Sat4jSolver

java.lang.Object
- org.tweetyproject.logics.pl.sat.SatSolver
- - org.tweetyproject.logics.pl.sat.Sat4jSolver

All Implemented Interfaces:

BeliefSetConsistencyTester<PlFormula>, ConsistencyTester<BeliefSet<PlFormula,?>>, ConsistencyWitnessProvider<PlBeliefSet,PlFormula>
```
public class Sat4jSolver
extends SatSolver
```
Uses the Sat4j library for SAT solving (note that currently only the light version is used).

Author:

Matthias Thimm

Constructor Summary

Constructors
Constructor	Description
`Sat4jSolver()`	Creates a new solver with default parameters (maxvar=1000000, nbclauses=500000).
`Sat4jSolver(int maxvar, int nbclauses)`	Creates a new solver with the given parameters.

Method Summary

Modifier and Type	Method	Description
`Interpretation<PlBeliefSet,PlFormula>`	`getWitness(java.util.Collection<PlFormula> formulas)`	If the collection of formulas is consistent this method returns some model of it or, if it is inconsistent, null.
`boolean`	`isSatisfiable(java.util.Collection<PlFormula> formulas)`	Checks whether the given set of formulas is satisfiable.

Methods inherited from class org.tweetyproject.logics.pl.sat.SatSolver
convertToDimacs, convertToDimacs, getDefaultSolver, getWitness, getWitness, hasDefaultSolver, isConsistent, isConsistent, isConsistent, setDefaultSolver, setTempFolder

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Sat4jSolver
```
public Sat4jSolver(int maxvar,
                   int nbclauses)
```
    Creates a new solver with the given parameters.
    
    Parameters:
    
    maxvar - Max number of variables for this solver.
    
    nbclauses - Max number of expected clauses for this solver.
  - Sat4jSolver
```
public Sat4jSolver()
```
    Creates a new solver with default parameters (maxvar=1000000, nbclauses=500000).
- Method Detail
  - isSatisfiable
```
public boolean isSatisfiable(java.util.Collection<PlFormula> formulas)
```
    Description copied from class: SatSolver
    
    Checks whether the given set of formulas is satisfiable.
    
    Specified by:
    
    isSatisfiable in class SatSolver
    
    Parameters:
    
    formulas - a set of formulas.
    
    Returns:
    
    "true" if the set is consistent.
  - getWitness
```
public Interpretation<PlBeliefSet,PlFormula> getWitness(java.util.Collection<PlFormula> formulas)
```
    Description copied from class: SatSolver
    
    If the collection of formulas is consistent this method returns some model of it or, if it is inconsistent, null.
    
    Specified by:
    
    getWitness in interface ConsistencyWitnessProvider<PlBeliefSet,PlFormula>
    
    Specified by:
    
    getWitness in class SatSolver
    
    Parameters:
    
    formulas - a set of formulas
    
    Returns:
    
    some model of the formulas or null.