Package org.jacop.constraints
Class IfThenElse
java.lang.Object
org.jacop.constraints.DecomposedConstraint<Constraint>
org.jacop.constraints.Constraint
org.jacop.constraints.PrimitiveConstraint
org.jacop.constraints.IfThenElse
- All Implemented Interfaces:
SatisfiedPresent
,StoreAware
,UsesQueueVariable
Constraint if constraint1 then constraint2 else constraint3
*
- Version:
- 4.9
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Field Summary
FieldsModifier and TypeFieldDescriptionIt specifies constraint condC in the IfThenElse constraint.It specifies constraint elseC in the IfThenElse constraint.(package private) static AtomicInteger
(package private) boolean
final QueueForward<PrimitiveConstraint>
(package private) Store
It specifies constraint condC in the IfThenElse constraint.Fields inherited from class org.jacop.constraints.PrimitiveConstraint
notConsistencyPruningEvents
Fields inherited from class org.jacop.constraints.Constraint
afcWeight, atomicExecution, consistencyPruningEvents, constraintScope, earlyTerminationOK, increaseWeight, numberId, scope, trace, watchedVariableGrounded
Fields inherited from class org.jacop.constraints.DecomposedConstraint
queueIndex
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Constructor Summary
ConstructorsConstructorDescriptionIfThenElse
(PrimitiveConstraint condC, PrimitiveConstraint thenC, PrimitiveConstraint elseC) It creates ifthenelse constraint. -
Method Summary
Modifier and TypeMethodDescriptionvoid
consistency
(Store store) It is a (most probably incomplete) consistency function which removes the values from variables domains.int
It retrieves the pruning event which causes reevaluation of the constraint.int
protected int
int
getNestedPruningEvent
(Var var, boolean mode) It retrieves the pruning event for which any composed constraint which uses this constraint should be evaluated.int
It retrieves the pruning event which causes reevaluation of the constraint notConsistency() function.void
It imposes the constraint in a given store.void
It provide store for constraints that are not imposed but called from other constraints.void
notConsistency
(Store store) It makes pruning in such a way that constraint is notConsistent.boolean
It checks if constraint would be always not satisfied.void
queueVariable
(int level, Var variable) This is a function called to indicate which variable in a scope of constraint has changed.boolean
It checks if the constraint is satisfied.toString()
It produces a string representation of a constraint state.Methods inherited from class org.jacop.constraints.PrimitiveConstraint
getDefaultNestedConsistencyPruningEvent, getDefaultNestedNotConsistencyPruningEvent, setNotConsistencyPruningEvent
Methods inherited from class org.jacop.constraints.Constraint
afc, arguments, cleanAfterFailure, decompose, getGuideConstraint, getGuideValue, getGuideVariable, grounded, grounded, id, impose, imposeDecomposition, increaseWeight, intArrayToString, long2int, numberArgs, removeConstraint, requiresMonotonicity, setConsistencyPruningEvent, setConstraintScope, setScope, setScope, setScope, setScope, setScope, setWatchedVariableGrounded, supplyGuideFeedback, toInt, toInt, updateAFC, watchedVariableGrounded
Methods inherited from class org.jacop.constraints.DecomposedConstraint
auxiliaryVariables, checkInput, checkInput, checkInputForDuplication, checkInputForDuplicationSkipSingletons, checkInputForNullness, checkInputForNullness, checkInputForNullness, derivative, getDubletonsSkipSingletons, imposeDecomposition
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Field Details
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idNumber
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condC
It specifies constraint condC in the IfThenElse constraint. -
thenC
It specifies constraint condC in the IfThenElse constraint. -
elseC
It specifies constraint elseC in the IfThenElse constraint. -
imposed
boolean imposed -
store
Store store -
queueForward
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Constructor Details
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IfThenElse
It creates ifthenelse constraint.- Parameters:
condC
- the condition of the constraint.thenC
- the condition which must be true if the constraint condition is true.elseC
- the condition which must be true if the constraint condition is not true.
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Method Details
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consistency
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 classConstraint
- Parameters:
store
- constraint store within which the constraint consistency is being checked.
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notSatisfied
public boolean notSatisfied()Description copied from class:PrimitiveConstraint
It checks if constraint would be always not satisfied.- Specified by:
notSatisfied
in classPrimitiveConstraint
- Returns:
- true if constraint must be notSatisfied, false otherwise.
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notConsistency
Description copied from class:PrimitiveConstraint
It makes pruning in such a way that constraint is notConsistent. It removes values which always belong to a solution.- Specified by:
notConsistency
in classPrimitiveConstraint
- Parameters:
store
- the constraint store in which context the notConsistency technique is evaluated.
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getNestedPruningEvent
Description copied from class:PrimitiveConstraint
It retrieves the pruning event for which any composed constraint which uses this constraint should be evaluated. This events are the ones which can change satisfied status?- Overrides:
getNestedPruningEvent
in classPrimitiveConstraint
- Parameters:
var
- for which pruning event is retrievedmode
- decides if pruning event for consistency or nonconsistency is required.- Returns:
- pruning event associated with the given variable for a given consistency mode.
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getDefaultNotConsistencyPruningEvent
protected int getDefaultNotConsistencyPruningEvent()- Specified by:
getDefaultNotConsistencyPruningEvent
in classPrimitiveConstraint
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getConsistencyPruningEvent
Description copied from class:Constraint
It retrieves the pruning event which causes reevaluation of the constraint.- Overrides:
getConsistencyPruningEvent
in classConstraint
- Parameters:
var
- variable for which pruning event is retrieved- Returns:
- it returns the int code of the pruning event (GROUND, BOUND, ANY, NONE)
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getDefaultConsistencyPruningEvent
public int getDefaultConsistencyPruningEvent()- Specified by:
getDefaultConsistencyPruningEvent
in classConstraint
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getNotConsistencyPruningEvent
Description copied from class:PrimitiveConstraint
It retrieves the pruning event which causes reevaluation of the constraint notConsistency() function.- Overrides:
getNotConsistencyPruningEvent
in classPrimitiveConstraint
- Parameters:
var
- for which pruning event is retrieved- Returns:
- the int denoting the pruning event associated with given variable.
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impose
Description copied from class:Constraint
It imposes the constraint in a given store.- Overrides:
impose
in classPrimitiveConstraint
- Parameters:
store
- the constraint store to which the constraint is imposed to.
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include
Description copied from interface:StoreAware
It provide store for constraints that are not imposed but called from other constraints.- Specified by:
include
in interfaceStoreAware
- Overrides:
include
in classPrimitiveConstraint
- Parameters:
store
- the constraint store in which context the constraint is executed.
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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 interfaceSatisfiedPresent
- Returns:
- true if constraint is possible to verify that it is satisfied.
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toString
Description copied from class:Constraint
It produces a string representation of a constraint state.- Overrides:
toString
in classConstraint
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queueVariable
Description copied from class:Constraint
This is a function called to indicate which variable in a scope of constraint has changed. It also indicates a store level at which the change has occurred.- Overrides:
queueVariable
in classConstraint
- Parameters:
level
- the level of the store at which the change has occurred.variable
- variable which has changed.
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