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java.lang.Object net.sf.saxon.xpath.XPathFunctionLibrary
public class XPathFunctionLibrary
The XPathFunctionLibrary is a FunctionLibrary that supports binding of XPath function calls to instances of the JAXP XPathFunction interface returned by an XPathFunctionResolver.
Constructor Summary | |
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XPathFunctionLibrary()
Construct a XPathFunctionLibrary |
Method Summary | |
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Expression |
bind(StructuredQName functionName,
Expression[] staticArgs,
StaticContext env,
Container container)
Bind a 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. |
SequenceType[] |
getFunctionSignature(StructuredQName functionName,
int arity)
Test whether a function with a given name and arity is available; if so, return its signature. |
XPathFunctionResolver |
getXPathFunctionResolver()
Get the resolver |
void |
setXPathFunctionResolver(XPathFunctionResolver resolver)
Set the resolver |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public XPathFunctionLibrary()
Method Detail |
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public void setXPathFunctionResolver(XPathFunctionResolver resolver)
resolver
- The XPathFunctionResolver wrapped by this FunctionLibrarypublic XPathFunctionResolver getXPathFunctionResolver()
public SequenceType[] getFunctionSignature(StructuredQName functionName, int arity)
This method may be called either at compile time or at run time. If the function library is to be used only in an XQuery or free-standing XPath environment, this method may throw an UnsupportedOperationException.
getFunctionSignature
in interface FunctionLibrary
functionName
- the qualified name of the function being calledarity
- 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
function of this name available for calling.
public Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env, Container container) throws XPathException
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
- container
-
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.public FunctionLibrary copy()
copy
in interface FunctionLibrary
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