| java.lang.Object
 net.sf.saxon.functions.ExecutableFunctionLibrary
| ExecutableFunctionLibrary | | public class ExecutableFunctionLibrary implements FunctionLibrary(Code) | | An ExecutableFunctionLibrary is a function library that contains definitions of functions for use at
run-time. Normally functions are bound at compile-time; however there are various situations in which
the information is needed dynamically, for example (a) to support the XSLT function-available() call
(in the pathological case where the argument is not known statically), (b) to allow functions to be
called from saxon:evaluate(), (c) to allow functions to be called from a debugging breakpoint.
The objects actually held in the ExecutableFunctionLibrary are UserFunctionCall objects that have been
prepared at compile time. These are function calls that do full dynamic type checking: that is, they
are prepared on the basis that the static types of the arguments are all "item()*", meaning that full
type checking is needed at run-time.
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| Method Summary | |
| public void | addFunction(UserFunction fn)
| | public Expression | bind(int nameCode, String uri, 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. | | 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.
a copy of this function library. | | public boolean | isAvailable(int fingerprint, String uri, String local, int arity)
Test whether a function with a given name and arity is available. |
| addFunction | | public void addFunction(UserFunction fn)(Code) | | Register a function with the function library
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| bind | | public Expression bind(int nameCode, String uri, String local, Expression[] staticArgs) throws XPathException(Code) | | 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.
Parameters:
nameCode - The namepool nameCode of the function name. The uri and local name are alsosupplied (redundantly) to avoid fetching them from the name pool.
Parameters:
uri - The URI of the function name
Parameters:
local - The local part of the function name
Parameters:
staticArgs - The expressions supplied statically in the function call. The intention isthat the static type of the arguments (obtainable via getItemType() and getCardinality() maybe used as part of the binding algorithm. An object representing the extension function to be called, if one is found;null if no extension function was found matching the required name and arity.
throws:
net.sf.saxon.trans.XPathException - if a function is found with the required name and arity, butthe implementation of the function cannot be loaded or used; or if an error occurswhile searching for the function; or if this function library "owns" the namespace containingthe function call, but no function was found. |
| copy | | public FunctionLibrary copy()(Code) | | 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.
a copy of this function library. This must be an instance of the original class. |
| isAvailable | | public boolean isAvailable(int fingerprint, String uri, String local, int arity)(Code) | | Test whether a function with a given name and arity is available. This supports
the function-available() function in XSLT.
Parameters:
uri - The URI of the function name
Parameters:
local - The local part of the function name
Parameters:
arity - The number of arguments. This is set to -1 in the case of the single-argumentfunction-available() function; in this case the method should return true if there is somematching extension function, regardless of its arity. |
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