Class Concat

    • Constructor Detail

      • Concat

        public Concat()
    • Method Detail

      • getRequiredType

        protected SequenceType getRequiredType​(int arg)
        Get the required type of the nth argument
        Overrides:
        getRequiredType in class SystemFunction
        Parameters:
        arg - the number of the argument whose type is requested, zero-based
        Returns:
        the required type of the argument as defined in the function signature
      • evaluateAsString

        public java.lang.CharSequence evaluateAsString​(XPathContext c)
                                                throws XPathException
        Evaluate the function in a string context
        Overrides:
        evaluateAsString in class Expression
        Parameters:
        c - The context in which the expression is to be evaluated
        Returns:
        the value of the expression, evaluated in the current context. The expression must return a string or (); if the value of the expression is (), this method returns "".
        Throws:
        XPathException - if any dynamic error occurs evaluating the expression
      • evaluateItem

        public Item evaluateItem​(XPathContext c)
                          throws XPathException
        Evaluate in a general context
        Overrides:
        evaluateItem in class Expression
        Parameters:
        c - 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
      • process

        public void process​(XPathContext context)
                     throws XPathException
        Process the instruction in push mode. This avoids constructing the concatenated string in memory, instead each argument can be sent straight to the serializer.
        Overrides:
        process in class Expression
        Parameters:
        context - The dynamic context, giving access to the current node, the current variables, etc.
        Throws:
        XPathException - if a dynamic error occurs