Package org.jacop.constraints.table
Class SimpleTable
java.lang.Object
org.jacop.constraints.DecomposedConstraint<Constraint>
org.jacop.constraints.Constraint
org.jacop.constraints.table.SimpleTable
- All Implemented Interfaces:
SatisfiedPresent
,Stateful
,UsesQueueVariable
public class SimpleTable
extends Constraint
implements UsesQueueVariable, Stateful, SatisfiedPresent
SimpleTable implements the table constraint using a method presented in
"Compact-Table: Efficient Filtering Table Constraints with Reversible Sparse Bit-Sets" Jordan Demeulenaere, Renaud Hartert, Christophe Lecoutre, Guillaume Perez, Laurent Perron, Jean-Charles ReĢgin, Pierre Schaus. Proc. International Conference on Principles and Practice of Constraint Programming, CP 2016. pp 207-223
- Version:
- 4.10
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Field Summary
FieldsModifier and TypeFieldDescription(package private) static final boolean
(package private) static AtomicInteger
(package private) long
(package private) int
(package private) Store
Data specifying support tuples for each variable; static structure created once when constraint is posed.int[][]
Tuples specifying the allowed valuesMain data structure for the constraintIntVar[]
Variables within the scope of table constraintFields inherited from class org.jacop.constraints.Constraint
atomicExecution, consistencyPruningEvents, constraintScope, earlyTerminationOK, increaseWeight, numberId, scope, trace
Fields inherited from class org.jacop.constraints.DecomposedConstraint
queueIndex
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Constructor Summary
ConstructorsConstructorDescriptionSimpleTable
(IntVar[] list, int[][] tuples) It constructs a table constraint.SimpleTable
(IntVar[] list, int[][] tuples, boolean reuseTupleArguments) It constructs a table constraint. -
Method Summary
Modifier and TypeMethodDescriptionvoid
consistency
(Store store) It is a (most probably incomplete) consistency function which removes the values from variables domains.(package private) void
int
void
It imposes the constraint in a given store.(package private) boolean
void
queueVariable
(int level, Var v) 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This function is called in case of the backtrack, so a constraint can clear the queue of changed variables which is no longer valid.boolean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.(package private) void
updateTable
(Set<IntVar> fdvs) (package private) boolean
validTuple
(int index) 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, 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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store
Store store -
x
Variables within the scope of table constraint -
tuple
public int[][] tupleTuples specifying the allowed values -
words
Main data structure for the constraint -
mask
long mask -
varMap
-
supports
Data specifying support tuples for each variable; static structure created once when constraint is posed. -
variableQueue
-
noNoGround
int noNoGround -
idNumber
-
debug
static final boolean debug- See Also:
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Constructor Details
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SimpleTable
It constructs a table constraint.- Parameters:
list
- the variables in the scope of the constraint.tuples
- the tuples which define alloed values.
-
SimpleTable
It constructs a table constraint.- Parameters:
list
- the variables in the scope of the constraint.tuples
- the tuples which define allowed values.reuseTupleArguments
- specifies if the tuples argument should be used directly without copying.
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-
Method Details
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validTuple
boolean validTuple(int index) -
getDefaultConsistencyPruningEvent
public int getDefaultConsistencyPruningEvent()- Specified by:
getDefaultConsistencyPruningEvent
in classConstraint
-
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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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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updateTable
-
intersectWithMask
boolean intersectWithMask() -
filterDomains
void filterDomains() -
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.v
- variable which has changed.
-
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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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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