Class PositionRange


  • class PositionRange
    extends Expression
    PositionRange: a boolean expression that tests whether the position() is within a certain range. This expression can occur in any context but it is optimized when it appears as a predicate (see FilterEnumerator)
    • Constructor Detail

      • PositionRange

        public PositionRange​(int min,
                             int max)
        Create a position range
    • Method Detail

      • evaluate

        public Value evaluate​(Context c)
                       throws XPathException
        Evaluate the expression in a given context
        Specified by:
        evaluate in class Expression
        Parameters:
        c - the given context for evaluation
        Returns:
        a BooleanValue representing the result of the numeric comparison of the two operands
        Throws:
        XPathException
      • evaluateAsBoolean

        public boolean evaluateAsBoolean​(Context c)
                                  throws XPathException
        Evaluate the expression in a given context
        Overrides:
        evaluateAsBoolean in class Expression
        Parameters:
        c - the given context for evaluation
        Returns:
        a boolean representing the result of the numeric comparison of the two operands
        Throws:
        XPathException
      • getDataType

        public int getDataType()
        Determine the data type of the expression
        Specified by:
        getDataType in class Expression
        Returns:
        Value.BOOLEAN
      • reduce

        public Expression reduce​(int dependencies,
                                 Context context)
                          throws XPathException
        Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
        Specified by:
        reduce in class Expression
        Parameters:
        dependencies - The dependencies to be removed
        context - The context to be used for the partial evaluation
        Returns:
        a new expression that does not have any of the specified dependencies
        Throws:
        XPathException
      • getMinPosition

        protected int getMinPosition()
        Get the minimum position
      • getMaxPosition

        protected int getMaxPosition()
        Get the maximum position
      • display

        public void display​(int level)
        Diagnostic print of expression structure
        Specified by:
        display in class Expression