net.sf.saxon.ma.map

Class TupleItemType

java.lang.Object

net.sf.saxon.type.AnyFunctionType

net.sf.saxon.ma.map.TupleItemType

All Implemented Interfaces:

FunctionItemType, ItemType

public class TupleItemType
extends AnyFunctionType

An instance of this class represents a specific tuple item type, for example tuple(x: xs:double, y: 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.

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)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other) Test whether this function type equals another function type
java.lang.String	generateJavaScriptItemTypeTest(ItemType knownToBe, int targetVersion) Generate Javascript code to test whether an item conforms to this item type
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
SequenceType	getFieldType(java.lang.String field) Get the type of a given field
SequenceType	getResultType() Get the result type of this map, 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	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
int	relationship(FunctionItemType other, TypeHierarchy th) Determine the relationship of one function item type to another
java.lang.String	toString() Produce a representation of this type name for use in error messages.
void	visitNamedSchemaComponents(SchemaComponentVisitor visitor) Visit all the schema components used in this ItemType definition

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

TupleItemType

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

Method Detail

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

getFieldType

public SequenceType getFieldType(java.lang.String field)

Get the type of a given field

Parameters:

field - the name of the field

Returns:

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

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 map, viewed as a function

Specified by:

getResultType in interface FunctionItemType

Overrides:

getResultType in class AnyFunctionType

Returns:

the result type of this map, viewed as a function

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

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 int 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 TypeHierarchy.SUBSUMES, TypeHierarchy.SAME_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

visitNamedSchemaComponents

public void visitNamedSchemaComponents(SchemaComponentVisitor visitor)
                                throws XPathException

Visit all the schema components used in this ItemType definition

Specified by:

visitNamedSchemaComponents in interface ItemType

Overrides:

visitNamedSchemaComponents in class AnyFunctionType

Parameters:

visitor - the visitor class to be called when each component is visited

Throws:

XPathException - if an error occurs

generateJavaScriptItemTypeTest

public java.lang.String generateJavaScriptItemTypeTest(ItemType knownToBe,
                                                       int targetVersion)
                                                throws XPathException

Generate Javascript code to test whether an item conforms to this item type

Specified by:

generateJavaScriptItemTypeTest in interface ItemType

Overrides:

generateJavaScriptItemTypeTest in class AnyFunctionType

Parameters:

knownToBe - a type that this item is known to conform to

targetVersion -

Returns:

a Javascript instruction or sequence of instructions, which can be used as the body of a Javascript function, and which returns a boolean indication whether the value of the variable "item" is an instance of this item type.

Throws:

XPathException - if JS code cannot be generated for this item type, for example because the test is schema-aware.