net.sf.saxon.value
Class QNameValue

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

All Implemented Interfaces:

Serializable, Expression, Item

public final class QNameValue
extends AtomicValue

A QName value

See Also:

Serialized Form

Constructor Summary

QNameValue(String uri, String localName)
Constructor

Method Summary

int	conversionPreference(Class required) Get conversion preference for this value to a Java class.
AtomicValue	convert(int requiredType) Convert to target data type
Object	convertToJava(Class target) Convert to Java object (for passing to external functions)
void	display(int level, NamePool pool) Diagnostic print of expression structure
boolean	equals(Object other) Determine if two anyURI values are equal
AtomicValue	getComponent(int part) Get a component.
ItemType	getItemType() Return the type of the expression
String	getLocalName() Get the local part
String	getNamespaceURI() Get the namespace part (null means no namespace)
String	getStringValue() Get the string value as a String.
int	hashCode()
static String	makeTriple(String prefix, String uri, String localName) Internally we sometimes hold QNames in the form "{uri}[prefix]:local-name".
static String[]	parseTriple(CharSequence triple) This method extracts the three components of a QNameTriple.
String	toString()

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

convert, convert, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getPrimitiveValue, getTypedValue, iterate

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

analyze, asItem, asValue, collapseWhitespace, getDependencies, getSpecialProperties, getSubExpressions, inverse, normalizeWhitespace, promote, simplify, stringToInteger, stringToNumber, trimWhitespace

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

QNameValue

public QNameValue(String uri,
                  String localName)
           throws XPathException

Constructor

Parameters:

uri - The namespace part of the QName

localName - The local part of the QName.

Throws:

XPathException

Method Detail

getStringValue

public String getStringValue()
                      throws XPathException

Get the string value as a String. QNames are the only kind of values that cannot be converted to a string.

Returns:

the string value of the item

Throws:

XPathException - if the string value cannot be obtained. Some items have no string value, e.g. a QName

getLocalName

public String getLocalName()

Get the local part

getNamespaceURI

public String getNamespaceURI()

Get the namespace part (null means no namespace)

getComponent

public AtomicValue getComponent(int part)

Get a component. Returns null if the namespace-uri component is requested and is not present.

Overrides:

getComponent in class AtomicValue

Parameters:

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

Returns:

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

convert

public AtomicValue convert(int requiredType)
                    throws XPathException

Convert to target data type

Specified by:

convert in class AtomicValue

Parameters:

requiredType - an integer identifying the required atomic type

Returns:

an AtomicValue, a value of the required type

Throws:

XPathException - if the conversion is not possible

getItemType

public ItemType getItemType()

Return the type of the expression

Returns:

Type.QNAME (always)

equals

public boolean equals(Object other)

Determine if two anyURI values are equal

Overrides:

equals in class Object

Throws:

ClassCastException - if they are not comparable

hashCode

public int hashCode()

Overrides:

hashCode in class Object

conversionPreference

public int conversionPreference(Class required)

Get conversion preference for this value to a Java class. A low result indicates higher preference.

Overrides:

conversionPreference in class AtomicValue

convertToJava

public Object convertToJava(Class target)
                     throws XPathException

Convert to Java object (for passing to external functions)

Overrides:

convertToJava in class AtomicValue

Parameters:

target - The class required by the external function

Returns:

an object of the target class

Throws:

XPathException

display

public void display(int level,
                    NamePool pool)

Diagnostic print of expression structure

Parameters:

level - indentation level for this expression

toString

public String toString()

Overrides:

toString in class Object

makeTriple

public static String makeTriple(String prefix,
                                String uri,
                                String localName)

Internally we sometimes hold QNames in the form "{uri}[prefix]:local-name". This is referred to as a QNameTriple This method constructs a QNameTriple from its components

parseTriple

public static String[] parseTriple(CharSequence triple)

This method extracts the three components of a QNameTriple. They are returned as an array of three strings containing respectively the prefix, the uri, and the local name