Package net.sf.saxon.functions

Class ElementAvailable

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.ElementAvailable

All Implemented Interfaces:

Callable, FunctionItem, GroundedValue, Item, Sequence

public class ElementAvailable
extends SystemFunction

This class supports the XSLT element-available function. Note that when running in a 2.0 processor, it only looks for XSLT 2.0 instructions; but when running in a 3.0 processor, it recognizes all elements in the XSLT namespace whether or not they are classified as instructions.

Constructor Summary

Constructors

Constructor	Description
ElementAvailable()

Method Summary

Modifier and Type	Method	Description
BooleanValue	call(XPathContext context, Sequence[] arguments)	Evaluate the expression
int	getSpecialProperties(Expression[] arguments)	Special-case for element-available('xsl:evaluate') which may be dynamically-disabled, and the spec says that this should be assessed at run-time.
static boolean	isXslt30Element(int fp)
static boolean	isXslt40Element(int fp)

Methods inherited from class net.sf.saxon.functions.SystemFunction

dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getElaborator, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, makeFunctionCall, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, toShortString, toString, typeCheckCaller

Methods inherited from class net.sf.saxon.functions.AbstractFunction

atomize, deepEqual40, deepEquals, effectiveBooleanValue, getAnnotations, getUnicodeStringValue, isArray, isMap, makeNewContext, simplify, typeCheck

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.saxon.om.FunctionItem

getGenre

Methods inherited from interface net.sf.saxon.om.GroundedValue

asIterable, concatenate, containsNode, materialize

Methods inherited from interface net.sf.saxon.om.Item

getLength, getStringValue, head, isStreamed, itemAt, iterate, reduce, subsequence

Methods inherited from interface net.sf.saxon.om.Sequence

makeRepeatable

Constructor Detail

ElementAvailable

public ElementAvailable()

Method Detail

isXslt30Element

public static boolean isXslt30Element(int fp)

isXslt40Element

public static boolean isXslt40Element(int fp)

getSpecialProperties

public int getSpecialProperties(Expression[] arguments)

Special-case for element-available('xsl:evaluate') which may be dynamically-disabled, and the spec says that this should be assessed at run-time. By indicating that the effect of the function depends on the run-time environment, early evaluation at compile time is suppressed.

Overrides:

getSpecialProperties in class SystemFunction

Parameters:

arguments - the actual arguments supplied in a call to the function

Returns:

the properties

call

public BooleanValue call(XPathContext context,
                         Sequence[] arguments)
                  throws XPathException

Evaluate the expression

Parameters:

context - the dynamic evaluation context

arguments - the values of the arguments, supplied as SequenceIterators

Returns:

the result of the evaluation, in the form of a SequenceIterator

Throws:

XPathException - if a dynamic error occurs during the evaluation of the expression