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,Function,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 enumstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic classstatic class -
Field Summary
Fields inherited from class net.sf.saxon.functions.ScalarSystemFunction
ZERO_LENGTH_STRING -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionevaluate(Item item, XPathContext context) Evaluate the expressionGet the (local) name of a class that can be used to generate bytecode for this system functionabstract AccessorFn.ComponentFor 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.intGet the required componentMethods inherited from class net.sf.saxon.functions.ScalarSystemFunction
call, makeFunctionCall, resultWhenEmptyMethods 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, importAttributes, isTrustedResultType, makeCall, makeFunction, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, toShortString, toString, typeCheckCallerMethods inherited from class net.sf.saxon.functions.AbstractFunction
atomize, deepEquals, effectiveBooleanValue, getAnnotations, getStringValue, getStringValueCS, isArray, isMap, makeNewContext, simplify, typeCheckMethods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitMethods inherited from interface net.sf.saxon.om.GroundedValue
asIterable, concatenate, containsNode, materializeMethods inherited from interface net.sf.saxon.om.Item
getLength, head, isStreamed, itemAt, iterate, reduce, subsequenceMethods 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:
getIntegerBoundsin 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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getRequiredComponent
public int getRequiredComponent()Get the required component- Returns:
- the integer code identifying of the required component
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evaluate
Evaluate the expression- Specified by:
evaluatein 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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getCompilerName
Description copied from class:SystemFunctionGet the (local) name of a class that can be used to generate bytecode for this system function- Overrides:
getCompilerNamein classSystemFunction- Returns:
- the name of a bytecode generation class, or null if there is no bytecode support for this function
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