Package org.tweetyproject.logics.rdl.reasoner

Class SimpleDefaultReasoner

java.lang.Object

org.tweetyproject.logics.rdl.reasoner.SimpleDefaultReasoner

All Implemented Interfaces:

ModelProvider<FolFormula,DefaultTheory,Extension>, QualitativeReasoner<DefaultTheory,FolFormula>, Reasoner<Boolean,DefaultTheory,FolFormula>

public class SimpleDefaultReasoner
extends Object
implements QualitativeReasoner<DefaultTheory,FolFormula>, ModelProvider<FolFormula,DefaultTheory,Extension>

Implements a naive reasoner for default logic based on exhaustive application of defaults in process trees.

Author:

Matthias Thimm, Nils Geilen

Constructor Summary

Constructors

Constructor	Description
SimpleDefaultReasoner()	Defaul Constructor

Method Summary

Modifier and Type	Method	Description
Extension	getModel(DefaultTheory bbase)	Returns a single (dedicated) model of the given belief base.
Collection<Extension>	getModels(DefaultTheory bbase)	Returns a characterizing model of the given belief base
boolean	isInstalled()	Checks whether the underlying solver or reasoning mechanism used by this reasoner is installed and available for use.
Boolean	query(DefaultTheory theory, FolFormula query)	Queries the given belief base with the provided formula and returns a boolean result.
Boolean	query(DefaultTheory theory, FolFormula query, InferenceMode inferenceMode)	Queries the given default theory for the given query using the given inference mode.

Methods inherited from class java.lang.Object

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

Constructor Details

SimpleDefaultReasoner

public SimpleDefaultReasoner()

Defaul Constructor

Method Details

getModels

public Collection<Extension> getModels(DefaultTheory bbase)

Description copied from interface: ModelProvider

Returns a characterizing model of the given belief base

Specified by:

getModels in interface ModelProvider<FolFormula,DefaultTheory,Extension>

Parameters:

bbase - some belief base

Returns:

the (selected) models of the belief base

getModel

public Extension getModel(DefaultTheory bbase)

Description copied from interface: ModelProvider

Returns a single (dedicated) model of the given belief base. If the implemented method allows for more than one dedicated model, the selection may be non-deterministic.

Specified by:

getModel in interface ModelProvider<FolFormula,DefaultTheory,Extension>

Parameters:

bbase - some belief base

Returns:

a selected model of the belief base.

query

public Boolean query(DefaultTheory theory,
 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<DefaultTheory,FolFormula>

Specified by:

query in interface Reasoner<Boolean,DefaultTheory,FolFormula>

Parameters:

theory - 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.

query

public Boolean query(DefaultTheory theory,
 FolFormula query,
 InferenceMode inferenceMode)

Queries the given default theory for the given query using the given inference mode.

Parameters:

theory - a default theory

query - a formula

inferenceMode - either InferenceMode.SKEPTICAL or InferenceMode.CREDULOUS

Returns:

"true" if the formula is accepted

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.

Specified by:

isInstalled in interface QualitativeReasoner<DefaultTheory,FolFormula>

Returns:

`true` if the solver is installed and available, `false` otherwise.