Class OrExpression

    • Constructor Detail

      • OrExpression

        public OrExpression​(Expression p1,
                            Expression p2)
        Construct a boolean OR expression
        Parameters:
        p1 - the first operand
        p2 - the second operand
    • Method Detail

      • optimize

        public Expression optimize​(ExpressionVisitor visitor,
                                   ExpressionVisitor.ContextItemType contextItemType)
                            throws XPathException
        Perform optimisation of an expression and its subexpressions.

        This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

        Overrides:
        optimize in class BooleanExpression
        Parameters:
        visitor - an expression visitor
        contextItemType - the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to Type.ITEM_TYPE
        Returns:
        the original expression, rewritten if appropriate to optimize execution
        Throws:
        XPathException - if an error is discovered during this phase (typically a type error)
      • copy

        public Expression copy()
        Copy an expression. This makes a deep copy.
        Specified by:
        copy in class Expression
        Returns:
        the copy of the original expression
      • negate

        public Expression negate()
        Return the negation of this boolean expression, that is, an expression that returns true when this expression returns false, and vice versa
        Specified by:
        negate in interface Negatable
        Specified by:
        negate in class BooleanExpression
        Returns:
        the negation of this expression