Class Reverse

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

public class Reverse extends SystemFunction
Implement XPath function fn:reverse()
  • Constructor Details

    • Reverse

      public Reverse()
  • Method Details

    • getSpecialProperties

      public int getSpecialProperties(Expression[] arguments)
      Description copied from class: SystemFunction
      Determine the special properties of this function. The general rule is that a system function call is non-creative unless more details are defined in a subclass.
      Overrides:
      getSpecialProperties in class SystemFunction
      Parameters:
      arguments - the actual arguments supplied in a call to the function
    • getReverseIterator

      public static <T extends Item> SequenceIterator getReverseIterator(SequenceIterator forwards) throws XPathException
      Throws:
      XPathException
    • call

      public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException
      Description copied from interface: Function
      Invoke the function
      Parameters:
      context - the XPath dynamic evaluation context
      arguments - the actual arguments to be supplied
      Returns:
      the result of invoking the function
      Throws:
      XPathException - if a dynamic error occurs within the function
    • 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. Note: modifying the contents of this array should not be attempted, it is likely to have no effect.
      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
    • getStreamerName

      public String getStreamerName()
      Description copied from class: SystemFunction
      Get a name that identifies the class that can be used to evaluate this function in streaming mode, that is, supplying one item or event at a time as it is delivered by the parser. Special streaming support is generally available in Saxon-EE for all system functions that take a sequence as their argument.
      Overrides:
      getStreamerName in class SystemFunction
      Returns:
      a name that identifies a class that supports streamed evaluation of this system function, or null if no such class is available. The mapping of names to classes is defined in the Saxon-EE class StreamerMap. In non-streaming Saxon editions (HE and PE) the method always returns null.