com.saxonica.stream.watch
Class ComposingWatch

java.lang.Object
  com.saxonica.validate.AbstractWatch
      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