Package org.tweetyproject.logics.fol.reasoner

Class EFOLReasoner

java.lang.Object

org.tweetyproject.logics.fol.reasoner.FolReasoner

org.tweetyproject.logics.fol.reasoner.EFOLReasoner

All Implemented Interfaces:

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

public class EFOLReasoner
extends FolReasoner

Invokes E (http://eprover.org), an automated theorem prover for first-order logic, and returns its results.

Author:

Bastian Wolf, Nils Geilen, Matthias Thimm

Field Summary

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

defaultReasoner

Constructor Summary

Constructors

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

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	getAdditionalArguments()	Returns the additional arguments given to the call of the EProver binary (Default value is "--auto-schedule").
String	getBinaryLocation()	Return the path of the EProver binary
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	setAdditionalArguments(String s)	Sets the additional arguments given to the call of the EProver binary (Default value is "--auto-schedule").
void	setBinaryLocation(String binaryLocation)	Changes the path of the EProver binary.

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

EFOLReasoner

public EFOLReasoner(String binaryLocation,
 Shell bash)

Constructs a new instance pointing to a specific EProver.

Parameters:

binaryLocation - location of the EProver executable on the hard drive

bash - shell to run commands

EFOLReasoner

public EFOLReasoner(String binaryLocation)

Constructs a new instance pointing to a specific EProver.

Parameters:

binaryLocation - location of the Eprover executable on the hard drive

Method Details

setAdditionalArguments

public void setAdditionalArguments(String s)

Sets the additional arguments given to the call of the EProver binary (Default value is "--auto-schedule").

Parameters:

s - some string

getAdditionalArguments

public String getAdditionalArguments()

Returns the additional arguments given to the call of the EProver binary (Default value is "--auto-schedule").

Returns:

the additional arguments

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 EProver binary

Returns:

the path of the EProver binary

setBinaryLocation

public void setBinaryLocation(String binaryLocation)

Changes the path of the EProver binary.

Parameters:

binaryLocation - the new path of the EProver 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.