org.sat4j.minisat.constraints.pb
Class WatchPb

java.lang.Object
  org.sat4j.minisat.constraints.pb.WatchPb

All Implemented Interfaces:

java.io.Serializable, PBConstr, Constr, Propagatable, Undoable, IConstr

Direct Known Subclasses:

MaxWatchPb, MinWatchPb

public abstract class WatchPb
extends java.lang.Object
implements PBConstr, Undoable, java.io.Serializable

See Also:

Serialized Form

Field Summary

protected double	activity constraint activity
static boolean	ATLEAST constant for the initial type of inequality more than or equal
static boolean	ATMOST constant for the initial type of inequality less than or equal
protected java.math.BigInteger[]	coefs coefficients of the literals of the constraint
protected java.math.BigInteger	degree degree of the pseudo-boolean constraint
protected boolean	learnt true if the constraint is a learned constraint
protected int[]	lits literals of the constraint
protected boolean	locked true if the constraint is the origin of unit propagation
protected ILits	voc constraint's vocabulary
protected java.math.BigInteger	watchCumul sum of the coefficients of the literals satisfied or unvalued

Method Summary

void	assertConstraint(UnitPropagationListener s) Method called when the constraint is to be asserted.
void	calcReason(int p, IVecInt outReason) compute the reason for the assignment of a literal
boolean	coefficientsEqualToOne()
IVecInt	computeAnImpliedClause() compute an implied clause on the literals with the greater coefficients
protected abstract void	computePropagation(UnitPropagationListener s)
protected abstract void	computeWatches()
int	get(int i) to obtain the i-th literal of the constraint
double	getActivity() to obtain the activity value of the constraint
java.math.BigInteger	getCoef(int i) to obtain the coefficient of the i-th literal of the constraint
java.math.BigInteger[]	getCoefs()
java.math.BigInteger	getDegree()
int[]	getLits()
ILits	getVocabulary()
void	incActivity(double claInc) increase activity value of the constraint
boolean	isAssertive(int dl) This predicate tests wether the constraint is assertive at decision level dl
protected boolean	isSatisfiable() D?
boolean	learnt() is the constraint a learnt constrainte ?
boolean	locked() The constraint is the reason of a unit propagation.
static IDataStructurePB	niceCheckedParameters(IVecInt ps, IVec<java.math.BigInteger> bigCoefs, boolean moreThan, java.math.BigInteger bigDeg, ILits voc)
static IDataStructurePB	niceParameters(IVecInt ps, IVec<java.math.BigInteger> bigCoefs, boolean moreThan, java.math.BigInteger bigDeg, ILits voc)
protected static java.math.BigInteger	ppcm(java.math.BigInteger a, java.math.BigInteger b) Calcule le ppcm de deux nombres
java.math.BigInteger	recalcLeftSide() compute the sum of the coefficients of the satisfied or non-assigned literals of the current constraint (usually called poss)
java.math.BigInteger	recalcLeftSide(java.math.BigInteger[] coefs) compute the sum of the coefficients of the satisfied or non-assigned literals of a described constraint (usually called poss)
void	register() Register the constraint to the solver.
void	rescaleBy(double d) Permet le r??????
void	setLearnt() La contrainte est apprise
boolean	simplify() Simplifie la contrainte(l'all???
int	size()
java.math.BigInteger	slackConstraint() compute the slack of the current constraint slack = poss - degree of the constraint
java.math.BigInteger	slackConstraint(java.math.BigInteger[] coefs, java.math.BigInteger degree) compute the slack of a described constraint slack = poss - degree of the constraint
protected void	sort() sort coefficient and literal arrays
protected void	sort(int from, int to) sort partially coefficient and literal arrays
static java.math.BigInteger	toBigInt(int i)
java.lang.String	toString()
static IVec<java.math.BigInteger>	toVecBigInt(IVecInt vec)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.sat4j.minisat.core.Constr

remove

Methods inherited from interface org.sat4j.minisat.core.Propagatable

propagate

Methods inherited from interface org.sat4j.minisat.core.Undoable

undo

Field Detail

ATMOST

public static final boolean ATMOST

constant for the initial type of inequality less than or equal

See Also:

Constant Field Values

ATLEAST

public static final boolean ATLEAST

constant for the initial type of inequality more than or equal

See Also:

Constant Field Values

activity

protected double activity

constraint activity

coefs

protected java.math.BigInteger[] coefs

coefficients of the literals of the constraint

degree

protected java.math.BigInteger degree

degree of the pseudo-boolean constraint

lits

protected int[] lits

literals of the constraint

learnt

protected boolean learnt

true if the constraint is a learned constraint

locked

protected boolean locked

true if the constraint is the origin of unit propagation

watchCumul

protected java.math.BigInteger watchCumul

sum of the coefficients of the literals satisfied or unvalued

voc

protected ILits voc

constraint's vocabulary

Method Detail

isAssertive

public boolean isAssertive(int dl)

This predicate tests wether the constraint is assertive at decision level dl

Parameters:

dl -

Returns:

true iff the constraint is assertive at decision level dl.

calcReason

public void calcReason(int p,
                       IVecInt outReason)

compute the reason for the assignment of a literal

Specified by:

calcReason in interface Constr

Parameters:

p - a falsified literal (or Lit.UNDEFINED)

outReason - list of falsified literals for which the negation is the reason of the assignment

See Also:

Constr.calcReason(int, IVecInt)

computeWatches

protected abstract void computeWatches()
                                throws ContradictionException

