Class AbsXeqY

All Implemented Interfaces:
SatisfiedPresent, Stateful, StoreAware

public class AbsXeqY extends PrimitiveConstraint implements Stateful
Constraints |X| #= Y

Domain and bounds consistency can be used; third parameter of constructor controls this.

Version:
4.10
  • Field Details

    • idNumber

      static final AtomicInteger idNumber
    • debugAll

      static final boolean debugAll
      See Also:
    • firstConsistencyCheck

      boolean firstConsistencyCheck
    • domainConsistent

      boolean domainConsistent
    • firstConsistencyLevel

      int firstConsistencyLevel
    • x

      public final IntVar x
      It contains variable x.
    • y

      public final IntVar y
      It contains variable y.
  • Constructor Details

    • AbsXeqY

      public AbsXeqY(IntVar x, IntVar y)
      It constructs |X| = Y constraints.
      Parameters:
      x - variable X1
      y - variable Y
    • AbsXeqY

      public AbsXeqY(IntVar x, IntVar y, boolean domConsistency)
      It constructs |X| = Y constraints.
      Parameters:
      x - variable X1
      y - variable Y
      domConsistency - controls which consistency method is used; true = domain, false = bound
  • Method Details

    • removeLevel

      public void removeLevel(int level)
      Description copied from interface: Stateful
      This function is called in case of the backtrack, so a constraint can clear the queue of changed variables which is no longer valid. This function is called *before* all timestamps, variables, mutablevariables have reverted to their previous value.
      Specified by:
      removeLevel in interface Stateful
      Parameters:
      level - the level which is being removed.
    • 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.
    • domainConsistency

      void domainConsistency(Store store)
    • boundConsistency

      void boundConsistency(Store store)
    • getDefaultNestedConsistencyPruningEvent

      protected int getDefaultNestedConsistencyPruningEvent()
      Overrides:
      getDefaultNestedConsistencyPruningEvent in class PrimitiveConstraint
    • getDefaultNestedNotConsistencyPruningEvent

      protected int getDefaultNestedNotConsistencyPruningEvent()
      Overrides:
      getDefaultNestedNotConsistencyPruningEvent in class PrimitiveConstraint
    • getDefaultNotConsistencyPruningEvent

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

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

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