Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/exports/AbstractExporter.java @ 7037:5c6fd2c010dd generator-refactoring

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Add setup(Element config) method to Generator interface to be initialized from configuration.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 18 Sep 2013 15:04:26 +0200
parents 1b35b2ddfc28
children 0a337f0005c2
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 import org.w3c.dom.Element;
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19
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20 import org.apache.log4j.Logger;
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21
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22 import au.com.bytecode.opencsv.CSVWriter;
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23
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24 import org.dive4elements.artifacts.Artifact;
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25 import org.dive4elements.artifacts.CallContext;
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26
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27 import org.dive4elements.artifactdatabase.state.ArtifactAndFacet;
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28 import org.dive4elements.artifactdatabase.state.Settings;
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29
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30 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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31 import org.dive4elements.artifacts.common.utils.XMLUtils;
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32
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33 import org.dive4elements.river.artifacts.resources.Resources;
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34 import org.dive4elements.river.collections.D4EArtifactCollection;
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35
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36 import org.dive4elements.river.themes.ThemeDocument;
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37 import org.dive4elements.river.utils.Formatter;
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38
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39
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40 /**
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41 * An abstract exporter that implements some basic methods for exporting data of
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42 * artifacts.
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43 *
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44 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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45 */
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46 public abstract class AbstractExporter implements OutGenerator {
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47
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48 /** The logger used in this exporter.*/
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49 private static Logger logger = Logger.getLogger(AbstractExporter.class);
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50
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51 /* XXX: Why does AbstractExporter do not implement FacetTypes? */
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52 public static String FIX_PARAMETERS = "fix_parameters";
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53
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54 /** The name of the CSV facet which triggers the CSV creation. */
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55 public static final String FACET_CSV = "csv";
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56
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57 /** The name of the PDF facet which triggers the PDF creation. */
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58 public static final String FACET_PDF = "pdf";
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59
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60 /** The default charset for the CSV export. */
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61 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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62
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63 /** The default separator for the CSV export. */
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64 public static final char DEFAULT_CSV_SEPARATOR = ',';
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65
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66 /** XPath that points to the desired export facet. */
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67 public static final String XPATH_FACET = "/art:action/@art:type";
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68
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69 /** The document of the incoming out() request. */
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70 protected Document request;
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71
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72 /** The output stream where the data should be written to. */
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73 protected OutputStream out;
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74
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75 /** The CallContext object. */
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76 protected CallContext context;
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77
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78 /** The selected facet. */
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79 protected String facet;
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80
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81 /** The collection.*/
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82 protected D4EArtifactCollection collection;
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83
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84 /** The master artifact. */
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85 protected Artifact master;
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86
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87 private NumberFormat kmFormat;
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88
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89 private NumberFormat wFormat;
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90
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91 private NumberFormat qFormat;
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92
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93
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94 /**
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95 * Concrete subclasses need to use this method to write their special data
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96 * objects into the CSV document.
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97 *
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98 * @param writer The CSVWriter.
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99 */
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100 protected abstract void writeCSVData(CSVWriter writer) throws IOException;
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102
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103 /**
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104 * Concrete subclasses need to use this method to write their special data
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105 * objects into the PDF document.
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106 */
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107 protected abstract void writePDF(OutputStream out);
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108
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109
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110 /**
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111 * This method enables concrete subclasses to collected its own special
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112 * data.
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113 *
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114 * @param data The artifact that stores the data that has to be
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115 * exported.
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116 */
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117 protected abstract void addData(Object data);
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118
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119 public void setup(Element config) {
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120 logger.debug("AbstractExporter.setup");
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121 }
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122
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123
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124 @Override
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125 public void init(Document request, OutputStream out, CallContext context) {
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126 logger.debug("AbstractExporter.init");
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127
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128 this.request = request;
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129 this.out = out;
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130 this.context = context;
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131 }
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132
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133
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134 @Override
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135 public void setMasterArtifact(Artifact master) {
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136 this.master = master;
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137 }
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138
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139 /** Get the callcontext that this exporter has been initialized
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140 * with. */
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141 public CallContext getCallContext() {
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142 return this.context;
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143 }
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144
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145
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146 @Override
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147 public void setCollection(D4EArtifactCollection collection) {
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148 this.collection = collection;
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149 }
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150
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151
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152 /**
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153 * This doOut() just collects the data of multiple artifacts. Therefore, it
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154 * makes use of the addData() method which enables concrete subclasses to
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155 * store its data on its own. The real output creation takes place in the
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156 * concrete generate() methods.
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157 *
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158 * @param artifactFacet The artifact and facet.
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159 * The facet to add - NOTE: the facet needs to fit to the first
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160 * facet inserted into this exporter. Otherwise this artifact/facet is
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161 * skipped.
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162 * @param attr The attr document.
