## com.saxonica.stream.watch
Class CountWatch

    java.lang.Object
      com.saxonica.validate.AbstractWatch
          com.saxonica.stream.watch.ComposingWatch
              com.saxonica.stream.watch.CountWatch

All Implemented Interfaces:
  Watch

Direct Known Subclasses:
  EmptyWatch, ExistsWatch

    public class CountWatch

extends ComposingWatch

This class is used when a streamed template requests evaluation of the count() function applied to a streamable pattern

Field Summary
`protected long` `count`

Constructor Summary
`CountWatch(Feed result, Stack<XPathContext> contextStack)`

Method Summary
`void` `close()` The close() method is called immediately before the Watch is destroyed, that is, when the element whose declaration scopes the constraint implemented by this Watch goes out of scope.
`void` `endSelectedParentNode(int locationId)` Signal that the endElement event has occurred for the element whose startElement event caused the Watch to be activated.
`void` `notifySelectedLeafNode(FleetingNode node, int locationId)` Signal that a node (other than an element) that matches the selection has been found.
`Receiver` `startSelectedParentNode(FleetingNode node, int locationId)` Signal that an element has been found that matches the selection that this Watch is looking for.

Methods inherited from class com.saxonica.stream.watch.ComposingWatch
`getContext, getContextStack, getResult, open`

Methods inherited from class com.saxonica.validate.AbstractWatch
`getAnchorNode, getNamespaceResolver, getPipelineConfiguration, getSelection, setAnchorNode, setNamespaceResolver, setPipelineConfiguration, setSelection`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### count

    protected long count

Constructor Detail

### CountWatch

    public CountWatch(Feed result,
                      Stack<XPathContext> contextStack)

Method Detail

### startSelectedParentNode

    public Receiver startSelectedParentNode(FleetingNode node,
                                            int locationId)
                                     throws XPathException

  Signal that an element 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

  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.
  Throws:
    `ValidationException` - May be raised if the constraint implemented by this Watch is violated @param locationId
    `XPathException`

### notifySelectedLeafNode

    public void notifySelectedLeafNode(FleetingNode node,
                                       int locationId)
                                throws XPathException

  Signal that a node (other than an element) that matches the selection has been found.

  Specified by:
    `notifySelectedLeafNode` in interface `Watch`
  Overrides:
    `notifySelectedLeafNode` in class `AbstractWatch`
  Parameters:
    `node` - the node that was matched.
    `locationId` -
  Throws:
    `XPathException`

### endSelectedParentNode

    public void endSelectedParentNode(int locationId)
                               throws XPathException

  Signal that the endElement event has occurred for the element whose startElement event caused the Watch to be activated.

  Parameters:
    `locationId` - the location of the element
  Throws:
    `ValidationException` - May be raised if the constraint implemented by this Watch is violated @param locationId
    `XPathException` - May be raised if a constraint implemented by this Watch is violated

### close

    public void close()
               throws XPathException

  The close() method is called immediately before the Watch is destroyed, that is, when the element whose declaration scopes the constraint implemented by this Watch goes out of scope.

  Specified by:
    `close` in interface `Watch`
  Overrides:
    `close` in class `ComposingWatch`
  Throws:
    `XPathException`

Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.