Package net.sf.saxon.type

Interface FunctionItemType

All Superinterfaces:

ItemType

All Known Subinterfaces:

TupleType

All Known Implementing Classes:

AnyFunctionType, AnyFunctionTypeWithAssertions, ArrayItemType, MapType, RecordTest, SelfReferenceRecordTest, SpecificFunctionType

public interface FunctionItemType
extends ItemType

Higher-order functions in XPath 3.0 introduce a third kind of Item, namely a Function Item. This type is represented here by a placeholder interfaces. The implementation of this type is found only in Saxon-EE

Method Summary

Modifier and Type	Method	Description
AnnotationList	getAnnotationAssertions()	Get the list of Annotation Assertions associated with this function item type
SequenceType[]	getArgumentTypes()	Get the argument types of the function
default Genre	getGenre()	Determine the Genre (top-level classification) of this type
SequenceType	getResultType()	Get the result type of the function
boolean	isArrayType()	Ask whether this function item type is an array type.
boolean	isMapType()	Ask whether this function item type is a map type.
Expression	makeFunctionSequenceCoercer(Expression exp, RoleDiagnostic role)	Create an expression whose effect is to apply function coercion to coerce a function to this function type
Affinity	relationship(FunctionItemType other, TypeHierarchy th)	Determine the relationship of one function item type to another.

Methods inherited from interface net.sf.saxon.type.ItemType

explainMismatch, getAtomizedItemType, getBasicAlphaCode, getDefaultPriority, getFullAlphaCode, getNormalizedDefaultPriority, getPrimitiveItemType, getPrimitiveType, getUType, isAtomicType, isAtomizable, isPlainType, matches, toExportString

Method Detail

getGenre

default Genre getGenre()

Determine the Genre (top-level classification) of this type

Specified by:

getGenre in interface ItemType

Returns:

the Genre to which this type belongs, specifically Genre.FUNCTION

getArgumentTypes

SequenceType[] getArgumentTypes()

Get the argument types of the function

Returns:

the argument types, as an array of SequenceTypes; or null if this is the generic function type function(*)

getResultType

SequenceType getResultType()

Get the result type of the function

Returns:

the result type, as a SequenceType

relationship

Affinity relationship(FunctionItemType other,
                      TypeHierarchy th)

Determine the relationship of one function item type to another. This method is only concerned with the type signatures of the two function item types, and not with their annotation assertions.

Parameters:

other - the other function item type

th - the type hierarchy cache

Returns:

for example Affinity.SUBSUMES, Affinity.SAME_TYPE

getAnnotationAssertions

AnnotationList getAnnotationAssertions()

Get the list of Annotation Assertions associated with this function item type

Returns:

the list of annotation assertions

makeFunctionSequenceCoercer

Expression makeFunctionSequenceCoercer(Expression exp,
                                       RoleDiagnostic role)
                                throws XPathException

Create an expression whose effect is to apply function coercion to coerce a function to this function type

Parameters:

exp - the expression that delivers the supplied sequence of function items (the ones in need of coercion)

role - information for use in diagnostics

Returns:

the coerced function, a function that calls the original function after checking the parameters

Throws:

XPathException - if an error is detected

isMapType

boolean isMapType()

Ask whether this function item type is a map type. In this case function coercion (to the map type) will never succeed.

Returns:

true if this FunctionItemType is a map type

isArrayType

boolean isArrayType()

Ask whether this function item type is an array type. In this case function coercion (to the array type) will never succeed.

Returns:

true if this FunctionItemType is an array type