net.sf.saxon.ma.map

Class TupleItemType

java.lang.Object

net.sf.saxon.type.AnyFunctionType

net.sf.saxon.ma.map.TupleItemType

All Implemented Interfaces:

TupleType, FunctionItemType, ItemType

public class TupleItemType
extends AnyFunctionType
implements TupleType

An instance of this class represents a specific tuple item type, for example tuple(x as xs:double, y as element(employee)). Tuple types are a Saxon extension introduced in Saxon 9.8. The syntax for constructing a tuple type requires Saxon-PE or higher, but the supporting code is included in Saxon-HE for convenience. Extended in 10.0 to distinguish extensible vs non-extensible tuple types. Extensible tuple types permit fields other than those listed to appear; non-extensible tuple types do not. An extensible tuple type is denoted by tuple(... ,*).

Nested Class Summary

Nested classes/interfaces inherited from interface net.sf.saxon.type.ItemType

ItemType.WithSequenceTypeCache

Field Summary

Fields inherited from class net.sf.saxon.type.AnyFunctionType

ANY_FUNCTION

Constructor Summary

Constructors

Constructor and Description
TupleItemType(java.util.List<java.lang.String> names, java.util.List<SequenceType> types, boolean extensible)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other) Test whether this function type equals another function type
java.util.Optional<java.lang.String>	explainMismatch(Item item, TypeHierarchy th) Get extra diagnostic information about why a supplied item does not conform to this item type, if available.
SequenceType[]	getArgumentTypes() Get the argument types of this map, viewed as a function
int	getArity() Get the arity (number of arguments) of this function type
java.lang.String	getBasicAlphaCode() Get an alphabetic code representing the type, or at any rate, the nearest built-in type from which this type is derived.
double	getDefaultPriority() Get the default priority when this ItemType is used as an XSLT pattern
java.lang.Iterable<java.lang.String>	getFieldNames() Get the names of all the fields
SequenceType	getFieldType(java.lang.String field) Get the type of a given field
Genre	getGenre() Determine the Genre (top-level classification) of this type
SequenceType	getResultType() Get the result type of this tuple type, viewed as a function
int	hashCode() Returns a hash code value for the object.
boolean	isArrayType() Ask whether this function item type is an array type.
boolean	isExtensible() Ask whether the tuple type is extensible, that is, whether fields other than those named are permitted
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 from this type to another type
boolean	matches(Item item, TypeHierarchy th) Test whether a given item conforms to this type
Affinity	relationship(FunctionItemType other, TypeHierarchy th) Determine the relationship of one function item type to another
java.lang.String	toExportString() Return a string representation of this ItemType suitable for use in stylesheet export files.
java.lang.String	toString() Produce a representation of this type name for use in error messages.

Methods inherited from class net.sf.saxon.type.AnyFunctionType

getAnnotationAssertions, getAtomizedItemType, getInstance, getPrimitiveItemType, getPrimitiveType, getUType, isAtomicType, isAtomizable, isPlainType

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

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

getAnnotationAssertions

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

getAtomizedItemType, getFullAlphaCode, getNormalizedDefaultPriority, getPrimitiveItemType, getPrimitiveType, getUType, isAtomicType, isAtomizable, isPlainType, isTrueItemType

Constructor Detail

TupleItemType

public TupleItemType(java.util.List<java.lang.String> names,
                     java.util.List<SequenceType> types,
                     boolean extensible)

Method Detail

getGenre

public Genre getGenre()

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

Specified by:

getGenre in interface FunctionItemType

Specified by:

getGenre in interface ItemType

Returns:

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

isMapType

public boolean isMapType()

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

Specified by:

isMapType in interface FunctionItemType

Overrides:

isMapType in class AnyFunctionType

Returns:

true if this FunctionItemType is a map type

isArrayType

public boolean isArrayType()

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

Specified by:

isArrayType in interface FunctionItemType

Overrides:

isArrayType in class AnyFunctionType

Returns:

true if this FunctionItemType is an array type

getFieldNames

public java.lang.Iterable<java.lang.String> getFieldNames()

Get the names of all the fields

Specified by:

getFieldNames in interface TupleType

Returns:

the names of the fields (in arbitrary order)

getFieldType

public SequenceType getFieldType(java.lang.String field)

