Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/services/MainValuesService.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children 35b2d86c3fb5
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.services;
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10
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11 import java.util.List;
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12
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13 import org.apache.log4j.Logger;
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14
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15 import org.w3c.dom.Document;
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16 import org.w3c.dom.Element;
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17
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18 import org.dive4elements.artifacts.CallMeta;
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19 import org.dive4elements.artifacts.GlobalContext;
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20
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21 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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22 import org.dive4elements.artifacts.common.utils.XMLUtils;
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23 import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator;
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24
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25 import org.dive4elements.river.model.Gauge;
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26 import org.dive4elements.river.model.MainValue;
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27 import org.dive4elements.river.model.MainValueType;
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28 import org.dive4elements.river.model.NamedMainValue;
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29 import org.dive4elements.river.model.Range;
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30 import org.dive4elements.river.model.River;
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31
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32 import org.dive4elements.river.artifacts.model.RiverFactory;
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33
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34
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35 /**
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36 * This service returns the main values of a river's gauge based on the start
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37 * and end point of the river.
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38 *
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39 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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40 */
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41 public class MainValuesService extends FLYSService {
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42
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43 /** The logger that is used by this service.*/
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44 private static Logger logger = Logger.getLogger(MainValuesService.class);
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45
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46
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47 /** The XPath that points to the river definition of the incoming request.*/
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48 public static final String XPATH_RIVER = "/art:mainvalues/art:river/text()";
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49
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50 /** The XPath that points to the start definition of the incoming request.*/
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51 public static final String XPATH_START = "/art:mainvalues/art:start/text()";
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52
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53 /** The XPath that points to the end definition of the incoming request.*/
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54 public static final String XPATH_END = "/art:mainvalues/art:end/text()";
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55
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56 /**
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57 * The default constructor.
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58 */
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59 public MainValuesService() {
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60 }
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61
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62 private static final Document error(String msg) {
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63 logger.debug(msg);
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64 return XMLUtils.newDocument();
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65 }
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66
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67
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68 @Override
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69 public Document doProcess(
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70 Document data,
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71 GlobalContext context,
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72 CallMeta callMeta
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73 ) {
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74 logger.debug("MainValuesService.process");
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75
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76 River river = getRequestedRiver(data);
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77 if (river == null) {
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78 return error("no river found.");
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79 }
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ad54896ec369 Write gauge determined in MainValuesService to log.
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80
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81 double[] minmax = getRequestedStartEnd(data, river);
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82 Gauge gauge = river.determineGauge(minmax[0], minmax[1]);
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84 if (gauge == null) {
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85 return error("no gauge found.");
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86 }
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88 List<MainValue> mainValues = getMainValues(river, gauge);
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89
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90 return buildDocument(river, gauge, mainValues, context);
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91 }
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94 /**
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95 * This method extracts the river from the incoming request. If no river
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96 * string was found or no river is found in the database based on this
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97 * string a NullPointerException is thrown.
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98 *
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99 * @param data The incoming request data.
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100 *
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101 * @return the River object.
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102 */
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103 protected River getRequestedRiver(Document data)
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104 throws NullPointerException
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105 {
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106 logger.debug("MainValuesService.getRiver");
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107
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108 String riverStr = XMLUtils.xpathString(
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109 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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110
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111 return riverStr != null && (riverStr = riverStr.trim()).length() > 0
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112 ? RiverFactory.getRiver(riverStr)
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113 : null;
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114 }
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115
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116
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117 /**
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118 * This method extracts the start and end point from incoming request
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119 * document and returns both values in an array. If no start and end strings
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120 * are found in the document, the min/max values of the <i>river</i> are
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121 * returned.
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122 *
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123 * @param data The incoming request data.
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124 * @param river The river of the request.
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125 *
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126 * @return the start and end point.
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127 */
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128 protected double[] getRequestedStartEnd(Document data, River river) {
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129 logger.debug("MainValuesService.getStartEnd");
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130
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131 String startStr = XMLUtils.xpathString(
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132 data, XPATH_START, ArtifactNamespaceContext.INSTANCE);
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133
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134 String endStr = XMLUtils.xpathString(
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135 data, XPATH_END, ArtifactNamespaceContext.INSTANCE);
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136
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137 if (startStr == null || endStr == null) {
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138 return river.determineMinMaxDistance();
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139 }
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140
331
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141 try {
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142 double start = Double.parseDouble(startStr);
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143 double end = Double.parseDouble(endStr);
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144
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145 if (logger.isDebugEnabled()) {
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146 logger.debug("Found start: " + start);
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147 logger.debug("Found end: " + end);
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148 }
331
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149
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150 return new double[] { start, end };
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151 }
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152 catch (NumberFormatException nfe) {
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153 logger.warn(nfe, nfe);
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154 return river.determineMinMaxDistance();
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155 }
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156 }
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157
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158
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159 /**
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160 * This method creates the result document that includes the main values of
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161 * the specified <i>gauge</i>.
