Module org.chocosolver
Class PropAtMostNValues
- java.lang.Object
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- org.chocosolver.solver.constraints.Propagator<IntVar>
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- org.chocosolver.solver.constraints.nary.nvalue.PropAtMostNValues
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- All Implemented Interfaces:
Comparable<Propagator>
,ICause
,Identity
public class PropAtMostNValues 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
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Field Summary
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Fields inherited from class org.chocosolver.solver.constraints.Propagator
ACTIVE, constraint, DEFAULT_EXPL, model, operations, OUTPUT_DEFAULT_EXPL, priority, reactToFineEvt, state, vars
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Constructor Summary
Constructors Constructor Description PropAtMostNValues(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
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description ESat
isEntailed()
Check wetherthis
is entailed according to the current state of its internal structure.void
propagate(int evtmask)
Call the main filtering algorithm to apply to theDomain
of theVariable
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
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Constructor Detail
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PropAtMostNValues
public PropAtMostNValues(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 variablesconcernedValues
- will be sorted!nValues
- integer variable
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Method Detail
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propagate
public void propagate(int evtmask) throws ContradictionException
Description copied from class:Propagator
Call the main filtering algorithm to apply to theDomain
of theVariable
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 classPropagator<IntVar>
- Parameters:
evtmask
- type of propagation eventthis
must consider.- Throws:
ContradictionException
- when a contradiction occurs, like domain wipe out or other incoherencies.
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isEntailed
public ESat isEntailed()
Description copied from class:Propagator
Check wetherthis
is entailed according to the current state of its internal structure. At least, should check the satisfaction ofthis
(when all is instantiated).- Specified by:
isEntailed
in classPropagator<IntVar>
- Returns:
- ESat.TRUE if entailed, ESat.FALSE if not entailed, ESat.UNDEFINED if unknown
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