org.jacop.constraints

Class Conditional

java.lang.Object

org.jacop.constraints.DecomposedConstraint<Constraint>

org.jacop.constraints.Constraint

org.jacop.constraints.Conditional

All Implemented Interfaces:

SatisfiedPresent

public class Conditional
extends Constraint
implements SatisfiedPresent

Conditional constraint implements conditional constraint satisfiability. It enforces consistency of constraint c[k] where b[k] = 1 (true) and all b[i] for i < k are 0 (false).

Version:

4.9

Author:

Krzysztof Kuchcinski

Field Summary

Fields

Modifier and Type	Field and Description
IntVar[]	b The list of 0/1 (Boolean) variables for assignment decision.
PrimitiveConstraint[]	c The list of constraints that are to be selected.

Fields inherited from class org.jacop.constraints.Constraint

atomicExecution, consistencyPruningEvents, constraintScope, earlyTerminationOK, increaseWeight, numberId, scope, trace

Fields inherited from class org.jacop.constraints.DecomposedConstraint

queueIndex

Constructor Summary

Constructors

Constructor and Description
Conditional(IntVar[] b, PrimitiveConstraint[] c) It constructs a Conditional constraint.
Conditional(List<? extends IntVar> b, List<? extends PrimitiveConstraint> c) It constructs a Conditional constraint.

Method Summary

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.
int	getDefaultConsistencyPruningEvent()
boolean	satisfied() It checks if the constraint is satisfied.
String	toString() It produces a string representation of a constraint state.

Methods inherited from class org.jacop.constraints.Constraint

afc, arguments, cleanAfterFailure, decompose, getConsistencyPruningEvent, getGuideConstraint, getGuideValue, getGuideVariable, grounded, grounded, id, impose, impose, imposeDecomposition, increaseWeight, intArrayToString, long2int, numberArgs, queueVariable, removeConstraint, requiresMonotonicity, setConsistencyPruningEvent, setConstraintScope, setScope, setScope, setScope, setScope, setScope, setWatchedVariableGrounded, supplyGuideFeedback, updateAFC, watchedVariableGrounded

Methods inherited from class org.jacop.constraints.DecomposedConstraint

auxiliaryVariables, checkInput, checkInput, checkInputForDuplication, checkInputForDuplicationSkipSingletons, checkInputForNullness, checkInputForNullness, checkInputForNullness, derivative, getDubletonsSkipSingletons, imposeDecomposition

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

b

public final IntVar[] b

The list of 0/1 (Boolean) variables for assignment decision.

c

public final PrimitiveConstraint[] c

The list of constraints that are to be selected.

Constructor Detail

Conditional

public Conditional(IntVar[] b,
                   PrimitiveConstraint[] c)

It constructs a Conditional constraint.

Parameters:

b - 0/1 variables for selection of constraint

c - constraints for selection.

Conditional

public Conditional(List<? extends IntVar> b,
                   List<? extends PrimitiveConstraint> c)

It constructs a Conditional constraint.

Parameters:

b - 0/1 variables for selection of constraint

c - constraints for selection.

Method Detail

getDefaultConsistencyPruningEvent

public int getDefaultConsistencyPruningEvent()

Specified by:

getDefaultConsistencyPruningEvent in class Constraint

consistency

public void consistency(Store store)

Description copied from class: Constraint

It is a (most probably incomplete) consistency function which removes the values from variables domains. Only values which do not have any support in a solution space are removed.

Specified by:

consistency in class Constraint

Parameters:

store - constraint store within which the constraint consistency is being checked.

satisfied

public boolean satisfied()

Description copied from interface: SatisfiedPresent

It checks if the constraint is satisfied. It can return false even if constraint is satisfied but not all variables in its scope are grounded. It needs to return true if all variables in its scope are grounded and constraint is satisfied.

Implementations of this interface for constraints that are not PrimitiveConstraint may require constraint imposition and consistency check as a requirement to work correctly.

Specified by:

satisfied in interface SatisfiedPresent

Returns:

true if constraint is possible to verify that it is satisfied.

toString

public String toString()

Description copied from class: Constraint

It produces a string representation of a constraint state.

Overrides:

toString in class Constraint