Class LexOrder

    • Field Detail

      • idNumber

        static java.util.concurrent.atomic.AtomicInteger idNumber
      • x

        public IntVar[] x
        Two vectors that have to be lexicographically ordered.
      • lexLT

        public boolean lexLT
        Is Lex enforcing "<" relationship?
      • originalLexLT

        public boolean originalLexLT
        Is Lex enforcing "<" relationship?
      • n

        int n
        size of the longest vector
      • satisfied

        boolean satisfied
      • store

        private Store store
      • satisfiedWhenDefined

        private boolean satisfiedWhenDefined
      • alpha

        private int alpha
      • beta

        private int beta
      • varXToIndex

        java.util.Map<IntVar,​int[]> varXToIndex
      • varYToIndex

        java.util.Map<IntVar,​int[]> varYToIndex
    • Constructor Detail

      • LexOrder

        public LexOrder​(IntVar[] x,
                        IntVar[] y)
        It creates a lexicographical order for vectors x and y,

        vectors x and y does not need to be of the same size. boolean lt defines if we require strict order, Lex_{<} (lt = true) or Lex_{=<} (lt = false)

        Parameters:
        x - first vector constrained by LexOrder constraint.
        y - second vector constrained by LexOrder constraint.
      • LexOrder

        public LexOrder​(IntVar[] x,
                        IntVar[] y,
                        boolean lt)
    • Method Detail

      • 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.
      • 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.
      • queueVariable

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

        public void removeLevelLate​(int level)
        Description copied from interface: RemoveLevelLate
        This function is called in case of the backtrack. It is called after all timestamps, variables, mutablevariables have reverted to their values *after* removing the level.
        Specified by:
        removeLevelLate in interface RemoveLevelLate
        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
      • establishGACInit

        protected void establishGACInit()
      • reestablishGAC

        void reestablishGAC​(int i)
      • updateAlpha

        public void updateAlpha()
      • updateBeta

        public void updateBeta​(int i)
      • eqSingletons

        private boolean eqSingletons​(IntVar x,
                                     IntVar y)
      • forceLT

        private void forceLT​(int i)
      • forceLE

        private void forceLE​(int i)