Package org.jacop.set.constraints

Class AdisjointB

java.lang.Object
org.jacop.constraints.DecomposedConstraint<Constraint>
org.jacop.constraints.Constraint
org.jacop.set.constraints.AdisjointB
All Implemented Interfaces:
SatisfiedPresent, UsesQueueVariable
public class AdisjointB extends Constraint implements UsesQueueVariable, SatisfiedPresent
The disjoint set constraint makes sure that two set variables do not contain any common element.
Version:
4.10

  • Field Details

    • idNumber

      static AtomicInteger idNumber

    • a

      public SetVar a
      It specifies set variable a.

    • b

      public SetVar b
      It specifies set variable b.

    • performCardinalityReasoning

      public boolean performCardinalityReasoning
      It specifies if the constrain attempts to perform expensive and yet unlikely propagation due to cardinality information.

    • aHasChanged

      private boolean aHasChanged

    • bHasChanged

      private boolean bHasChanged

  • Constructor Details

    • AdisjointB

      public AdisjointB(SetVar a, SetVar b)
      It constructs a disjont set constraint to restrict the domains of the variables A and B.
      Parameters:
      a - variable that is restricted to not have any element in common with b.
      b - variable that is restricted to not have any element in common with a.

  • 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.

    • toString

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

    • queueVariable

      public void queueVariable(int level, Var variable)
      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.
      variable - variable which has changed.