Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 4910:a707ef048188

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Insert CR and LF at the end of each line in CSV exports.
author Raimund Renkert <rrenkert@intevation.de>
date Wed, 30 Jan 2013 14:42:17 +0100
parents 118fe1cc8cc8
children baf51f820838
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 java.text.NumberFormat;
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8
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9 import org.w3c.dom.Document;
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10
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11 import org.apache.log4j.Logger;
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12
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13 import au.com.bytecode.opencsv.CSVWriter;
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14
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15 import de.intevation.artifacts.Artifact;
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16 import de.intevation.artifacts.CallContext;
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17
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18 import de.intevation.artifactdatabase.state.ArtifactAndFacet;
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19 import de.intevation.artifactdatabase.state.Settings;
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20
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21 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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22 import de.intevation.artifacts.common.utils.XMLUtils;
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23
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24 import de.intevation.flys.artifacts.resources.Resources;
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25 import de.intevation.flys.collections.FLYSArtifactCollection;
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26
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27 import de.intevation.flys.utils.Formatter;
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391
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29
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30 /**
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31 * An abstract exporter that implements some basic methods for exporting data of
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32 * artifacts.
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33 *
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34 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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35 */
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36 public abstract class AbstractExporter implements OutGenerator {
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37
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38 /** The logger used in this exporter.*/
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39 private static Logger logger = Logger.getLogger(AbstractExporter.class);
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40
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41 /* XXX: Why does AbstractExporter do not implement FacetTypes? */
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42 public static String FIX_PARAMETERS = "fix_parameters";
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43
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44 /** The name of the CSV facet which triggers the CSV creation. */
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45 public static final String FACET_CSV = "csv";
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46
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47 /** The name of the PDF facet which triggers the PDF creation. */
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48 public static final String FACET_PDF = "pdf";
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49
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50 /** The default charset for the CSV export. */
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51 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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52
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53 /** The default separator for the CSV export. */
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54 public static final char DEFAULT_CSV_SEPARATOR = ',';
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55
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56 /** XPath that points to the desired export facet. */
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57 public static final String XPATH_FACET = "/art:action/@art:type";
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58
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59 /** The document of the incoming out() request. */
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60 protected Document request;
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61
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62 /** The output stream where the data should be written to. */
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63 protected OutputStream out;
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64
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65 /** The CallContext object. */
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66 protected CallContext context;
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67
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68 /** The selected facet. */
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69 protected String facet;
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70
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71 /** The collection.*/
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72 protected FLYSArtifactCollection collection;
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73
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74 /** The master artifact. */
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75 protected Artifact master;
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76
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77
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78 /**
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79 * Concrete subclasses need to use this method to write their special data
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80 * objects into the CSV document.
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81 *
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82 * @param writer The CSVWriter.
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83 */
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84 protected abstract void writeCSVData(CSVWriter writer) throws IOException;
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85
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86
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87 /**
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88 * Concrete subclasses need to use this method to write their special data
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89 * objects into the PDF document.
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90 */
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91 protected abstract void writePDF(OutputStream out);
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92
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93
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94 /**
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95 * This method enables concrete subclasses to collected its own special
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96 * data.
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97 *
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98 * @param data The artifact that stores the data that has to be
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99 * exported.
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100 */
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101 protected abstract void addData(Object data);
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102
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103
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104 @Override
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105 public void init(Document request, OutputStream out, CallContext context) {
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106 logger.debug("AbstractExporter.init");
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107
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108 this.request = request;
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109 this.out = out;
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110 this.context = context;
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111 }
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112
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113
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114 @Override
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115 public void setMasterArtifact(Artifact master) {
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116 this.master = master;
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117 }
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119
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120 @Override
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121 public void setCollection(FLYSArtifactCollection collection) {
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122 this.collection = collection;
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123 }
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125
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126 /**
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127 * This doOut() just collects the data of multiple artifacts. Therefore, it
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128 * makes use of the addData() method which enables concrete subclasses to
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129 * store its data on its own. The real output creation takes place in the
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130 * concrete generate() methods.
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131 *
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132 * @param artifactFacet The artifact and facet.
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133 * The facet to add - NOTE: the facet needs to fit to the first
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134 * facet inserted into this exporter. Otherwise this artifact/facet is
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135 * skipped.
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136 * @param attr The attr document.
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137 */
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138 @Override
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139 public void doOut(
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140 ArtifactAndFacet artifactFacet,
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141 Document attr,
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142 boolean visible
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143 ) {
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144 String name = artifactFacet.getFacetName();
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145
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146 logger.debug("AbstractExporter.doOut: " + name);
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147
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148 if (!isFacetValid(name)) {
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149 logger.warn("Facet '" + name + "' not valid. No output created!");
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150 return;
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151 }
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152
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153 addData(artifactFacet.getData(context));
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154 }
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155
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156
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157 /**
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158 * Generates an export based on a specified facet.
