net.sf.saxon.functions
public class ExecutableFunctionLibrary extends java.lang.Object implements FunctionLibrary
Constructor and Description |
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ExecutableFunctionLibrary(Configuration config)
Create the ExecutableFunctionLibrary
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Modifier and Type | Method and Description |
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void |
addFunction(UserFunction fn)
Register a function with the function library
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Expression |
bind(StructuredQName functionName,
Expression[] staticArgs,
StaticContext env)
Bind a function, given the URI and local parts of the function name,
and the list of expressions supplied as arguments.
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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.
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boolean |
isAvailable(StructuredQName functionName,
int arity)
Test whether a function with a given name and arity is available.
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java.util.Iterator |
iterateFunctions()
Iterate over all the functions defined in this function library.
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public ExecutableFunctionLibrary(Configuration config)
config
- the Saxon configurationpublic void addFunction(UserFunction fn)
fn
- the function to be registeredpublic boolean isAvailable(StructuredQName functionName, int arity)
isAvailable
in interface FunctionLibrary
functionName
- the name of the function being soughtarity
- 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 somepublic Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env) throws XPathException
bind
in interface FunctionLibrary
functionName
- The name of the function to be calledstaticArgs
- 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
- the static evaluation contextXPathException
- 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.public FunctionLibrary copy()
copy
in interface FunctionLibrary
public java.util.Iterator iterateFunctions()
UserFunction
UserFunction
objects representing
the user-defined functions in a stylesheet or query