Package org.tweetyproject.logics.fol.reasoner

Class Prover9FolReasoner

java.lang.Object

org.tweetyproject.logics.fol.reasoner.FolReasoner

org.tweetyproject.logics.fol.reasoner.Prover9FolReasoner

All Implemented Interfaces:

QualitativeReasoner<FolBeliefSet,FolFormula>, Reasoner<Boolean,FolBeliefSet,FolFormula>

public class Prover9FolReasoner
extends FolReasoner

Invokes Prover9 ( https://www.cs.unm.edu/~mccune/mace4/), an automated theorem prover for first-order logic, and returns its results.

Author:

Nils Geilen, Matthias Thimm

Field Summary

Fields inherited from class org.tweetyproject.logics.fol.reasoner.FolReasoner

defaultReasoner

Constructor Summary

Constructors

Constructor	Description
Prover9FolReasoner(String binaryLocation)	Constructs a new instance pointing to a specific Prover9
Prover9FolReasoner(String binaryLocation, Shell bash)	Constructs a new instance pointing to a specific Prover9.

Method Summary

Modifier and Type	Method	Description
boolean	equivalent(FolBeliefSet kb, FolFormula a, FolFormula b)	This method determines whether two formulas are equivalent wrt.
String	getBinaryLocation()	Return the path of the Prover9 binaries.
boolean	isInstalled()	Checks whether the underlying solver or reasoning mechanism used by this reasoner is installed and available for use.
Boolean	query(FolBeliefSet kb, FolFormula query)	Queries the given belief base with the provided formula and returns a boolean result.
void	setBinaryLocation(String binaryLocation)	Changes the path of the Prover9 binaries.

Methods inherited from class org.tweetyproject.logics.fol.reasoner.FolReasoner

getDefaultReasoner, setDefaultReasoner

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Prover9FolReasoner

public Prover9FolReasoner(String binaryLocation,
 Shell bash)

Constructs a new instance pointing to a specific Prover9.

Parameters:

binaryLocation - of the prover9 executable on the hard drive

bash - shell to run commands

Prover9FolReasoner

public Prover9FolReasoner(String binaryLocation)

Constructs a new instance pointing to a specific Prover9

Parameters:

binaryLocation - of the prover9 executable on the hard drive

Method Details

query

public Boolean query(FolBeliefSet kb,
 FolFormula query)

Description copied from interface: QualitativeReasoner

Queries the given belief base with the provided formula and returns a boolean result. The result indicates whether the formula is entailed or satisfied by the belief base according to the qualitative reasoning method implemented by the reasoner.

Specified by:

query in interface QualitativeReasoner<FolBeliefSet,FolFormula>

Specified by:

query in interface Reasoner<Boolean,FolBeliefSet,FolFormula>

Specified by:

query in class FolReasoner

Parameters:

kb - The belief base to be queried.

query - The formula for which the query is made.

Returns:

`TRUE` if the formula is entailed or satisfied by the belief base, `FALSE` otherwise.

equivalent

public boolean equivalent(FolBeliefSet kb,
 FolFormula a,
 FolFormula b)

Description copied from class: FolReasoner

This method determines whether two formulas are equivalent wrt. to the given knowledge base.

Specified by:

equivalent in class FolReasoner

Parameters:

kb - the knowledge base

a - the first formula.

b - the second formula.

Returns:

the answer to the query.

getBinaryLocation

public String getBinaryLocation()

Return the path of the Prover9 binaries.

Returns:

the path of the Prover9 binaries.

setBinaryLocation

public void setBinaryLocation(String binaryLocation)

Changes the path of the Prover9 binaries.

Parameters:

binaryLocation - the new path of the binary

isInstalled

public boolean isInstalled()

Description copied from interface: QualitativeReasoner

Checks whether the underlying solver or reasoning mechanism used by this reasoner is installed and available for use. This can be helpful when the reasoner depends on external tools or libraries for performing the reasoning tasks.

Returns:

`true` if the solver is installed and available, `false` otherwise.