ingo@1571: package de.intevation.flys.client.server;
ingo@1571: 
ingo@1571: import javax.xml.xpath.XPathConstants;
ingo@1571: 
ingo@1571: import org.w3c.dom.Element;
ingo@1571: import org.w3c.dom.NodeList;
ingo@1571: 
ingo@1571: import org.apache.log4j.Logger;
ingo@1571: 
ingo@1571: import de.intevation.artifacts.common.ArtifactNamespaceContext;
ingo@1571: import de.intevation.artifacts.common.utils.XMLUtils;
ingo@1571: 
ingo@1571: import de.intevation.flys.client.shared.model.Data;
ingo@1571: import de.intevation.flys.client.shared.model.DataItem;
ingo@1571: import de.intevation.flys.client.shared.model.DefaultData;
ingo@1571: import de.intevation.flys.client.shared.model.DefaultDataItem;
ingo@1571: 
ingo@1571: 
ingo@1571: /**
ingo@1571:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@1571:  */
ingo@1571: public class DataFactory {
ingo@1571: 
ingo@1571:     private static final Logger logger = Logger.getLogger(DataFactory.class);
ingo@1571: 
ingo@1571: 
ingo@1571:     public static final String NS_URI = ArtifactNamespaceContext.NAMESPACE_URI;
ingo@1571: 
ingo@1571: 
ingo@1571:     /**
ingo@1571:      * Creates a new Data instance based on the <i>art:type</i> attribute of
ingo@1571:      * <i>element</i>.
ingo@1571:      *
ingo@1571:      * @param element The Data element.
ingo@1571:      *
ingo@1571:      * @return a Data instance.
ingo@1571:      */
ingo@1571:     public static Data createDataFromElement(Element element) {
ingo@1571:         String name = element.getAttributeNS(NS_URI, "name");
ingo@1571:         String type = element.getAttributeNS(NS_URI, "type");
ingo@1571: 
ingo@1571:         logger.debug("Create new Data instance for: " + name + " | " + type);
ingo@1571: 
ingo@1571:         if (type == null || type.length() == 0) {
ingo@1571:             return createDefaultData(element, name);
ingo@1571:         }
ingo@1571:         else {
ingo@1571:             return createDefaultData(element, name);
ingo@1571:         }
ingo@1571:     }
ingo@1571: 
ingo@1571: 
ingo@1571:     /**
ingo@1571:      * This method creates a new instance of DefaultData which has no real type
ingo@1571:      * set.
ingo@1571:      *
ingo@1571:      * @param ele The Data element.
ingo@1571:      * @param name The name of the Data instance.
ingo@1571:      *
ingo@1571:      * @return an instance of DefaultData.
ingo@1571:      */
ingo@1571:     protected static Data createDefaultData(Element ele, String name) {
ingo@1571:         logger.debug("Create new DefaultData");
ingo@1571:         return new DefaultData(name, name, "default", extractDataItems(ele));
ingo@1571:     }
ingo@1571: 
ingo@1571: 
ingo@1571:     /**
ingo@1571:      * This method extracts the art:item elements placed under <i>elements</i>.
ingo@1571:      *
ingo@1571:      * @param element A data node that contains items.
ingo@1571:      *
ingo@1571:      * @return a list of DataItems.
ingo@1571:      */
ingo@1571:     protected static DataItem[] extractDataItems(Element element) {
ingo@1571:         NodeList itemList = (NodeList) XMLUtils.xpath(
ingo@1571:             element,
ingo@1571:             "art:item",
ingo@1571:             XPathConstants.NODESET,
ingo@1571:             ArtifactNamespaceContext.INSTANCE);
ingo@1571: 
ingo@1571:         if (itemList == null || itemList.getLength() == 0) {
ingo@1571:             logger.debug("No old data items found.");
ingo@1571:             return null;
ingo@1571:         }
ingo@1571: 
ingo@1571:         int count = itemList.getLength();
ingo@1571: 
ingo@1571:         DataItem[] items = new DataItem[count];
ingo@1571: 
ingo@1571:         for (int i = 0; i < count; i++) {
ingo@1571:             Element tmp = (Element) itemList.item(i);
ingo@1571: 
ingo@1571:             String value = tmp.getAttributeNS(NS_URI, "value");
ingo@1571:             String label = tmp.getAttributeNS(NS_URI, "label");
ingo@1571: 
ingo@1571:             items[i] = new DefaultDataItem(label, label, value);
ingo@1571:         }
ingo@1571: 
ingo@1571:         return items;
ingo@1571:     }
ingo@1571: }
ingo@1571: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :