net.sf.saxon.value

Class AnyURIValue

public final class AnyURIValue extends StringValue

An XPath value of type xs:anyURI.

This is implemented as a subtype of StringValue even though xs:anyURI is not a subtype of xs:string in the XPath type hierarchy. This enables type promotion from URI to String to happen automatically in most cases where it is appropriate.

This implementation of xs:anyURI allows any string to be contained in the value space. It is possible to validate that the string is a "valid URI" in the sense of XML Schema Part 2 (which refers to the XLink specification and to RFC 2396); however, this validation is optional, and is not carried out by default. In particular, there is no constraint that namespace URIs, collation URIs, and the like should be valid URIs. However, casting from strings to xs:anyURI does invoke validation.

Field Summary
static AnyURIValueEMPTY_URI
Constructor Summary
AnyURIValue(CharSequence value)
Constructor
AnyURIValue(CharSequence value, AtomicType type)
Constructor for a user-defined subtype of anyURI
Method Summary
ConversionResultconvertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context)
Convert to target data type
AtomicValuecopyAsSubType(AtomicType typeLabel)
Create a copy of this atomic value, with a different type label
BuiltInAtomicTypegetPrimitiveType()
static booleanisValidURI(CharSequence value)
Check whether a string consititutes a valid URI

Field Detail

EMPTY_URI

public static final AnyURIValue EMPTY_URI

Constructor Detail

AnyURIValue

public AnyURIValue(CharSequence value)
Constructor

Parameters: value the String value. Null is taken as equivalent to "". This constructor does not check that the value is a valid anyURI instance.

AnyURIValue

public AnyURIValue(CharSequence value, AtomicType type)
Constructor for a user-defined subtype of anyURI

Parameters: value the String value. Null is taken as equivalent to "". type a user-defined subtype of anyURI. It is the caller's responsibility to ensure that this is actually a subtype of anyURI, and that the value conforms to the definition of this type.

Method Detail

convertPrimitive

public ConversionResult convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context)
Convert to target data type

Parameters: requiredType integer code representing the item type required context the XPath dynamic evaluation context

Returns: the result of the conversion, or an ErrorValue

copyAsSubType

public AtomicValue copyAsSubType(AtomicType typeLabel)
Create a copy of this atomic value, with a different type label

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

getPrimitiveType

public BuiltInAtomicType getPrimitiveType()

isValidURI

public static boolean isValidURI(CharSequence value)
Check whether a string consititutes a valid URI

Parameters: value the string to be tested

Returns: true if the string is a valid URI