Module org.chocosolver

Package org.chocosolver.solver.constraints.nary.nvalue

Class PropAtLeastNValues

java.lang.Object

org.chocosolver.solver.constraints.Propagator<IntVar>

org.chocosolver.solver.constraints.nary.nvalue.PropAtLeastNValues

All Implemented Interfaces:

Comparable<Propagator>, ICause, Identity

public class PropAtLeastNValues
extends Propagator<IntVar>

Propagator for the atMostNValues constraint The number of distinct values in the set of variables vars is at most equal to nValues No level of consistency but better than BC in general (for enumerated domains with holes)

Author:

Jean-Guillaume Fages

Field Summary

Fields inherited from class org.chocosolver.solver.constraints.Propagator

ACTIVE, constraint, DEFAULT_EXPL, model, operations, OUTPUT_DEFAULT_EXPL, priority, reactToFineEvt, state, vars

Constructor Summary

Constructors

Constructor	Description
PropAtLeastNValues(IntVar[] variables, int[] concernedValues, IntVar nValues)	Propagator for the NValues constraint The number of distinct values among concerned values in the set of variables vars is exactly equal to nValues No level of consistency for the filtering

Method Summary

Modifier and Type	Method	Description
ESat	isEntailed()	Check wether this is entailed according to the current state of its internal structure.
void	propagate(int evtmask)	Call the main filtering algorithm to apply to the Domain of the Variable objects.

Methods inherited from class org.chocosolver.solver.constraints.Propagator

addVariable, arity, compareTo, defaultExplain, doFinePropagation, doFlush, doSchedule, doScheduleEvent, dynPriority, equals, explain, fails, forcePropagate, forcePropagationOnBacktrack, forEachIntVar, getConstraint, getId, getModel, getNbVars, getPosition, getPriority, getPropagationConditions, getVar, getVars, getVIndice, getVIndices, hashCode, isActive, isCompletelyInstantiated, isPassive, isReified, isReifiedAndSilent, isScheduled, isStateLess, linkVariables, propagate, reactToFineEvent, reifiedWith, setActive, setActive0, setPassive, setPosition, setReifiedSilent, setReifiedTrue, setVIndices, toString, unlinkVariables, unschedule

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

PropAtLeastNValues

public PropAtLeastNValues(IntVar[] variables,
                          int[] concernedValues,
                          IntVar nValues)

Propagator for the NValues constraint The number of distinct values among concerned values in the set of variables vars is exactly equal to nValues No level of consistency for the filtering

Parameters:

variables - array of integer variables

concernedValues - will be sorted!

nValues - integer variable

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