Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/exports/DefaultDataCollector.java @ 1052:b30361464775
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gnv-artifacts/trunk@1126 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 26 May 2010 06:45:03 +0000 |
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1 package de.intevation.gnv.exports; |
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2 |
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3 import de.intevation.gnv.geobackend.base.Result; |
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4 import de.intevation.gnv.geobackend.base.ResultDescriptor; |
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5 |
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6 import de.intevation.gnv.state.exception.StateException; |
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7 |
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8 import java.util.ArrayList; |
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9 import java.util.List; |
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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 /** |
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14 * This is the default implementation of {@link Export.DataCollector}. This |
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15 * class serves a method to extract required data from <code>Result</code> |
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16 * objects. |
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17 * |
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18 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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19 */ |
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20 public class DefaultDataCollector |
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21 implements Export.DataCollector |
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22 { |
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23 /** |
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24 * Logger used to log via log4j. |
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25 */ |
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26 private Logger log = Logger.getLogger(DefaultDataCollector.class); |
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27 |
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28 /** |
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29 * ResultDescriptor used to extract specific attributes from |
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30 * <code>Result</code> object. |
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31 */ |
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32 protected ResultDescriptor rd; |
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33 |
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34 /** |
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35 * Atrribute names in <code>Result</code> object which should be used for |
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36 * data extraction. |
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37 */ |
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38 protected String [] names; |
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39 |
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40 |
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41 /** |
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42 * Constructor |
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43 * |
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44 * @param names See {@link #names} |
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45 */ |
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46 public DefaultDataCollector(String[] names) { |
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47 this.names = names; |
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48 } |
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49 |
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50 /** |
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51 * This method initializes the <code>ResultDescriptor</code> rd for a faster |
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52 * data extraction. |
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53 * |
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54 * @param res A <code>Result</code> object used to get its description. |
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55 */ |
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56 public void init(Result res) { |
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57 rd = res.getResultDescriptor(); |
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58 } |
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59 |
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60 /** |
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61 * This method is used to extract the required data specified by {@link |
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62 * #names}. |
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63 * |
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64 * @param result <code>Result</code> object. |
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65 * |
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66 * @return Extracted data. |
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67 */ |
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68 public String[] getData(Result result) |
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69 throws StateException { |
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70 |
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71 if (rd == null) |
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72 init(result); |
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73 |
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74 List entries = new ArrayList(); |
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75 |
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76 int[] indices = rd.getColumnIndices(names); |
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77 for (int i = 0; i < names.length; ++i) { |
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78 entries.add(result.getString(indices[i])); |
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79 } |
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80 |
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81 return (String[]) entries.toArray((new String[entries.size()])); |
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82 } |
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83 } |
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84 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |