Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 5102:baf51f820838

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AbstractExporter: Added getter for CallContext.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 26 Feb 2013 11:48:25 +0100
parents a707ef048188
children 4898376c680b
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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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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27 import de.intevation.flys.utils.Formatter;
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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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118
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119 /** Get the callcontext that this exporter has been initialized
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120 * with. */
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121 public CallContext getCallContext() {
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122 return this.context;
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123 }
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124
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125
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126 @Override
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127 public void setCollection(FLYSArtifactCollection collection) {
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128 this.collection = collection;
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129 }
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130
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131
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132 /**
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133 * This doOut() just collects the data of multiple artifacts. Therefore, it
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134 * makes use of the addData() method which enables concrete subclasses to
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135 * store its data on its own. The real output creation takes place in the
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136 * concrete generate() methods.
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137 *
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138 * @param artifactFacet The artifact and facet.
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139 * The facet to add - NOTE: the facet needs to fit to the first
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140 * facet inserted into this exporter. Otherwise this artifact/facet is
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141 * skipped.
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142 * @param attr The attr document.
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143 */
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144 @Override
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145 public void doOut(
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146 ArtifactAndFacet artifactFacet,
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147 Document attr,
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148 boolean visible
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149 ) {
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150 String name = artifactFacet.getFacetName();
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151
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152 logger.debug("AbstractExporter.doOut: " + name);
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153
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154 if (!isFacetValid(name)) {
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155 logger.warn("Facet '" + name + "' not valid. No output created!");
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156 return;
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157 }
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158
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159 addData(artifactFacet.getData(context));
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160 }
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161
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162
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163 /**
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164 * Generates an export based on a specified facet.
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165 */
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166 @Override
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167 public void generate()
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168 throws IOException
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169 {
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170 logger.debug("AbstractExporter.generate");
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171
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172 if (facet == null) {
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173 throw new IOException("invalid (null) facet for exporter");
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174 }
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175
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176 if (facet.equals(FACET_CSV)) {
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177 generateCSV();
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178 }
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179 else if (facet.equals(FACET_PDF)) {
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180 generatePDF();
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181 }
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182 else {
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183 throw new IOException(
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184 "invalid facet for exporter: '" + facet + "'");
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185 }
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186 }
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187
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188
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189 /**
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190 * Determines if the desired facet is valid for this exporter. If no facet
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191 * is currently set, <i>facet</i> is set.
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192 *
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193 * @param facet The desired facet.
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194 *
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195 * @return true, if <i>facet</i> is valid, otherwise false.
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196 */
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197 protected boolean isFacetValid(String facet) {
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198 logger.debug("AbstractExporter.isFacetValid : " + facet + " (" + getFacet() + ")" );
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199
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200 String thisFacet = getFacet();
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201
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202 if (thisFacet == null || thisFacet.length() == 0) {
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203 return false;
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204 }
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205 else if (facet == null || facet.length() == 0) {
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206 return false;
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207 }
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208 else {
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209 return thisFacet.equals(facet);
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210 }
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211 }
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212
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213
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214 /**
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215 * Returns the name of the desired facet.
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216 *
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217 * @return the name of the desired facet.
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218 */
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219 protected String getFacet() {
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220 if (facet == null) {
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221 facet = getFacetFromRequest();
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222 }
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223
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224 return facet;
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225 }
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226
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227
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228 /**
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229 * Extracts the name of the requested facet from request document.
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230 *
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231 * @return the name of the requested facet.
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232 */
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233 protected String getFacetFromRequest() {
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234 return XMLUtils.xpathString(
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235 request, XPATH_FACET, ArtifactNamespaceContext.INSTANCE);
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236 }
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237
416
340dc41a7ea3 The CSV exports will now have headers.
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238
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239 protected String msg(String key, String def) {
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240 return Resources.getMsg(context.getMeta(), key, def);
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241 }
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242
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243
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244 /**
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245 * This method starts CSV creation. It makes use of writeCSVData() which has
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246 * to be implemented by concrete subclasses.
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247 */
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248 protected void generateCSV()
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249 throws IOException
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250 {
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251 logger.info("AbstractExporter.generateCSV");
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252
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253 char quote = '"';
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254 char escape = '\\';
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255
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256 CSVWriter writer = new CSVWriter(
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257 new OutputStreamWriter(
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258 out,
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259 DEFAULT_CSV_CHARSET),
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260 DEFAULT_CSV_SEPARATOR, quote, escape, "\r\n");
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261
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262 writeCSVData(writer);
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263
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264 writer.close();
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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 PDF creation.
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270 */
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271 protected void generatePDF()
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272 throws IOException
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273 {
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274 logger.info("AbstractExporter.generatePDF");
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275 writePDF(this.out);
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276 }
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277
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278
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279 /**
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280 * Returns an instance of <i>EmptySettings</i> currently!
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281 *
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282 * @return an instance of <i>EmptySettings</i>.
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283 */
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284 public Settings getSettings() {
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285 return new EmptySettings();
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286 }
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287
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288
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289 /**
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290 * This method is not implemented. Override it in subclasses if those need a
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291 * <i>Settings</i> object.
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292 */
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293 public void setSettings(Settings settings) {
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294 // do nothing
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295 }
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296
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297
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298 /**
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299 * Returns the number formatter for kilometer values.
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300 *
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301 * @return the number formatter for kilometer values.
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302 */
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303 protected NumberFormat getKmFormatter() {
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304 return Formatter.getWaterlevelKM(context);
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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 * Returns the number formatter for W values.
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310 *
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311 * @return the number formatter for W values.
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312 */
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313 protected NumberFormat getWFormatter() {
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314 return Formatter.getWaterlevelW(context);
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315 }
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316
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317
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318 /**
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319 * Returns the number formatter for Q values.
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320 *
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321 * @return the number formatter for Q values.
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322 */
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323 protected NumberFormat getQFormatter() {
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324 return Formatter.getWaterlevelQ(context);
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325 }
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326 }
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327 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org