Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 416:340dc41a7ea3
The CSV exports will now have headers.
flys-artifacts/trunk@1880 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 10 May 2011 13:18:03 +0000 |
parents | 046bd86ae41d |
children | e0fec407a280 |
rev | line source |
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391
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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 org.w3c.dom.Document; |
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8 |
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9 import org.apache.log4j.Logger; |
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10 |
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11 import au.com.bytecode.opencsv.CSVWriter; |
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12 |
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13 import de.intevation.artifacts.Artifact; |
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14 import de.intevation.artifacts.CallContext; |
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15 |
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16 import de.intevation.flys.artifacts.resources.Resources; |
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17 |
391
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18 |
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19 /** |
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20 * An abstract exporter that implements some basic methods for exporting data of |
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21 * artifacts. |
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22 * |
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23 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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24 */ |
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25 public abstract class AbstractExporter implements OutGenerator { |
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26 |
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27 /** The logger used in this exporter.*/ |
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28 private static Logger logger = Logger.getLogger(AbstractExporter.class); |
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29 |
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30 |
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31 /** The name of the CSV facet which triggers the CSV creation.*/ |
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32 public static final String FACET_CSV = "csv"; |
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33 |
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34 /** The default charset for the CSV export.*/ |
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35 public static final String DEFAULT_CSV_CHARSET = "UTF-8"; |
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36 |
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37 /** The default separator for the CSV export.*/ |
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38 public static final char DEFAULT_CSV_SEPARATOR = ','; |
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39 |
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40 |
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41 /** The document of the incoming out() request.*/ |
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42 protected Document request; |
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43 |
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44 /** The output stream where the data should be written to.*/ |
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45 protected OutputStream out; |
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46 |
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47 /** The CallContext object.*/ |
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48 protected CallContext context; |
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49 |
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50 /** The selected facet.*/ |
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51 protected String facet; |
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52 |
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53 /** The master artifact.*/ |
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54 protected Artifact master; |
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55 |
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56 |
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57 /** |
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58 * Concrete subclasses need to use this method to write their special data |
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59 * objects into the CSV document. |
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60 * |
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61 * @param writer The CSVWriter. |
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62 */ |
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63 protected abstract void writeCSVData(CSVWriter writer); |
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64 |
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65 |
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66 /** |
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67 * This method enables concrete subclasses to collected its own special |
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68 * data. |
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69 * |
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70 * @param artifacts The artifact that stores the data that has to be |
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71 * exported. |
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72 */ |
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73 protected abstract void addData(Artifact artifact); |
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74 |
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75 |
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76 public void init(Document request, OutputStream out, CallContext context) { |
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77 logger.debug("AbstractExporter.init"); |
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78 |
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79 this.request = request; |
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80 this.out = out; |
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81 this.context = context; |
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82 } |
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83 |
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84 |
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85 public void setMasterArtifact(Artifact master) { |
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86 this.master = master; |
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87 } |
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88 |
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89 |
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90 /** |
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91 * This doOut() just collects the data of multiple artifacts. Therefore, it |
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92 * makes use of the addData() method which enables concrete subclasses to |
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93 * store its data on its own. The real output creation takes place in the |
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94 * concrete generate() methods. |
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95 * |
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96 * @param artifact The artifact. |
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97 * @param facet The facet to add - NOTE: the facet needs to fit to the first |
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98 * facet inserted into this exporter. Otherwise this artifact/facet is |
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99 * skipped. |
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100 * @param attr The attr document. |
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101 */ |
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102 public void doOut(Artifact artifact, String facet, Document attr) { |
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103 logger.debug("AbstractExporter.doOut: " + facet); |
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104 |
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105 if (!isFacetValid(facet)) { |
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106 logger.warn("Facet '" + facet + "' not valid. No output created!"); |
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107 return; |
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108 } |
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109 |
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110 addData(artifact); |
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111 } |
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112 |
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113 |
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114 /** |
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115 * Generates an export based on a specified facet. |
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116 */ |
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117 public void generate() |
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118 throws IOException |
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119 { |
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120 logger.debug("AbstractExporter.generate"); |
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121 |
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122 if (facet != null && facet.equals(FACET_CSV)) { |
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123 generateCSV(); |
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124 } |
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125 else { |
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126 throw new IOException("invalid facet for exporter."); |
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127 } |
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128 } |
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129 |
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130 |
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131 /** |
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132 * Determines if the desired facet is valid for this exporter. If no facet |
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133 * is currently set, <i>facet</i> is set. |
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134 * |
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135 * @param facet The desired facet. |
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136 * |
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137 * @return true, if <i>facet</i> is valid, otherwise false. |
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138 */ |
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139 protected boolean isFacetValid(String facet) { |
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140 logger.debug("AbstractExporter.isFacetValid"); |
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141 |
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142 if (facet == null || facet.length() == 0) { |
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143 return false; |
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144 } |
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145 else if (this.facet == null || this.facet.length() == 0) { |
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146 logger.debug("Set the facet of this export: " + facet); |
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147 this.facet = facet; |
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148 |
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149 return true; |
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150 } |
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151 else { |
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152 return this.facet.equals(facet); |
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153 } |
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154 } |
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155 |
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156 |
416
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157 |
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158 protected String msg(String key, String def) { |
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159 return Resources.getMsg(context.getMeta(), key, def); |
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160 } |
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161 |
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162 |
391
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163 /** |
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164 * This method starts CSV creation. It makes use of writeCSVData() which has |
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165 * to be implemented by concrete subclasses. |
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166 */ |
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167 protected void generateCSV() |
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168 throws IOException |
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169 { |
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170 logger.info("AbstractExporter.generateCSV"); |
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171 |
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172 CSVWriter writer = new CSVWriter( |
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173 new OutputStreamWriter( |
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174 out, |
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175 DEFAULT_CSV_CHARSET), |
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176 DEFAULT_CSV_SEPARATOR); |
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177 |
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178 writeCSVData(writer); |
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179 |
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180 writer.close(); |
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181 } |
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182 } |
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183 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |