net.sf.saxon.type
Class TypeHierarchy

java.lang.Object
  net.sf.saxon.type.TypeHierarchy

All Implemented Interfaces:

Serializable

public class TypeHierarchy
extends Object
implements Serializable

This class exists to provide answers to questions about the type hierarchy. Because such questions are potentially expensive, it caches the answers. There is one instance of this class for a Configuration.

See Also:

Serialized Form

Field Summary

static int	DISJOINT Constant denoting relationship between two types: A is disjoint from B
static int	OVERLAPS Constant denoting relationship between two types: A overlaps B
static int	SAME_TYPE Constant denoting relationship between two types: A is the same type as B
static int	SUBSUMED_BY Constant denoting relationship between two types: A is subsumed by B
static int	SUBSUMES Constant denoting relationship between two types: A subsumes B

Constructor Summary

TypeHierarchy(Configuration config)
Create the type hierarchy cache for a configuration

Method Summary

Configuration	getConfiguration() Get the Saxon configuration to which this type hierarchy belongs
boolean	isIdCode(int typeCode) Test whether a type annotation code represents the type xs:ID or one of its subtypes
boolean	isIdrefsCode(int typeCode) Test whether a type annotation code represents the type xs:IDREF, xs:IDREFS or one of their subtypes
boolean	isSubType(ItemType subtype, ItemType supertype) Determine whether type A is type B or one of its subtypes, recursively.
int	relationship(ItemType t1, ItemType t2) Determine the relationship of one item type to another.
static int	schemaTypeRelationship(SchemaType s1, SchemaType s2) Get the relationship of two schema types to each other

Methods inherited from class java.lang.Object

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

Field Detail

SAME_TYPE

public static final int SAME_TYPE

Constant denoting relationship between two types: A is the same type as B

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Constant Field Values

SUBSUMES

public static final int SUBSUMES

Constant denoting relationship between two types: A subsumes B

See Also:

Constant Field Values

SUBSUMED_BY

public static final int SUBSUMED_BY

Constant denoting relationship between two types: A is subsumed by B

See Also:

Constant Field Values

OVERLAPS

public static final int OVERLAPS

Constant denoting relationship between two types: A overlaps B

See Also:

Constant Field Values

DISJOINT

public static final int DISJOINT

Constant denoting relationship between two types: A is disjoint from B

See Also:

Constant Field Values

Constructor Detail

TypeHierarchy

public TypeHierarchy(Configuration config)

Create the type hierarchy cache for a configuration

Parameters:

config - the configuration

Method Detail

getConfiguration

public Configuration getConfiguration()

Get the Saxon configuration to which this type hierarchy belongs

Returns:

the configuration

isSubType

public boolean isSubType(ItemType subtype,
                         ItemType supertype)

Determine whether type A is type B or one of its subtypes, recursively. "Subtype" here means a type that is subsumed, that is, a type whose instances are a subset of the instances of the other type.

Parameters:

subtype - identifies the first type

supertype - identifies the second type

Returns:

true if the first type is the second type or is subsumed by the second type

relationship

public int relationship(ItemType t1,
                        ItemType t2)

Determine the relationship of one item type to another.

Parameters:

t1 - the first item type

t2 - the second item type

Returns:

SAME_TYPE if the types are the same; SUBSUMES if the first type subsumes the second (that is, all instances of the second type are also instances of the first); SUBSUMED_BY if the second type subsumes the first; OVERLAPS if the two types overlap (have a non-empty intersection, but neither subsumes the other); DISJOINT if the two types are disjoint (have an empty intersection)

isIdCode

public boolean isIdCode(int typeCode)

Test whether a type annotation code represents the type xs:ID or one of its subtypes

Parameters:

typeCode - the type annotation to be tested

Returns:

true if the type annotation represents an xs:ID

isIdrefsCode

public boolean isIdrefsCode(int typeCode)

Test whether a type annotation code represents the type xs:IDREF, xs:IDREFS or one of their subtypes

Parameters:

typeCode - the type annotation to be tested

Returns:

true if the type annotation represents an xs:IDREF or xs:IDREFS or a subtype thereof

schemaTypeRelationship

public static int schemaTypeRelationship(SchemaType s1,
                                         SchemaType s2)

Get the relationship of two schema types to each other

Parameters:

s1 - the first type

s2 - the second type

Returns:

the relationship of the two types, as one of the constants SAME_TYPE, SUBSUMES, SUBSUMED_BY, DISJOINT