Class Alldifferent

All Implemented Interfaces:
SatisfiedPresent, UsesQueueVariable
Direct Known Subclasses:
Alldiff

public class Alldifferent extends Constraint implements UsesQueueVariable, SatisfiedPresent
Alldifferent constraint assures that all FDVs has differnet values. It uses partial consistency technique.
Version:
4.10
  • Field Details

  • Constructor Details

    • Alldifferent

      protected Alldifferent()
    • Alldifferent

      public Alldifferent(IntVar[] list)
      It constructs the alldifferent constraint for the supplied variable.
      Parameters:
      list - variables which are constrained to take different values.
    • Alldifferent

      public Alldifferent(List<? extends IntVar> variables)
      It constructs the alldifferent constraint for the supplied variable.
      Parameters:
      variables - variables which are constrained to take different values.
  • Method Details

    • 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.
    • getDefaultConsistencyPruningEvent

      public int getDefaultConsistencyPruningEvent()
      Specified by:
      getDefaultConsistencyPruningEvent in class Constraint
    • 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.

      Specified by:
      satisfied in interface SatisfiedPresent
      Returns:
      true if constraint is possible to verify that it is satisfied.
    • satisfiedFullCheck

      private boolean satisfiedFullCheck(Store S)
    • notSatisfied

      public boolean notSatisfied()
      Check whether the constraint is not satisfied based on bipartite graph matching.
      Returns:
      true if constraint is not satisfied
    • impose

      public void impose(Store store)
      Description copied from class: Constraint
      It imposes the constraint in a given store.
      Overrides:
      impose in class Constraint
      Parameters:
      store - the constraint store to which the constraint is imposed to.
    • queueVariable

      public void queueVariable(int level, Var V)
      Description copied from class: Constraint
      This is a function called to indicate which variable in a scope of constraint has changed. It also indicates a store level at which the change has occurred.
      Overrides:
      queueVariable in class Constraint
      Parameters:
      level - the level of the store at which the change has occurred.
      V - variable which has changed.
    • satisfiedBound

      private boolean satisfiedBound()
    • toString

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