Package net.sf.saxon.functions
Class AccessorFn
java.lang.Object
net.sf.saxon.functions.AbstractFunction
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.ScalarSystemFunction
net.sf.saxon.functions.AccessorFn
- All Implemented Interfaces:
Callable
,FunctionItem
,GroundedValue
,Item
,Sequence
- Direct Known Subclasses:
AccessorFn.DayFromDate
,AccessorFn.DayFromDateTime
,AccessorFn.DaysFromDuration
,AccessorFn.HoursFromDateTime
,AccessorFn.HoursFromDuration
,AccessorFn.HoursFromTime
,AccessorFn.LocalNameFromQName
,AccessorFn.MinutesFromDateTime
,AccessorFn.MinutesFromDuration
,AccessorFn.MinutesFromTime
,AccessorFn.MonthFromDate
,AccessorFn.MonthFromDateTime
,AccessorFn.MonthsFromDuration
,AccessorFn.NamespaceUriFromQName
,AccessorFn.PrefixFromQName
,AccessorFn.SecondsFromDateTime
,AccessorFn.SecondsFromDuration
,AccessorFn.SecondsFromTime
,AccessorFn.TimezoneFromDate
,AccessorFn.TimezoneFromDateTime
,AccessorFn.TimezoneFromTime
,AccessorFn.YearFromDate
,AccessorFn.YearFromDateTime
,AccessorFn.YearsFromDuration
This class supports the get_X_from_Y functions defined in XPath 2.0
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic class
Elaborator for accessor functions such as hours-from-date-Time, minutes-from-durationstatic enum
static class
static class
static class
static class
static class
static class
static class
static class
static class
static class
static class
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static class
static class
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static class
static class
static class
static class
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionevaluate
(Item item, XPathContext context) Evaluate the expressionabstract AccessorFn.Component
Make an elaborator for this expressionFor an expression that returns an integer or a sequence of integers, get a lower and upper bound on the values of the integers that may be returned, from static analysis.Methods inherited from class net.sf.saxon.functions.ScalarSystemFunction
call, makeFunctionCall, resultWhenEmpty
Methods inherited from class net.sf.saxon.functions.SystemFunction
dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, 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
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Constructor Details
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AccessorFn
public AccessorFn()
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Method Details
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getComponentId
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getIntegerBounds
For an expression that returns an integer or a sequence of integers, get a lower and upper bound on the values of the integers that may be returned, from static analysis. The default implementation returns null, meaning "unknown" or "not applicable". Other implementations return an array of two IntegerValue objects, representing the lower and upper bounds respectively. The values UNBOUNDED_LOWER and UNBOUNDED_UPPER are used by convention to indicate that the value may be arbitrarily large. The values MAX_STRING_LENGTH and MAX_SEQUENCE_LENGTH are used to indicate values limited by the size of a string or the size of a sequence.- Overrides:
getIntegerBounds
in classSystemFunction
- Returns:
- the lower and upper bounds of integer values in the result, or null to indicate unknown or not applicable.
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evaluate
Evaluate the expression- Specified by:
evaluate
in classScalarSystemFunction
- Parameters:
item
- the supplied argumentcontext
- the dynamic context- Returns:
- the result of the evaluation
- Throws:
XPathException
- if a dynamic error occurs
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getElaborator
Make an elaborator for this expression- Overrides:
getElaborator
in classSystemFunction
- Returns:
- a suitable elaborator
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