Class ForEachGroupPartitionAction

All Implemented Interfaces:
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 Details

    • bodyContext

      protected XPathContext bodyContext
    • feedAppliesToWholeGroup

      public boolean feedAppliesToWholeGroup
  • Constructor Details

  • Method Details

    • 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
    • close

      public void close() throws XPathException
      Description copied from class: ItemFeed
      Finish evaluating the expression.
      Specified by:
      close in interface Receiver
      Overrides:
      close in class ItemFeed
      Throws:
      XPathException - if a dynamic error occurs