Package 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
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(... ,*).
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Nested Class Summary
Nested classes/interfaces inherited from interface net.sf.saxon.type.ItemType
ItemType.WithSequenceTypeCache
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Field Summary
Fields inherited from class net.sf.saxon.type.AnyFunctionType
ANY_FUNCTION
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Constructor Summary
ConstructorsConstructorDescriptionTupleItemType
(List<String> names, List<SequenceType> types, boolean extensible) -
Method Summary
Modifier and TypeMethodDescriptionboolean
Test whether this function type equals another function typeexplainMismatch
(Item item, TypeHierarchy th) Get extra diagnostic information about why a supplied item does not conform to this item type, if available.Get the argument types of this map, viewed as a functionint
getArity()
Get the arity (number of arguments) of this function typeGet an alphabetic code representing the type, or at any rate, the nearest built-in type from which this type is derived.double
Get the default priority when this ItemType is used as an XSLT patternGet the names of all the fieldsgetFieldType
(String field) Get the type of a given fieldgetGenre()
Determine the Genre (top-level classification) of this typeGet the result type of this tuple type, viewed as a functionint
hashCode()
Returns a hash code value for the object.boolean
Ask whether this function item type is an array type.boolean
Ask whether the tuple type is extensible, that is, whether fields other than those named are permittedboolean
Ask whether this function item type is a map type.makeFunctionSequenceCoercer
(Expression exp, RoleDiagnostic role) Create an expression whose effect is to apply function coercion to coerce a function from this type to another typeboolean
matches
(Item item, TypeHierarchy th) Test whether a given item conforms to this typerelationship
(FunctionItemType other, TypeHierarchy th) Determine the relationship of one function item type to anotherReturn a string representation of this ItemType suitable for use in stylesheet export files.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
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Constructor Details
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TupleItemType
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Method Details
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getGenre
Determine the Genre (top-level classification) of this type- Specified by:
getGenre
in interfaceFunctionItemType
- Specified by:
getGenre
in interfaceItemType
- Returns:
- the Genre to which this type belongs, specifically
Genre.MAP
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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 interfaceFunctionItemType
- Overrides:
isMapType
in classAnyFunctionType
- Returns:
- true if this FunctionItemType is a map type
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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 interfaceFunctionItemType
- Overrides:
isArrayType
in classAnyFunctionType
- Returns:
- true if this FunctionItemType is an array type
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getFieldNames
Get the names of all the fields- Specified by:
getFieldNames
in interfaceTupleType
- Returns:
- the names of the fields (in arbitrary order)
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getFieldType
Get the type of a given field- Specified by:
getFieldType
in interfaceTupleType
- Parameters:
field
- the name of the field- Returns:
- the type of the field if it is defined, or null otherwise
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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 interfaceTupleType
- Returns:
- true if fields other than the named fields are permitted to appear
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matches
Test whether a given item conforms to this type- Specified by:
matches
in interfaceItemType
- Overrides:
matches
in classAnyFunctionType
- Parameters:
item
- The item to be testedth
- type hierarchy data- Returns:
- true if the item is an instance of this type; false otherwise
- Throws:
XPathException
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getArity
public int getArity()Get the arity (number of arguments) of this function type- Returns:
- the number of argument types in the function signature
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getArgumentTypes
Get the argument types of this map, viewed as a function- Specified by:
getArgumentTypes
in interfaceFunctionItemType
- Overrides:
getArgumentTypes
in classAnyFunctionType
- Returns:
- the list of argument types of this map, viewed as a function
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getResultType
Get the result type of this tuple type, viewed as a function- Specified by:
getResultType
in interfaceFunctionItemType
- Overrides:
getResultType
in classAnyFunctionType
- Returns:
- the result type of this tuple type, viewed as a function
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getDefaultPriority
public double getDefaultPriority()Get the default priority when this ItemType is used as an XSLT pattern- Specified by:
getDefaultPriority
in interfaceItemType
- Overrides:
getDefaultPriority
in classAnyFunctionType
- Returns:
- the default priority
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toString
Produce a representation of this type name for use in error messages.- Specified by:
toString
in interfaceItemType
- Overrides:
toString
in classAnyFunctionType
- Returns:
- a string representation of the type, in notation resembling but not necessarily identical to XPath syntax
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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 interfaceItemType
- Returns:
- the string representation as an instance of the XPath ItemType construct
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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 interfaceItemType
- Overrides:
getBasicAlphaCode
in classAnyFunctionType
- Returns:
- the alphacode for the nearest containing built-in type
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equals
Test whether this function type equals another function type -
hashCode
public int hashCode()Returns a hash code value for the object. -
relationship
Determine the relationship of one function item type to another- Specified by:
relationship
in interfaceFunctionItemType
- Overrides:
relationship
in classAnyFunctionType
- Returns:
- for example
Affinity.SUBSUMES
,Affinity.SAME_TYPE
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explainMismatch
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 interfaceItemType
- Parameters:
item
- the item being matchedth
- the type hierarchy cache- Returns:
- optionally, a message explaining why the item does not match the type
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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 interfaceFunctionItemType
- Overrides:
makeFunctionSequenceCoercer
in classAnyFunctionType
- 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
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