Class StringLength_1

All Implemented Interfaces:
Callable, Function, GroundedValue, Item, Sequence

public class StringLength_1 extends ScalarSystemFunction
Implement the XPath string-length() function
  • Constructor Details

    • StringLength_1

      public StringLength_1()
  • Method Details

    • getIntegerBounds

      public IntegerValue[] getIntegerBounds()
      For an expression that returns an integer or a sequence of integers, get a lower and upper bound on the values of the integers that may be returned, from static analysis. The default implementation returns null, meaning "unknown" or "not applicable". Other implementations return an array of two IntegerValue objects, representing the lower and upper bounds respectively. The values UNBOUNDED_LOWER and UNBOUNDED_UPPER are used by convention to indicate that the value may be arbitrarily large. The values MAX_STRING_LENGTH and MAX_SEQUENCE_LENGTH are used to indicate values limited by the size of a string or the size of a sequence.
      Overrides:
      getIntegerBounds in class SystemFunction
      Returns:
      the lower and upper bounds of integer values in the result, or null to indicate unknown or not applicable.
    • resultWhenEmpty

      public Sequence resultWhenEmpty()
      Description copied from class: ScalarSystemFunction
      Method that may be supplied in subclasses, to indicate the result that is returned when an empty sequence is supplied as the argument value. The default is to return the empty sequence
      Overrides:
      resultWhenEmpty in class ScalarSystemFunction
      Returns:
      the result of evaluation when the supplied argument is an empty sequence
    • evaluate

      public AtomicValue evaluate(Item arg, XPathContext context) throws XPathException
      Description copied from class: ScalarSystemFunction
      Abstract method that must be supplied in subclasses to perform the evaluation
      Specified by:
      evaluate in class ScalarSystemFunction
      Parameters:
      arg - the supplied argument
      context - the dynamic context
      Returns:
      the result of the evaluation
      Throws:
      XPathException - if a dynamic error occurs
    • getCompilerName

      public String getCompilerName()
      Description copied from class: SystemFunction
      Get the (local) name of a class that can be used to generate bytecode for this system function
      Overrides:
      getCompilerName in class SystemFunction
      Returns:
      the name of a bytecode generation class, or null if there is no bytecode support for this function