Class Concat

All Implemented Interfaces:
Serializable, SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, SequenceIterable, InstructionInfo, Locator

public class Concat extends SystemFunction
See Also:
  • Constructor Details

    • Concat

      public Concat()
  • Method Details

    • 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 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
      Specified by:
      evaluateItem in interface EvaluableItem
      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