Class SubstringBefore

All Implemented Interfaces:
Callable, StatefulSystemFunction, FunctionItem, GroundedValue, Item, Sequence

public class SubstringBefore extends CollatingFunctionFixed
Implements the fn:substring-before() function with the collation already known
  • Constructor Details

    • SubstringBefore

      public SubstringBefore()
  • Method Details

    • isSubstringMatchingFunction

      public boolean isSubstringMatchingFunction()
      Description copied from class: CollatingFunctionFixed
      Ask whether this function needs a collation that can handle substring matching
      Overrides:
      isSubstringMatchingFunction in class CollatingFunctionFixed
      Returns:
      true in the case of functions such as contains() and starts-with() where substring matching is required. Returns false by default;
    • call

      public StringValue call(XPathContext context, Sequence[] arguments) throws XPathException
      Evaluate the expression
      Parameters:
      context - the dynamic evaluation context
      arguments - the values of the arguments, supplied as Sequences
      Returns:
      the result of the evaluation, in the form of a Sequence
      Throws:
      XPathException - if a dynamic error occurs during the evaluation of the expression
    • getElaborator

      public Elaborator getElaborator()
      Make an elaborator for a system function call on this function
      Overrides:
      getElaborator in class SystemFunction
      Returns:
      a suitable elaborator; or null if no custom elaborator is available