java.lang.Object
org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin
org.apache.jena.reasoner.rulesys.builtins.Difference
All Implemented Interfaces:
Builtin

public class Difference extends BaseBuiltin
Bind the third argument to the arithmetic difference between the first and second arguments.
  • Constructor Details

    • Difference

      public Difference()
  • Method Details

    • getName

      public String getName()
      Return a name for this builtin, normally this will be the name of the functor that will be used to invoke it.
    • getArgLength

      public int getArgLength()
      Return the expected number of arguments for this functor or 0 if the number is flexible.
      Specified by:
      getArgLength in interface Builtin
      Overrides:
      getArgLength in class BaseBuiltin
    • bodyCall

      public boolean bodyCall(Node[] args, int length, RuleContext context)
      This method is invoked when the builtin is called in a rule body.
      Specified by:
      bodyCall in interface Builtin
      Overrides:
      bodyCall in class BaseBuiltin
      Parameters:
      args - the array of argument values for the builtin, this is an array of Nodes, some of which may be Node_RuleVariables.
      length - the length of the argument list, may be less than the length of the args array for some rule engines
      context - an execution context giving access to other relevant data
      Returns:
      return true if the buildin predicate is deemed to have succeeded in the current environment