Get the type of a given field

Specified by:

getFieldType in interface TupleType

Parameters:

field - the name of the field

Returns:

the type of the field if it is defined, or null otherwise

isExtensible

public boolean isExtensible()

Ask whether the tuple type is extensible, that is, whether fields other than those named are permitted

Specified by:

isExtensible in interface TupleType

Returns:

true if fields other than the named fields are permitted to appear

matches

public boolean matches(Item item,
                       TypeHierarchy th)
                throws XPathException

Test whether a given item conforms to this type

Specified by:

matches in interface ItemType

Overrides:

matches in class AnyFunctionType

Parameters:

item - The item to be tested

th - type hierarchy data

Returns:

true if the item is an instance of this type; false otherwise

Throws:

XPathException

getArity

public int getArity()

Get the arity (number of arguments) of this function type

Returns:

the number of argument types in the function signature

getArgumentTypes

public SequenceType[] getArgumentTypes()

Get the argument types of this map, viewed as a function

Specified by:

getArgumentTypes in interface FunctionItemType

Overrides:

getArgumentTypes in class AnyFunctionType

Returns:

the list of argument types of this map, viewed as a function

getResultType

public SequenceType getResultType()

Get the result type of this tuple type, viewed as a function

Specified by:

getResultType in interface FunctionItemType

Overrides:

getResultType in class AnyFunctionType

Returns:

the result type of this tuple type, viewed as a function

getDefaultPriority

public double getDefaultPriority()

Get the default priority when this ItemType is used as an XSLT pattern

Specified by:

getDefaultPriority in interface ItemType

Overrides:

getDefaultPriority in class AnyFunctionType

Returns:

the default priority

toString

public java.lang.String toString()

Produce a representation of this type name for use in error messages.

Specified by:

toString in interface ItemType

Overrides:

toString in class AnyFunctionType

Returns:

a string representation of the type, in notation resembling but not necessarily identical to XPath syntax

toExportString

public java.lang.String toExportString()

Return a string representation of this ItemType suitable for use in stylesheet export files. This differs from the result of toString() in that it will not contain any references to anonymous types. Note that it may also use the Saxon extended syntax for union types and tuple types.

Specified by:

toExportString in interface ItemType

Returns:

the string representation as an instance of the XPath ItemType construct

getBasicAlphaCode

public java.lang.String getBasicAlphaCode()

Get an alphabetic code representing the type, or at any rate, the nearest built-in type from which this type is derived. The codes are designed so that for any two built-in types A and B, alphaCode(A) is a prefix of alphaCode(B) if and only if A is a supertype of B.

Specified by:

getBasicAlphaCode in interface ItemType

Overrides:

getBasicAlphaCode in class AnyFunctionType

Returns:

the alphacode for the nearest containing built-in type

equals

public boolean equals(java.lang.Object other)

Test whether this function type equals another function type

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Returns a hash code value for the object.

Overrides:

hashCode in class java.lang.Object

relationship

public Affinity relationship(FunctionItemType other,
                             TypeHierarchy th)

Determine the relationship of one function item type to another

Specified by:

relationship in interface FunctionItemType

Overrides:

relationship in class AnyFunctionType

Returns:

for example Affinity.SUBSUMES, Affinity.SAME_TYPE

explainMismatch

public java.util.Optional<java.lang.String> explainMismatch(Item item,
                                                            TypeHierarchy th)

Get extra diagnostic information about why a supplied item does not conform to this item type, if available. If extra information is returned, it should be in the form of a complete sentence, minus the closing full stop. No information should be returned for obvious cases.

Specified by:

explainMismatch in interface ItemType

Parameters:

item - the item being matched

th - the type hierarchy cache

Returns:

optionally, a message explaining why the item does not match the type

makeFunctionSequenceCoercer

public Expression makeFunctionSequenceCoercer(Expression exp,
                                              RoleDiagnostic role)
                                       throws XPathException

Description copied from class: AnyFunctionType

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

Specified by:

makeFunctionSequenceCoercer in interface FunctionItemType

Overrides:

makeFunctionSequenceCoercer in class AnyFunctionType

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 sequence of coerced functions, each on a function that calls the corresponding original function after checking the parameters

Throws:

XPathException