Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 2993:70469e3d34b9

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FixA: Made Delta W/t calculation finally work flys-artifacts/trunk@4545 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 28 May 2012 20:59:27 +0000
parents 5d1ba04d2f68
children 79dd823733e2
rev   line source
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1 package de.intevation.flys.exports;
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2
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3 import java.io.IOException;
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4 import java.io.OutputStream;
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5 import java.io.OutputStreamWriter;
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6
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7 import java.text.NumberFormat;
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8
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9 import org.w3c.dom.Document;
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10
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11 import org.apache.log4j.Logger;
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12
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13 import au.com.bytecode.opencsv.CSVWriter;
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14
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15 import de.intevation.artifacts.Artifact;
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16 import de.intevation.artifacts.CallContext;
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17
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18 import de.intevation.artifactdatabase.state.ArtifactAndFacet;
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19 import de.intevation.artifactdatabase.state.Settings;
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20
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21 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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22 import de.intevation.artifacts.common.utils.XMLUtils;
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23
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24 import de.intevation.flys.artifacts.resources.Resources;
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26 import de.intevation.flys.utils.Formatter;
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391
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28
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29 /**
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30 * An abstract exporter that implements some basic methods for exporting data of
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31 * artifacts.
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32 *
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33 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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34 */
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35 public abstract class AbstractExporter implements OutGenerator {
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36
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37 /** The logger used in this exporter.*/
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38 private static Logger logger = Logger.getLogger(AbstractExporter.class);
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39
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40
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41 /** The name of the CSV facet which triggers the CSV creation. */
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42 public static final String FACET_CSV = "csv";
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43
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44 /** The name of the PDF facet which triggers the PDF creation. */
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45 public static final String FACET_PDF = "pdf";
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47 /** The default charset for the CSV export. */
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48 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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49
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50 /** The default separator for the CSV export. */
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51 public static final char DEFAULT_CSV_SEPARATOR = ',';
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52
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53 /** XPath that points to the desired export facet. */
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54 public static final String XPATH_FACET = "/art:action/@art:type";
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56
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57 /** The document of the incoming out() request. */
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58 protected Document request;
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59
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60 /** The output stream where the data should be written to. */
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61 protected OutputStream out;
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62
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63 /** The CallContext object. */
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64 protected CallContext context;
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65
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66 /** The selected facet. */
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67 protected String facet;
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68
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69 /** The master artifact. */
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70 protected Artifact master;
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71
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72
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73 /**
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74 * Concrete subclasses need to use this method to write their special data
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75 * objects into the CSV document.
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76 *
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77 * @param writer The CSVWriter.
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78 */
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79 protected abstract void writeCSVData(CSVWriter writer) throws IOException;
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80
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81
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82 /**
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83 * Concrete subclasses need to use this method to write their special data
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84 * objects into the PDF document.
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85 */
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86 protected abstract void writePDF(OutputStream out);
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87
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88
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89 /**
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90 * This method enables concrete subclasses to collected its own special
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91 * data.
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92 *
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93 * @param artifacts The artifact that stores the data that has to be
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94 * exported.
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95 */
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96 protected abstract void addData(Object data);
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97
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98 @Override
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99 public void init(Document request, OutputStream out, CallContext context) {
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100 logger.debug("AbstractExporter.init");
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101
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102 this.request = request;
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103 this.out = out;
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104 this.context = context;
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105 }
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106
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107
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108 @Override
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109 public void setMasterArtifact(Artifact master) {
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110 this.master = master;
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111 }
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112
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113
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114 /**
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115 * This doOut() just collects the data of multiple artifacts. Therefore, it
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116 * makes use of the addData() method which enables concrete subclasses to
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117 * store its data on its own. The real output creation takes place in the
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118 * concrete generate() methods.
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119 *
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120 * @param artifact The artifact.
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121 * @param facet The facet to add - NOTE: the facet needs to fit to the first
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122 * facet inserted into this exporter. Otherwise this artifact/facet is
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123 * skipped.
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124 * @param attr The attr document.
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125 */
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126 @Override
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127 public void doOut(
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128 ArtifactAndFacet artifactFacet,
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129 Document attr,
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130 boolean visible
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131 ) {
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132 String name = artifactFacet.getFacetName();
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133
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134 logger.debug("AbstractExporter.doOut: " + name);
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135
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136 if (!isFacetValid(name)) {
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137 logger.warn("Facet '" + name + "' not valid. No output created!");
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138 return;
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139 }
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140
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141 addData(artifactFacet.getData(context));
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142 }
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143
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144
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145 /**
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146 * Generates an export based on a specified facet.
