Package net.sf.saxon.functions
Class ConstructorFunctionLibrary
java.lang.Object
net.sf.saxon.functions.ConstructorFunctionLibrary
- All Implemented Interfaces:
Serializable
,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.
- See Also:
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Constructor Summary
ConstructorsConstructorDescriptionCreate a SystemFunctionLibrary -
Method Summary
Modifier and TypeMethodDescriptionbind
(StructuredQName functionName, Expression[] arguments, StaticContext env) Bind an extension function, given the URI and local parts of the function name, and the list of expressions supplied as arguments.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.boolean
isAvailable
(StructuredQName functionName, int arity) Test whether a system function with a given name and arity is available.
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Constructor Details
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ConstructorFunctionLibrary
Create a SystemFunctionLibrary- Parameters:
config
- the Configuration
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Method Details
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isAvailable
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.- Specified by:
isAvailable
in interfaceFunctionLibrary
- Parameters:
functionName
-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- Returns:
- true if a function of this name and arity is available for calling.
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bind
public Expression bind(StructuredQName functionName, Expression[] arguments, StaticContext env) throws XPathException 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.- Specified by:
bind
in interfaceFunctionLibrary
- Parameters:
functionName
-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.env
-- 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:
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.
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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.- Specified by:
copy
in interfaceFunctionLibrary
- Returns:
- a copy of this function library. This must be an instance of the original class.
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