Package org.jacop.constraints.table
Class Table
- 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.table.Table
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- All Implemented Interfaces:
Stateful
,UsesQueueVariable
public class Table extends Constraint implements UsesQueueVariable, Stateful
Table 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:
- 4.7
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Field Summary
Fields Modifier and Type Field Description (package private) static boolean
debug
(package private) static java.util.concurrent.atomic.AtomicInteger
idNumber
(package private) int
noNoGround
(package private) ReversibleSparseBitSet
rbs
Main data structure for the constraint(package private) java.util.Map<java.lang.Integer,java.lang.Integer>[]
residues
(package private) Store
store
(package private) java.util.Map<java.lang.Integer,long[]>[]
supports
Data specifying support tuples for each variable; static structure created once when constraint is posed.int[][]
tuple
Tuples specifying the allowed values(package private) java.util.Set<IntVar>
variableQueue
(package private) java.util.Map<IntVar,java.lang.Integer>
varMap
IntVar[]
x
Variables within the scope of table constraint-
Fields inherited from class org.jacop.constraints.Constraint
atomicExecution, consistencyPruningEvents, constraintScope, earlyTerminationOK, increaseWeight, numberId, scope, trace
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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.(package private) void
filterDomains()
int
getDefaultConsistencyPruningEvent()
void
impose(Store store)
It imposes the constraint in a given store.(package private) long[]
makeSupportAndWords(int nw)
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.private void
setBit(int n, long[] a)
java.lang.String
toString()
It produces a string representation of a constraint state.(package private) void
updateTable(java.util.Set<IntVar> fdvs)
private boolean
validTuple(int index)
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Methods inherited from class org.jacop.constraints.Constraint
afc, arguments, cleanAfterFailure, decompose, getConsistencyPruningEvent, getGuideConstraint, getGuideValue, getGuideVariable, grounded, grounded, id, impose, imposeDecomposition, increaseWeight, intArrayToString, numberArgs, removeConstraint, requiresMonotonicity, setConsistencyPruningEvent, setConstraintScope, setScope, setScope, setScope, setScope, setScope, setWatchedVariableGrounded, supplyGuideFeedback, 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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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.jacop.api.Stateful
isStateful
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Field Detail
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store
Store store
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x
public IntVar[] x
Variables within the scope of table constraint
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tuple
public int[][] tuple
Tuples specifying the allowed values
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varMap
java.util.Map<IntVar,java.lang.Integer> varMap
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rbs
ReversibleSparseBitSet rbs
Main data structure for the constraint
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supports
java.util.Map<java.lang.Integer,long[]>[] supports
Data specifying support tuples for each variable; static structure created once when constraint is posed.
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residues
java.util.Map<java.lang.Integer,java.lang.Integer>[] residues
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variableQueue
java.util.Set<IntVar> variableQueue
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noNoGround
int noNoGround
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idNumber
static java.util.concurrent.atomic.AtomicInteger idNumber
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debug
static final boolean debug
- See Also:
- Constant Field Values
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Constructor Detail
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Table
public Table(IntVar[] list, int[][] tuples)
It constructs a table constraint.- Parameters:
list
- the variables in the scope of the constraint.tuples
- the tuples which define alloed values.
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Table
public Table(IntVar[] list, int[][] tuples, boolean reuseTuplesArgument)
It constructs a table constraint.- Parameters:
list
- the variables in the scope of the constraint.tuples
- the tuples which define alloed values.reuseTuplesArgument
- specifies if the table of tuples should be used directly without copying.
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Method Detail
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makeSupportAndWords
long[] makeSupportAndWords(int nw)
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setBit
private void setBit(int n, long[] a)
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validTuple
private boolean validTuple(int index)
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getDefaultConsistencyPruningEvent
public int getDefaultConsistencyPruningEvent()
- Specified by:
getDefaultConsistencyPruningEvent
in classConstraint
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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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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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updateTable
void updateTable(java.util.Set<IntVar> fdvs)
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filterDomains
void filterDomains()
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queueVariable
public void queueVariable(int level, Var v)
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.
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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
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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