Class CountBounds

All Implemented Interfaces:
SatisfiedPresent, StoreAware

public class CountBounds extends PrimitiveConstraint
CountBounds constraint implements the counting over number of occurrences of a given value in a list of variables. The number of occurrences is specified by lower bound and upper bound, lb and ub.
Version:
4.10
  • Field Details

    • idNumber

      static final AtomicInteger idNumber
    • lb

      final int lb
      It specifies a lower and upper bounds of occurences of the specified value in a list.
    • ub

      final int ub
    • list

      public final IntVar[] list
      The list of variables which are checked and counted if equal to specified value.
    • value

      public final int value
      The value to which is any variable is equal to makes the constraint count it.
    • position

      private TimeStamp<Integer> position
    • equal

      private TimeStamp<Integer> equal
  • Constructor Details

    • CountBounds

      public CountBounds(IntVar[] list, int value, int lb, int ub)
      It constructs a CountBounds constraint.
      Parameters:
      list - variables which equality to val is counted.
      value - value which is counted
      lb - minimal number of occurences of value at list.
      ub - maximal number of occurences of value at list.
    • CountBounds

      public CountBounds(List<? extends IntVar> list, int value, int lb, int ub)
      It constructs a CountBounds constraint.
      Parameters:
      list - variables which equality to val is counted.
      value - value which is counted
      lb - minimal number of occurences of value at list.
      ub - maximal number of occurences of value at list.
  • Method Details

    • impose

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

      public void include(Store store)
      Description copied from interface: StoreAware
      It provide store for constraints that are not imposed but called from other constraints.
      Specified by:
      include in interface StoreAware
      Overrides:
      include in class PrimitiveConstraint
      Parameters:
      store - the constraint store in which context the constraint is executed.
    • getDefaultConsistencyPruningEvent

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

      protected int getDefaultNotConsistencyPruningEvent()
      Specified by:
      getDefaultNotConsistencyPruningEvent in class PrimitiveConstraint
    • 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.
    • swap

      private void swap(int i, int j)
    • 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 String toString()
      Description copied from class: Constraint
      It produces a string representation of a constraint state.
      Overrides:
      toString in class Constraint