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159 */
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160 @Override
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161 public void generate()
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162 throws IOException
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163 {
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164 logger.debug("AbstractExporter.generate");
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165
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166 if (facet == null) {
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167 throw new IOException("invalid (null) facet for exporter");
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168 }
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169
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170 if (facet.equals(FACET_CSV)) {
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171 generateCSV();
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172 }
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173 else if (facet.equals(FACET_PDF)) {
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174 generatePDF();
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175 }
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176 else {
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177 throw new IOException(
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178 "invalid facet for exporter: '" + facet + "'");
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179 }
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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 * Determines if the desired facet is valid for this exporter. If no facet
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185 * is currently set, <i>facet</i> is set.
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186 *
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187 * @param facet The desired facet.
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188 *
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189 * @return true, if <i>facet</i> is valid, otherwise false.
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190 */
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191 protected boolean isFacetValid(String facet) {
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192 logger.debug("AbstractExporter.isFacetValid : " + facet + " (" + getFacet() + ")" );
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193
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194 String thisFacet = getFacet();
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195
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196 if (thisFacet == null || thisFacet.length() == 0) {
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197 return false;
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198 }
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199 else if (facet == null || facet.length() == 0) {
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200 return false;
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201 }
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202 else {
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203 return thisFacet.equals(facet);
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204 }
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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 * Returns the name of the desired facet.
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210 *
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211 * @return the name of the desired facet.
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212 */
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213 protected String getFacet() {
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214 if (facet == null) {
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215 facet = getFacetFromRequest();
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216 }
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217
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218 return facet;
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219 }
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220
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221
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222 /**
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223 * Extracts the name of the requested facet from request document.
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224 *
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225 * @return the name of the requested facet.
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226 */
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227 protected String getFacetFromRequest() {
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228 return XMLUtils.xpathString(
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229 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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230 }
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231
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340dc41a7ea3 The CSV exports will now have headers.
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232
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233 protected String msg(String key, String def) {
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234 return Resources.getMsg(context.getMeta(), key, def);
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235 }
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236
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237
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238 /**
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239 * This method starts CSV creation. It makes use of writeCSVData() which has
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240 * to be implemented by concrete subclasses.
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241 */
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242 protected void generateCSV()
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243 throws IOException
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244 {
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245 logger.info("AbstractExporter.generateCSV");
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246
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247 char quote = '"';
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248 char escape = '\\';
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249
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250 CSVWriter writer = new CSVWriter(
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251 new OutputStreamWriter(
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252 out,
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253 DEFAULT_CSV_CHARSET),
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254 DEFAULT_CSV_SEPARATOR, quote, escape, "\r\n");
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255
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256 writeCSVData(writer);
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257
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258 writer.close();
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259 }
1979
a7c437c9547e Added a getSettings() operation to OutGenerator - FLYSArtifactCollection will now evaluate all available Outputs and create initial Settings using OutGenerators if the Settings for an Output is missing.
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260
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261
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262 /**
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263 * This method starts PDF creation.
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264 */
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265 protected void generatePDF()
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266 throws IOException
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267 {
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268 logger.info("AbstractExporter.generatePDF");
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269 writePDF(this.out);
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270 }
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271
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272
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273 /**
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a7c437c9547e Added a getSettings() operation to OutGenerator - FLYSArtifactCollection will now evaluate all available Outputs and create initial Settings using OutGenerators if the Settings for an Output is missing.
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274 * Returns an instance of <i>EmptySettings</i> currently!
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275 *
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276 * @return an instance of <i>EmptySettings</i>.
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277 */
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278 public Settings getSettings() {
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279 return new EmptySettings();
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280 }
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281
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282
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283 /**
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284 * This method is not implemented. Override it in subclasses if those need a
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285 * <i>Settings</i> object.
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286 */
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287 public void setSettings(Settings settings) {
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288 // do nothing
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289 }
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5d1ba04d2f68 Refactored Formatter access to ease reuse.
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290
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291
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292 /**
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293 * Returns the number formatter for kilometer values.
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294 *
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295 * @return the number formatter for kilometer values.
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296 */
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297 protected NumberFormat getKmFormatter() {
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298 return Formatter.getWaterlevelKM(context);
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299 }
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300
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301
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302 /**
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303 * Returns the number formatter for W values.
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304 *
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305 * @return the number formatter for W values.
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306 */
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307 protected NumberFormat getWFormatter() {
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308 return Formatter.getWaterlevelW(context);
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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 the number formatter for Q values.
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314 *
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315 * @return the number formatter for Q values.
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316 */
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317 protected NumberFormat getQFormatter() {
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318 return Formatter.getWaterlevelQ(context);
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319 }
391
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320 }
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321 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org