Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/exports/AbstractExporter.java @ 7077:0a337f0005c2 generator-refactoring

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Extended init() of OutGenerator to take name of the out to serve.
author Sascha L. Teichmann <teichmann@intevation.de>
date Fri, 20 Sep 2013 16:34:09 +0200
parents 5c6fd2c010dd
children ada424214b02
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 out name to serve. */
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70 protected String outName;
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71
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72 /** The document of the incoming out() request. */
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73 protected Document request;
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74
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75 /** The output stream where the data should be written to. */
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76 protected OutputStream out;
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77
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78 /** The CallContext object. */
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79 protected CallContext context;
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80
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81 /** The selected facet. */
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82 protected String facet;
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83
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84 /** The collection.*/
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85 protected D4EArtifactCollection collection;
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86
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87 /** The master artifact. */
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88 protected Artifact master;
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89
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90 private NumberFormat kmFormat;
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91
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92 private NumberFormat wFormat;
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93
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94 private NumberFormat qFormat;
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95
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96
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97 /**
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98 * Concrete subclasses need to use this method to write their special data
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99 * objects into the CSV document.
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100 *
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101 * @param writer The CSVWriter.
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102 */
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103 protected abstract void writeCSVData(CSVWriter writer) throws IOException;
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104
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105
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106 /**
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107 * Concrete subclasses need to use this method to write their special data
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108 * objects into the PDF document.
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109 */
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110 protected abstract void writePDF(OutputStream out);
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111
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112
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113 /**
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114 * This method enables concrete subclasses to collected its own special
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115 * data.
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116 *
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117 * @param data The artifact that stores the data that has to be
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118 * exported.
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119 */
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120 protected abstract void addData(Object data);
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121
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122 public void setup(Element config) {
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123 logger.debug("AbstractExporter.setup");
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124 }
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125
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126
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127 @Override
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128 public void init(
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129 String outName,
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130 Document request,
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131 OutputStream out,
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132 CallContext context
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133 ) {
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134 logger.debug("AbstractExporter.init");
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135
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136 this.outName = outName;
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137 this.request = request;
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138 this.out = out;
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139 this.context = context;
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140 }
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141
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142
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143 @Override
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144 public void setMasterArtifact(Artifact master) {
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145 this.master = master;
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146 }
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147
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148 /** Get the callcontext that this exporter has been initialized
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149 * with. */
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150 public CallContext getCallContext() {
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151 return this.context;
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152 }
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153
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154
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155 @Override
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59ff03ff48f1 River artifacts: Renamed FLYSArtifact(Collection) to D4EArtifact(Collection).
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156 public void setCollection(D4EArtifactCollection collection) {
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157 this.collection = collection;
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158 }
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159
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160
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161 /**
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162 * This doOut() just collects the data of multiple artifacts. Therefore, it
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163 * makes use of the addData() method which enables concrete subclasses to
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164 * store its data on its own. The real output creation takes place in the
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165 * concrete generate() methods.
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166 *
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167 * @param artifactFacet The artifact and facet.
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168 * The facet to add - NOTE: the facet needs to fit to the first
391
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169 * facet inserted into this exporter. Otherwise this artifact/facet is
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170 * skipped.
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171 * @param attr The attr document.
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172 */
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173 @Override
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174 public void doOut(
1944
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175 ArtifactAndFacet artifactFacet,
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1b35b2ddfc28 Artifacts: Introduce ThemeDocument & make stuff compileable again. THIS BREAKS THE SYSTEM! TODO: Move ThemeUtils into ThemeDocument.
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176 ThemeDocument attr,
1944
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177 boolean visible
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178 ) {
1944
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179 String name = artifactFacet.getFacetName();
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180
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181 logger.debug("AbstractExporter.doOut: " + name);
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182
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183 if (!isFacetValid(name)) {
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184 logger.warn("Facet '" + name + "' not valid. No output created!");
391
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185 return;
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186 }
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187
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188 addData(artifactFacet.getData(context));
391
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189 }
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190
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191
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192 /**
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193 * Generates an export based on a specified facet.
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194 */
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195 @Override
391
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196 public void generate()
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197 throws IOException
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198 {
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199 logger.debug("AbstractExporter.generate");
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200
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201 if (facet == null) {
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202 throw new IOException("invalid (null) facet for exporter");
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203 }
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204
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205 if (facet.equals(FACET_CSV)) {
391
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206 generateCSV();
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207 }
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208 else if (facet.equals(FACET_PDF)) {
2176
65dac9cf6ff5 Issue 138.
