElementCreator cr = new ElementCreator(
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300 doc,
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301 ArtifactNamespaceContext.NAMESPACE_URI,
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302 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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303
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304 NamedMainValue namedMainValue = mainValue.getMainValue();
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305 MainValueType mainValueType = namedMainValue.getType();
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306
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307 Element el = cr.create("mainvalue");
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308
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309 cr.addAttr(el, "value", mainValue.getValue().toString());
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310 cr.addAttr(el, "name", namedMainValue.getName());
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311 cr.addAttr(el, "type", mainValueType.getName());
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312
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313 return el;
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314 }
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315 }
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316 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org