net.sf.saxon.xpath
Class XPathFunctionLibrary
java.lang.Object
net.sf.saxon.xpath.XPathFunctionLibrary
- FunctionLibrary, Serializable
public class XPathFunctionLibrary
extends java.lang.Object
The XPathFunctionLibrary is a FunctionLibrary that supports binding of XPath function
calls to instances of the JAXP XPathFunction interface returned by an XPathFunctionResolver.
XPathFunctionLibrary
public XPathFunctionLibrary()
Construct a XPathFunctionLibrary
bind
public Expression bind(StructuredQName functionName,
Expression[] staticArgs,
StaticContext env)
throws XPathException
Bind a 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.
- bind in interface FunctionLibrary
functionName
- staticArgs
- 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
-
- An object representing the extension function to be called, if one is found;
null if no extension function was found matching the required name, arity, or signature.
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.
- copy in interface FunctionLibrary
- a copy of this function library. This must be an instance of the original class.
getXPathFunctionResolver
public XPathFunctionResolver getXPathFunctionResolver()
Get the resolver
- the XPathFunctionResolver wrapped by this FunctionLibrary
isAvailable
public boolean isAvailable(StructuredQName functionName,
int arity)
Test whether an XPath function with a given name and arity is available. This supports
the function-available() function in XSLT. It is thus never used, and always returns false
- isAvailable in interface FunctionLibrary
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
setXPathFunctionResolver
public void setXPathFunctionResolver(XPathFunctionResolver resolver)
Set the resolver
resolver
- The XPathFunctionResolver wrapped by this FunctionLibrary