java.io.Serializable
, FunctionLibrary
public class ExecutableFunctionLibrary extends java.lang.Object implements FunctionLibrary
Constructor | Description |
---|---|
ExecutableFunctionLibrary(Configuration config) |
Modifier and Type | Method | Description |
---|---|---|
void |
addFunction(UserFunction fn) |
Register a function with the function library
|
Expression |
bind(int nameCode,
java.lang.String uri,
java.lang.String local,
Expression[] staticArgs) |
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.
|
boolean |
isAvailable(int fingerprint,
java.lang.String uri,
java.lang.String local,
int arity) |
Test whether a function with a given name and arity is available.
|
public ExecutableFunctionLibrary(Configuration config)
public void addFunction(UserFunction fn)
public boolean isAvailable(int fingerprint, java.lang.String uri, java.lang.String local, int arity)
isAvailable
in interface FunctionLibrary
uri
- The URI of the function namelocal
- The local part of the function namearity
- 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
matching extension function, regardless of its arity.fingerprint
- The namepool fingerprint of the function name. This must match the
uri and localName; the information is provided redundantly to avoid repeated lookups in the name pool.public Expression bind(int nameCode, java.lang.String uri, java.lang.String local, Expression[] staticArgs) throws XPathException
bind
in interface FunctionLibrary
nameCode
- The namepool nameCode of the function name. The uri and local name are also
supplied (redundantly) to avoid fetching them from the name pool.uri
- The URI of the function namelocal
- The local part of the function namestaticArgs
- 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.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
in interface FunctionLibrary