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:

QualitativeReasoner<ModalBeliefSet,FolFormula>, Reasoner<java.lang.Boolean,ModalBeliefSet,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 SPASSTest.ComplexQueryTest() for examples.

Author:

Anna Gessler, Matthias Thimm

Field Summary

Fields

Modifier and Type	Field and Description
private Shell	bash Shell to run SPASS.
private java.lang.String	binaryLocation String representation of the SPASS path.
private java.lang.String	cmdOptions Command line options that will be used by SPASS when executing the query.

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

defaultReasoner

Constructor Summary

Constructors

Constructor and Description
SPASSModalReasoner(java.lang.String binaryLocation) Constructs a new instance pointing to a specific SPASS
SPASSModalReasoner(java.lang.String binaryLocation, Shell bash) Constructs a new instance pointing to a specific SPASS Prover.

Method Summary

Modifier and Type	Method and Description
private boolean	evaluateResult(java.lang.String output) Evaluates SPASS results.
java.lang.Boolean	query(ModalBeliefSet kb, FolFormula query) Queries the given belief base for the given formula.
java.lang.String	queryProof(ModalBeliefSet kb, Formula query) Determines the answer wrt.
void	setCmdOptions(java.lang.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

Field Detail

binaryLocation

private java.lang.String binaryLocation

String representation of the SPASS path.

bash

private Shell bash

Shell to run SPASS.

cmdOptions

private java.lang.String cmdOptions

Command line options that will be used by SPASS when executing the query. The default value disables most outputs except for the result and enables TPTP input format instead of SPASS input format.

Constructor Detail

SPASSModalReasoner

public SPASSModalReasoner(java.lang.String binaryLocation,
                          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(java.lang.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(java.lang.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 java.lang.Boolean query(ModalBeliefSet kb,
                               FolFormula query)

Description copied from interface: Reasoner

Queries the given belief base for the given formula.

Specified by:

query in interface QualitativeReasoner<ModalBeliefSet,FolFormula>

Specified by:

query in interface Reasoner<java.lang.Boolean,ModalBeliefSet,FolFormula>

Specified by:

query in class AbstractModalReasoner

Parameters:

kb - a belief base

query - a formula

Returns:

the answer to the query

queryProof

public java.lang.String queryProof(ModalBeliefSet kb,
                                   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

evaluateResult

private boolean evaluateResult(java.lang.String output)

Evaluates SPASS results.

Parameters:

output - of a SPASS query

Returns:

true if a proof was found, false otherwise