org.sat4j.pb
Class OPBStringSolver

java.lang.Object
  org.sat4j.tools.DimacsStringSolver
      org.sat4j.pb.OPBStringSolver

All Implemented Interfaces:

Serializable, IPBSolver, IProblem, ISolver

public class OPBStringSolver
extends DimacsStringSolver
implements IPBSolver

Solver used to display in a string the pb-instance in OPB format. That solver is useful to produce OPB files to be used by third party solvers.

Author:

parrain

See Also:

Serialized Form

Constructor Summary

OPBStringSolver()

OPBStringSolver(int initSize)

Method Summary

IConstr	addAtLeast(IVecInt literals, int degree) Create a cardinality constraint of the type "at least n of those literals must be satisfied"
IConstr	addAtMost(IVecInt literals, int degree) Create a cardinality constraint of the type "at most n of those literals must be satisfied"
IConstr	addClause(IVecInt literals) Create a clause from a set of literals The literals are represented by non null integers such that opposite literals a represented by opposite values.
IConstr	addPseudoBoolean(IVecInt lits, IVec<BigInteger> coeffs, boolean moreThan, BigInteger d) Create a Pseudo-Boolean constraint of the type "at least n of those literals must be satisfied"
String	getExplanation()
ObjectiveFunction	getObjectiveFunction()
boolean	isSatisfiable(IVecInt assumps) Check the satisfiability of the set of constraints contained inside the solver.
boolean	isSatisfiable(IVecInt assumps, boolean global) Check the satisfiability of the set of constraints contained inside the solver.
int	newVar(int howmany) Create howmany variables in the solver (and thus in the vocabulary).
void	setExpectedNumberOfClauses(int nb) To inform the solver of the expected number of clauses to read.
void	setListOfVariablesForExplanation(IVecInt listOfVariables)
void	setObjectiveFunction(ObjectiveFunction obj)
String	toString()
String	toString(String prefix) Display a textual representation of the solver configuration.

Methods inherited from class org.sat4j.tools.DimacsStringSolver

addAllClauses, addBlockingClause, clearLearntClauses, expireTimeout, findModel, findModel, getLogPrefix, getOut, getSearchListener, getStat, getTimeout, getTimeoutMs, isDBSimplificationAllowed, isSatisfiable, isSatisfiable, isVerbose, model, model, nConstraints, newVar, nextFreeVarId, nVars, printInfos, printStat, printStat, removeConstr, removeSubsumedConstr, reset, setDBSimplificationAllowed, setLogPrefix, setNbVars, setSearchListener, setTimeout, setTimeoutMs, setTimeoutOnConflicts, setVerbose, unsatExplanation

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.sat4j.specs.ISolver

addAllClauses, addBlockingClause, clearLearntClauses, expireTimeout, getLogPrefix, getSearchListener, getStat, getTimeout, getTimeoutMs, isDBSimplificationAllowed, isVerbose, newVar, nextFreeVarId, printStat, printStat, removeConstr, removeSubsumedConstr, reset, setDBSimplificationAllowed, setLogPrefix, setSearchListener, setTimeout, setTimeoutMs, setTimeoutOnConflicts, setVerbose, unsatExplanation

Methods inherited from interface org.sat4j.specs.IProblem

findModel, findModel, isSatisfiable, isSatisfiable, model, model, nConstraints, nVars, printInfos

Constructor Detail

OPBStringSolver

public OPBStringSolver()

OPBStringSolver

public OPBStringSolver(int initSize)

Parameters:

initSize -

Method Detail

isSatisfiable

public boolean isSatisfiable(IVecInt assumps)
                      throws TimeoutException

Description copied from interface: IProblem

Check the satisfiability of the set of constraints contained inside the solver.

Specified by:

isSatisfiable in interface IProblem

Overrides:

isSatisfiable in class DimacsStringSolver

Parameters:

assumps - a set of literals (represented by usual non null integers in Dimacs format).

Returns:

true if the set of constraints is satisfiable when literals are satisfied, else false.

Throws:

TimeoutException

isSatisfiable

public boolean isSatisfiable(IVecInt assumps,
                             boolean global)
                      throws TimeoutException

Description copied from interface: IProblem

Check the satisfiability of the set of constraints contained inside the solver.

