Examples of net.sf.saxon.functions.FunctionLibrary.bind()

• net.sf.saxon.functions.FunctionLibrary.bind()
  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. @param functionName the QName of the function being called @param staticArgs The expressions supplied statically in arguments to the function call.The length of this array represents the arity of the function. The intention is that the static type of the arguments (obtainable via getItemType() and getCardinality()) may be used as part of the binding algorithm. In some cases it may be possible for the function to be pre-evaluated at compile time, for example if these expressions are all constant values.

  The conventions of the XPath language demand that the results of a function depend only on the values of the expressions supplied as arguments, and not on the form of those expressions. For example, the result of f(4) is expected to be the same as f(2+2). The actual expression is supplied here to enable the binding mechanism to select the most efficient possible implementation (including compile-time pre-evaluation where appropriate). @param env The static context of the function call @return An object representing the function to be called, if one is found;null if no 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 occurs while searching for the function.