Package net.sf.saxon.functions


package net.sf.saxon.functions

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

  • Class
    Description
    This class implements the XPath 2.0 functions adjust-date-to-timezone(), adjust-time-timezone(), and adjust-dateTime-timezone().
    This abstract class provides functionality common to the sum(), avg(), count(), exists(), and empty() functions.
    This class supports the XSLT element-available, function-available, and type-available functions.
    Implementation of the fn:avg function
    This class supports the base-uri() function in XPath 2.0
    This class supports the XPath functions boolean(), not(), true(), and false()
    XPath 2.0 codepoint-equal() function.
    This class supports the function codepoints-to-string
    Abstract superclass for all functions that take an optional collation argument
    Implement the fn:collection() function.
    XSLT 2.0 compare() function
    Abtract class representing a function call that is always rewritten at compile-time: it can never be executed
    This class supports the get_X_from_Y functions defined in XPath 2.0
    Implementation of the fn:concat() function
    The ConstructorFunctionLibrary represents the collection of constructor functions for atomic types.
    Implements the fn:contains() function
    Implementation of the fn:count function
    Implement the XSLT current() function
    This class implements the XPath 2.0 functions current-date(), current-time(), and current-dateTime(), as well as the function implicit-timezone().
    Implements the XSLT function current-group()
    Implements the XSLT function current-grouping-key()
    Implement XPath function fn:data()
    This class supports the dateTime($date, $time) function
    XSLT 2.0 deep-equal() function.
    Implement the XPath 2.0 default-collation() function
    The XPath 2.0 distinct-values() function
    Iterator class to return the distinct values in a sequence
    Implement the fn:doc() function - a simplified form of the Document function
    Implement the fn:doc-available() function
     
    Implements the XSLT document() function
    This class supports the document-uri() function
    This class supports the XSLT element-available and function-available functions.
    Implementation of the fn:exists function
    Implements the fn:ends-with() function
    Implement XPath function fn:error()
    This class supports the functions encode-for-uri() and iri-to-uri()
    An ExecutableFunctionLibrary is a function library that contains definitions of functions for use at run-time.
    Implementation of the fn:exists function
    This is a marker interface representing an abstract superclass of JavaExtensionFunctionFactory and DotNetExtensionFunctionFactory.
    This class implements the upper-case() and lower-case() functions
    Implement the format-date(), format-time(), and format-dateTime() functions in XSLT 2.0 and XQuery 1.1.
    XSLT 2.0 implementation of format-number() function - removes the dependence on the JDK.
    This class implements the function function-arity(), which is a standard function in XQuery 1.1
    This class supports the XSLT element-available and function-available functions.
    A FunctionLibrary handles the binding of function calls in XPath (or XQuery) expressions.
    A FunctionLibraryList is a list of FunctionLibraries.
    This class implements the function function-name(), which is a standard function in XQuery 1.1
    This class supports the generate-id() function
    The XPath id() or element-with-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.
     
    The XPath 2.0 index-of() function
    Iterator to return the index positions of selected items in a sequence
    This class supports fuctions get-in-scope-prefixes()
    The XPath 2.0 insert-before() function
    Insertion iterator.
    Expression representing a call to a user-written extension function implemented as a subtype of ExtensionFunctionCall
    A library of integrated function calls, that is, user-written extension functions implemented as instances of the class IntegratedFunction.
    This class implements the saxon:is-whole-number() extension function, which is specially-recognized by the system because calls are generated by the optimizer.
    Implements the saxon:item-at() function.
     
    Mapping class to filter nodes that have the origin node as an ancestor-or-self
     
    Implement the XPath 2.0 function last()
    This class supports the local-name() function
    This class implements the matches() function for regular expression matching
    This class implements the min() and max() functions
    This class supports the name() function
    This class supports the function namespace-uri-for-prefix()
    This class supports the namespace-uri() function
    This class supports the nilled() function
    This class supports the name(), local-name(), and namespace-uri() functions from XPath 1.0, and also the XSLT generate-id() function
    Implement the XPath normalize-space() function
    Implement the XPath normalize-unicode() function
    This class supports the XPath functions boolean(), not(), true(), and false()
    Implements the XPath number() function.
     
    Implements the fn:put() function in XQuery Update 1.0.
    This class supports the fn:QName() function (previously named fn:expanded-QName())
     
    The XPath 2.0 remove() function
    An implementation of SequenceIterator that returns all items except the one at a specified position.
    This class implements the replace() function for replacing substrings that match a regular expression
    This class supports the resolve-QName function in XPath 2.0
    This class supports the resolve-uri() functions in XPath 2.0
    Implement XPath function fn:reverse()
    Implement the XPath 2.0 root() function
    This class supports the ceiling(), floor(), round(), and round-to-half-even() functions, and also the abs() function
    This class contains static data tables defining the properties of standard functions.
    An entry in the table describing the properties of a function
    Implements the fn:starts-with() function
    This class supports the static-base-uri() function in XPath 2.0.
    Implement XPath function string()
    xf:string-join(string* $sequence, string $separator)
    Implement the XPath string-length() function
    This class supports the function string-to-codepoints()
    Implements the XPath 2.0 subsequence() function
    This class implements the XPath substring() function
    Implements the fn:substring-after() function
    Implements the fn:substring-before() function
    Implementation of the fn:sum function
    Abstract superclass for system-defined and user-defined functions
    The SystemFunctionLibrary represents the collection of functions in the fn: namespace.
    Implementation of the XSLT system-property() function
    This class implements the tokenize() function for regular expression matching.
    This class supports the XPath 2.0 function trace().
    Implement the XPath translate() function
    This class supports the XPath 2.0 functions exactly-one(), one-or-more(), zero-or-one().
    This class supports the XSLT element-available and function-available functions.
    XPath 2.0 unordered() function
    Implements the unparsed-entity-uri() function defined in XSLT 1.0 and the unparsed-entity-public-id() function defined in XSLT 2.0
     
     
     
    Implement the fn:uri-collection() function (new in XQuery 3.0/XSLT 3.0).
    A set of query parameters on a URI passed to the collection() or document() function
     
    The VendorFunctionLibrary represents specially-recognized functions in the Saxon namespace.