Throws:

ContradictionException

computePropagation

protected abstract void computePropagation(UnitPropagationListener s)
                                    throws ContradictionException

Throws:

ContradictionException

get

public int get(int i)

to obtain the i-th literal of the constraint

Specified by:

get in interface IConstr

Parameters:

i - index of the literal

Returns:

the literal

getCoef

public java.math.BigInteger getCoef(int i)

to obtain the coefficient of the i-th literal of the constraint

Specified by:

getCoef in interface PBConstr

Parameters:

i - index of the literal

Returns:

coefficient of the literal

getActivity

public double getActivity()

to obtain the activity value of the constraint

Specified by:

getActivity in interface Constr

Returns:

activity value of the constraint

See Also:

Constr.getActivity()

niceParameters

public static IDataStructurePB niceParameters(IVecInt ps,
                                              IVec<java.math.BigInteger> bigCoefs,
                                              boolean moreThan,
                                              java.math.BigInteger bigDeg,
                                              ILits voc)
                                       throws ContradictionException

Throws:

ContradictionException

niceCheckedParameters

public static IDataStructurePB niceCheckedParameters(IVecInt ps,
                                                     IVec<java.math.BigInteger> bigCoefs,
                                                     boolean moreThan,
                                                     java.math.BigInteger bigDeg,
                                                     ILits voc)

incActivity

public void incActivity(double claInc)

increase activity value of the constraint

Specified by:

incActivity in interface Constr

Parameters:

claInc - the value to increase the activity with

See Also:

Constr.incActivity(double)

slackConstraint

public java.math.BigInteger slackConstraint()

compute the slack of the current constraint slack = poss - degree of the constraint

Returns:

la marge

slackConstraint

public java.math.BigInteger slackConstraint(java.math.BigInteger[] coefs,
                                            java.math.BigInteger degree)

compute the slack of a described constraint slack = poss - degree of the constraint

Parameters:

coefs - coefficients of the constraint

degree - degree of the constraint

Returns:

slack of the constraint

recalcLeftSide

public java.math.BigInteger recalcLeftSide(java.math.BigInteger[] coefs)

compute the sum of the coefficients of the satisfied or non-assigned literals of a described constraint (usually called poss)

Parameters:

coefs - coefficients of the constraint

Returns:

poss

recalcLeftSide

public java.math.BigInteger recalcLeftSide()

compute the sum of the coefficients of the satisfied or non-assigned literals of the current constraint (usually called poss)

Returns:

poss

isSatisfiable

protected boolean isSatisfiable()

D?termine si la contrainte est toujours satisfiable

Returns:

la contrainte est encore satisfiable

learnt

public boolean learnt()

is the constraint a learnt constrainte ?

Specified by:

learnt in interface IConstr

Returns:

true si la contrainte est apprise, false sinon

See Also:

IConstr.learnt()

locked

public boolean locked()

The constraint is the reason of a unit propagation.

Specified by:

locked in interface Constr

Returns:

true

ppcm

protected static java.math.BigInteger ppcm(java.math.BigInteger a,
                                           java.math.BigInteger b)

Calcule le ppcm de deux nombres

Parameters:

a - premier nombre de l'op?ration

b - second nombre de l'op?ration

Returns:

le ppcm en question

rescaleBy

public void rescaleBy(double d)

Permet le r??????chantillonage de l'activit??? de la contrainte

Specified by:

rescaleBy in interface Constr

Parameters:

d - facteur d'ajustement

setLearnt

public void setLearnt()

La contrainte est apprise

Specified by:

setLearnt in interface Constr

simplify

public boolean simplify()

Simplifie la contrainte(l'all???ge)

Specified by:

simplify in interface Constr

Returns:

true si la contrainte est satisfaite, false sinon

size

public int size()

Specified by:

size in interface IConstr

Returns:

the number of literals in the constraint.

sort

protected final void sort()

sort coefficient and literal arrays

sort

protected final void sort(int from,
                          int to)

sort partially coefficient and literal arrays

Parameters:

from - index for the beginning of the sort

to - index for the end of the sort

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

assertConstraint

public void assertConstraint(UnitPropagationListener s)

Description copied from interface: Constr

Method called when the constraint is to be asserted. It means that the constraint was learnt during the search and it should now propagate some truth values. In the clausal case, only one literal should be propagated. In other cases, it might be different.

Specified by:

assertConstraint in interface Constr

Parameters:

s - a UnitPropagationListener to use for unit propagation.

getDegree

public java.math.BigInteger getDegree()

Specified by:

getDegree in interface PBConstr

Returns:

Returns the degree.

register

public void register()

Description copied from interface: Constr

Register the constraint to the solver.

Specified by:

register in interface Constr

toVecBigInt

public static IVec<java.math.BigInteger> toVecBigInt(IVecInt vec)

toBigInt

public static java.math.BigInteger toBigInt(int i)

getCoefs

public java.math.BigInteger[] getCoefs()

Specified by:

getCoefs in interface PBConstr

getLits

public int[] getLits()

Specified by:

getLits in interface PBConstr

getVocabulary

public ILits getVocabulary()

Specified by:

getVocabulary in interface PBConstr

computeAnImpliedClause

public IVecInt computeAnImpliedClause()

compute an implied clause on the literals with the greater coefficients

Specified by:

computeAnImpliedClause in interface PBConstr

coefficientsEqualToOne

public boolean coefficientsEqualToOne()