Class SimpleTable

  • All Implemented Interfaces:
    SatisfiedPresent, Stateful, UsesQueueVariable

    public class SimpleTable
    extends Constraint
    implements UsesQueueVariable, Stateful, SatisfiedPresent
    SimpleTable implements the table constraint using a method presented in

    "Compact-Table: Efficient Filtering Table Constraints with Reversible Sparse Bit-Sets" Jordan Demeulenaere, Renaud Hartert, Christophe Lecoutre, Guillaume Perez, Laurent Perron, Jean-Charles Régin, Pierre Schaus. Proc. International Conference on Principles and Practice of Constraint Programming, CP 2016. pp 207-223

    Version:
    4.7
    • Field Detail

      • x

        public IntVar[] x
        Variables within the scope of table constraint
      • tuple

        public int[][] tuple
        Tuples specifying the allowed values
      • words

        TimeStamp<java.lang.Long> words
        Main data structure for the constraint
      • mask

        long mask
      • varMap

        java.util.Map<IntVar,​java.lang.Integer> varMap
      • supports

        java.util.Map<java.lang.Integer,​java.lang.Long>[] supports
        Data specifying support tuples for each variable; static structure created once when constraint is posed.
      • variableQueue

        java.util.Set<IntVar> variableQueue
      • noNoGround

        int noNoGround
      • idNumber

        static java.util.concurrent.atomic.AtomicInteger idNumber
    • Constructor Detail

      • SimpleTable

        public SimpleTable​(IntVar[] list,
                           int[][] tuples)
        It constructs a table constraint.
        Parameters:
        list - the variables in the scope of the constraint.
        tuples - the tuples which define alloed values.
      • SimpleTable

        public SimpleTable​(IntVar[] list,
                           int[][] tuples,
                           boolean reuseTupleArguments)
        It constructs a table constraint.
        Parameters:
        list - the variables in the scope of the constraint.
        tuples - the tuples which define allowed values.
        reuseTupleArguments - specifies if the tuples argument should be used directly without copying.
    • Method Detail

      • validTuple

        boolean validTuple​(int index)
      • impose

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

        void updateTable​(java.util.Set<IntVar> fdvs)
      • intersectWithMask

        boolean intersectWithMask()
      • filterDomains

        void filterDomains()
      • queueVariable

        public void queueVariable​(int level,
                                  Var v)
        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.
        v - variable which has changed.
      • 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.
      • 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.
      • toString

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