Class Subsequence_2

    • Constructor Detail

      • Subsequence_2

        public Subsequence_2()
    • Method Detail

      • getSpecialProperties

        public int getSpecialProperties​(Expression[] arguments)
        Get the static properties of this expression (other than its type). The result is bit-significant. These properties are used for optimizations. In general, if property bit is set, it is true, but if it is unset, the value is unknown.
        Overrides:
        getSpecialProperties in class SystemFunction
        Parameters:
        arguments - the actual arguments to the function call
      • getCardinality

        public int getCardinality​(Expression[] arguments)
        Determine the cardinality of the function.
        Overrides:
        getCardinality in class SystemFunction
        Parameters:
        arguments - the actual arguments supplied
        Returns:
        the most precise available cardinality that the function will return
      • call

        public Sequence call​(XPathContext context,
                             Sequence[] arguments)
                      throws XPathException
        Call the function
        Specified by:
        call in interface Callable
        Specified by:
        call in interface Function
        Parameters:
        context - the dynamic evaluation context
        arguments - the values of the arguments, supplied as Sequences.

        Generally it is advisable, if calling iterate() to process a supplied sequence, to call it only once; if the value is required more than once, it should first be converted to a GroundedValue by calling the utility methd SequenceTool.toGroundedValue().

        If the expected value is a single item, the item should be obtained by calling Sequence.head(): it cannot be assumed that the item will be passed as an instance of Item or AtomicValue.

        It is the caller's responsibility to perform any type conversions required to convert arguments to the type expected by the callee. An exception is where this Callable is explicitly an argument-converting wrapper around the original Callable.

        Returns:
        the result of the function call
        Throws:
        XPathException - if a dynamic error occurs
      • makeFunctionCall

        public Expression makeFunctionCall​(Expression[] arguments)
        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
      • getStreamerName

        public java.lang.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.