Specified by:

isSatisfiable in interface IProblem

Overrides:

isSatisfiable in class DimacsStringSolver

Parameters:

assumps - a set of literals (represented by usual non null integers in Dimacs format).

global - whether that call is part of a global process (i.e. optimization) or not. if (global), the timeout will not be reset between each call.

Returns:

true if the set of constraints is satisfiable when literals are satisfied, else false.

Throws:

TimeoutException

addPseudoBoolean

public IConstr addPseudoBoolean(IVecInt lits,
                                IVec<BigInteger> coeffs,
                                boolean moreThan,
                                BigInteger d)
                         throws ContradictionException

Description copied from interface: IPBSolver

Create a Pseudo-Boolean constraint of the type "at least n of those literals must be satisfied"

Specified by:

addPseudoBoolean in interface IPBSolver

Parameters:

lits - a set of literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

moreThan - true if it is a constraint >= degree

d - the degree of the cardinality constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the vector of literals is empty or if the constraint is falsified after unit propagation

See Also:

ISolver.removeConstr(IConstr)

setObjectiveFunction

public void setObjectiveFunction(ObjectiveFunction obj)

Specified by:

setObjectiveFunction in interface IPBSolver

addAtLeast

public IConstr addAtLeast(IVecInt literals,
                          int degree)
                   throws ContradictionException

Description copied from interface: ISolver

Create a cardinality constraint of the type "at least n of those literals must be satisfied"

Specified by:

addAtLeast in interface ISolver

Overrides:

addAtLeast in class DimacsStringSolver

Parameters:

literals - a set of literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

degree - the degree of the cardinality constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the vector of literals is empty or if degree literals are not remaining unfalsified after unit propagation

See Also:

ISolver.removeConstr(IConstr)

addAtMost

public IConstr addAtMost(IVecInt literals,
                         int degree)
                  throws ContradictionException

Description copied from interface: ISolver

Create a cardinality constraint of the type "at most n of those literals must be satisfied"

Specified by:

addAtMost in interface ISolver

Overrides:

addAtMost in class DimacsStringSolver

Parameters:

literals - a set of literals The vector can be reused since the solver is not supposed to keep a reference to that vector.

degree - the degree of the cardinality constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the vector of literals is empty or if it contains more than degree satisfied literals after unit propagation

See Also:

ISolver.removeConstr(IConstr)

addClause

public IConstr addClause(IVecInt literals)
                  throws ContradictionException

Description copied from interface: ISolver

Create a clause from a set of literals The literals are represented by non null integers such that opposite literals a represented by opposite values. (classical Dimacs way of representing literals).

Specified by:

addClause in interface ISolver

Overrides:

addClause in class DimacsStringSolver

Parameters:

literals - a set of literals

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the vector of literals is empty or if it contains only falsified literals after unit propagation

See Also:

ISolver.removeConstr(IConstr)

getExplanation

public String getExplanation()

setListOfVariablesForExplanation

public void setListOfVariablesForExplanation(IVecInt listOfVariables)

toString

public String toString()

Overrides:

toString in class DimacsStringSolver

toString

public String toString(String prefix)

Description copied from interface: ISolver

Display a textual representation of the solver configuration.

Specified by:

toString in interface ISolver

Overrides:

toString in class DimacsStringSolver

Parameters:

prefix - the prefix to use on each line.

Returns:

a textual description of the solver internals.

newVar

public int newVar(int howmany)

Description copied from interface: ISolver

Create howmany variables in the solver (and thus in the vocabulary).

Specified by:

newVar in interface ISolver

Overrides:

newVar in class DimacsStringSolver

Parameters:

howmany - number of variables to create

Returns:

the total number of variables available in the solver (the highest variable number)

setExpectedNumberOfClauses

public void setExpectedNumberOfClauses(int nb)

Description copied from interface: ISolver

To inform the solver of the expected number of clauses to read. This is an optional method, that is called when the p cnf line is read in dimacs formatted input file. Note that this method is supposed to be called AFTER a call to newVar(int)

Specified by:

setExpectedNumberOfClauses in interface ISolver

Overrides:

setExpectedNumberOfClauses in class DimacsStringSolver

Parameters:

nb - the expected number of clauses.

See Also:

ISolver.newVar(int)

getObjectiveFunction

public ObjectiveFunction getObjectiveFunction()

Specified by:

getObjectiveFunction in interface IPBSolver