net.sf.saxon.functions

Class ConstructorFunctionLibrary

public class ConstructorFunctionLibrary extends Object implements FunctionLibrary

The ConstructorFunctionLibrary represents the collection of constructor functions for atomic types. These are provided for the built-in types such as xs:integer and xs:date, and also for user-defined atomic types.
Constructor Summary
ConstructorFunctionLibrary(Configuration config)
Create a SystemFunctionLibrary
Method Summary
Expressionbind(int nameCode, String uri, String localName, Expression[] arguments)
Bind an extension function, given the URI and local parts of the function name, and the list of expressions supplied as arguments.
FunctionLibrarycopy()
This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows new functions to be added, then additions to this copy will not affect the original, or vice versa.
booleanisAvailable(int fingerprint, String uri, String local, int arity)
Test whether a system function with a given name and arity is available.

Constructor Detail

ConstructorFunctionLibrary

public ConstructorFunctionLibrary(Configuration config)
Create a SystemFunctionLibrary

Parameters: config the Configuration

Method Detail

bind

public Expression bind(int nameCode, String uri, String localName, Expression[] arguments)
Bind an extension function, given the URI and local parts of the function name, and the list of expressions supplied as arguments. This method is called at compile time.

Parameters: uri The URI of the function name localName The local part of the function name arguments The expressions supplied statically in the function call. The intention is that the static type of the arguments (obtainable via getItemType() and getCardinality() may be used as part of the binding algorithm.

Returns: An object representing the extension function to be called, if one is found; null if no extension function was found matching the required name and arity.

Throws: net.sf.saxon.trans.XPathException if a function is found with the required name and arity, but the implementation of the function cannot be loaded or used; or if an error occurs while searching for the function; or if this function library "owns" the namespace containing the function call, but no function was found.

copy

public FunctionLibrary copy()
This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows new functions to be added, then additions to this copy will not affect the original, or vice versa.

Returns: a copy of this function library. This must be an instance of the original class.

isAvailable

public boolean isAvailable(int fingerprint, String uri, String local, int arity)
Test whether a system function with a given name and arity is available. This supports the function-available() function in XSLT. This method may be called either at compile time or at run time.

Parameters: uri The URI of the function name local The local part of the function name arity The number of arguments. This is set to -1 in the case of the single-argument function-available() function; in this case the method should return true if there is some matching extension function, regardless of its arity.