Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/DataFactory.java @ 1571:1227878665b5
Introduced a DataFactory that should be used to create new Data instances.
flys-client/trunk@3836 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 31 Jan 2012 10:34:54 +0000 |
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children | 0f2b94408bd1 |
rev | line source |
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1227878665b5
Introduced a DataFactory that should be used to create new Data instances.
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1 package de.intevation.flys.client.server; |
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Introduced a DataFactory that should be used to create new Data instances.
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2 |
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3 import javax.xml.xpath.XPathConstants; |
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4 |
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5 import org.w3c.dom.Element; |
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6 import org.w3c.dom.NodeList; |
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7 |
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8 import org.apache.log4j.Logger; |
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9 |
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10 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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11 import de.intevation.artifacts.common.utils.XMLUtils; |
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12 |
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13 import de.intevation.flys.client.shared.model.Data; |
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14 import de.intevation.flys.client.shared.model.DataItem; |
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15 import de.intevation.flys.client.shared.model.DefaultData; |
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16 import de.intevation.flys.client.shared.model.DefaultDataItem; |
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17 |
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18 |
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19 /** |
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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 DataFactory { |
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23 |
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24 private static final Logger logger = Logger.getLogger(DataFactory.class); |
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25 |
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26 |
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27 public static final String NS_URI = ArtifactNamespaceContext.NAMESPACE_URI; |
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28 |
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29 |
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30 /** |
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31 * Creates a new Data instance based on the <i>art:type</i> attribute of |
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32 * <i>element</i>. |
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33 * |
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34 * @param element The Data element. |
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35 * |
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36 * @return a Data instance. |
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37 */ |
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38 public static Data createDataFromElement(Element element) { |
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39 String name = element.getAttributeNS(NS_URI, "name"); |
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40 String type = element.getAttributeNS(NS_URI, "type"); |
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41 |
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42 logger.debug("Create new Data instance for: " + name + " | " + type); |
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43 |
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44 if (type == null || type.length() == 0) { |
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45 return createDefaultData(element, name); |
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46 } |
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47 else { |
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48 return createDefaultData(element, name); |
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49 } |
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50 } |
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51 |
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52 |
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53 /** |
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54 * This method creates a new instance of DefaultData which has no real type |
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55 * set. |
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56 * |
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57 * @param ele The Data element. |
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58 * @param name The name of the Data instance. |
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59 * |
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60 * @return an instance of DefaultData. |
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61 */ |
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62 protected static Data createDefaultData(Element ele, String name) { |
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63 logger.debug("Create new DefaultData"); |
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64 return new DefaultData(name, name, "default", extractDataItems(ele)); |
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65 } |
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66 |
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67 |
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68 /** |
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69 * This method extracts the art:item elements placed under <i>elements</i>. |
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70 * |
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71 * @param element A data node that contains items. |
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72 * |
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73 * @return a list of DataItems. |
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74 */ |
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75 protected static DataItem[] extractDataItems(Element element) { |
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76 NodeList itemList = (NodeList) XMLUtils.xpath( |
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77 element, |
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78 "art:item", |
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79 XPathConstants.NODESET, |
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80 ArtifactNamespaceContext.INSTANCE); |
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81 |
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82 if (itemList == null || itemList.getLength() == 0) { |
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83 logger.debug("No old data items found."); |
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84 return null; |
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85 } |
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86 |
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87 int count = itemList.getLength(); |
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88 |
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89 DataItem[] items = new DataItem[count]; |
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90 |
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91 for (int i = 0; i < count; i++) { |
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92 Element tmp = (Element) itemList.item(i); |
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93 |
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94 String value = tmp.getAttributeNS(NS_URI, "value"); |
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95 String label = tmp.getAttributeNS(NS_URI, "label"); |
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96 |
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97 items[i] = new DefaultDataItem(label, label, value); |
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98 } |
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99 |
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100 return items; |
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101 } |
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102 } |
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103 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |