com.saxonica.schema

Class UserUnionType

java.lang.Object

com.saxonica.schema.SchemaStructure

com.saxonica.schema.UserDefinedType

com.saxonica.schema.UserSimpleType

com.saxonica.schema.UserUnionType

All Implemented Interfaces:

SerializableSchemaComponent, UserSchemaComponent, Serializable, SourceLocator, ItemType, PlainType, SchemaComponent, SchemaType, SimpleType, UnionType

public class UserUnionType
extends UserSimpleType
implements PlainType, UnionType

A class that represents the XML Schema simple-type with variety union.

A "plain" union is a union that is not derived by restriction and whose member types are all either atomic types or plain union types. Only plain union types can be named in the XPath SequenceType production. (All union types, however, can act as the target of a cast expression). This class implements the interface PlainType despite the fact that not all its instances represent plain unions; to test whether a union is a plain union, use the isPlainType() method.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.saxonica.schema.UserDefinedType

extendedTypes, finalProhibitions

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

DERIVATION_EXTENSION, DERIVATION_LIST, DERIVATION_RESTRICTION, DERIVATION_UNION, DERIVE_BY_SUBSTITUTION

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

COMPONENT_FUNCTION_TYPE, FIXED_UP, INCOMPLETE, INVALID, UNVALIDATED, VALIDATED, VALIDATING

Constructor Summary

Constructors

Constructor and Description
UserUnionType(EnterpriseConfiguration config) Creates a new Union type.

Method Summary

Methods

Modifier and Type	Method and Description
void	addMemberTypeReference(TypeReference member) Add a member type to the list of member types
boolean	containsListType() Ask whether this union type includes any list types among its members
void	elaborate(SchemaCompiler compiler) Elaborate the schema component: after reloading a serialized schema component model, this expands the component with derived information needed during validation episodes.
PlainType	getAtomizedItemType() Get the item type of the atomic values that will be produced when an item of this type is atomized
double	getDefaultPriority() Determine the default priority of this item type when used on its own as a Pattern
List<TypeReference>	getMemberTypeReferences() Get the list of member types
Set<PlainType>	getPlainMemberTypes() Get the list of plain types that are subsumed by this type
ItemType	getPrimitiveItemType() Method defined in ItemType: get a primitive supertype in the ItemType type hierarchy
int	getPrimitiveType() Method defined in ItemType: get a primitive supertype in the ItemType type hierarchy
SequenceType	getResultTypeOfCast() Get the SequenceType that most accurately describes the result of casting a value to this union type
ItemType	getSuperType(TypeHierarchy th) Method defined in ItemType: get a supertype in the ItemType type hierarchy
AtomicSequence	getTypedValue(CharSequence value, NamespaceResolver resolver, ConversionRules rules) Get the typed value corresponding to a given string value, assuming it is valid against this type
boolean	isAtomicType() Ask whether this Simple Type is an atomic type
boolean	isAtomizable() Ask whether values of this type are atomizable
boolean	isBuiltInType() Determine whether this is a built-in type or a user-defined type
boolean	isIdRefType() Ask whether this type is an IDREF or IDREFS type.
boolean	isIdType() Ask whether this type is an ID type.
boolean	isListType() Determine whether this is a list type
boolean	isNamespaceSensitive() Test whether this type is namespace sensitive, that is, if a namespace context is needed to translate between the lexical space and the value space.
boolean	isPlainType() Ask whether this Union type is a "plain type", defined as a union type whose member types are all atomic types or plain unions.
boolean	isUnionType() Return true if this type is a union type (that is, if its variety is union)
void	lookForCycles(Stack references, SchemaCompiler compiler) This method is called to look for cycles.
boolean	matches(Item item, XPathContext context) Test whether a given item conforms to this type
boolean	matchesItem(Item item, boolean allowURIPromotion, Configuration config) Test whether a given item conforms to this type
void	serializeVariety(SchemaModelSerializer serializer) Serialize the schema component
void	setMemberTypeReferences(List<TypeReference> members) Set the member types of this union type.
String	toString() Produce a string representation of the type name.
boolean	validate(SchemaCompiler compiler) Validate this Union, replacing all unresolved forwards references at the same time
ValidationFailure	validateContent(CharSequence value, NamespaceResolver nsResolver, ConversionRules rules) Check whether a given input string is valid according to this SimpleType
void	visitNamedSchemaComponents(SchemaComponentVisitor visitor) Visit all the schema components used in this ItemType definition

Methods inherited from class com.saxonica.schema.UserSimpleType

addFacet, addInheritedFacets, analyzeContentExpression, applyWhitespaceNormalization, atomize, checkAgainstFacets, checkTypeDerivationIsOK, convertFacetValues, getBuiltInBaseType, getComponentAsFunction, getComponentAsFunction, getContextComponent, getEQName, getExtendedFacetList, getFacet, getLocalFacetList, getWhitespaceAction, isSimpleType, isTypeDerivationOK, mergeEnumerationFacets, postprocess, preprocess, serialize, setContextComponent, setFacetList

Methods inherited from class com.saxonica.schema.UserDefinedType

allowsDerivation, containingDeclarationIsElement, getBaseType, getBaseTypeFingerprint, getBaseTypeReference, getBlock, getContainingDeclarationName, getDerivationMethod, getDescription, getDisplayName, getExtensionTypes, getFinalProhibitions, getFingerprint, getLocalName, getName, getNameCode, getNamePool, getTargetNamespace, isAnonymousType, isComplexType, isExternalType, isSameType, registerExtensionType, setBaseTypeReference, setContainingDeclaration, setDerivationMethod, setDerivationMethodName, setExtendedTypes, setFinalProhibitions, setNameCode

Methods inherited from class com.saxonica.schema.SchemaStructure

fixup, getColumnNumber, getConfiguration, getFixupStatus, getLineNumber, getPublicId, getRedefinitionLevel, getSchemaDocumentURI, getSystemId, getValidationStatus, makeXPathExpressionPropertyRecord, setConfiguration, setFixupStatus, setLineNumber, setLocator, setRedefinitionLevel, setSchemaDocumentURI, setSystemId, setValidationStatus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

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

isExternalType

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

getBuiltInBaseType, getWhitespaceAction, isExternalType, postprocess, preprocess

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

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

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

getComponentAsFunction, getRedefinitionLevel, getValidationStatus

Methods inherited from interface com.saxonica.schema.UserSchemaComponent

fixup

Constructor Detail

UserUnionType

public UserUnionType(EnterpriseConfiguration config)

Creates a new Union type.

Parameters:

config - the Configuration for this Union (Cannot be null)

Method Detail

setMemberTypeReferences

public void setMemberTypeReferences(List<TypeReference> members)

Set the member types of this union type.

Parameters:

members - a list of TypeReference objects

addMemberTypeReference

public void addMemberTypeReference(TypeReference member)

Add a member type to the list of member types

Parameters:

member - a reference to a new member type

getMemberTypeReferences

public List<TypeReference> getMemberTypeReferences()

Get the list of member types

Returns:

a List containing TypeReference objects

isAtomicType

public boolean isAtomicType()

Ask whether this Simple Type is an atomic type

Specified by:

isAtomicType in interface ItemType

Specified by:

isAtomicType in interface SchemaType

Specified by:

isAtomicType in interface SimpleType

Overrides:

isAtomicType in class UserSimpleType

Returns:

false, this is not an atomic type

containsListType

public boolean containsListType()

Ask whether this union type includes any list types among its members

Specified by:

containsListType in interface UnionType

isPlainType

public boolean isPlainType()

Ask whether this Union type is a "plain type", defined as a union type whose member types are all atomic types or plain unions. That is, it disallows unions that are derived by restriction from another union. The significance of this is that an atomic value will never match a non-plain union type

Specified by:

isPlainType in interface ItemType

Returns:

true if this is ANY_ATOMIC_TYPE or a subtype thereof, or a "plain" union type (that is, unions of atomic types that impose no further restrictions)

getResultTypeOfCast

public SequenceType getResultTypeOfCast()

Get the SequenceType that most accurately describes the result of casting a value to this union type

Specified by:

getResultTypeOfCast in interface UnionType

Returns:

the most precise SequenceType for the result of casting

isIdType

public boolean isIdType()

Ask whether this type is an ID type. This is defined to be any simple type who typed value may contain atomic values of type xs:ID: that is, it includes types derived from ID by restriction, list, or union. Note that for a node to be treated as an ID in XSD 1.0, its typed value must be a *single* atomic value of type ID; the type of the node, however, can still allow a list or union. This changes in XSD 1.1, where a list of IDs is allowed.

Specified by:

isIdType in interface SchemaType

Overrides:

isIdType in class UserSimpleType

Returns:

true if this type is an ID type

isIdRefType

public boolean isIdRefType()

Ask whether this type is an IDREF or IDREFS type. This is defined to be any simple type who typed value may contain atomic values of type xs:IDREF: that is, it includes types derived from IDREF or IDREFS by restriction, list, or union

Specified by:

isIdRefType in interface SchemaType

Overrides:

isIdRefType in class UserSimpleType

Returns:

true if this type is an IDREF type

isBuiltInType

public boolean isBuiltInType()

Determine whether this is a built-in type or a user-defined type

Specified by:

isBuiltInType in interface SimpleType

Returns:

true if this is a built-in type

isListType

public boolean isListType()

Determine whether this is a list type

Specified by:

isListType in interface SimpleType

Overrides:

isListType in class UserSimpleType

Returns:

true if this is a list type

isUnionType

public boolean isUnionType()

Return true if this type is a union type (that is, if its variety is union)

Specified by:

isUnionType in interface SimpleType

Overrides:

isUnionType in class UserSimpleType

Returns:

true for a union type

isNamespaceSensitive

public boolean isNamespaceSensitive()

Test whether this type is namespace sensitive, that is, if a namespace context is needed to translate between the lexical space and the value space. This is true for types derived from, or containing, QNames and NOTATIONs

Specified by:

isNamespaceSensitive in interface SimpleType

Returns:

true if any of the member types is namespace-sensitive

validate

public boolean validate(SchemaCompiler compiler)
                 throws SchemaException

Validate this Union, replacing all unresolved forwards references at the same time

Specified by:

validate in interface UserSchemaComponent

Overrides:

validate in class UserSimpleType

Parameters:

compiler - used for error reporting

Returns:

true when this Schema definition is valid, otherwise false.

Throws:

SchemaException

elaborate

public void elaborate(SchemaCompiler compiler)
               throws SchemaException

Description copied from class: UserSimpleType

Elaborate the schema component: after reloading a serialized schema component model, this expands the component with derived information needed during validation episodes. The model is assumed to be valid.

Specified by:

elaborate in interface UserSchemaComponent

Overrides:

elaborate in class UserSimpleType

Parameters:

compiler - the schema compiler

Throws:

SchemaException - if a fatal error occurs

lookForCycles

public void lookForCycles(Stack references,
                 SchemaCompiler compiler)
                   throws SchemaException,
                          UnresolvedReferenceException

This method is called to look for cycles. The object implementing this method is required (a) to raise an exception if the object itself appears in the list of references, (b) to add itself to the list of references, and (c) to call the lookForCycles method on all the objects that it references.

Specified by:

lookForCycles in interface UserSchemaComponent

Overrides:

lookForCycles in class SchemaStructure

Parameters:

references - A list of objects that contain direct or indirect references to this object, and that must therefore not be referred to from this object.

compiler - used for error reporting

Throws:

SchemaException

UnresolvedReferenceException

validateContent

public ValidationFailure validateContent(CharSequence value,
                                NamespaceResolver nsResolver,
                                ConversionRules rules)

Check whether a given input string is valid according to this SimpleType

Specified by:

validateContent in interface SimpleType

Parameters:

value - the input string to be checked

nsResolver - a namespace resolver used to resolve namespace prefixes if the type is namespace sensitive. The value supplied may be null; in this case any namespace-sensitive content will throw an UnsupportedOperationException.

