Class Resolve.ClpResolvePredicate

java.lang.Object
org.projog.core.predicate.builtin.clp.Resolve.ClpResolvePredicate
All Implemented Interfaces:
Predicate
Enclosing class:
Resolve
private static final class Resolve.ClpResolvePredicate extends Object implements Predicate

  • Field Details

    • bruteForceSearch

      private final org.projog.clp.BruteForceSearch bruteForceSearch

    • variables

      private final Map<ClpVariable, org.projog.clp.Variable> variables

  • Constructor Details

    • ClpResolvePredicate

      private ClpResolvePredicate(org.projog.clp.BruteForceSearch bruteForceSearch, Map<ClpVariable, org.projog.clp.Variable> variables)

  • Method Details

    • evaluate

      public boolean evaluate()
      Description copied from interface: Predicate
      Attempts to satisfy the goal this instance represents.

      Calling this method multiple times on a single instance allows all possible answers to be identified. An attempt to find a solution carries on from where the last successful call finished.

      If PredicateFactory.isRetryable() returns false then this method should only be called once per individual query (no attempt should be made to find alternative solutions).

      If PredicateFactory.isRetryable() returns true then, in order to find all possible solutions for an individual query, this method should be recalled on backtracking until it returns false.

      Specified by:
      evaluate in interface Predicate
      Returns:
      true if it was possible to satisfy the clause, false otherwise
      See Also:

    • next

      private org.projog.clp.ClpConstraintStore next()

    • couldReevaluationSucceed

      public boolean couldReevaluationSucceed()
      Description copied from interface: Predicate
      Could the next re-evaluation of this instance succeed?

      Specifies whether a specific instance of a specific implementation of Predicate, that has already had Predicate.evaluate() called on it at least once, could possibly return true the next time Predicate.evaluate() is called on it. i.e. is it worth trying to continue to find solutions for the specific query this particular instance represents and has been evaluating?

      (Note: the difference between this method and PredicateFactory.isRetryable() is that PredicateFactory.isRetryable() deals with whether, in general, a specific implementation (rather than instance) of Predicate could ever produce multiple answers for an individual query.)

      Specified by:
      couldReevaluationSucceed in interface Predicate
      Returns:
      true if an attempt to re-evaluate this instance could possible succeed, false otherwise