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209 generatePDF();
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210 }
391
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211 else {
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282c9da923ab FixA: flys/issue689: Export CSV for facet 'fix_parameters'
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212 throw new IOException(
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213 "invalid facet for exporter: '" + facet + "'");
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214 }
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215 }
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216
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217
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218 /**
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219 * Determines if the desired facet is valid for this exporter. If no facet
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220 * is currently set, <i>facet</i> is set.
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221 *
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222 * @param facet The desired facet.
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223 *
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224 * @return true, if <i>facet</i> is valid, otherwise false.
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225 */
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226 protected boolean isFacetValid(String facet) {
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5d1ba04d2f68 Refactored Formatter access to ease reuse.
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227 logger.debug("AbstractExporter.isFacetValid : " + facet + " (" + getFacet() + ")" );
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228
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229 String thisFacet = getFacet();
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230
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231 if (thisFacet == null || thisFacet.length() == 0) {
391
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232 return false;
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233 }
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234 else if (facet == null || facet.length() == 0) {
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235 return false;
391
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236 }
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237 else {
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238 return thisFacet.equals(facet);
391
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239 }
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240 }
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241
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242
445
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243 /**
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244 * Returns the name of the desired facet.
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245 *
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246 * @return the name of the desired facet.
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247 */
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248 protected String getFacet() {
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249 if (facet == null) {
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250 facet = getFacetFromRequest();
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251 }
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252
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253 return facet;
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254 }
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255
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256
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257 /**
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258 * Extracts the name of the requested facet from request document.
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259 *
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260 * @return the name of the requested facet.
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261 */
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262 protected String getFacetFromRequest() {
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263 return XMLUtils.xpathString(
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264 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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265 }
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266
416
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267
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268 protected String msg(String key, String def) {
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269 return Resources.getMsg(context.getMeta(), key, def);
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270 }
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271
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272 protected String msg(String key, String def, Object[] args) {
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273 return Resources.getMsg(context.getMeta(), key, def, args);
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274 }
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275
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276
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277 /**
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278 * This method starts CSV creation. It makes use of writeCSVData() which has
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279 * to be implemented by concrete subclasses.
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280 */
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281 protected void generateCSV()
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282 throws IOException
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283 {
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284 logger.info("AbstractExporter.generateCSV");
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285
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286 char quote = '"';
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287 char escape = '\\';
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288
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289 CSVWriter writer = new CSVWriter(
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290 new OutputStreamWriter(
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291 out,
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292 DEFAULT_CSV_CHARSET),
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293 DEFAULT_CSV_SEPARATOR, quote, escape, "\r\n");
391
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294
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295 writeCSVData(writer);
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296
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297 writer.close();
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298 }
1979
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299
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300
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301 /**
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302 * This method starts PDF creation.
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303 */
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304 protected void generatePDF()
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305 throws IOException
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306 {
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307 logger.info("AbstractExporter.generatePDF");
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308 writePDF(this.out);
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309 }
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310
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311
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312 /**
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313 * Returns an instance of <i>EmptySettings</i> currently!
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314 *
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315 * @return an instance of <i>EmptySettings</i>.
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316 */
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317 public Settings getSettings() {
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318 return new EmptySettings();
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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 * This method is not implemented. Override it in subclasses if those need a
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324 * <i>Settings</i> object.
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325 */
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326 public void setSettings(Settings settings) {
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327 // do nothing
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328 }
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329
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330
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331 /**
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332 * Returns the number formatter for kilometer values.
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333 *
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334 * @return the number formatter for kilometer values.
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335 */
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336 protected NumberFormat getKmFormatter() {
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337 if (kmFormat == null) {
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338 kmFormat = Formatter.getWaterlevelKM(context);
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339 }
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340 return kmFormat;
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341 }
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342
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343
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344 /**
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345 * Returns the number formatter for W values.
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346 *
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347 * @return the number formatter for W values.
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348 */
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349 protected NumberFormat getWFormatter() {
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350 if (wFormat == null) {
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351 wFormat = Formatter.getWaterlevelW(context);
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352 }
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353 return wFormat;
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354 }
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355
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356
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357 /**
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358 * Returns the number formatter for Q values.
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359 *
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360 * @return the number formatter for Q values.
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361 */
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362 protected NumberFormat getQFormatter() {
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363 if (qFormat == null) {
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364 qFormat = Formatter.getWaterlevelQ(context);
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365 }
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366 return qFormat;
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367 }
391
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368 }
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369 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org