Package org.jacop.constraints
Class ElementVariableFast
java.lang.Object
org.jacop.constraints.DecomposedConstraint<Constraint>
org.jacop.constraints.Constraint
org.jacop.constraints.ElementVariableFast
- All Implemented Interfaces:
SatisfiedPresent
,Stateful
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Field Summary
FieldsModifier and TypeFieldDescription(package private) boolean
(package private) int
(package private) static final AtomicInteger
final IntVar
It specifies variable index within an element constraint list[index - indexOffset] = value.protected final int
It specifies indexOffset within an element constraint list[index - indexOffset] = value.final IntVar[]
It specifies list of variables within an element constraint list[index - indexOffset] = value.final IntVar
It specifies variable value within an element constraint list[index - indexOffset] = value.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
ConstructorsConstructorDescriptionElementVariableFast
(IntVar index, List<? extends IntVar> list, IntVar value) It constructs an element constraint.ElementVariableFast
(IntVar index, List<? extends IntVar> list, IntVar value, int indexOffset) It constructs an element constraint.ElementVariableFast
(IntVar index, IntVar[] list, IntVar value) It constructs an element constraint.ElementVariableFast
(IntVar index, IntVar[] list, IntVar value, int indexOffset) It constructs an element constraint. -
Method Summary
Modifier and TypeMethodDescriptionvoid
consistency
(Store store) It is a (most probably incomplete) consistency function which removes the values from variables domains.private boolean
int
void
It imposes the constraint in a given store.boolean
This function can be overriden by any constraint to specify dynamic conditions (based on the domain of variables at imposition level to decide if it is a stateful constraint.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This function is called in case of the backtrack, so a constraint can clear the queue of changed variables which is no longer valid.boolean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.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, queueVariable, 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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firstConsistencyCheck
boolean firstConsistencyCheck -
firstConsistencyLevel
int firstConsistencyLevel -
index
It specifies variable index within an element constraint list[index - indexOffset] = value. -
value
It specifies variable value within an element constraint list[index - indexOffset] = value. -
indexOffset
protected final int indexOffsetIt specifies indexOffset within an element constraint list[index - indexOffset] = value. -
list
It specifies list of variables within an element constraint list[index - indexOffset] = value. The list is addressed by positive integers (>=1
) if indexOffset is equal to 0.
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Constructor Details
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ElementVariableFast
It constructs an element constraint.- Parameters:
index
- variable indexlist
- list of variables from which an index-th element is takenvalue
- a value of the index-th element from listindexOffset
- shift applied to index variable.
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ElementVariableFast
It constructs an element constraint.- Parameters:
index
- variable indexlist
- list of variables from which an index-th element is takenvalue
- a value of the index-th element from list
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ElementVariableFast
public ElementVariableFast(IntVar index, List<? extends IntVar> list, IntVar value, int indexOffset) It constructs an element constraint.- Parameters:
index
- variable indexlist
- list of variables from which an index-th element is takenvalue
- a value of the index-th element from listindexOffset
- shift applied to index variable.
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ElementVariableFast
It constructs an element constraint.- Parameters:
index
- variable indexlist
- list of variables from which an index-th element is takenvalue
- a value of the index-th element from list
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Method Details
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isStateful
public boolean isStateful()Description copied from interface:Stateful
This function can be overriden by any constraint to specify dynamic conditions (based on the domain of variables at imposition level to decide if it is a stateful constraint.- Specified by:
isStateful
in interfaceStateful
- Returns:
- true if constraint is stateful.
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impose
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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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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disjoint
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getDefaultConsistencyPruningEvent
public int getDefaultConsistencyPruningEvent()- Specified by:
getDefaultConsistencyPruningEvent
in classConstraint
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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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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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