public class SystemFunctionLibrary extends java.lang.Object implements FunctionLibrary
?????? | ????? |
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static int |
FULL_XSLT |
static int |
USE_WHEN |
static int |
XPATH_ONLY |
?????? | ????? |
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Expression |
bind(StructuredQName functionName,
Expression[] staticArgs,
StaticContext env)
Bind an extension function, given the URI and local parts of the function name,
and the list of expressions supplied as arguments.
|
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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static SystemFunctionLibrary |
getSystemFunctionLibrary(int functionSet)
Factory method to create or get a SystemFunctionLibrary
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boolean |
isAvailable(StructuredQName functionName,
int arity)
Test whether a system function with a given name and arity is available.
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public static final int XPATH_ONLY
public static final int FULL_XSLT
public static final int USE_WHEN
public static SystemFunctionLibrary getSystemFunctionLibrary(int functionSet)
functionSet
- determines the set of functions allowed. One of
XPATH_ONLY
, FULL_XSLT
, USE_WHEN
public boolean isAvailable(StructuredQName functionName, int arity)
isAvailable
???? FunctionLibrary
functionName
- the name of the function being testedarity
- 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
???? FunctionLibrary
functionName
- the name of the function to be boundstaticArgs
- 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
- 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.public FunctionLibrary copy()
copy
???? FunctionLibrary