Package net.sf.saxon.functions

This package provides implementations of all the core functions available for use in XPath expressions.

See:
Description

Interface Summary

ExtensionFunctionFactory	This is a marker interface representing an abstract superclass of JavaExtensionFunctionFactory and DotNetExtensionFunctionFactory.
FunctionLibrary	A FunctionLibrary handles the binding of function calls in XPath (or XQuery) expressions.
XSLTFunction	This is a marker interface used to identify functions that are defined in XSLT rather than in XPath

Class Summary

Adjust	This class implements the XPath 2.0 functions adjust-date-to-timezone(), adjust-time-timezone(), and adjust-dateTime-timezone().
Aggregate	This class implements the sum(), avg(), count() functions,
Available	This class supports the XSLT element-available and function-available functions.
BaseURI	This class supports the base-uri() functions in XPath 2.0
BooleanFn	This class supports the XPath functions boolean(), not(), true(), and false()
CodepointEqual	XPath 2.0 codepoint-equal() function.
CodepointsToString	This class supports the function codepoints-to-string
CollatingFunction	Abstract superclass for all functions that take an optional collation argument
Collection	Implement the fn:collection() function.
Compare	XSLT 2.0 compare() function
CompileTimeFunction	Abtract class representing a function call that is always rewritten at compile-time: it can never be executed
Component	This class supports the get_X_from_Y functions defined in XPath 2.0
Concat
ConstructorFunctionLibrary	The ConstructorFunctionLibrary represents the collection of constructor functions for atomic types.
Contains	This class implements the contains(), starts-with(), ends-with(), substring-before(), and substring-after() functions
Current	Implement the XSLT current() function
CurrentDateTime	This class implements the XPath 2.0 functions current-date(), current-time(), and current-dateTime(), as well as the function implicit-timezone().
CurrentGroup	Implements the XSLT functions current-group() and current-grouping-key()
Data	Implement XPath function fn:data()
DateTimeConstructor	This class supports the dateTime($date, $time) function
DeepEqual	XSLT 2.0 deep-equal() function.
DefaultCollation	Implement the XPath 2.0 default-collation() function
DistinctValues	The XPath 2.0 distinct-values() function
DistinctValues.DistinctIterator	Iterator class to return the distinct values in a sequence
Doc	Implement the fn:doc() function - a simplified form of the Document function
DocAvailable	Implement the fn:doc-available() function
Document	Implements the XSLT document() function
Error	Implement XPath function fn:error()
EscapeURI	This class supports the functions encode-for-uri() and iri-to-uri()
Evaluate	This class implements the saxon:evaluate(), saxon:expression(), and saxon:eval() extension functions, which are specially-recognized by the system because they need access to parts of the static context
Evaluate.PreparedExpression	Inner class PreparedExpression represents a compiled XPath expression together with the standard variables $p1 ..
ExecutableFunctionLibrary	An ExecutableFunctionLibrary is a function library that contains definitions of functions for use at run-time.
Existence	Implement the exists() and empty() functions
ExtensionFunctionCall	This class acts as a container for an extension function defined to call a method in a user-defined class.
Extensions	This class implements functions that are supplied as standard with SAXON, but which are not defined in the XSLT or XPath specifications.
ForceCase	This class implements the upper-case() and lower-case() functions
FormatDate	Implement the format-date() function in XSLT 2.0
FormatNumber	XSLT 2.0 implementation of format-number() function - removes the dependence on the JDK.
FunctionLibraryList	A FunctionLibraryList is a list of FunctionLibraries.
Id	The XPath id() function XPath 2.0 version: accepts any sequence as the first parameter; each item in the sequence is taken as an IDREFS value, that is, a space-separated list of ID values.
Idref
IndexOf	The XPath 2.0 index-of() function
IndexOf.IndexIterator	Iterator to return the index positions of selected items in a sequence
InScopePrefixes	This class supports fuctions get-in-scope-prefixes()
Insert	The XPath 2.0 insert-before() function
Insert.InsertIterator
IsWholeNumber	This class implements the saxon:is-whole-number() extension function, which is specially-recognized by the system because calls are generated by the optimizer.
ItemAt	Implements the saxon:item-at() function.
JavaExtensionFunctionFactory	This class acts as a factory for creating expressions that call Java extension functions.
JavaExtensionLibrary	The JavaExtensionLibrary is a FunctionLibrary that binds XPath function calls to calls on Java methods (or constructors, or fields).
KeyFn
Lang
Last	Implement the XPath 2.0 function last()
Matches	This class implements the matches() function for regular expression matching
Minimax	This class implements the min() and max() functions
