Class Matches

    • Constructor Detail

      • Matches

        public Matches()
    • Method Detail

      • simplify

        public Expression simplify​(ExpressionVisitor visitor)
                            throws XPathException
        Simplify and validate. This is a pure function so it can be simplified in advance if the arguments are known
        Overrides:
        simplify in class FunctionCall
        Parameters:
        visitor - an expression visitor
        Returns:
        the simplified expression
        Throws:
        XPathException - if any error is found (e.g. invalid regular expression)
      • optimize

        public Expression optimize​(ExpressionVisitor visitor,
                                   ItemType 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 SystemFunction
        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)
      • getCompiledRegularExpression

        public RegularExpression getCompiledRegularExpression()
        Get the compiled regular expression, returning null if the regex has not been compiled
        Returns:
        the compiled regular expression, or null
      • tryToCompile

        public static RegularExpression tryToCompile​(Expression[] args,
                                                     int patternArg,
                                                     int flagsArg,
                                                     StaticContext env)
                                              throws XPathException
        Try to precompile the arguments to the function. This method is shared by the implementations of the three XPath functions matches(), replace(), and tokenize().
        Parameters:
        args - the supplied arguments to the function, as an array
        patternArg - the position of the argument containing the regular expression
        flagsArg - the position of the argument containing the flags
        env - the static context
        Returns:
        the compiled regular expression, or null indicating that the information is not available statically so it cannot be precompiled
        Throws:
        XPathException - if any failure occurs, in particular, if the regular expression is invalid