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147 */
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148 @Override
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149 public void generate()
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150 throws IOException
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151 {
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152 logger.debug("AbstractExporter.generate");
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153
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154 if (facet != null && facet.equals(FACET_CSV)) {
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155 generateCSV();
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156 }
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157 else if (facet != null && facet.equals(FACET_PDF)) {
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158 generatePDF();
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159 }
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160 else {
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161 throw new IOException("invalid facet for exporter.");
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162 }
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163 }
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164
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165
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166 /**
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167 * Determines if the desired facet is valid for this exporter. If no facet
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168 * is currently set, <i>facet</i> is set.
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169 *
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170 * @param facet The desired facet.
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171 *
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172 * @return true, if <i>facet</i> is valid, otherwise false.
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173 */
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174 protected boolean isFacetValid(String facet) {
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5d1ba04d2f68 Refactored Formatter access to ease reuse.
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175 logger.debug("AbstractExporter.isFacetValid : " + facet + " (" + getFacet() + ")" );
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176
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177 String thisFacet = getFacet();
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178
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179 if (thisFacet == null || thisFacet.length() == 0) {
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180 return false;
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181 }
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182 else if (facet == null || facet.length() == 0) {
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183 return false;
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184 }
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185 else {
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186 return thisFacet.equals(facet);
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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 /**
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192 * Returns the name of the desired facet.
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193 *
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194 * @return the name of the desired facet.
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195 */
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196 protected String getFacet() {
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197 if (facet == null) {
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198 facet = getFacetFromRequest();
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199 }
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200
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201 return facet;
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202 }
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203
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204
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205 /**
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206 * Extracts the name of the requested facet from request document.
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207 *
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208 * @return the name of the requested facet.
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209 */
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210 protected String getFacetFromRequest() {
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211 return XMLUtils.xpathString(
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212 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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213 }
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214
416
340dc41a7ea3 The CSV exports will now have headers.
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215
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216 protected String msg(String key, String def) {
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217 return Resources.getMsg(context.getMeta(), key, def);
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218 }
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219
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220
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221 /**
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222 * This method starts CSV creation. It makes use of writeCSVData() which has
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223 * to be implemented by concrete subclasses.
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224 */
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225 protected void generateCSV()
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226 throws IOException
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227 {
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228 logger.info("AbstractExporter.generateCSV");
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229
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230 CSVWriter writer = new CSVWriter(
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231 new OutputStreamWriter(
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232 out,
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233 DEFAULT_CSV_CHARSET),
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234 DEFAULT_CSV_SEPARATOR);
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235
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236 writeCSVData(writer);
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237
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238 writer.close();
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239 }
1979
a7c437c9547e Added a getSettings() operation to OutGenerator - FLYSArtifactCollection will now evaluate all available Outputs and create initial Settings using OutGenerators if the Settings for an Output is missing.
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240
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241
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242 /**
2176
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243 * This method starts PDF creation.
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244 */
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245 protected void generatePDF()
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246 throws IOException
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247 {
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248 logger.info("AbstractExporter.generatePDF");
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249 writePDF(this.out);
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250 }
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251
65dac9cf6ff5 Issue 138.
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252
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253 /**
1979
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254 * Returns an instance of <i>EmptySettings</i> currently!
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255 *
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256 * @return an instance of <i>EmptySettings</i>.
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257 */
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258 public Settings getSettings() {
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259 return new EmptySettings();
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260 }
2047
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261
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262
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263 /**
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264 * This method is not implemented. Override it in subclasses if those need a
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265 * <i>Settings</i> object.
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266 */
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267 public void setSettings(Settings settings) {
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268 // do nothing
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269 }
2284
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270
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271
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272 /**
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273 * Returns the number formatter for kilometer values.
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274 *
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275 * @return the number formatter for kilometer values.
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276 */
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277 protected NumberFormat getKmFormatter() {
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278 return Formatter.getWaterlevelKM(context);
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279 }
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280
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281
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282 /**
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283 * Returns the number formatter for W values.
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284 *
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285 * @return the number formatter for W values.
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286 */
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287 protected NumberFormat getWFormatter() {
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288 return Formatter.getWaterlevelW(context);
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289 }
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290
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291
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292 /**
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293 * Returns the number formatter for Q values.
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294 *
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295 * @return the number formatter for Q values.
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296 */
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297 protected NumberFormat getQFormatter() {
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298 return Formatter.getWaterlevelQ(context);
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299 }
391
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300 }
5d6988836f01 Added an exporter to export the computed data of a duration curve.
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301 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org