Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/exports/DefaultExport.java @ 771:a0e63136954e
Added and repaired javadoc in de.intevation.gnv.exports package.
gnv-artifacts/trunk@827 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 25 Mar 2010 09:01:14 +0000 |
parents | f28a7eac542a |
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1 package de.intevation.gnv.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 import java.io.UnsupportedEncodingException; |
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7 import java.util.Collection; |
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8 import java.util.Iterator; |
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9 |
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10 import org.apache.log4j.Logger; |
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11 |
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12 import au.com.bytecode.opencsv.CSVWriter; |
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13 import de.intevation.gnv.geobackend.base.Result; |
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14 import de.intevation.gnv.state.exception.StateException; |
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15 |
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16 /** |
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17 * This class is the default implementation of {@link Export}. |
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18 * |
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19 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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20 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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21 */ |
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22 public class DefaultExport |
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23 implements Export |
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24 { |
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25 /** |
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26 * Logger used for logging via log4j. |
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27 */ |
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28 private static Logger log = Logger.getLogger(DefaultExport.class); |
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29 |
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30 /** |
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31 * DataCollector used to extract data from <code>Result</code> objects. |
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32 */ |
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33 protected Export.DataCollector collector; |
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34 |
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35 /** |
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36 * Constructor |
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37 * |
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38 * @param collector See {@link #collector} |
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39 */ |
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40 public DefaultExport(Export.DataCollector collector) { |
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41 this.collector = collector; |
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42 } |
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43 |
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44 /** |
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45 * This method writes data stored in <code>result</code> into a CSV document |
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46 * using <code>writer</code>. |
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47 * |
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48 * @param profile {@link #Profile} used to specify the format and columns. |
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49 * @param result Collection storing the required data. |
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50 * @param writer CSVWriter to write the csv document. |
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51 * |
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52 * @throws StateException |
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53 */ |
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54 protected void writeData( |
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55 Profile profile, |
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56 Collection result, |
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57 CSVWriter writer |
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58 ) |
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59 throws StateException { |
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60 log.debug("create content for export."); |
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61 Iterator<Result> it = result.iterator(); |
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62 |
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63 String[] header = profile.getHeader(); |
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64 if (header != null) |
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65 writer.writeNext(header); |
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66 |
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67 while (it.hasNext()) { |
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68 Result res = it.next(); |
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69 |
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70 writer.writeNext(collector.getData(res)); |
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71 } |
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72 } |
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73 |
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74 /** |
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75 * This method takes a data Collection and writes it to |
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76 * <code>outputStream</code> using the the format specified by |
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77 * <code>profile</code>. |
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78 * |
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79 * @param profile used to specify the format and columns. |
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80 * @param outputStream OutputStream which is used for writing the export |
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81 * document to. |
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82 * @param result Collection storing the data. |
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83 * |
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84 * @throws IOException if writing to OutputStream failed. |
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85 * @throws UnsupportedEncodingException if the encoding was not accepted. |
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86 * @throws StateException if result is null. |
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87 */ |
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88 public void create( |
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89 Profile profile, |
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90 OutputStream outputStream, |
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91 Collection result |
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92 ) |
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93 throws |
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94 IOException, |
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95 UnsupportedEncodingException, |
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96 StateException |
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97 { |
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98 if (result == null) { |
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99 String msg = "No data given for generation of " + |
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100 profile.getType() + " file."; |
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101 log.error(msg); |
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102 throw new StateException(msg); |
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103 } |
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104 |
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105 CSVWriter writer = new CSVWriter( |
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106 new OutputStreamWriter( |
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107 outputStream, |
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108 profile.getEncoding()), |
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109 profile.getSeparator(), |
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110 profile.getQuoteCharacter(), |
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111 profile.getEscapeCharacter()); |
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112 |
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113 writeData(profile, result, writer); |
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114 |
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115 writer.close(); |
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116 } |
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117 } |
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118 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |