Package com.saxonica.ee.stream.feed

Class SimpleNodeConstructorFeed

java.lang.Object

net.sf.saxon.event.Outputter

net.sf.saxon.event.ProxyOutputter

com.saxonica.ee.stream.feed.ItemFeed

com.saxonica.ee.stream.feed.SimpleNodeConstructorFeed

All Implemented Interfaces:

javax.xml.transform.Result, Receiver

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.

Field Summary

Fields inherited from class net.sf.saxon.event.Outputter

pipelineConfiguration, systemId

Fields inherited from interface javax.xml.transform.Result

PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING

Constructor Summary

Constructors

Constructor	Description
SimpleNodeConstructorFeed(Expression expr, ItemFeed result, XPathContext context)

Method Summary

Modifier and Type	Method	Description
void	append(Item item)	Supply an item to the feed
void	close()	Finish evaluating the expression.
CharSequenceConsumer	getStringReceiver(boolean asTextNode, Location loc)	Get a string-value consumer object that allows an item of type xs:string to be appended one fragment at a time.

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

append, dynamicError, endSelectedParentNode, getContext, getExpression, getResult, getTerminator, hasFailed, open, processItems, setExpression, setHasFailed, setTerminator, startSelectedParentNode

Methods inherited from class net.sf.saxon.event.ProxyOutputter

attribute, characters, comment, endDocument, endElement, getNextOutputter, namespace, open, processingInstruction, setLocation, setUnparsedEntity, startContent, startDocument, startElement, startElement, usesTypeAnnotations

Methods inherited from class net.sf.saxon.event.Outputter

getConfiguration, getPipelineConfiguration, getSystemId, namespaces, setPipelineConfiguration, setSystemId

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.event.Receiver

handlesAppend

Constructor Detail

SimpleNodeConstructorFeed

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

Method Detail

append

public void append(Item item)
            throws XPathException

Supply an item to the feed

Specified by:

append in interface Receiver

Specified by:

append in class ItemFeed

Parameters:

item - the item being fed

Throws:

XPathException - to report any failure

getStringReceiver

public CharSequenceConsumer getStringReceiver(boolean asTextNode,
                                              Location loc)

Description copied from class: Outputter

Get a string-value consumer object that allows an item of type xs:string to be appended one fragment at a time. This potentially allows operations that output large strings to avoid building the entire string in memory. The default implementation, however, simply assembles the string in a buffer and releases the entire string on completion.

Overrides:

getStringReceiver in class Outputter

Parameters:

asTextNode - set to true if the concatenated string values are to be treated as a text node

loc - the location of the instruction generating the content

Returns:

an object that accepts xs:string values via a sequence of append() calls

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