Class ItemMappingFeed

All Implemented Interfaces:
Result, Receiver

public class ItemMappingFeed extends GroundedItemFeed
A Feed which applies an ItemMappingFunction to each supplied item. This produces zero or one output items for each input item. The ItemMappingFunction must be one that is capable of handling streamed nodes (otherwise an UnsupportedOperationException is likely).
  • Constructor Details

  • Method Details

    • startSelectedParentNode

      public Receiver startSelectedParentNode(FleetingParentNode node, Location locationId) throws XPathException
      Description copied from class: ItemFeed
      Signal that an element or document node has been found that matches the selection that this Watch is looking for. This method is called by the WatchManager while processing the startElement or startDocument event that matches the selection.
      Overrides:
      startSelectedParentNode in class ItemFeed
      Parameters:
      node - the element or document node whose start event has been matched
      locationId - the location associated with the element or document node (may be the location of the instruction that created it)
      Returns:
      a Receiver to be notified of all events starting with the startElement/startDocument event for the matched element, and ending with the endElement event for that element; or null if this feature is not required.
      Throws:
      XPathException - May be raised if a dynamic error occurs
    • endSelectedParentNode

      public void endSelectedParentNode(Location locationId) throws XPathException
      Description copied from class: ItemFeed
      Signal that the endElement event has occurred for the element whose startElement event caused the Watch to be activated.
      Overrides:
      endSelectedParentNode in class ItemFeed
      Parameters:
      locationId - the location of the element
      Throws:
      XPathException - May be raised if a constraint implemented by this Watch is violated
    • append

      public void append(Item item) throws XPathException
      Supply an item to the feed
      Specified by:
      append in interface Receiver
      Specified by:
      append in class ItemFeed
      Parameters:
      item - the item being fed
      Throws:
      XPathException - to report any failure
    • close

      public void close() throws XPathException
      Finish evaluating the expression. The default implementation does nothing.
      Specified by:
      close in interface Receiver
      Overrides:
      close in class ItemFeed
      Throws:
      XPathException - if a dynamic error occurs