public class AmongVar extends Constraint implements UsesQueueVariable, Stateful, SatisfiedPresent
This constraint significantly extends the algorithms presented in the literature as it does not use the decomposition into simpler constraints.
Therefore as a result, it provides stronger pruning methods without noticeable increase in the execution time. The large part of the computation is reused across following executions of the consistency function. The strength of propagation algorithm is incomporable to BC.
Modifier and Type  Field and Description 

static boolean 
debugAll
It turns out printing debugging information.

IntVar[] 
listOfX
List of variables x which values are checked against values of variables y.

IntVar[] 
listOfY
It specifies what values we are counting in the list of x's.

IntVar 
n
It specifies the number of x variables equal to at least one value present in the list of y.

atomicExecution, consistencyPruningEvents, constraintScope, earlyTerminationOK, increaseWeight, numberId, scope, trace
queueIndex
Constructor and Description 

AmongVar(IntVar[] listOfX,
IntVar[] listOfY,
IntVar n)
It constructs an AmongVar constraint.

AmongVar(List<IntVar> listOfX,
List<IntVar> listOfY,
IntVar n)
It constructs an AmongVar constraint.

Modifier and Type  Method and Description 

void 
consistency(Store store)
It is a (most probably incomplete) consistency function which removes the
values from variables domains.

void 
consistencyForX(Store store)
Is called when all y are grounded and amongForSet is equivalent to simple version of Among.

void 
consistencyForY(Store store)
It is a function which makes Y consistent if all X's are grounded.

void 
consistencyWhen_LB0_EQ_UB0(Store store)
The number of x in lbsDom is equal to the number of X intersecting ubSDom.

int 
getDefaultConsistencyPruningEvent() 
void 
impose(Store store)
It imposes the constraint in a given store.

void 
queueVariable(int level,
Var var)
This is a function called to indicate which variable in a scope of
constraint has changed.

void 
removeLevel(int level)
This function is called in case of the backtrack, so a constraint can
clear the queue of changed variables which is no longer valid.

boolean 
satisfied()
It checks if the constraint is satisfied.

String 
toString()
It produces a string representation of a constraint state.

afc, arguments, cleanAfterFailure, decompose, getConsistencyPruningEvent, getGuideConstraint, getGuideValue, getGuideVariable, grounded, grounded, id, impose, imposeDecomposition, increaseWeight, intArrayToString, numberArgs, removeConstraint, requiresMonotonicity, setConsistencyPruningEvent, setConstraintScope, setScope, setScope, setScope, setScope, setScope, setWatchedVariableGrounded, supplyGuideFeedback, updateAFC, watchedVariableGrounded
auxiliaryVariables, checkInput, checkInput, checkInputForDuplication, checkInputForDuplicationSkipSingletons, checkInputForNullness, checkInputForNullness, checkInputForNullness, derivative, getDubletonsSkipSingletons, imposeDecomposition
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
isStateful
public static final boolean debugAll
public IntVar[] listOfX
public IntVar[] listOfY
public IntVar n
public AmongVar(IntVar[] listOfX, IntVar[] listOfY, IntVar n)
listOfX
 the list of variables whose equality to other set of variables we countlistOfY
 the list of variable to which equality is counted.n
 how many variables from list x are equal to at least one variable from list y.public AmongVar(List<IntVar> listOfX, List<IntVar> listOfY, IntVar n)
listOfX
 the list of variables whose equality to other set of variables we countlistOfY
 the list of variable to which equality is counted.n
 how many variables from list x are equal to at least one variable from list y.public void removeLevel(int level)
Stateful
removeLevel
in interface Stateful
level
 the level which is being removed.public void consistencyForX(Store store)
store
 constraint store in which context that consistency function is being executed.public void consistencyWhen_LB0_EQ_UB0(Store store)
1) If there are not enough of y to cover future domain then fail 2)
store
 a constraint store in which context all prunings are executed.public void consistencyForY(Store store)
store
 a constraint store in which context all prunings are executed.public void consistency(Store store)
Constraint
consistency
in class Constraint
store
 constraint store within which the constraint consistency is being checked.public int getDefaultConsistencyPruningEvent()
getDefaultConsistencyPruningEvent
in class Constraint
public void impose(Store store)
Constraint
impose
in class Constraint
store
 the constraint store to which the constraint is imposed to.public void queueVariable(int level, Var var)
Constraint
queueVariable
in class Constraint
level
 the level of the store at which the change has occurred.var
 variable which has changed.public boolean satisfied()
SatisfiedPresent
Implementations of this interface for constraints that are not PrimitiveConstraint may require constraint imposition and consistency check as a requirement to work correctly.
satisfied
in interface SatisfiedPresent
public String toString()
Constraint
toString
in class Constraint
Copyright © 2020. All rights reserved.