See: Description
Interface | Description |
---|---|
ExternalObject<T> |
An item that wraps an external (Java or .NET) object
|
Class | Description |
---|---|
AnyURIValue |
An XPath value of type xs:anyURI.
|
AtomicValue |
The AtomicValue class corresponds to the concept of an atomic value in the
XPath 2.0 data model.
|
Base64BinaryValue |
A value of type xs:base64Binary
|
BigDecimalValue |
An implementation class for decimal values other than integers
|
BigDecimalValue.DecimalComparable |
A Comparable that performs comparison of a DecimalValue either with another
DecimalValue or with some other representation of an XPath numeric value
|
BigIntegerValue |
An integer value: note this is a subtype of decimal in XML Schema, not a primitive type.
|
BigIntegerValue.BigIntegerComparable |
A Comparable that performs comparison of BigInteger values either with other
BigInteger values or with other representations of XPath numeric values
|
BooleanValue |
A boolean XPath value
|
CalendarValue |
Abstract superclass for Date, Time, and DateTime.
|
Cardinality |
This class contains static methods to manipulate the cardinality
property of a type.
|
Closure |
A Closure represents a value that has not yet been evaluated: the value is represented
by an expression, together with saved values of all the context variables that the
expression depends on.
|
DateTimeValue |
A value of type
xs:dateTime . |
DateValue |
A value of type Date.
|
DayTimeDurationValue |
A value of type xs:dayTimeDuration.
|
DecimalValue |
Abstract class representing the XDM type xs:decimal.
|
DoubleValue |
A numeric (double precision floating point) value
|
DurationValue |
A value of type xs:duration
|
EmptySequence<T extends Item<?>> |
An EmptySequence object represents a sequence containing no members.
|
FloatingPointConverter |
This is a utility class that handles formatting of numbers as strings.
|
FloatValue |
A numeric (single precision floating point) value
|
GDateValue |
Abstract superclass for the primitive types containing date components: xs:date, xs:gYear,
xs:gYearMonth, xs:gMonth, xs:gMonthDay, xs:gDay
|
GDayValue |
Implementation of the xs:gDay data type
|
GMonthDayValue |
Implementation of the xs:gYear data type
|
GMonthValue |
Implementation of the xs:gMonth data type
|
GYearMonthValue |
Implementation of the xs:gYearMonth data type
|
GYearValue |
Implementation of the xs:gYear data type
|
HexBinaryValue |
A value of type xs:hexBinary
|
Int64Value |
An integer value: note this is a subtype of decimal in XML Schema, not a primitive type.
|
Int64Value.Int64Comparable |
A Comparable that performs comparison of an Int64Value either with another
Int64Value or with some other representation of an XPath numeric value
|
IntegerRange |
This class represents a sequence of consecutive ascending integers, for example 1 to 50.
|
IntegerValue |
This class represents the XPath built-in type xs:integer.
|
MemoClosure |
A MemoClosure represents a value that has not yet been evaluated: the value is represented
by an expression, together with saved values of all the context variables that the
expression depends on.
|
NestedIntegerValue |
This class represents a dot-separated sequence of numbers such as 1.12.5, typically
used as a software version number.
|
NotationValue |
An xs:NOTATION value.
|
NumericValue |
NumericValue is an abstract superclass for IntegerValue, DecimalValue,
FloatValue, and DoubleValue
|
ObjectValue<T> |
An XPath value that encapsulates a Java object.
|
QNameValue |
A QName value.
|
QualifiedNameValue |
A qualified name: this is an abstract superclass for QNameValue and NotationValue, representing the
XPath primitive types xs:QName and xs:NOTATION respectively
|
SaxonDuration |
Saxon implementation of the JAXP class javax.xml.datatype.Duration.
|
SaxonXMLGregorianCalendar |
Saxon implementation of the JAXP class javax.xml.datatype.XMLGregorianCalendar.
|
SequenceExtent<T extends Item<?>> |
A sequence value implemented extensionally.
|
SequenceSlice<T extends Item<?>> |
A sequence value implemented extensionally.
|
SequenceType |
SequenceType: a sequence type consists of a primary type, which indicates the type of item,
and a cardinality, which indicates the number of occurrences permitted.
|
SingletonClosure |
A SingletonClosure represents a value that has not yet been evaluated: the value is represented
by an expression, together with saved values of all the context variables that the
expression depends on.
|
StringToDouble11 |
Convert a string to a double using the rules of XML Schema 1.1
|
StringValue |
An atomic value of type xs:string.
|
StringValue.CharacterIterator |
CharacterIterator is used to iterate over the characters in a string,
returning them as integers representing the Unicode code-point.
|
StringValue.UnicodeCharacterIterator | |
TextFragmentValue |
This class represents a temporary tree whose root document node owns a single text node.
|
TimeValue |
A value of type xs:time
|
UntypedAtomicValue |
An Untyped Atomic value.
|
Whitespace |
This class provides helper methods and constants for handling whitespace
|
Whitespace.Tokenizer |
An iterator that splits a string on whitespace boundaries, corresponding to the XPath 3.1 function tokenize#1
|
YearMonthDurationValue |
A value of type xs:yearMonthDuration.
|
This package provides classes representing XPath values (that is, the results of an expression). There are different classes for different types of value.
The principal class is:
Value:
This represents the result of evaluating an expression. But a Value is also an expression in its
own right, reflecting the fact that literal values can be used syntactically wherever expressions
can be used. AtomicValue
is a subclass of Value
that represents an atomic value: this in turn has subclasses for the different built-in data types:
StringValue, NumericValue, BooleanValue, DateValue, and so on.
There are two classes used to represent integer values: IntegerValue
for integers that
fit comfortably in 64 bits, and BigIntegerValue
for anything longer. Built-in subtypes
of xs:integer, such as xs:int
and xs:short
, are always represented using
an IntegerValue
, except for xs:unsignedLong
, which uses a BigIntegerValue
.
In general a value is a sequence. A sequence that is instantiated in memory is represented by a
SequenceExtent
object. The code tries to pipeline execution so that a SequenceExtent
is created as rarely as possible.
When an expression is evaluated lazily, the result is a Closure
. A Closure contains the original
expression, and a copy of the run-time context at the time evaluation was requested: that is, all the local
variables
and other information that it depends on, such as the context item. There are two kinds of Closure, and the system
decides at compile time which to use. An ordinary Closure re-evaluates the expression every time the value is
referenced;
this is used only when the compiler decides that the value is likely to be referenced only once. A MemoClosure
remembers
the value the first time it is needed, so that subsequent references do not cause repeated evaluation of the
expression.
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