Class EqBool

  • All Implemented Interfaces:
    SatisfiedPresent, StoreAware

    public class EqBool
    extends PrimitiveConstraint
    If all x's are equal to each other then result variable is equal 1. Otherwise, result variable is equal to zero. It restricts the domains of all variables to be either 0 or 1.
    Version:
    4.8
    • Field Detail

      • idNumber

        static java.util.concurrent.atomic.AtomicInteger idNumber
      • list

        public IntVar[] list
        It specifies x variables in the constraint.
      • result

        public IntVar result
        It specifies variable result in the constraint.
      • constraints

        java.util.List<Constraint> constraints
    • Constructor Detail

      • EqBool

        public EqBool​(IntVar[] list,
                      IntVar result)
        It constructs eqBool.
        Parameters:
        list - list of x's which must all be equal to the same value to make result equal 1.
        result - variable which is equal 0 if x's contain different values.
      • EqBool

        public EqBool​(java.util.List<? extends IntVar> list,
                      IntVar result)
        It constructs eqBool.
        Parameters:
        list - list of variables which must all be equal to the same value to make result equal 1.
        result - variable which is equal 0 if variables from list contain different values.
    • Method Detail

      • checkInvariants

        public java.lang.String checkInvariants()
        It checks invariants required by the constraint. Namely that boolean variables have boolean domain.
        Returns:
        the string describing the violation of the invariant, null otherwise.
      • consistency

        public void consistency​(Store store)
        Description copied from class: Constraint
        It is a (most probably incomplete) consistency function which removes the values from variables domains. Only values which do not have any support in a solution space are removed.
        Specified by:
        consistency in class Constraint
        Parameters:
        store - constraint store within which the constraint consistency is being checked.
      • notConsistency

        public void notConsistency​(Store store)
        Description copied from class: PrimitiveConstraint
        It makes pruning in such a way that constraint is notConsistent. It removes values which always belong to a solution.
        Specified by:
        notConsistency in class PrimitiveConstraint
        Parameters:
        store - the constraint store in which context the notConsistency technique is evaluated.
      • satisfied

        public boolean satisfied()
        Description copied from interface: SatisfiedPresent
        It checks if the constraint is satisfied. It can return false even if constraint is satisfied but not all variables in its scope are grounded. It needs to return true if all variables in its scope are grounded and constraint is satisfied.

        Implementations of this interface for constraints that are not PrimitiveConstraint may require constraint imposition and consistency check as a requirement to work correctly.

        Returns:
        true if constraint is possible to verify that it is satisfied.
      • notSatisfied

        public boolean notSatisfied()
        Description copied from class: PrimitiveConstraint
        It checks if constraint would be always not satisfied.
        Specified by:
        notSatisfied in class PrimitiveConstraint
        Returns:
        true if constraint must be notSatisfied, false otherwise.
      • toString

        public java.lang.String toString()
        Description copied from class: Constraint
        It produces a string representation of a constraint state.
        Overrides:
        toString in class Constraint
      • decompose

        public java.util.List<Constraint> decompose​(Store store)
        Description copied from class: Constraint
        It returns an array list of constraint which are used to decompose this constraint. It actually creates a decomposition (possibly also creating variables), but it does not impose the constraint.
        Overrides:
        decompose in class Constraint
        Parameters:
        store - the constraint store in which context the decomposition takes place.
        Returns:
        an array list of constraints used to decompose this constraint.
      • imposeDecomposition

        public void imposeDecomposition​(Store store)
        Description copied from class: Constraint
        It imposes the decomposition of the given constraint in a given store.
        Overrides:
        imposeDecomposition in class Constraint
        Parameters:
        store - the constraint store to which the constraint is imposed to.