Package net.sf.tweety.logics.ml.reasoner

Class SPASSMlReasoner

java.lang.Object

net.sf.tweety.logics.ml.reasoner.AbstractMlReasoner

net.sf.tweety.logics.ml.reasoner.SPASSMlReasoner

All Implemented Interfaces:

QualitativeReasoner<MlBeliefSet,FolFormula>, Reasoner<java.lang.Boolean,MlBeliefSet,FolFormula>

public class SPASSMlReasoner
extends AbstractMlReasoner

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

Modifier and Type	Field	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.AbstractMlReasoner

defaultReasoner

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
private boolean	evaluateResult(java.lang.String output)	Evaluates SPASS results.
java.lang.Boolean	query(MlBeliefSet kb, FolFormula query)	Queries the given belief base for the given formula.
java.lang.String	queryProof(MlBeliefSet 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.AbstractMlReasoner

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

SPASSMlReasoner

public SPASSMlReasoner(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

SPASSMlReasoner

public SPASSMlReasoner(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(MlBeliefSet kb,
                               FolFormula query)

Description copied from interface: Reasoner

Queries the given belief base for the given formula.

Specified by:

query in interface QualitativeReasoner<MlBeliefSet,FolFormula>

Specified by:

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

Specified by:

query in class AbstractMlReasoner

Parameters:

kb - a belief base

query - a formula

Returns:

the answer to the query

queryProof

public java.lang.String queryProof(MlBeliefSet kb,
                                   Formula query)

Determines the answer wrt. to the given query and returns the proof (if applicable). May decrease SPASS's performance, use query(MlBeliefSet,FolFormula) 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