Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/exports/AbstractExporter.java @ 6905:1b35b2ddfc28

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Artifacts: Introduce ThemeDocument & make stuff compileable again. THIS BREAKS THE SYSTEM! TODO: Move ThemeUtils into ThemeDocument.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 22 Aug 2013 23:31:38 +0200
parents af13ceeba52a
children e61bb712ee41 5c6fd2c010dd
rev   line source
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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.exports;
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10
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11 import java.io.IOException;
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12 import java.io.OutputStream;
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13 import java.io.OutputStreamWriter;
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14
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15 import java.text.NumberFormat;
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16
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17 import org.w3c.dom.Document;
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18
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19 import org.apache.log4j.Logger;
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20
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21 import au.com.bytecode.opencsv.CSVWriter;
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22
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23 import org.dive4elements.artifacts.Artifact;
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24 import org.dive4elements.artifacts.CallContext;
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25
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26 import org.dive4elements.artifactdatabase.state.ArtifactAndFacet;
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27 import org.dive4elements.artifactdatabase.state.Settings;
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28
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29 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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30 import org.dive4elements.artifacts.common.utils.XMLUtils;
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31
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32 import org.dive4elements.river.artifacts.resources.Resources;
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33 import org.dive4elements.river.collections.D4EArtifactCollection;
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34
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35 import org.dive4elements.river.themes.ThemeDocument;
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36 import org.dive4elements.river.utils.Formatter;
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37
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38
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39 /**
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40 * An abstract exporter that implements some basic methods for exporting data of
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41 * artifacts.
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42 *
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43 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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44 */
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45 public abstract class AbstractExporter implements OutGenerator {
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46
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47 /** The logger used in this exporter.*/
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48 private static Logger logger = Logger.getLogger(AbstractExporter.class);
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49
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50 /* XXX: Why does AbstractExporter do not implement FacetTypes? */
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51 public static String FIX_PARAMETERS = "fix_parameters";
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52
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53 /** The name of the CSV facet which triggers the CSV creation. */
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54 public static final String FACET_CSV = "csv";
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55
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56 /** The name of the PDF facet which triggers the PDF creation. */
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57 public static final String FACET_PDF = "pdf";
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58
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59 /** The default charset for the CSV export. */
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60 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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61
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62 /** The default separator for the CSV export. */
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63 public static final char DEFAULT_CSV_SEPARATOR = ',';
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64
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65 /** XPath that points to the desired export facet. */
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66 public static final String XPATH_FACET = "/art:action/@art:type";
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67
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68 /** The document of the incoming out() request. */
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69 protected Document request;
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70
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71 /** The output stream where the data should be written to. */
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72 protected OutputStream out;
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73
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74 /** The CallContext object. */
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75 protected CallContext context;
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76
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77 /** The selected facet. */
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78 protected String facet;
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79
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80 /** The collection.*/
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81 protected D4EArtifactCollection collection;
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82
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83 /** The master artifact. */
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84 protected Artifact master;
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85
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86 private NumberFormat kmFormat;
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87
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88 private NumberFormat wFormat;
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89
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90 private NumberFormat qFormat;
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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 CSV document.
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96 *
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97 * @param writer The CSVWriter.
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98 */
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99 protected abstract void writeCSVData(CSVWriter writer) throws IOException;
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100
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101
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102 /**
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103 * Concrete subclasses need to use this method to write their special data
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104 * objects into the PDF document.
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105 */
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106 protected abstract void writePDF(OutputStream out);
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107
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108
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109 /**
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110 * This method enables concrete subclasses to collected its own special
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111 * data.
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112 *
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113 * @param data The artifact that stores the data that has to be
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114 * exported.
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115 */
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116 protected abstract void addData(Object data);
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117
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118
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119 @Override
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120 public void init(Document request, OutputStream out, CallContext context) {
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121 logger.debug("AbstractExporter.init");
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122
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123 this.request = request;
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124 this.out = out;
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125 this.context = context;
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126 }
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127
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128
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129 @Override
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130 public void setMasterArtifact(Artifact master) {
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131 this.master = master;
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132 }
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133
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134 /** Get the callcontext that this exporter has been initialized
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135 * with. */
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136 public CallContext getCallContext() {
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137 return this.context;
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138 }
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139
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140
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141 @Override
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142 public void setCollection(D4EArtifactCollection collection) {
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143 this.collection = collection;
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144 }
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145
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146
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147 /**
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148 * This doOut() just collects the data of multiple artifacts. Therefore, it
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149 * makes use of the addData() method which enables concrete subclasses to
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150 * store its data on its own. The real output creation takes place in the
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151 * concrete generate() methods.
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152 *
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153 * @param artifactFacet The artifact and facet.
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154 * The facet to add - NOTE: the facet needs to fit to the first
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155 * facet inserted into this exporter. Otherwise this artifact/facet is
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156 * skipped.
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157 * @param attr The attr document.
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158 */
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159 @Override
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160 public void doOut(
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161 ArtifactAndFacet artifactFacet,
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162 ThemeDocument attr,
1944
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163 boolean visible
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164 ) {
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165 String name = artifactFacet.getFacetName();
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166
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167 logger.debug("AbstractExporter.doOut: " + name);
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168
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169 if (!isFacetValid(name)) {
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170 logger.warn("Facet '" + name + "' not valid. No output created!");
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171 return;
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172 }
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173
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174 addData(artifactFacet.getData(context));
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175 }
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176
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177
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178 /**
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179 * Generates an export based on a specified facet.
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180 */
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181 @Override
391
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182 public void generate()
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183 throws IOException
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184 {
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185 logger.debug("AbstractExporter.generate");
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186
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187 if (facet == null) {
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188 throw new IOException("invalid (null) facet for exporter");
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189 }
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190
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191 if (facet.equals(FACET_CSV)) {
391
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192 generateCSV();
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193 }
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194 else if (facet.equals(FACET_PDF)) {
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65dac9cf6ff5 Issue 138.
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195 generatePDF();
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196 }
391
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197 else {
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198 throw new IOException(
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199 "invalid facet for exporter: '" + facet + "'");
391
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200 }
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201 }
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202
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203
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204 /**
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205 * Determines if the desired facet is valid for this exporter. If no facet
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206 * is currently set, <i>facet</i> is set.
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207 *
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208 * @param facet The desired facet.
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209 *
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210 * @return true, if <i>facet</i> is valid, otherwise false.
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211 */
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212 protected boolean isFacetValid(String facet) {
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5d1ba04d2f68 Refactored Formatter access to ease reuse.
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213 logger.debug("AbstractExporter.isFacetValid : " + facet + " (" + getFacet() + ")" );
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214
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215 String thisFacet = getFacet();
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216
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217 if (thisFacet == null || thisFacet.length() == 0) {
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218 return false;
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219 }
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220 else if (facet == null || facet.length() == 0) {
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221 return false;
391
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222 }
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223 else {
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224 return thisFacet.equals(facet);
391
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225 }
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226 }
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227
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228
445
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229 /**
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230 * Returns the name of the desired facet.
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231 *
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232 * @return the name of the desired facet.
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233 */
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234 protected String getFacet() {
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235 if (facet == null) {
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236 facet = getFacetFromRequest();
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237 }
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238
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239 return facet;
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240 }
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241
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242
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243 /**
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244 * Extracts the name of the requested facet from request document.
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245 *
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246 * @return the name of the requested facet.
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247 */
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248 protected String getFacetFromRequest() {
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249 return XMLUtils.xpathString(
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250 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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251 }
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252
416
340dc41a7ea3 The CSV exports will now have headers.
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253
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254 protected String msg(String key, String def) {
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255 return Resources.getMsg(context.getMeta(), key, def);
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256 }
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257
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258 protected String msg(String key, String def, Object[] args) {
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259 return Resources.getMsg(context.getMeta(), key, def, args);
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260 }
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261
416
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262
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263 /**
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264 * This method starts CSV creation. It makes use of writeCSVData() which has
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265 * to be implemented by concrete subclasses.
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266 */
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267 protected void generateCSV()
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268 throws IOException
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269 {
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270 logger.info("AbstractExporter.generateCSV");
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271
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272 char quote = '"';
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273 char escape = '\\';
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274
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275 CSVWriter writer = new CSVWriter(
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276 new OutputStreamWriter(
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277 out,
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278 DEFAULT_CSV_CHARSET),
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279 DEFAULT_CSV_SEPARATOR, quote, escape, "\r\n");
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280
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281 writeCSVData(writer);
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282
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283 writer.close();
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284 }
1979
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285
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286
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287 /**
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288 * This method starts PDF creation.
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289 */
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290 protected void generatePDF()
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291 throws IOException
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292 {
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293 logger.info("AbstractExporter.generatePDF");
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294 writePDF(this.out);
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295 }
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296
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297
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298 /**
1979
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299 * Returns an instance of <i>EmptySettings</i> currently!
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300 *
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301 * @return an instance of <i>EmptySettings</i>.
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302 */
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303 public Settings getSettings() {
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304 return new EmptySettings();
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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 * This method is not implemented. Override it in subclasses if those need a
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310 * <i>Settings</i> object.
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311 */
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312 public void setSettings(Settings settings) {
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313 // do nothing
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314 }
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315
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316
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317 /**
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318 * Returns the number formatter for kilometer values.
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319 *
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320 * @return the number formatter for kilometer values.
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321 */
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322 protected NumberFormat getKmFormatter() {
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323 if (kmFormat == null) {
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324 kmFormat = Formatter.getWaterlevelKM(context);
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325 }
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326 return kmFormat;
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327 }
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328
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329
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330 /**
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331 * Returns the number formatter for W values.
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332 *
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333 * @return the number formatter for W values.
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334 */
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335 protected NumberFormat getWFormatter() {
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336 if (wFormat == null) {
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337 wFormat = Formatter.getWaterlevelW(context);
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338 }
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339 return wFormat;
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340 }
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341
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342
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343 /**
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344 * Returns the number formatter for Q values.
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345 *
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346 * @return the number formatter for Q values.
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347 */
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348 protected NumberFormat getQFormatter() {
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349 if (qFormat == null) {
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350 qFormat = Formatter.getWaterlevelQ(context);
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351 }
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352 return qFormat;
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353 }
391
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354 }
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355 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org