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163 */
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164 @Override
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165 public void doOut(
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166 ArtifactAndFacet artifactFacet,
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167 ThemeDocument attr,
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168 boolean visible
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169 ) {
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170 String name = artifactFacet.getFacetName();
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171
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172 logger.debug("AbstractExporter.doOut: " + name);
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173
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174 if (!isFacetValid(name)) {
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175 logger.warn("Facet '" + name + "' not valid. No output created!");
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176 return;
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177 }
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178
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179 addData(artifactFacet.getData(context));
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180 }
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181
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182
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183 /**
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184 * Generates an export based on a specified facet.
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185 */
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186 @Override
391
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187 public void generate()
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188 throws IOException
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189 {
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190 logger.debug("AbstractExporter.generate");
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191
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192 if (facet == null) {
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193 throw new IOException("invalid (null) facet for exporter");
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194 }
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195
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196 if (facet.equals(FACET_CSV)) {
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197 generateCSV();
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198 }
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199 else if (facet.equals(FACET_PDF)) {
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200 generatePDF();
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201 }
391
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202 else {
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203 throw new IOException(
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204 "invalid facet for exporter: '" + facet + "'");
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205 }
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206 }
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207
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208
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209 /**
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210 * Determines if the desired facet is valid for this exporter. If no facet
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211 * is currently set, <i>facet</i> is set.
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212 *
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213 * @param facet The desired facet.
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214 *
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215 * @return true, if <i>facet</i> is valid, otherwise false.
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216 */
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217 protected boolean isFacetValid(String facet) {
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218 logger.debug("AbstractExporter.isFacetValid : " + facet + " (" + getFacet() + ")" );
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219
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220 String thisFacet = getFacet();
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221
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222 if (thisFacet == null || thisFacet.length() == 0) {
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223 return false;
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224 }
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225 else if (facet == null || facet.length() == 0) {
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226 return false;
391
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227 }
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228 else {
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229 return thisFacet.equals(facet);
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230 }
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231 }
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232
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233
445
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234 /**
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235 * Returns the name of the desired facet.
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236 *
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237 * @return the name of the desired facet.
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238 */
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239 protected String getFacet() {
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240 if (facet == null) {
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241 facet = getFacetFromRequest();
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242 }
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243
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244 return facet;
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245 }
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246
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247
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248 /**
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249 * Extracts the name of the requested facet from request document.
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250 *
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251 * @return the name of the requested facet.
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252 */
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253 protected String getFacetFromRequest() {
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254 return XMLUtils.xpathString(
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255 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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256 }
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257
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258
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259 protected String msg(String key, String def) {
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260 return Resources.getMsg(context.getMeta(), key, def);
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261 }
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262
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263 protected String msg(String key, String def, Object[] args) {
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264 return Resources.getMsg(context.getMeta(), key, def, args);
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265 }
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266
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267
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268 /**
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269 * This method starts CSV creation. It makes use of writeCSVData() which has
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270 * to be implemented by concrete subclasses.
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271 */
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272 protected void generateCSV()
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273 throws IOException
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274 {
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275 logger.info("AbstractExporter.generateCSV");
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276
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277 char quote = '"';
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278 char escape = '\\';
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279
391
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280 CSVWriter writer = new CSVWriter(
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281 new OutputStreamWriter(
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282 out,
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283 DEFAULT_CSV_CHARSET),
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284 DEFAULT_CSV_SEPARATOR, quote, escape, "\r\n");
391
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285
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286 writeCSVData(writer);
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287
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288 writer.close();
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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 * This method starts PDF creation.
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294 */
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295 protected void generatePDF()
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296 throws IOException
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297 {
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298 logger.info("AbstractExporter.generatePDF");
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299 writePDF(this.out);
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300 }
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301
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302
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303 /**
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304 * Returns an instance of <i>EmptySettings</i> currently!
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305 *
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306 * @return an instance of <i>EmptySettings</i>.
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307 */
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308 public Settings getSettings() {
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309 return new EmptySettings();
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310 }
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311
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312
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313 /**
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314 * This method is not implemented. Override it in subclasses if those need a
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315 * <i>Settings</i> object.
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316 */
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317 public void setSettings(Settings settings) {
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318 // do nothing
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319 }
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320
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321
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322 /**
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323 * Returns the number formatter for kilometer values.
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324 *
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325 * @return the number formatter for kilometer values.
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326 */
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327 protected NumberFormat getKmFormatter() {
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328 if (kmFormat == null) {
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329 kmFormat = Formatter.getWaterlevelKM(context);
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330 }
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331 return kmFormat;
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332 }
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333
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334
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335 /**
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336 * Returns the number formatter for W values.
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337 *
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338 * @return the number formatter for W values.
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339 */
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340 protected NumberFormat getWFormatter() {
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341 if (wFormat == null) {
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342 wFormat = Formatter.getWaterlevelW(context);
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343 }
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344 return wFormat;
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345 }
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346
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347
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348 /**
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349 * Returns the number formatter for Q values.
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350 *
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351 * @return the number formatter for Q values.
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352 */
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353 protected NumberFormat getQFormatter() {
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354 if (qFormat == null) {
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355 qFormat = Formatter.getWaterlevelQ(context);
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356 }
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357 return qFormat;
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358 }
391
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359 }
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360 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org