Package org.jacop.constraints
Class ValuePrecede
java.lang.Object
org.jacop.constraints.DecomposedConstraint<Constraint>
org.jacop.constraints.Constraint
org.jacop.constraints.ValuePrecede
- All Implemented Interfaces:
SatisfiedPresent
,Stateful
,UsesQueueVariable
public class ValuePrecede
extends Constraint
implements UsesQueueVariable, Stateful, SatisfiedPresent
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate int
private int
private boolean
private int
(package private) static final AtomicInteger
private int
protected final int
It specifies values s and t for the constraint.(package private) Store
protected final int
private LinkedHashSet<IntVar>
final IntVar[]
It specifies lists of variables for the constraint.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
ConstructorsConstructorDescriptionValuePrecede
(int s, int t, List<IntVar> x) It constructs ValuePrecede.ValuePrecede
(int s, int t, IntVar[] x) It constructs ValuePrecede. -
Method Summary
Modifier and TypeMethodDescriptionprivate void
checkGamma
(int i) void
consistency
(Store store) It is a (most probably incomplete) consistency function which removes the values from variables domains.int
void
It imposes the constraint in a given store.private void
private void
propagate
(int i) 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This function is called in case of the backtrack, so a constraint can clear the queue of changed variables which is no longer valid.boolean
It checks if the constraint is satisfied.toString()
It produces a string representation of a constraint state.private void
Methods inherited from class org.jacop.constraints.Constraint
afc, arguments, cleanAfterFailure, decompose, getConsistencyPruningEvent, 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
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.jacop.api.Stateful
isStateful
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Field Details
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idNumber
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store
Store store -
x
It specifies lists of variables for the constraint. -
n
private int n -
s
protected final int sIt specifies values s and t for the constraint. -
t
protected final int t -
alpha
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beta
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gamma
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alphaValue
private int alphaValue -
betaValue
private int betaValue -
gammaValue
private int gammaValue -
firstConsistencyCheck
private boolean firstConsistencyCheck -
varQueue
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varMap
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Constructor Details
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ValuePrecede
It constructs ValuePrecede.- Parameters:
s
- value occuring firstt
- value occuring nextx
- list of arguments x's.
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ValuePrecede
It constructs ValuePrecede.- Parameters:
s
- value occuring firstt
- value occuring nextx
- list of arguments x's.
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Method Details
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impose
Description copied from class:Constraint
It imposes the constraint in a given store.- Overrides:
impose
in classConstraint
- Parameters:
store
- the constraint store to which the constraint is imposed to.
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getDefaultConsistencyPruningEvent
public int getDefaultConsistencyPruningEvent()- Specified by:
getDefaultConsistencyPruningEvent
in classConstraint
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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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initialize
private void initialize() -
propagate
private void propagate(int i) -
updateBeta
private void updateBeta() -
checkGamma
private void checkGamma(int i) -
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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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.var
- variable which has changed.
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removeLevel
public void removeLevel(int level) Description copied from interface:Stateful
This function is called in case of the backtrack, so a constraint can clear the queue of changed variables which is no longer valid. This function is called *before* all timestamps, variables, mutablevariables have reverted to their previous value.- Specified by:
removeLevel
in interfaceStateful
- Parameters:
level
- the level which is being removed.
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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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