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annotate flys-client/src/main/java/de/intevation/flys/client/server/DataFactory.java @ 1571:1227878665b5

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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>
date Tue, 31 Jan 2012 10:34:54 +0000
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children 0f2b94408bd1
rev   line source
1571
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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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 :
http://dive4elements.wald.intevation.org