net.sf.saxon.functions

Class StaticContextAccessor

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.StaticContextAccessor

All Implemented Interfaces:

Callable, Function, GroundedValue, Item, Sequence

Direct Known Subclasses:

StaticContextAccessor.DefaultCollation, StaticContextAccessor.StaticBaseUri

public abstract class StaticContextAccessor
extends SystemFunction

A StaticContextAccessor is a function that takes no arguments, but operates implicitly on the static context. In the case of a dynamic call, the context that is used is the one at the point where the function item is created.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StaticContextAccessor.DefaultCollation Implement the XPath function default-collation()
static class	StaticContextAccessor.StaticBaseUri Implement the XPath function static-base-uri()

Constructor Summary

Constructors

Constructor and Description
StaticContextAccessor()

Method Summary

Modifier and Type	Method and Description
AtomicValue	call(XPathContext context, Sequence[] arguments) Evaluate the expression
abstract AtomicValue	evaluate(RetainedStaticContext rsc) Method to do the actual evaluation, which must be implemented in a subclass
Expression	makeFunctionCall(Expression[] arguments) Make an expression that either calls this function, or that is equivalent to a call on this function

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

dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getCompilerName, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, importAttributes, isTrustedResultType, makeCall, makeFunction, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, typeCheckCaller

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

atomize, deepEquals, effectiveBooleanValue, getAnnotations, getStringValue, getStringValueCS, isArray, isMap, makeNewContext, simplify, typeCheck

Methods inherited from class net.sf.saxon.om.AbstractItem

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

Methods inherited from class java.lang.Object

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

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

iterate

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

head

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

getLength, head, itemAt, reduce, subsequence

Constructor Detail

StaticContextAccessor

public StaticContextAccessor()

Method Detail

evaluate

public abstract AtomicValue evaluate(RetainedStaticContext rsc)

Method to do the actual evaluation, which must be implemented in a subclass

Parameters:

rsc - the retained static context

Returns:

the result of the evaluation

call

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

Evaluate the expression

Parameters:

context - the dynamic evaluation context

arguments - the values of the arguments, supplied as Sequences

Returns:

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

Throws:

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

makeFunctionCall

public Expression makeFunctionCall(Expression[] arguments)

Description copied from class: SystemFunction

Make an expression that either calls this function, or that is equivalent to a call on this function

Overrides:

makeFunctionCall in class SystemFunction

Parameters:

arguments - the supplied arguments to the function call

Returns:

either a function call on this function, or an expression that delivers the same result