Class MotionlessFeed

All Implemented Interfaces:
Result, Receiver

public class MotionlessFeed extends ItemFeed
A feed for an expression that typically accesses the context item but does not consume the input stream. This class only ever appears as the first thing triggered by a watch. It evaluates the non-consuming expression immediately when the start event is reported, supplying the items that result from the evaluation to the next feed in the pipeline.
  • Constructor Details Link icon

  • Method Details Link icon

    • startSelectedParentNode Link icon

      public Receiver startSelectedParentNode(FleetingParentNode node, Location locationId) throws XPathException
      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
    • append Link icon

      public void append(Item item) throws XPathException
      Supply one item towards the streamed input of the expression
      Specified by:
      append in interface Receiver
      Specified by:
      append in class ItemFeed
      Parameters:
      item - the item to be supplied
      Throws:
      XPathException - if the operation fails
    • endSelectedParentNode Link icon

      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