net.sf.tweety.logics.ml.reasoner

Class SPASSModalReasoner

java.lang.Object

net.sf.tweety.logics.ml.reasoner.AbstractModalReasoner

net.sf.tweety.logics.ml.reasoner.SPASSModalReasoner

All Implemented Interfaces:

net.sf.tweety.commons.QualitativeReasoner<ModalBeliefSet,net.sf.tweety.logics.fol.syntax.FolFormula>, net.sf.tweety.commons.Reasoner<Boolean,ModalBeliefSet,net.sf.tweety.logics.fol.syntax.FolFormula>

public class SPASSModalReasoner
extends AbstractModalReasoner

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.
Note: There are unresolved errors for some cases, see net.sf.tweety.logics.ml.SPASSTest#ComplexQueryTest() for examples.

Author:

Anna Gessler, Matthias Thimm

Field Summary

Fields inherited from class net.sf.tweety.logics.ml.reasoner.AbstractModalReasoner

defaultReasoner

Constructor Summary

Constructors

Constructor and Description
SPASSModalReasoner(String binaryLocation) Constructs a new instance pointing to a specific SPASS
SPASSModalReasoner(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	query(ModalBeliefSet kb, net.sf.tweety.logics.fol.syntax.FolFormula query)
String	queryProof(ModalBeliefSet 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.ml.reasoner.AbstractModalReasoner

getDefaultReasoner, setDefaultReasoner

Methods inherited from class java.lang.Object

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

Constructor Detail

SPASSModalReasoner

public SPASSModalReasoner(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

SPASSModalReasoner

public SPASSModalReasoner(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(ModalBeliefSet kb,
                     net.sf.tweety.logics.fol.syntax.FolFormula query)

Specified by:

query in interface net.sf.tweety.commons.QualitativeReasoner<ModalBeliefSet,net.sf.tweety.logics.fol.syntax.FolFormula>

Specified by:

query in interface net.sf.tweety.commons.Reasoner<Boolean,ModalBeliefSet,net.sf.tweety.logics.fol.syntax.FolFormula>

Specified by:

query in class AbstractModalReasoner

queryProof

public String queryProof(ModalBeliefSet 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.ml.reasoner.SPASSModalReasoner#query(Formula) if only a yes/no result is needed.

Parameters:

kb - a modal belief set

query - a formula

Returns:

a string containing proof documentation