Class ForEachGroupPartitionAction

  • All Implemented Interfaces:
    javax.xml.transform.Result, Receiver

    public class ForEachGroupPartitionAction
    extends ItemFeed
    This watch implements xsl:for-each-group in streaming mode, in cases where the population is being partitioned (that is, group-adjacent, group-starting-with, and group-ending-with), and where the population is not grounded. It is informed of the nodes or other items selected by the xsl:for-each instruction; when such an item is encountered, it locates the relevant (inverted) action representing the body of the for-each, and activates it.

    The feed is capable of handling a select expression that selects non-peer nodes (that is, one selected node that is a descendant of another). A top-level selected node is processed directly to the output receiver; a nested node is processed to create a temporary result tree, which is then appended to the output sequence when the processing of the outer selected node is complete.

    • Field Detail

      • feedAppliesToWholeGroup

        public boolean feedAppliesToWholeGroup
    • Method Detail

      • setInversion

        public void setInversion​(Inversion inversion)
      • getInversion

        protected Inversion getInversion()
      • open

        public void open​(Terminator terminator)
                  throws XPathException
        Description copied from class: ItemFeed
        Start evaluating the expression. The default implementation does nothing.
        Overrides:
        open in class ItemFeed
        Parameters:
        terminator - used to achieve early exit
        Throws:
        XPathException - if a dynamic error occurs
      • makeBodyContext

        protected void makeBodyContext()
      • startSelectedParentNode

        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 event that matches the selection. For this purpose, any attributes selected by the last step in the selection are ignored
        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 that collects the contents of the selected node, or null
        Throws:
        XPathException - if a dynamic error occurs while processing the start-element event
      • append

        public void append​(Item node)
                    throws XPathException
        Signal that an item (other than an element) that matches the selection has been found.
        Specified by:
        append in interface Receiver
        Specified by:
        append in class ItemFeed
        Parameters:
        node - the item that was matched.
        Throws:
        XPathException - if the operation fails
      • endSelectedParentNode

        public void endSelectedParentNode​(Location locationId)
                                   throws XPathException
        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 node in the source, or of the instruction that created it
        Throws:
        ValidationException - May be raised if the constraint implemented by this Watch is violated @param locationId the location of the node in the source, or of the instruction that created it
        XPathException - May be raised if a constraint implemented by this Watch is violated