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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/DataCage.java @ 950:22bc87a42a0d

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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>
date Wed, 20 Jul 2011 09:56:39 +0000
parents
children 92027887775a
rev   line source
950
22bc87a42a0d 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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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 :
http://dive4elements.wald.intevation.org