Class PropElement

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

    public class PropElement
    extends Propagator<IntVar>
    VALUE = TABLE[INDEX-OFFSET], ensuring arc consistency on result and index.
    Since:
    02/02/12
    Author:
    Hadrien Cambazard, Fabien Hermenier, Charles Prud'homme, Jean-Guillaume Fages
    • Constructor Detail

      • PropElement

        public PropElement​(IntVar value,
                           int[] values,
                           IntVar index,
                           int offset)
        Create a propagator which ensures that VALUE = TABLE[INDEX-OFFSET] holds.
        Parameters:
        value - integer variable
        values - array of ints
        index - integer variable
        offset - int
    • Method Detail

      • propagate

        public 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 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