net.sf.tweety.logics.fol.reasoner

Class SpassFolReasoner

java.lang.Object

net.sf.tweety.logics.fol.reasoner.FolReasoner

net.sf.tweety.logics.fol.reasoner.SpassFolReasoner

All Implemented Interfaces:

net.sf.tweety.commons.QualitativeReasoner<FolBeliefSet,FolFormula>, net.sf.tweety.commons.Reasoner<Boolean,FolBeliefSet,FolFormula>

public class SpassFolReasoner
extends FolReasoner

Invokes SPASS (http://www.mpi-inf.mpg.de/departments/automation-of-logic/software/spass-workbench/), an automated theorem prover for first-order logic, modal logic and description logics.

Author:

Anna Gessler

Field Summary

Fields inherited from class net.sf.tweety.logics.fol.reasoner.FolReasoner

defaultReasoner

Constructor Summary

Constructors

Constructor and Description
SpassFolReasoner(String binaryLocation) Constructs a new instance pointing to a specific SPASS
SpassFolReasoner(String binaryLocation, net.sf.tweety.commons.util.Shell bash) Constructs a new instance pointing to a specific SPASS Prover.

Method Summary

Modifier and Type	Method and Description
boolean	equivalent(FolBeliefSet kb, FolFormula a, FolFormula b) This method determines whether two formulas are equivalent wrt.
Boolean	query(FolBeliefSet kb, FolFormula query)
String	queryProof(FolBeliefSet kb, net.sf.tweety.commons.Formula query) Determines the answer wrt.
void	setCmdOptions(String s) Sets the command line options that will be used by SPASS when executing the query.

Methods inherited from class net.sf.tweety.logics.fol.reasoner.FolReasoner

getDefaultReasoner, setDefaultReasoner

Methods inherited from class java.lang.Object

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

Constructor Detail

SpassFolReasoner

public SpassFolReasoner(String binaryLocation,
                        net.sf.tweety.commons.util.Shell bash)

Constructs a new instance pointing to a specific SPASS Prover.

Parameters:

binaryLocation - of the SPASS executable on the hard drive

bash - shell to run commands

SpassFolReasoner

public SpassFolReasoner(String binaryLocation)

Constructs a new instance pointing to a specific SPASS

Parameters:

binaryLocation - of the SPASS executable on the hard drive

Method Detail

setCmdOptions

public void setCmdOptions(String s)

Sets the command line options that will be used by SPASS when executing the query.

Parameters:

s - a string containing the command line arguments

query

public Boolean query(FolBeliefSet kb,
                     FolFormula query)

Specified by:

query in interface net.sf.tweety.commons.QualitativeReasoner<FolBeliefSet,FolFormula>

Specified by:

query in interface net.sf.tweety.commons.Reasoner<Boolean,FolBeliefSet,FolFormula>

Specified by:

query in class FolReasoner

queryProof

public String queryProof(FolBeliefSet kb,
                         net.sf.tweety.commons.Formula query)

Determines the answer wrt. to the given query and returns the proof (if applicable). May decrease SPASS's performance, use net.sf.tweety.logics.SpassFolReasoner.reasoner.SPASS#query(Formula) if only a yes/no result is needed.

Parameters:

query - a formula

Returns:

a string containing proof documentation

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.