com.saxonica.stream.watch
Class ComposingWatch

java.lang.Object
  extended by com.saxonica.validate.AbstractWatch
      extended by com.saxonica.stream.watch.ComposingWatch
All Implemented Interfaces:
Watch
Direct Known Subclasses:
CopyOfWatch, CountWatch, ForEachComposingWatch, SimpleContentWatch, StringValueWatch, TypedValueWatch, VoidWatch

public abstract class ComposingWatch
extends AbstractWatch

A ComposingWatch is a Watch that evaluates an expression based on the nodes encountered in a streamed input document, passing the value of that expression as a sequence of items to an ItemFeed.


Constructor Summary
ComposingWatch(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.
 XPathContext getContext()
          Get the dynamic context (the top frame of the context stack)
 Stack<XPathContext> getContextStack()
          Get the context stack
 Feed getResult()
           
 void open()
          Open the watch.
 
Methods inherited from class com.saxonica.validate.AbstractWatch
getAnchorNode, getNamespaceResolver, getPipelineConfiguration, getSelection, notifySelectedLeafNode, setAnchorNode, setNamespaceResolver, setPipelineConfiguration, setSelection
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface com.saxonica.stream.watch.Watch
endSelectedParentNode, startSelectedParentNode
 

Constructor Detail

ComposingWatch

public ComposingWatch(Feed result,
                      Stack<XPathContext> contextStack)
Method Detail

getResult

public Feed getResult()

getContext

public XPathContext getContext()
Get the dynamic context (the top frame of the context stack)

Returns:
the dynamic context

getContextStack

public Stack<XPathContext> getContextStack()
Get the context stack

Returns:
the context stack

open

public void open()
          throws XPathException
Open the watch. This is done at the point where it first starts watching for nodes that match the selection.

Specified by:
open in interface Watch
Overrides:
open in class AbstractWatch
Throws:
XPathException

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 AbstractWatch
Throws:
XPathException


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.