net.sf.saxon.value
Class UntypedAtomicValue

java.lang.Object
  net.sf.saxon.value.Value
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.StringValue
              net.sf.saxon.value.UntypedAtomicValue

All Implemented Interfaces:

Serializable, Comparable, SequenceIterable, Item, ValueRepresentation

public class UntypedAtomicValue
extends StringValue

An Untyped Atomic value. This inherits from StringValue for implementation convenience, even though an untypedAtomic value is not a String in the data model type hierarchy.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.saxon.value.StringValue

StringValue.CharacterIterator

Field Summary

static UntypedAtomicValue

ZERO_LENGTH_UNTYPED

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

EMPTY_STRING, FALSE, SINGLE_SPACE, TRUE

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

Constructor Summary

UntypedAtomicValue(CharSequence value)
Constructor

Method Summary

int	compareTo(AtomicValue other, StringCollator collator, XPathContext context) Compare an untypedAtomic value with another value, using a given collator to perform any string comparisons.
AtomicValue	convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context) Convert to target data type
AtomicValue	copy(AtomicType typeLabel) Create a copy of this atomic value, with a different type label
BuiltInAtomicType	getPrimitiveType() Determine the primitive type of the value.
DoubleValue	toDouble() Convert the value to a double, throwing an error if conversion is not possible

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

codepointEquals, containsSurrogatePairs, contract, convertStringToAtomicType, convertStringToBuiltInType, convertToJava, effectiveBooleanValue, equals, expand, expand, getSchemaComparable, getStringLength, getStringLength, getStringValue, getStringValueCS, getXPathComparable, hashCode, isZeroLength, iterateCharacters, makeRestrictedString, makeStringValue, setStringValueCS, toString

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

checkPermittedContents, convert, convert, getCardinality, getComponent, getItemType, getLength, getTypedValue, getTypeLabel, hasBuiltInType, isMultiValued, itemAt, iterate, process, setTypeLabel

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

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

ZERO_LENGTH_UNTYPED

public static final UntypedAtomicValue ZERO_LENGTH_UNTYPED

Constructor Detail

UntypedAtomicValue

public UntypedAtomicValue(CharSequence value)

Constructor

Parameters:

value - the String value. Null is taken as equivalent to "".

Method Detail

copy

public AtomicValue copy(AtomicType typeLabel)

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

Overrides:

copy in class StringValue

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()

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.

Overrides:

getPrimitiveType in class StringValue

convertPrimitive

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

Convert to target data type

Overrides:

convertPrimitive in class StringValue

Parameters:

requiredType - type code of the required atomic type

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.

context - The conversion context to be used. This is required at present only when converting to xs:Name or similar types: it determines the NameChecker to be used.

Returns:

the result of the conversion, if successful. If unsuccessful, the value returned will be a ValidationErrorValue. The caller must check for this condition. No exception is thrown, instead the exception will be encapsulated within the ErrorValue.

toDouble

public DoubleValue toDouble()
                     throws ValidationException

Convert the value to a double, throwing an error if conversion is not possible

Throws:

ValidationException

compareTo

public int compareTo(AtomicValue other,
                     StringCollator collator,
                     XPathContext context)

Compare an untypedAtomic value with another value, using a given collator to perform any string comparisons. This works by converting the untypedAtomic value to the type of the other operand, which is the correct behavior for operators like "=" and "!=", but not for "eq" and "ne": in the latter case, the untypedAtomic value is converted to a string and this method is therefore not used.

Returns:

-1 if the this value is less than the other, 0 if they are equal, +1 if this value is greater.

Throws:

ClassCastException - if the value cannot be cast to the type of the other operand