Package net.sf.saxon.functions

Class DynamicContextAccessor

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.DynamicContextAccessor

All Implemented Interfaces:

Callable, ArityZeroFunction, IFunctionWithRetainedParameterNames, FunctionItem, GroundedValue, Item, Sequence

Direct Known Subclasses:

DynamicContextAccessor.CurrentDate, DynamicContextAccessor.CurrentDateTime, DynamicContextAccessor.CurrentTime, DynamicContextAccessor.DefaultLanguage, DynamicContextAccessor.ImplicitTimezone

public abstract class DynamicContextAccessor
extends SystemFunction
implements ArityZeroFunction

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DynamicContextAccessor.CurrentDate
static class	DynamicContextAccessor.CurrentDateTime
static class	DynamicContextAccessor.CurrentTime
static class	DynamicContextAccessor.DefaultLanguage
static class	DynamicContextAccessor.ImplicitTimezone

Constructor Summary

Constructors

Constructor	Description
DynamicContextAccessor()

Method Summary

Modifier and Type	Method	Description
void	bindContext(XPathContext context)
AtomicValue	call(XPathContext context, Sequence[] arguments)	Evaluate the expression
AtomicValue	call0(XPathContext context)	Call a function with no arguments
abstract AtomicValue	evaluate(XPathContext context)
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, getContextNode, getDescription, getDetails, getElaborator, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getNetCost, getOperandRoles, getParameterNames, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, getUniqueIdentifier, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, makeOptimizedFunctionCall, makeTrueFunctionCall, 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

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

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

makeRepeatable

Constructor Details

DynamicContextAccessor

public DynamicContextAccessor()

Method Details

bindContext

public void bindContext(XPathContext context)
                 throws XPathException

Throws:

XPathException

evaluate

public abstract AtomicValue evaluate(XPathContext context)
                              throws XPathException

Throws:

XPathException

call0

public AtomicValue call0(XPathContext context)
                  throws XPathException

Call a function with no arguments

Specified by:

call0 in interface ArityZeroFunction

Parameters:

context - the dynamic evaluation context

Returns:

the result of the function call

Throws:

XPathException - if the call fails with a dynamic error

call

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

Evaluate the expression

Specified by:

call in interface Callable

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