Class PropScale

  • All Implemented Interfaces:
    Comparable<Propagator>, ICause, Identity

    public class PropScale
    extends Propagator<IntVar>
    Scale propagator : ensures x * y = z With y a constant greater than one Ensures AC
    Since:
    08/04/2014
    Author:
    Jean-Guillaume Fages
    • Constructor Detail

      • PropScale

        public PropScale​(IntVar x,
                         int y,
                         IntVar z)
        Scale propagator : ensures x * y = z
        Parameters:
        x - an integer variable
        y - a constant (should be >1)
        z - an integer variable
    • Method Detail

      • propagate

        public final void propagate​(int evtmask)
                             throws ContradictionException
        Description copied from class: Propagator
        Call the main filtering algorithm to apply to the Domain of the Variable objects. It considers the current state of this objects to remove some values from domains and/or instantiate some variables. Calling this method is done from 2 (and only 2) steps:
        - at the initial propagation step,
        - when involved in a reified constraint.
        It should initialized the internal data structure and apply filtering algorithm from scratch.
        Specified by:
        propagate in class Propagator<IntVar>
        Parameters:
        evtmask - type of propagation event this must consider.
        Throws:
        ContradictionException - when a contradiction occurs, like domain wipe out or other incoherencies.
      • isEntailed

        public final ESat isEntailed()
        Description copied from class: Propagator
        Check wether this is entailed according to the current state of its internal structure. At least, should check the satisfaction of this (when all is instantiated).
        Specified by:
        isEntailed in class Propagator<IntVar>
        Returns:
        ESat.TRUE if entailed, ESat.FALSE if not entailed, ESat.UNDEFINED if unknown