Package org.jacop.constraints

Class And

java.lang.Object
org.jacop.constraints.DecomposedConstraint<Constraint>
org.jacop.constraints.Constraint
org.jacop.constraints.PrimitiveConstraint
org.jacop.constraints.And
All Implemented Interfaces:
SatisfiedPresent, StoreAware, UsesQueueVariable
public class And extends PrimitiveConstraint implements UsesQueueVariable
Constraint c1 /\ c2 ... /\ cn
Version:
4.10

  • Field Details

    • idNumber

      static final AtomicInteger idNumber

    • listOfC

      protected final PrimitiveConstraint[] listOfC
      It specifies a list of constraints which must be satisfied to keep And constraint satisfied.

    • queueForward

      private final QueueForward<PrimitiveConstraint> queueForward

    • propagation

      private boolean propagation

  • Constructor Details

    • And

      public And(List<PrimitiveConstraint> listOfC)
      It constructs an And constraint based on primitive constraints. The constraint is satisfied if all constraints are satisfied.
      Parameters:
      listOfC - arraylist of constraints

    • And

      public And(PrimitiveConstraint c1, PrimitiveConstraint c2)
      It constructs a simple And constraint based on two primitive constraints.
      Parameters:
      c1 - the first primitive constraint
      c2 - the second primitive constraint

    • And

      public And(PrimitiveConstraint[] c)
      It constructs an And constraint over an array of primitive constraints.
      Parameters:
      c - an array of primitive constraints constituting the And constraint.

  • 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.

    • getNestedPruningEvent

      public int getNestedPruningEvent(Var var, boolean mode)
      Description copied from class: PrimitiveConstraint
      It retrieves the pruning event for which any composed constraint which uses this constraint should be evaluated. This events are the ones which can change satisfied status?
      Overrides:
      getNestedPruningEvent in class PrimitiveConstraint
      Parameters:
      var - for which pruning event is retrieved
      mode - decides if pruning event for consistency or nonconsistency is required.
      Returns:
      pruning event associated with the given variable for a given consistency mode.

    • 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.

    • 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.

    • 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