Package org.jacop.constraints
Class Count
- java.lang.Object
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- org.jacop.constraints.DecomposedConstraint<Constraint>
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- org.jacop.constraints.Constraint
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- org.jacop.constraints.Count
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- All Implemented Interfaces:
SatisfiedPresent
public class Count extends Constraint implements SatisfiedPresent
Count constraint implements the counting over number of occurrences of a given value in a list of variables. The number of occurrences is specified by variable idNumber.- Version:
- 4.7
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Field Summary
Fields Modifier and Type Field Description IntVar
counter
It specifies variable idNumber to count the number of occurences of the specified value in a list.private TimeStamp<java.lang.Integer>
equal
(package private) static java.util.concurrent.atomic.AtomicInteger
idNumber
IntVar[]
list
The list of variables which are checked and counted if equal to specified value.private TimeStamp<java.lang.Integer>
position
int
value
The value to which is any variable is equal to makes the constraint count it.-
Fields inherited from class org.jacop.constraints.Constraint
afcWeight, atomicExecution, consistencyPruningEvents, constraintScope, earlyTerminationOK, increaseWeight, numberId, scope, trace, watchedVariableGrounded
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Fields inherited from class org.jacop.constraints.DecomposedConstraint
queueIndex
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
consistency(Store store)
It is a (most probably incomplete) consistency function which removes the values from variables domains.int
getDefaultConsistencyPruningEvent()
void
impose(Store store)
It imposes the constraint in a given store.boolean
satisfied()
It checks if the constraint is satisfied.private void
swap(int i, int j)
java.lang.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, imposeDecomposition, increaseWeight, intArrayToString, long2int, numberArgs, queueVariable, removeConstraint, requiresMonotonicity, setConsistencyPruningEvent, setConstraintScope, setScope, setScope, setScope, setScope, setScope, setWatchedVariableGrounded, supplyGuideFeedback, toInt, toInt, updateAFC, watchedVariableGrounded
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Methods inherited from class org.jacop.constraints.DecomposedConstraint
auxiliaryVariables, checkInput, checkInput, checkInputForDuplication, checkInputForDuplicationSkipSingletons, checkInputForNullness, checkInputForNullness, checkInputForNullness, derivative, getDubletonsSkipSingletons, imposeDecomposition
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Field Detail
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idNumber
static final java.util.concurrent.atomic.AtomicInteger idNumber
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counter
public final IntVar counter
It specifies variable idNumber to count the number of occurences of the specified value in a list.
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list
public final IntVar[] list
The list of variables which are checked and counted if equal to specified value.
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value
public final int value
The value to which is any variable is equal to makes the constraint count it.
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position
private TimeStamp<java.lang.Integer> position
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equal
private TimeStamp<java.lang.Integer> equal
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Method Detail
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impose
public void impose(Store store)
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
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 classConstraint
- Parameters:
store
- constraint store within which the constraint consistency is being checked.
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swap
private void swap(int i, int j)
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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
public java.lang.String toString()
Description copied from class:Constraint
It produces a string representation of a constraint state.- Overrides:
toString
in classConstraint
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