Class FunctionAvailable

All Implemented Interfaces:
Callable, FunctionItem, GroundedValue, Item, Sequence

public class FunctionAvailable extends SystemFunction
This class implements the XSLT function-available functions.
  • Constructor Details

    • FunctionAvailable

      public FunctionAvailable()
  • 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
    • makeOptimizedFunctionCall

      public Expression makeOptimizedFunctionCall(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo, Expression... arguments) throws XPathException
      Allow the function to create an optimized call based on the values of the actual arguments
      Overrides:
      makeOptimizedFunctionCall in class SystemFunction
      Parameters:
      visitor - the expression visitor
      contextInfo - information about the context item
      arguments - the supplied arguments to the function call
      Returns:
      either a function call on this function, or an expression that delivers the same result, or null indicating that no optimization has taken place
      Throws:
      XPathException - if an error is detected
    • call

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