Package net.sf.saxon.functions

Class HeadFn

java.lang.Object
net.sf.saxon.functions.AbstractFunction
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.HeadFn
All Implemented Interfaces:
Callable, FunctionItem, GroundedValue, Item, Sequence
public class HeadFn extends SystemFunction
This class implements the function fn:head(), which is a standard function in XPath 3.0

  • Constructor Details

    • HeadFn

      public HeadFn()

  • Method Details

    • makeFunctionCall

      public Expression makeFunctionCall(Expression[] arguments)
      Description copied from class: SystemFunction
      Make an expression that either calls this function, or that is equivalent to a call on this function
      Overrides:
      makeFunctionCall in class SystemFunction
      Parameters:
      arguments - the supplied arguments to the function call
      Returns:
      either a function call on this function, or an expression that delivers the same result

    • call

      public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException
      Evaluate the expression
      Parameters:
      context - the dynamic evaluation context
      arguments - the values of the arguments, supplied as Sequences
      Returns:
      the result of the evaluation, in the form of a Sequence
      Throws:
      XPathException - if a dynamic error occurs during the evaluation of the expression