Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 1944:21a4d2c677a1

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Changed doOut signature, side effect from blackboard feature (to come). flys-artifacts/trunk@3334 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 30 Nov 2011 10:10:42 +0000
parents bdb05dc9b763
children 65f9d707caff
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 org.w3c.dom.Document;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import au.com.bytecode.opencsv.CSVWriter;
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12
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13 import de.intevation.artifacts.Artifact;
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14 import de.intevation.artifacts.CallContext;
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15
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16 import de.intevation.artifactdatabase.state.ArtifactAndFacet;
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17 import de.intevation.artifactdatabase.state.Facet;
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18
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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20 import de.intevation.artifacts.common.utils.XMLUtils;
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21
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22 import de.intevation.flys.artifacts.resources.Resources;
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23
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24 import de.intevation.flys.artifacts.FLYSArtifact;
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391
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26
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27 /**
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28 * An abstract exporter that implements some basic methods for exporting data of
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29 * artifacts.
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30 *
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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32 */
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33 public abstract class AbstractExporter implements OutGenerator {
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34
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35 /** The logger used in this exporter.*/
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36 private static Logger logger = Logger.getLogger(AbstractExporter.class);
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37
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38
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39 /** The name of the CSV facet which triggers the CSV creation. */
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40 public static final String FACET_CSV = "csv";
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41
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42 /** The default charset for the CSV export. */
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43 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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44
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45 /** The default separator for the CSV export. */
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46 public static final char DEFAULT_CSV_SEPARATOR = ',';
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47
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48 /** XPath that points to the desired export facet. */
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49 public static final String XPATH_FACET = "/art:action/@art:type";
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51
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52 /** The document of the incoming out() request. */
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53 protected Document request;
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54
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55 /** The output stream where the data should be written to. */
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56 protected OutputStream out;
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57
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58 /** The CallContext object. */
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59 protected CallContext context;
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60
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61 /** The selected facet. */
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62 protected String facet;
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63
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64 /** The master artifact. */
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65 protected Artifact master;
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66
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67
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68 /**
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69 * Concrete subclasses need to use this method to write their special data
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70 * objects into the CSV document.
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71 *
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72 * @param writer The CSVWriter.
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73 */
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74 protected abstract void writeCSVData(CSVWriter writer);
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75
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76
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77 /**
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78 * This method enables concrete subclasses to collected its own special
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79 * data.
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80 *
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81 * @param artifacts The artifact that stores the data that has to be
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82 * exported.
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83 */
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84 protected abstract void addData(Object data);
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85
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86 @Override
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87 public void init(Document request, OutputStream out, CallContext context) {
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88 logger.debug("AbstractExporter.init");
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89
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90 this.request = request;
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91 this.out = out;
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92 this.context = context;
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93 }
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94
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95
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96 @Override
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97 public void setMasterArtifact(Artifact master) {
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98 this.master = master;
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99 }
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100
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101
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102 /**
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103 * This doOut() just collects the data of multiple artifacts. Therefore, it
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104 * makes use of the addData() method which enables concrete subclasses to
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105 * store its data on its own. The real output creation takes place in the
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106 * concrete generate() methods.
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107 *
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108 * @param artifact The artifact.
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109 * @param facet The facet to add - NOTE: the facet needs to fit to the first
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110 * facet inserted into this exporter. Otherwise this artifact/facet is
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111 * skipped.
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112 * @param attr The attr document.
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113 */
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114 @Override
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115 public void doOut(
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116 ArtifactAndFacet artifactFacet,
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117 Document attr,
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118 boolean visible
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119 ) {
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120 String name = artifactFacet.getFacetName();
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121
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122 logger.debug("AbstractExporter.doOut: " + name);
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123
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124 if (!isFacetValid(name)) {
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125 logger.warn("Facet '" + name + "' not valid. No output created!");
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126 return;
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127 }
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128
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129 addData(artifactFacet.getData(context));
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130 }
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131
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132
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133 /**
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134 * Generates an export based on a specified facet.
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135 */
710
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136 @Override
391
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137 public void generate()
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138 throws IOException
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139 {
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140 logger.debug("AbstractExporter.generate");
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141
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142 if (facet != null && facet.equals(FACET_CSV)) {
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143 generateCSV();
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144 }
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145 else {
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146 throw new IOException("invalid facet for exporter.");
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147 }
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148 }
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149
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150
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151 /**
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152 * Determines if the desired facet is valid for this exporter. If no facet
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153 * is currently set, <i>facet</i> is set.
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154 *
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155 * @param facet The desired facet.
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156 *
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157 * @return true, if <i>facet</i> is valid, otherwise false.
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158 */
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159 protected boolean isFacetValid(String facet) {
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160 logger.debug("AbstractExporter.isFacetValid");
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161
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162 String thisFacet = getFacet();
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163
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164 if (thisFacet == null || thisFacet.length() == 0) {
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165 return false;
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166 }
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167 else if (facet == null || facet.length() == 0) {
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168 return false;
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169 }
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170 else {
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171 return thisFacet.equals(facet);
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172 }
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173 }
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174
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175
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176 /**
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177 * Returns the name of the desired facet.
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178 *
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179 * @return the name of the desired facet.
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180 */
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181 protected String getFacet() {
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182 if (facet == null) {
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183 facet = getFacetFromRequest();
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184 }
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185
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186 return 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 * Extracts the name of the requested facet from request document.
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192 *
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193 * @return the name of the requested facet.
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194 */
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195 protected String getFacetFromRequest() {
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196 return XMLUtils.xpathString(
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197 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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198 }
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199
416
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200
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201 protected String msg(String key, String def) {
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202 return Resources.getMsg(context.getMeta(), key, def);
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203 }
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204
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205
391
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206 /**
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207 * This method starts CSV creation. It makes use of writeCSVData() which has
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208 * to be implemented by concrete subclasses.
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209 */
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210 protected void generateCSV()
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211 throws IOException
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212 {
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213 logger.info("AbstractExporter.generateCSV");
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214
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215 CSVWriter writer = new CSVWriter(
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216 new OutputStreamWriter(
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217 out,
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218 DEFAULT_CSV_CHARSET),
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219 DEFAULT_CSV_SEPARATOR);
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220
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221 writeCSVData(writer);
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222
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223 writer.close();
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224 }
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225 }
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226 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org