rules - the configuration-wide conversion rules

Returns:

null if validation succeeds; return a ValidationFailure describing the validation failure if validation fails

Throws:

UnsupportedOperationException - if the type is namespace-sensitive and no namespace resolver is supplied

getTypedValue

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

Description copied from interface: SimpleType

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

Specified by:

getTypedValue in interface SimpleType

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:

an iterator over the atomic sequence comprising the typed value. The objects returned by this SequenceIterator will all be of type AtomicValue, The next() method on the iterator throws no checked exceptions, although it is not actually declared as an UnfailingIterator.

Throws:

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

serializeVariety

public void serializeVariety(SchemaModelSerializer serializer)
                      throws XPathException

Serialize the schema component

Specified by:

serializeVariety in class UserSimpleType

Throws:

XPathException

matches

public boolean matches(Item item,
              XPathContext context)

Test whether a given item conforms to this type

Specified by:

matches in interface ItemType

Parameters:

item - The item to be tested

context - the XPath dynamic evaluation context

Returns:

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

matchesItem

public boolean matchesItem(Item item,
                  boolean allowURIPromotion,
                  Configuration config)

Description copied from interface: ItemType

Test whether a given item conforms to this type

Specified by:

matchesItem in interface ItemType

Parameters:

item - The item to be tested

allowURIPromotion - if a URI value is to be treated as a string

config - the Saxon configuration

Returns:

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

getSuperType

public ItemType getSuperType(TypeHierarchy th)

Method defined in ItemType: get a supertype in the ItemType type hierarchy

Specified by:

getSuperType in interface ItemType

Parameters:

th - the type hierarchy cache

Returns:

BuiltInAtomicType.ANY_ATOMIC

getPrimitiveItemType

public ItemType getPrimitiveItemType()

Method defined in ItemType: get a primitive supertype in the ItemType type hierarchy

Specified by:

getPrimitiveItemType in interface ItemType

Returns:

BuiltInAtomicType.ANY_ATOMIC

getPrimitiveType

public int getPrimitiveType()

Method defined in ItemType: get a primitive supertype in the ItemType type hierarchy

Specified by:

getPrimitiveType in interface ItemType

Returns:

StandardNames.XS_ANY_ATOMIC_TYPE

getAtomizedItemType

public PlainType getAtomizedItemType()

Description copied from interface: ItemType

Get the item type of the atomic values that will be produced when an item of this type is atomized

Specified by:

getAtomizedItemType in interface ItemType

Returns:

the best available item type of the atomic values that will be produced when an item of this type is atomized, or null if it is known that atomization will throw an error.

isAtomizable

public boolean isAtomizable()

Description copied from interface: ItemType

Ask whether values of this type are atomizable

Specified by:

isAtomizable in interface ItemType

Returns:

true unless it is known that these items will be elements with element-only content, or function items, in which case return false

visitNamedSchemaComponents

public void visitNamedSchemaComponents(SchemaComponentVisitor visitor)
                                throws XPathException

Description copied from interface: ItemType

Visit all the schema components used in this ItemType definition

Specified by:

visitNamedSchemaComponents in interface ItemType

Parameters:

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

Throws:

XPathException - if an error occurs

getPlainMemberTypes

public Set<PlainType> getPlainMemberTypes()

Get the list of plain types that are subsumed by this type

Specified by:

getPlainMemberTypes in interface PlainType

Specified by:

getPlainMemberTypes in interface UnionType

Returns:

for an atomic type, the type itself; for a plain union type, the list of plain types in its transitive membership, in declaration order

getDefaultPriority

public double getDefaultPriority()

Description copied from interface: ItemType

Determine the default priority of this item type when used on its own as a Pattern

Specified by:

getDefaultPriority in interface ItemType

Returns:

the default priority

toString

public String toString()

Produce a string representation of the type name. If the type is anonymous, an internally-allocated type name will be returned.

Overrides:

toString in class Object

Returns:

the name of the atomic type in the form Q{uri}local