net.sf.saxon.value
Class QNameValue

java.lang.Object
  net.sf.saxon.value.Value
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.QualifiedNameValue
              net.sf.saxon.value.QNameValue

All Implemented Interfaces:

Serializable, PullEvent, SequenceIterable, GroundedValue, Item, ValueRepresentation, ConversionResult

public class QNameValue
extends QualifiedNameValue

A QName value. This implements the so-called "triples proposal", in which the prefix is retained as part of the value. The prefix is not used in any operation on a QName other than conversion of the QName to a string.

See Also:

Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.value.Value

EMPTY_CLASS_ARRAY, INDETERMINATE_ORDERING

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Constructor Summary

QNameValue(NamePool namePool, int nameCode)
Constructor starting from a NamePool namecode

QNameValue(String prefix, String uri, String localName)
Constructor for a QName that is known to be valid.

QNameValue(String prefix, String uri, String localName, AtomicType type)
Constructor for a QName that is known to be valid, allowing a user-defined subtype of QName to be specified.

QNameValue(String prefix, String uri, String localName, AtomicType type, NameChecker checker)
Constructor.

QNameValue(StructuredQName qName, AtomicType typeLabel)
Constructor

Method Summary

ConversionResult	convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context) Convert a QName to target data type
AtomicValue	copyAsSubType(AtomicType typeLabel) Create a copy of this atomic value, with a different type label
boolean	equals(Object other) Determine if two QName values are equal.
AtomicValue	getComponent(int part) Get a component.
BuiltInAtomicType	getPrimitiveType() Determine the primitive type of the value.
Comparable	getSchemaComparable() Get a Comparable value that implements the XML Schema ordering comparison semantics for this value.
StructuredQName	toStructuredQName() Convert to a StructuredQName

Methods inherited from class net.sf.saxon.value.QualifiedNameValue

allocateNameCode, convertToJava, getClarkName, getLocalName, getNamespaceURI, getPrefix, getStringValue, getXPathComparable, hashCode, makeQName, makeQName, toString

Methods inherited from class net.sf.saxon.value.AtomicValue

asAtomic, checkPermittedContents, convert, convert, effectiveBooleanValue, getCardinality, getItemType, getLength, getStringValueCS, getTypedValue, getTypeLabel, isNaN, itemAt, iterate, process, setTypeLabel, subsequence

Methods inherited from class net.sf.saxon.value.Value

asItem, asItem, asIterator, asValue, convertJavaObjectToXPath, convertToJava, fromItem, getCanonicalLexicalRepresentation, getIterator, iterate, makeQNameValue, reduce, stringToNumber

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

QNameValue

public QNameValue(String prefix,
                  String uri,
                  String localName)

Constructor for a QName that is known to be valid. No validation takes place.

Parameters:

prefix - The prefix part of the QName (not used in comparisons). Use "" to represent the default prefix.

uri - The namespace part of the QName. Use "" to represent the non-namespace.

localName - The local part of the QName

QNameValue

public QNameValue(String prefix,
                  String uri,
                  String localName,
                  AtomicType type)

Constructor for a QName that is known to be valid, allowing a user-defined subtype of QName to be specified. No validation takes place.

Parameters:

prefix - The prefix part of the QName (not used in comparisons). Use "" to represent the default prefix (but null is also accepted)

uri - The namespace part of the QName. Use null to represent the non-namespace (but "" is also accepted).

localName - The local part of the QName

type - The type label, xs:QName or a subtype of xs:QName

QNameValue

public QNameValue(NamePool namePool,
                  int nameCode)

Constructor starting from a NamePool namecode

Parameters:

namePool - The name pool containing the specified name code

nameCode - The name code identifying this name in the name pool

QNameValue

public QNameValue(String prefix,
                  String uri,
                  String localName,
                  AtomicType type,
                  NameChecker checker)
           throws XPathException

Constructor. This constructor validates that the local part is a valid NCName.

Parameters:

prefix - The prefix part of the QName (not used in comparisons). Use "" to represent the default prefix (but null is also accepted). Note that the prefix is not checked for lexical correctness, because in most cases it will already have been matched against in-scope namespaces. Where necessary the caller must check the prefix.

uri - The namespace part of the QName. Use null to represent the non-namespace (but "" is also accepted).

localName - The local part of the QName

type - The atomic type, which must be either xs:QName, or a user-defined type derived from xs:QName by restriction

checker - NameChecker used to check the name against XML 1.0 or XML 1.1 rules. Supply null if the name does not need to be checked (the caller asserts that it is known to be valid)

Throws:

XPathException - if the local part of the name is malformed or if the name has a null namespace with a non-empty prefix

QNameValue

public QNameValue(StructuredQName qName,
                  AtomicType typeLabel)

Constructor

Parameters:

qName - the name as a StructuredQName

typeLabel - idenfies a subtype of xs:QName

Method Detail

toStructuredQName

public StructuredQName toStructuredQName()

Convert to a StructuredQName

Returns:

the name as a StructuredQName

copyAsSubType

public AtomicValue copyAsSubType(AtomicType typeLabel)

Create a copy of this atomic value, with a different type label

Specified by:

copyAsSubType in class AtomicValue

Parameters:

typeLabel - the type label of the new copy. The caller is responsible for checking that the value actually conforms to this type.

Returns:

the copied value

getPrimitiveType

public BuiltInAtomicType getPrimitiveType()

Determine the primitive type of the value. This delivers the same answer as getItemType().getPrimitiveItemType(). The primitive types are the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration, and xs:untypedAtomic. For external objects, the result is AnyAtomicType.

Specified by:

getPrimitiveType in class AtomicValue

Returns:

the primitive type

convertPrimitive

public ConversionResult convertPrimitive(BuiltInAtomicType requiredType,
                                         boolean validate,
                                         XPathContext context)

Convert a QName to target data type

Parameters:

requiredType - an integer identifying the required atomic type

context - XPath dynamic context

validate - true if validation is required. If set to false, the caller guarantees that the value is valid for the target data type, and that further validation is therefore not required. Note that a validation failure may be reported even if validation was not requested.

Returns:

an AtomicValue, a value of the required type; or an ErrorValue

getComponent

public AtomicValue getComponent(int part)

Get a component. Returns a zero-length string if the namespace-uri component is requested and is not present.

Overrides:

getComponent in class AtomicValue

Parameters:

part - either Component.LOCALNAME or Component.NAMESPACE indicating which component of the value is required

Returns:

either the local name or the namespace URI, in each case as a StringValue

equals

public boolean equals(Object other)

Determine if two QName values are equal. This comparison ignores the prefix part of the value.

Specified by:

equals in class AtomicValue

Parameters:

other - the other value

Returns:

true if the other operand is an atomic value and the two values are equal as defined by the XPath eq operator

Throws:

ClassCastException - if they are not comparable

getSchemaComparable

public Comparable getSchemaComparable()

Description copied from class: AtomicValue

Get a Comparable value that implements the XML Schema ordering comparison semantics for this value. An implementation must be provided for all atomic types.

In the case of data types that are partially ordered, the returned Comparable extends the standard semantics of the compareTo() method by returning the value Value.INDETERMINATE_ORDERING when there is no defined order relationship between two given values. This value is also returned when two values of different types are compared.

Specified by:

getSchemaComparable in class AtomicValue

Returns:

a Comparable that follows XML Schema comparison rules