Class AccessorFn

All Implemented Interfaces:
Callable, Function, GroundedValue, Item, Sequence
Direct Known Subclasses:
AccessorFn.DayFromDate, AccessorFn.DayFromDateTime, AccessorFn.DaysFromDuration, AccessorFn.HoursFromDateTime, AccessorFn.HoursFromDuration, AccessorFn.HoursFromTime, AccessorFn.LocalNameFromQName, AccessorFn.MinutesFromDateTime, AccessorFn.MinutesFromDuration, AccessorFn.MinutesFromTime, AccessorFn.MonthFromDate, AccessorFn.MonthFromDateTime, AccessorFn.MonthsFromDuration, AccessorFn.NamespaceUriFromQName, AccessorFn.PrefixFromQName, AccessorFn.SecondsFromDateTime, AccessorFn.SecondsFromDuration, AccessorFn.SecondsFromTime, AccessorFn.TimezoneFromDate, AccessorFn.TimezoneFromDateTime, AccessorFn.TimezoneFromTime, AccessorFn.YearFromDate, AccessorFn.YearFromDateTime, AccessorFn.YearsFromDuration

public abstract class AccessorFn extends ScalarSystemFunction
This class supports the get_X_from_Y functions defined in XPath 2.0
  • Constructor Details

    • AccessorFn

      public AccessorFn()
  • Method Details

    • getComponentId

      public abstract AccessorFn.Component getComponentId()
    • 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.
    • evaluate

      public AtomicValue evaluate(Item item, XPathContext context) throws XPathException
      Evaluate the expression
      Specified by:
      evaluate in class ScalarSystemFunction
      Parameters:
      item - 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