Package org.tweetyproject.arg.dung.principles

Class DirectionalityPrinciple

java.lang.Object

org.tweetyproject.arg.dung.principles.Principle

org.tweetyproject.arg.dung.principles.DirectionalityPrinciple

All Implemented Interfaces:

Postulate<Argument>

Direct Known Subclasses:

NonInterferencePrinciple, SemiDirectionalityPrinciple, WeakDirectionalityPrinciple

public class DirectionalityPrinciple
extends Principle

Directionality Principle

A semantics satisfies directionality if for every unattacked set 'U' in an AF F it holds that: The extensions of F restricted to 'U' are equal to the extensions of F intersected with 'U'.

Author:

Lars Bengel

See Also:

• "Baroni, P., and Giacomin, M. (2007). On principle-based evaluation of extension-based argumentation semantics."

Field Summary

Fields inherited from class org.tweetyproject.arg.dung.principles.Principle

ADMISSIBILITY, ALLOWING_ABSTENTION, CF_REINSTATEMENT, CONFLICT_FREE, DEFENCE, DIRECTIONALITY, I_MAXIMALITY, INRA, MODULARIZATION, NAIVETY, NON_INTERFERENCE, REDUCT_ADM, REINSTATEMENT, SCC_DECOMPOSABILITY, SCOOC, SEMI_DIRECTIONALITY, SEMIQUAL_ADM, STRONG_ADMISSIBILITY, WEAK_DIRECTIONALITY, WEAK_REINSTATEMENT

Constructor Summary

Constructors

Constructor	Description
DirectionalityPrinciple()

Method Summary

Modifier and Type	Method	Description
String	getName()	The textual name of the postulate
Collection<Extension<DungTheory>>	getUnattackedSets(DungTheory theory)	utility method for calculating unattacked sets in a given theory a set E is unattacked in theory iff there exists no argument a in theory \ E, with a attacks E
boolean	isApplicable(Collection<Argument> kb)	Checks whether the given kb represents a non-trivial instance for this postulate, i.e., whether assumptions of this postulates are satisfied (evaluating an approach on a non-applicable instance always succeeds).
boolean	isSatisfied(Collection<Argument> kb, AbstractExtensionReasoner ev)	Computes whether the given extension reasoner (i.e.

Methods inherited from class org.tweetyproject.arg.dung.principles.Principle

isSatisfied

Methods inherited from class java.lang.Object

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

Constructor Details

DirectionalityPrinciple

public DirectionalityPrinciple()

Method Details

getName

public String getName()

Description copied from interface: Postulate

The textual name of the postulate

Returns:

a string

isApplicable

public boolean isApplicable(Collection<Argument> kb)

Description copied from interface: Postulate

Checks whether the given kb represents a non-trivial instance for this postulate, i.e., whether assumptions of this postulates are satisfied (evaluating an approach on a non-applicable instance always succeeds).

Specified by:

isApplicable in interface Postulate<Argument>

Specified by:

isApplicable in class Principle

Parameters:

kb - some knowledge base

Returns:

true if the knowledge base is a non trivial instance of this postulate.

isSatisfied

public boolean isSatisfied(Collection<Argument> kb,
 AbstractExtensionReasoner ev)

Description copied from class: Principle

Computes whether the given extension reasoner (i.e. semantics) satisfies this principle for this specific instance

Specified by:

isSatisfied in class Principle

Parameters:

kb - some argumentation framework

ev - an extension reasoner

Returns:

true, if this principle is satisfied for this instance and semantics

getUnattackedSets

public Collection<Extension<DungTheory>> getUnattackedSets(DungTheory theory)

utility method for calculating unattacked sets in a given theory a set E is unattacked in theory iff there exists no argument a in theory \ E, with a attacks E

Parameters:

theory - a dung theory

Returns:

the unattacked sets