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162 *
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163 * @param river The river.
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164 * @param gauge The gauge.
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165 *
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166 * @return a document that includes the main values of the specified river
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167 * at the specified gauge.
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168 */
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169 protected List<MainValue> getMainValues(River river, Gauge gauge) {
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170
331
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171 if (logger.isDebugEnabled()) {
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172 logger.debug("MainValuesService.buildMainValues");
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173 logger.debug("River: " + river.getName());
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174 logger.debug("Gauge: " + gauge.getName());
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175 }
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176
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177 List<MainValue> mainValues = gauge.getMainValues();
331
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178
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179 if (logger.isDebugEnabled()) {
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180 logger.debug(mainValues.size() + " main values found.");
331
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181 }
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182
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183 return mainValues;
331
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184 }
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185
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186
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187 protected Document buildDocument(
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188 River river,
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189 Gauge gauge,
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190 List<MainValue> mainValues,
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191 Object context)
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192 {
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193 logger.debug("MainValuesService.buildDocument");
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194
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195 Document doc = XMLUtils.newDocument();
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196
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197 ElementCreator cr = new ElementCreator(
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198 doc,
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199 ArtifactNamespaceContext.NAMESPACE_URI,
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200 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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201
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202 Element rootEl = cr.create("service");
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203 cr.addAttr(rootEl, "name", "mainvalues");
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204
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205 doc.appendChild(rootEl);
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206
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207 appendMetaInformation(doc, rootEl, river, gauge, context);
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208 appendMainValues(doc, rootEl, mainValues, context);
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209
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210 return doc;
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211 }
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212
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213
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214 /**
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215 * This method appends some meta information to the result document.
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216 * Currently, the river's and gauge's names and the gauge's range are
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217 * appended.
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218 *
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219 * @param root The root element of the result document.
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220 * @param river The river.
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221 * @param gauge The gauge.
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222 * @param context The context object.
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223 */
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224 protected void appendMetaInformation(
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225 Document doc,
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226 Element root,
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227 River river,
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228 Gauge gauge,
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229 Object context)
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230 {
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231 logger.debug("MainValuesService.appendMetaInformation");
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232
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233 ElementCreator cr = new ElementCreator(
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234 doc,
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235 ArtifactNamespaceContext.NAMESPACE_URI,
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236 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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237
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238 Range range = gauge.getRange();
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239
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240 Element riverEl = cr.create("river");
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241 cr.addAttr(riverEl, "name", river.getName());
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242
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243 Element gaugeEl = cr.create("gauge");
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244 cr.addAttr(gaugeEl, "name", gauge.getName());
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245 cr.addAttr(gaugeEl, "from", range.getA().toString());
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246 cr.addAttr(gaugeEl, "to", range.getB().toString());
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247
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248 root.appendChild(riverEl);
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249 root.appendChild(gaugeEl);
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250 }
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251
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252
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253 protected void appendMainValues(
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254 Document doc,
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255 Element root,
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256 List<MainValue> mainValues,
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257 Object context)
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258 {
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259 logger.debug("MainValuesService.appendMainValues");
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260
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261 ElementCreator cr = new ElementCreator(
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262 doc,
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263 ArtifactNamespaceContext.NAMESPACE_URI,
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264 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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265
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266 Element list = cr.create("mainvalues");
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267
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268 for (MainValue mainValue: mainValues) {
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269 Element newEl = buildMainValueElement(doc, mainValue, context);
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270
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271 if (newEl != null) {
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272 list.appendChild(newEl);
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273 }
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274 }
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275
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276 root.appendChild(list);
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277 }
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278
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279
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280 /**
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281 * This method builds a concrete mainvalue element. This element consists of
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282 * three attributes: the value, its name and its type.
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283 *
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284 * @param doc The owner document.
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285 * @param mainValue The mainvalue.
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286 * @param context The context object.
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287 *
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288 * @return a mainvalue element.
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289 */
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290 protected Element buildMainValueElement(
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291 Document doc,
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292 MainValue mainValue,
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293 Object context)
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294 {
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295 ElementCreator cr = new ElementCreator(
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296 doc,
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297 ArtifactNamespaceContext.NAMESPACE_URI,
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298 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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299
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300 NamedMainValue namedMainValue = mainValue.getMainValue();
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301 MainValueType mainValueType = namedMainValue.getType();
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302
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303 Element el = cr.create("mainvalue");
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304
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305 cr.addAttr(el, "value", mainValue.getValue().toString());
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306 cr.addAttr(el, "name", namedMainValue.getName());
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307 cr.addAttr(el, "type", mainValueType.getName());
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308
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309 return el;
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310 }
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311 }
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312 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org