Package net.sf.saxon.type

Interface UnionType

All Superinterfaces:

CastingTarget, ItemType

All Known Implementing Classes:

ErrorType, LocalUnionType, NumericType, UserUnionType

public interface UnionType
extends ItemType, CastingTarget

Interface representing a union type. This may be either a built-in union type (of which there are currently two, namely ErrorType and NumericType), or a user-defined union type.

Method Summary

Modifier and Type	Method	Description
ValidationFailure	checkAgainstFacets(AtomicValue value, ConversionRules rules)	Validate an atomic value, which is known to be an instance of one of the member types of the union, against any facets (pattern facets or enumeration facets) defined at the level of the union itself.
boolean	containsListType()	Ask whether the union contains a list type among its member types
default 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.
default java.lang.String	getDescription()
java.util.List<? extends PlainType>	getPlainMemberTypes()	Get the "plain" types in the transitive membership.
SequenceType	getResultTypeOfCast()	Get the result type of a cast operation to this union type, as a sequence type.
default StructuredQName	getStructuredQName()
AtomicSequence	getTypedValue(UnicodeString value, NamespaceResolver resolver, ConversionRules rules)	Get the typed value corresponding to a given string value, assuming it is valid against this type
StructuredQName	getTypeName()	Get the name of the type.

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

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

Method Detail

getTypeName

StructuredQName getTypeName()

Get the name of the type. If the type is unnamed, return an invented type in the NamespaceConstant.ANONYMOUS namespace

Returns:

the type name

getStructuredQName

default StructuredQName getStructuredQName()

containsListType

boolean containsListType()
                  throws MissingComponentException

Ask whether the union contains a list type among its member types

Returns:

true of one of the member types is a list type

Throws:

MissingComponentException

getPlainMemberTypes

java.util.List<? extends PlainType> getPlainMemberTypes()
                                                 throws MissingComponentException

Get the "plain" types in the transitive membership. Plain types are atomic types and union types that are defined directly in terms of other plain types, without adding any restriction facets.

Returns:

the atomic types and plain union types in the transitive membership of the union type.

Throws:

MissingComponentException

getResultTypeOfCast

SequenceType getResultTypeOfCast()

Get the result type of a cast operation to this union type, as a sequence type.

Returns:

the result type of casting, as precisely as possible. For example, if all the member types of the union are derived from the same primitive type, this will return that primitive type.

getTypedValue

AtomicSequence getTypedValue(UnicodeString value,
                             NamespaceResolver resolver,
                             ConversionRules rules)
                      throws ValidationException

Get the typed value corresponding to a given string value, assuming it is valid against this type

Parameters:

value - the string value

resolver - a namespace resolver used to resolve any namespace prefixes appearing in the content of values. Can supply null, in which case any namespace-sensitive content will be rejected.

rules - the conversion rules from the configuration

Returns:

the atomic sequence comprising the typed value. The objects returned by this SequenceIterator will all be of type AtomicValue,

Throws:

ValidationException - if the supplied value is not in the lexical space of the data type

checkAgainstFacets

ValidationFailure checkAgainstFacets(AtomicValue value,
                                     ConversionRules rules)

Validate an atomic value, which is known to be an instance of one of the member types of the union, against any facets (pattern facets or enumeration facets) defined at the level of the union itself.

Parameters:

value - the Atomic Value to be checked. This must be an instance of a member type of the union

rules - the ConversionRules for the Configuration

Returns:

a ValidationFailure if the value is not valid; null if it is valid.

explainMismatch

default 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 that doesn't match this type

th - the type hierarchy cache

Returns:

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

getDescription

default java.lang.String getDescription()