Class Component

    • Constructor Detail

      • Component

        public Component()
    • Method Detail

      • simplify

        public Expression simplify​(ExpressionVisitor visitor)
                            throws XPathException
        Description copied from class: FunctionCall
        Simplify the function call. Default method is to simplify each of the supplied arguments and evaluate the function if all are now known.
        Overrides:
        simplify in class FunctionCall
        Parameters:
        visitor - an expression visitor
        Returns:
        the simplified expression
        Throws:
        XPathException - if an error is discovered during expression rewriting
      • setDetails

        public void setDetails​(StandardFunction.Entry entry)
        Set the details of this type of function
        Overrides:
        setDetails in class SystemFunction
        Parameters:
        entry - information giving details of the function signature
      • getIntegerBounds

        public IntegerValue[] getIntegerBounds()
        For an expression that returns an integer or a sequence of integers, get a lower and upper bound on the values of the integers that may be returned, from static analysis. The default implementation returns null, meaning "unknown" or "not applicable". Other implementations return an array of two IntegerValue objects, representing the lower and upper bounds respectively. The values UNBOUNDED_LOWER and UNBOUNDED_UPPER are used by convention to indicate that the value may be arbitrarily large. The values MAX_STRING_LENGTH and MAX_SEQUENCE_LENGTH are used to indicate values limited by the size of a string or the size of a sequence.
        Overrides:
        getIntegerBounds in class Expression
        Returns:
        the lower and upper bounds of integer values in the result, or null to indicate unknown or not applicable.
      • getRequiredComponent

        public int getRequiredComponent()
        Get the required component
      • getRequiredComponentAsString

        public java.lang.String getRequiredComponentAsString()
        Get the required component name as a string
      • evaluateItem

        public Item evaluateItem​(XPathContext context)
                          throws XPathException
        Evaluate the expression
        Overrides:
        evaluateItem in class Expression
        Parameters:
        context - The context in which the expression is to be evaluated
        Returns:
        the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence
        Throws:
        XPathException - if any dynamic error occurs evaluating the expression
      • copy

        public Expression copy()
        Copy an expression. This makes a deep copy.
        Overrides:
        copy in class SystemFunction
        Returns:
        the copy of the original expression