Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/DataCage.java @ 950:22bc87a42a0d
First step to factor out the "Datenkorb" logic into a service independent singleton.
flys-artifacts/trunk@2367 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Wed, 20 Jul 2011 09:56:39 +0000 |
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children | 92027887775a |
rev | line source |
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First step to factor out the "Datenkorb" logic into a service independent singleton.
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1 package de.intevation.flys.artifacts.services.meta; |
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2 |
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3 import java.io.InputStream; |
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4 import java.io.IOException; |
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5 import java.io.File; |
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6 |
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7 import java.io.FileInputStream; |
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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 org.w3c.dom.Document; |
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12 |
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13 import de.intevation.artifacts.common.utils.Config; |
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14 import de.intevation.artifacts.common.utils.XMLUtils; |
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15 |
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16 public class DataCage |
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17 { |
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18 private static Logger log = Logger.getLogger(DataCage.class); |
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19 |
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20 public static final String XPATH_META_DATA_TEMPLATE = |
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21 "/artifact-database/metadata/@template"; |
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22 |
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23 private static DataCage INSTANCE; |
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24 |
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25 protected Builder builder; |
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26 |
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27 public DataCage() { |
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28 } |
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29 |
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30 public DataCage(Builder builder) { |
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31 this.builder = builder; |
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32 } |
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33 |
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34 public Builder getBuilder() { |
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35 return builder; |
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36 } |
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37 |
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38 public static synchronized DataCage getInstance() { |
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39 if (INSTANCE == null) { |
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40 INSTANCE = createDataCage(); |
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41 } |
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42 return INSTANCE; |
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43 } |
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44 |
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45 protected static Builder createBuilder(File file) { |
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46 log.debug("DataCage.createBuilder"); |
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47 |
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48 if (!file.isFile() || !file.canRead()) { |
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49 log.error("Cannot open template file '" + file + "'"); |
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50 return null; |
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51 } |
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52 |
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53 InputStream in = null; |
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54 |
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55 try { |
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56 in = new FileInputStream(file); |
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57 |
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58 Document template = XMLUtils.parseDocument(in); |
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59 |
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60 if (template == null) { |
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61 log.error("cannot parse meta data template"); |
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62 } |
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63 else { |
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64 return new Builder(template); |
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65 } |
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66 } |
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67 catch (IOException ioe) { |
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68 log.error(ioe); |
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69 } |
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70 finally { |
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71 if (in != null) { |
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72 try { |
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73 in.close(); |
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74 } |
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75 catch (IOException ioe) { |
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76 log.error(ioe); |
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77 } |
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78 } |
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79 } |
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80 return null; |
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81 } |
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82 |
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83 protected static DataCage createDataCage() { |
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84 log.debug("DataCage.createDataCage"); |
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85 |
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86 String path = Config.getStringXPath(XPATH_META_DATA_TEMPLATE); |
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87 if (path == null) { |
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88 log.error("no path to template file given"); |
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89 return null; |
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90 } |
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91 |
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92 path = Config.replaceConfigDir(path); |
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93 |
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94 return new DataCage(createBuilder(new File(path))); |
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95 } |
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96 } |
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97 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |