Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/org/dive4elements/river/exports/AbstractExporter.java @ 5831:bd047b71ab37

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Repaired internal references
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 12:06:39 +0200
parents flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java@8e52b4829cd1
children
rev   line source
5831
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1 package org.dive4elements.river.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 org.dive4elements.artifacts.Artifact;
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16 import org.dive4elements.artifacts.CallContext;
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18 import org.dive4elements.artifactdatabase.state.ArtifactAndFacet;
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19 import org.dive4elements.artifactdatabase.state.Settings;
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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
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24 import org.dive4elements.river.artifacts.resources.Resources;
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25 import org.dive4elements.river.collections.FLYSArtifactCollection;
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26
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27 import org.dive4elements.river.utils.Formatter;
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28
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29
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30 /**
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31 * An abstract exporter that implements some basic methods for exporting data of
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32 * artifacts.
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33 *
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34 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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35 */
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36 public abstract class AbstractExporter implements OutGenerator {
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37
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38 /** The logger used in this exporter.*/
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39 private static Logger logger = Logger.getLogger(AbstractExporter.class);
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40
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41 /* XXX: Why does AbstractExporter do not implement FacetTypes? */
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42 public static String FIX_PARAMETERS = "fix_parameters";
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43
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44 /** The name of the CSV facet which triggers the CSV creation. */
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45 public static final String FACET_CSV = "csv";
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46
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47 /** The name of the PDF facet which triggers the PDF creation. */
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48 public static final String FACET_PDF = "pdf";
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49
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50 /** The default charset for the CSV export. */
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51 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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52
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53 /** The default separator for the CSV export. */
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54 public static final char DEFAULT_CSV_SEPARATOR = ',';
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55
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56 /** XPath that points to the desired export facet. */
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57 public static final String XPATH_FACET = "/art:action/@art:type";
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58
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59 /** The document of the incoming out() request. */
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60 protected Document request;
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61
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62 /** The output stream where the data should be written to. */
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63 protected OutputStream out;
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64
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65 /** The CallContext object. */
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66 protected CallContext context;
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67
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68 /** The selected facet. */
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69 protected String facet;
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70
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71 /** The collection.*/
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72 protected FLYSArtifactCollection collection;
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73
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74 /** The master artifact. */
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75 protected Artifact master;
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76
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77 private NumberFormat kmFormat;
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78
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79 private NumberFormat wFormat;
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80
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81 private NumberFormat qFormat;
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82
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83
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84 /**
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85 * Concrete subclasses need to use this method to write their special data
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86 * objects into the CSV document.
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87 *
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88 * @param writer The CSVWriter.
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89 */
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90 protected abstract void writeCSVData(CSVWriter writer) throws IOException;
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91
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92
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93 /**
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94 * Concrete subclasses need to use this method to write their special data
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95 * objects into the PDF document.
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96 */
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97 protected abstract void writePDF(OutputStream out);
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98
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99
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100 /**
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101 * This method enables concrete subclasses to collected its own special
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102 * data.
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103 *
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104 * @param data The artifact that stores the data that has to be
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105 * exported.
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106 */
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107 protected abstract void addData(Object data);
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109
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110 @Override
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111 public void init(Document request, OutputStream out, CallContext context) {
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112 logger.debug("AbstractExporter.init");
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113
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114 this.request = request;
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115 this.out = out;
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116 this.context = context;
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117 }
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118
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119
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120 @Override
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121 public void setMasterArtifact(Artifact master) {
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122 this.master = master;
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123 }
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124
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125 /** Get the callcontext that this exporter has been initialized
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126 * with. */
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127 public CallContext getCallContext() {
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128 return this.context;
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129 }
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130
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131
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132 @Override
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133 public void setCollection(FLYSArtifactCollection collection) {
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134 this.collection = collection;
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135 }
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136
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137
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138 /**
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139 * This doOut() just collects the data of multiple artifacts. Therefore, it
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140 * makes use of the addData() method which enables concrete subclasses to
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141 * store its data on its own. The real output creation takes place in the
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142 * concrete generate() methods.
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143 *
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144 * @param artifactFacet The artifact and facet.
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145 * The facet to add - NOTE: the facet needs to fit to the first
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146 * facet inserted into this exporter. Otherwise this artifact/facet is
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147 * skipped.
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148 * @param attr The attr document.
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149 */
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150 @Override
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151 public void doOut(
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152 ArtifactAndFacet artifactFacet,
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153 Document attr,
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154 boolean visible
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155 ) {
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156 String name = artifactFacet.getFacetName();
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157
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158 logger.debug("AbstractExporter.doOut: " + name);
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159
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160 if (!isFacetValid(name)) {
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161 logger.warn("Facet '" + name + "' not valid. No output created!");
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162 return;
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163 }
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164
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165 addData(artifactFacet.getData(context));
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166 }
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167
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168
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169 /**
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170 * Generates an export based on a specified facet.
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171 */
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172 @Override
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173 public void generate()
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174 throws IOException
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175 {
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176 logger.debug("AbstractExporter.generate");
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177
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178 if (facet == null) {
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179 throw new IOException("invalid (null) facet for exporter");
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180 }
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181
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182 if (facet.equals(FACET_CSV)) {
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183 generateCSV();
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184 }
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185 else if (facet.equals(FACET_PDF)) {
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65dac9cf6ff5 Issue 138.
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186 generatePDF();
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187 }
391
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188 else {
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282c9da923ab FixA: flys/issue689: Export CSV for facet 'fix_parameters'
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189 throw new IOException(
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190 "invalid facet for exporter: '" + facet + "'");
391
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191 }
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192 }
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193
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194
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195 /**
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196 * Determines if the desired facet is valid for this exporter. If no facet
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197 * is currently set, <i>facet</i> is set.
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198 *
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199 * @param facet The desired facet.
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200 *
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201 * @return true, if <i>facet</i> is valid, otherwise false.
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202 */
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203 protected boolean isFacetValid(String facet) {
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204 logger.debug("AbstractExporter.isFacetValid : " + facet + " (" + getFacet() + ")" );
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205
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206 String thisFacet = getFacet();
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207
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208 if (thisFacet == null || thisFacet.length() == 0) {
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209 return false;
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210 }
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211 else if (facet == null || facet.length() == 0) {
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212 return false;
391
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213 }
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214 else {
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215 return thisFacet.equals(facet);
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216 }
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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 * Returns the name of the desired facet.
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222 *
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223 * @return the name of the desired facet.
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224 */
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225 protected String getFacet() {
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226 if (facet == null) {
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227 facet = getFacetFromRequest();
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228 }
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229
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230 return facet;
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231 }
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232
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233
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234 /**
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235 * Extracts the name of the requested facet from request document.
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236 *
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237 * @return the name of the requested facet.
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238 */
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239 protected String getFacetFromRequest() {
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240 return XMLUtils.xpathString(
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241 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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242 }
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243
416
340dc41a7ea3 The CSV exports will now have headers.
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244
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245 protected String msg(String key, String def) {
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246 return Resources.getMsg(context.getMeta(), key, def);
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247 }
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248
5133
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249 protected String msg(String key, String def, Object[] args) {
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250 return Resources.getMsg(context.getMeta(), key, def, args);
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251 }
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252
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253
391
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254 /**
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255 * This method starts CSV creation. It makes use of writeCSVData() which has
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256 * to be implemented by concrete subclasses.
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257 */
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258 protected void generateCSV()
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259 throws IOException
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260 {
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261 logger.info("AbstractExporter.generateCSV");
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262
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263 char quote = '"';
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264 char escape = '\\';
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265
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266 CSVWriter writer = new CSVWriter(
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267 new OutputStreamWriter(
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268 out,
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269 DEFAULT_CSV_CHARSET),
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270 DEFAULT_CSV_SEPARATOR, quote, escape, "\r\n");
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271
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272 writeCSVData(writer);
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273
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274 writer.close();
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275 }
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276
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277
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278 /**
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279 * This method starts PDF creation.
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280 */
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281 protected void generatePDF()
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282 throws IOException
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283 {
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284 logger.info("AbstractExporter.generatePDF");
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285 writePDF(this.out);
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286 }
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287
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288
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289 /**
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290 * Returns an instance of <i>EmptySettings</i> currently!
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291 *
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292 * @return an instance of <i>EmptySettings</i>.
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293 */
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294 public Settings getSettings() {
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295 return new EmptySettings();
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296 }
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297
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298
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299 /**
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300 * This method is not implemented. Override it in subclasses if those need a
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301 * <i>Settings</i> object.
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302 */
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303 public void setSettings(Settings settings) {
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304 // do nothing
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305 }
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306
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307
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308 /**
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309 * Returns the number formatter for kilometer values.
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310 *
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311 * @return the number formatter for kilometer values.
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312 */
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313 protected NumberFormat getKmFormatter() {
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314 if (kmFormat == null) {
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315 kmFormat = Formatter.getWaterlevelKM(context);
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316 }
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317 return kmFormat;
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318 }
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319
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320
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321 /**
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322 * Returns the number formatter for W values.
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323 *
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324 * @return the number formatter for W values.
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325 */
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326 protected NumberFormat getWFormatter() {
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327 if (wFormat == null) {
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328 wFormat = Formatter.getWaterlevelW(context);
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329 }
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330 return wFormat;
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331 }
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332
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333
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334 /**
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335 * Returns the number formatter for Q values.
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336 *
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337 * @return the number formatter for Q values.
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338 */
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339 protected NumberFormat getQFormatter() {
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340 if (qFormat == null) {
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341 qFormat = Formatter.getWaterlevelQ(context);
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342 }
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343 return qFormat;
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344 }
391
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345 }
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346 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org