Package com.saxonica.ee.stream.feed

Class GeneralComparisonMinimaxFeed

java.lang.Object

net.sf.saxon.event.Outputter

net.sf.saxon.event.ProxyOutputter

com.saxonica.ee.stream.feed.ItemFeed

com.saxonica.ee.stream.feed.AtomicItemFeed

com.saxonica.ee.stream.feed.GeneralComparisonMinimaxFeed

All Implemented Interfaces:

javax.xml.transform.Result, Receiver

public class GeneralComparisonMinimaxFeed
extends AtomicItemFeed

This class is used when a streaming template requests a general comparison with one operand being pushed from the streamed input document, and the other being evaluated in pull mode. It is used for the operators lt, le, gt, ge.

The unstreamed operand is evaluated when the first streamed item is encountered. At this point we build a list of all the values from the unstreamed operand, unconverted, plus the min and max of all numeric values including all untyped values that are castable to numeric.

Each streamed input value is then compared against this data. If the streamed input value is numeric, or is untyped and castable to numeric, then it is compared with the min and max numeric values. Otherwise, it is compared against the complete list of unconverted values.

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
GeneralComparisonMinimaxFeed(WatchManager watchManager, Expression expr, int pushedArg, 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.
void	open(Terminator terminator)	Start evaluating the expression.

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

attribute, characters, comment, endDocument, endElement, namespace, processingInstruction, setUnparsedEntity, startContent, startDocument, startElement, startElement

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

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

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

getNextOutputter, open, usesTypeAnnotations

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

getConfiguration, getPipelineConfiguration, getStringReceiver, 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

GeneralComparisonMinimaxFeed

public GeneralComparisonMinimaxFeed(WatchManager watchManager,
                                    Expression expr,
                                    int pushedArg,
                                    ItemFeed 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.

Overrides:

open in class ItemFeed

Parameters:

terminator - used to achieve early exit

Throws:

XPathException - if a dynamic error occurs

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 (in this case, an item in the "pushed" operand sequence that is being compared

Throws:

XPathException - to report any failure

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