com.saxonica.ee.stream.feed

Class SimpleNodeConstructorFeed

java.lang.Object

com.saxonica.ee.stream.feed.ItemFeed

com.saxonica.ee.stream.feed.SimpleNodeConstructorFeed

All Implemented Interfaces:

Feed

public class SimpleNodeConstructorFeed
extends ItemFeed

This class is used when a streaming template requests evaluation of a simple content constructor in streaming mode (that is, when it constructs a text, attribute, comment, or PI node based on the contents of the streamed document).

The SimpleContentFeed is used when the node is constructed as a result of a computation on the streamed data, for example xsl:value-of select="distinct-values(.//@price)". By contrast, a SimpleContentWatch is used when the streamed nodes are selected directly, for example xsl:value-of select=".//@price".

Both a Feed and a Watch are needed because a simple content constructor operates on a sequence of nodes without simply atomizing the sequence.

Constructor Summary

Constructors

Constructor and Description
SimpleNodeConstructorFeed(Expression expr, Feed result, XPathContext context)

Method Summary

Modifier and Type	Method and Description
void	close() Finish evaluating the expression.
void	open(Terminator terminator) Start evaluating the expression.
void	processItem(Item<?> item) Supply an item to the feed

Methods inherited from class com.saxonica.ee.stream.feed.ItemFeed

dynamicError, endSelectedParentNode, getContext, getExpression, getPipelineConfiguration, getReceiver, getResult, getTerminator, hasFailed, processItems, setExpression, setHasFailed, setPipelineConfiguration, setTerminator, startSelectedParentNode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SimpleNodeConstructorFeed

public SimpleNodeConstructorFeed(Expression expr,
                                 Feed result,
                                 XPathContext context)

Method Detail

open

public void open(Terminator terminator)
          throws XPathException

Description copied from class: ItemFeed

Start evaluating the expression. The default implementation does nothing.

Specified by:

open in interface Feed

Overrides:

open in class ItemFeed

Parameters:

terminator - used to achieve early exit

Throws:

XPathException - if a dynamic error occurs

processItem

public void processItem(Item<?> item)
                 throws XPathException

Supply an item to the feed

Specified by:

processItem in interface Feed

Specified by:

processItem in class ItemFeed

Parameters:

item - the item being fed

Throws:

XPathException - to report any failure

close

public void close()
           throws XPathException

Description copied from class: ItemFeed

Finish evaluating the expression. The default implementation does nothing.

Specified by:

close in interface Feed

Overrides:

close in class ItemFeed

Throws:

XPathException - if a dynamic error occurs