NamePart	This class supports the name(), local-name(), and namespace-uri() functions from XPath 1.0, and also the XSLT generate-id() function
NamespaceForPrefix	This class supports the function namespace-uri-for-prefix()
Nilled	This class supports the nilled() function
NormalizeSpace	Implement the XPath normalize-space() function
NormalizeUnicode	Implement the XPath normalize-unicode() function
NumberFn	Implements the XPath number() function.
Parse	This class implements the saxon:parse() extension function, which is specially-recognized by the system because it needs access to parts of the static context
Position
QNameFn	This class supports the fn:QName() function (previously named fn:expanded-QName())
RegexGroup
Remove	The XPath 2.0 remove() function
Remove.RemoveIterator	An implementation of SequenceIterator that returns all items except the one at a specified position.
Replace	This class implements the replace() function for replacing substrings that match a regular expression
ResolveQName	This class supports the resolve-QName function in XPath 2.0
ResolveURI	This class supports the resolve-uri() functions in XPath 2.0
Reverse	Implement XPath function fn:reverse()
Root	Implement the XPath 2.0 root() function
Rounding	This class supports the ceiling(), floor(), round(), and round-to-half-even() functions, and also the abs() function
Serialize	This class implements the saxon:serialize() extension function, which is specially-recognized by the system because it needs access to parts of the static context
StandardCollectionURIResolver	This class implements the default collection URI Resolver.
StandardFunction	This class contains static data tables defining the properties of standard functions.
StandardFunction.Entry	An entry in the table describing the properties of a function
StaticBaseURI	This class supports the static-base-uri() function in XPath 2.0.
StringFn	Implement XPath function string()
StringJoin	xf:string-join(string* $sequence, string $separator)
StringLength	Implement the XPath string-length() function
StringToCodepoints	This class supports the function string-to-codepoints()
Subsequence	Implements the XPath 2.0 subsequence() function
Substring	This class implements the XPath substring() function
SystemFunction	Abstract superclass for system-defined and user-defined functions
SystemFunctionLibrary	The SystemFunctionLibrary represents the collection of functions in the fn: namespace.
SystemProperty	Implementation of the XSLT system-property() function
Tokenize	This class implements the tokenize() function for regular expression matching.
Trace	This class supports the XPath 2.0 function trace().
Translate	Implement the XPath translate() function
TreatFn	This class supports the XPath 2.0 functions exactly-one(), one-or-more(), zero-or-one().
Unordered	XPath 2.0 unordered() function
UnparsedEntity	Implements the unparsed-entity-uri() function defined in XSLT 1.0 and the unparsed-entity-public-id() function defined in XSLT 2.0
UnparsedText
URIQueryParameters	A set of query parameters on a URI passed to the collection() or document() function
URIQueryParameters.RegexFilter
VendorFunctionLibrary	The VendorFunctionLibrary represents specially-recognized functions in the Saxon namespace.

Package net.sf.saxon.functions Description

This package provides implementations of all the core functions available for use in XPath expressions. This includes all the functions defined in the XPath 2.0 Functions and Operators specification, as well as the additional functions defined for use in XSLT. The package also includes Saxon extension functions. Most of these are in a single class Extensions, but some of the more complex functions are in their own classes, for example Evaluate implements saxon:evaluate().

There is one class for group of closely-related functions. These all inherit from the class net.sf.saxon.expr.Function. The class StandardFunction is used to map a function name to its implementation; it contains tables of information describing the signature of each function, so that the type-checking code is completely generic.

The package also contains machinery for defining user extension functions. A collection of functions is represented by a FunctionLibrary object. There are several standard function libraries available, covering core functions, Saxon extension functions constructor functions, and user extension functions: each category is covered by a subclass of FunctionLibrary, and there is also a FunctionLibraryList that represents the total collection of functions in these individual libraries. The JavaExtensionLibrary contains the logic for binding Java extension functions given their name and arity and the types of their arguments. The class ExtensionFunctionCall contains the run-time logic for converting XPath values to the required Java types, and for converting the result back to an XPath value.

These classes, although public, will not normally be used directly by user-written Java applications.

Michael H. Kay
Saxonica Limited
9 February 2005