net.sf.saxon.type

Interface UnionType

All Superinterfaces:

ItemType, SchemaComponent, SchemaType, SimpleType

All Known Implementing Classes:

ErrorType, NumericType

public interface UnionType
extends SimpleType, ItemType

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.

Nested Class Summary

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

SchemaComponent.ValidationStatus

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

ItemType.WithSequenceTypeCache

Field Summary

Fields inherited from interface net.sf.saxon.type.SchemaType

DERIVATION_EXTENSION, DERIVATION_LIST, DERIVATION_RESTRICTION, DERIVATION_UNION, DERIVE_BY_SUBSTITUTION

Method Summary

Modifier and Type	Method and 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 Optional<String>	explainMismatch(Item item, TypeHierarchy th) Get extra diagnostic information about why a supplied item does not conform to this item type, if available.
Iterable<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.

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

getBuiltInBaseType, getTypedValue, getWhitespaceAction, isAtomicType, isBuiltInType, isExternalType, isListType, isNamespaceSensitive, isUnionType, postprocess, preprocess, validateContent

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

allowsDerivation, analyzeContentExpression, atomize, checkTypeDerivationIsOK, getBaseType, getBlock, getDerivationMethod, getDescription, getDisplayName, getEQName, getFinalProhibitions, getFingerprint, getName, getNearestNamedType, getStructuredQName, getSystemId, getTargetNamespace, isAnonymousType, isComplexType, isIdRefType, isIdType, isSameType, isSimpleType

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

getRedefinitionLevel, getValidationStatus

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

generateJavaScriptItemTypeAcceptor, generateJavaScriptItemTypeTest, getAlphaCode, getAtomizedItemType, getGenre, getPrimitiveItemType, getPrimitiveType, getUType, isAtomicType, isAtomizable, isPlainType, isTrueItemType, matches, toExportString, toString

Method Detail

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

Iterable<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.

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 Optional<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