Class StaticUserDefinedPredicateFactory.SingleIndexPredicateFactory

java.lang.Object
org.projog.core.predicate.udp.StaticUserDefinedPredicateFactory.SingleIndexPredicateFactory
All Implemented Interfaces:
PredicateFactory, PreprocessablePredicateFactory
Enclosing class:
StaticUserDefinedPredicateFactory
private final class StaticUserDefinedPredicateFactory.SingleIndexPredicateFactory extends Object implements PreprocessablePredicateFactory

  • Field Details

    • argIdx

      private final int argIdx

    • index

      private final Index index

    • actions

      private final ClauseAction[] actions

    • retryable

      private final boolean retryable

  • Constructor Details

    • SingleIndexPredicateFactory

      private SingleIndexPredicateFactory(Clauses clauses)

  • Method Details

    • getPredicate

      public Predicate getPredicate(Term[] args)
      Description copied from interface: PredicateFactory
      Returns a Predicate to be used in the evaluation of a goal.
      Specified by:
      getPredicate in interface PredicateFactory
      Parameters:
      args - the arguments to use in the evaluation of the goal
      Returns:
      Predicate to be used in the evaluation of the goal
      See Also:

    • isRetryable

      public boolean isRetryable()
      Description copied from interface: PredicateFactory
      Should instances of this implementation be re-evaluated when backtracking?

      Some goals (e.g. X is 1) are only meant to be evaluated once (the statement is either true or false) while others (e.g. repeat(3)) are meant to be evaluated multiple times. For instances of Predicate that are designed to possibly have Predicate.evaluate() called on them multiple times for the same individual query this method should return true. For instances of Predicate that are designed to only be evaluated once per individual query this method should return false.

      Specified by:
      isRetryable in interface PredicateFactory
      Returns:
      true if an attempt should be made to re-evaluate instances of implementing classes when backtracking, false otherwise

    • preprocess

      public PredicateFactory preprocess(Term arg)
      Specified by:
      preprocess in interface PreprocessablePredicateFactory