Class SumWeightedSet

All Implemented Interfaces:
SatisfiedPresent

public class SumWeightedSet extends Constraint implements SatisfiedPresent
It computes a weighted sum of the elements in the domain of the given set variable. The sum must be equal to the specified sum variable.
Version:
4.10
  • Field Details

    • idNumber

      static AtomicInteger idNumber
    • a

      public SetVar a
      A set variable a whose elements contribute with their weight to the sum.
    • totalWeight

      public IntVar totalWeight
      Integer variable containing the total weight of all elements within a set variable a.
    • increasingCosts

      boolean increasingCosts
      It specifies if the costs of elements are increasing given the lexical order of the elements.
    • elementWeights

      Map<Integer,Integer> elementWeights
      It provides a quick access to the weights of given elements of the set.
  • Constructor Details

    • SumWeightedSet

      public SumWeightedSet(SetVar a, int[] elements, int[] weights, IntVar totalWeight)
      It constructs a weighted set sum constraint.
      Parameters:
      a - a set variable for which the weighted sum of its element is computed.
      elements - it specifies the elements which are allowed and for which the weight is specified.
      weights - the weight for each element present in a.lub().
      totalWeight - an integer variable equal to the total weight of the elements in set variable a.
    • SumWeightedSet

      public SumWeightedSet(SetVar a, IntVar totalWeight)
      It constructs a weighted set sum constraint. This constructor assumes that every element within a set variable has a weight equal to its value.
      Parameters:
      a - set variable being used in weighted set constraint.
      totalWeight - integer variable containing information about total weight of the elements in set variable a.
    • SumWeightedSet

      public SumWeightedSet(SetVar a, int[] weights, IntVar totalWeight)
      It constructs a weighted set sum constraint. This constructor assumes that every element within a set variable has a weight equal to its value.
      Parameters:
      a - set variable being used in weighted set constraint.
      weights - it specifies a weight for each possible element of a set variable.
      totalWeight - integer variable containing information about total weight of the elements in set variable 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.
    • getConsistencyPruningEvent

      public int getConsistencyPruningEvent(Var var)
      Description copied from class: Constraint
      It retrieves the pruning event which causes reevaluation of the constraint.
      Overrides:
      getConsistencyPruningEvent in class Constraint
      Parameters:
      var - variable for which pruning event is retrieved
      Returns:
      it returns the int code of the pruning event (GROUND, BOUND, ANY, NONE)
    • 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