net.sf.tweety.arg.delp.semantics

Class GeneralizedSpecificity

java.lang.Object

net.sf.tweety.arg.delp.semantics.ComparisonCriterion

net.sf.tweety.arg.delp.semantics.GeneralizedSpecificity

public final class GeneralizedSpecificity
extends ComparisonCriterion

This class implements the generalized specificity criterion used to compare two arguments. Using this criterion, an argument is more specific (better) than another argument if the former uses more facts or less rules.

See

[1] Stolzenburg, F. and Garcia, A. and Chesnevar, Carlos I. and Simari, Guillermo R.. Computing Generalized Specificity. In Journal of Non-Classical Logics, 2003. Volume 13(1):87-113.

for more information.

Author:

Matthias Thimm

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	GeneralizedSpecificity.ActSetType

Nested classes/interfaces inherited from class net.sf.tweety.arg.delp.semantics.ComparisonCriterion

ComparisonCriterion.Factory, ComparisonCriterion.Result

Constructor Summary

Constructors

Constructor and Description
GeneralizedSpecificity()

Method Summary

Modifier and Type	Method and Description
private boolean	actSetTest(java.util.Set<java.util.Set<FolFormula>> ntActSets, DelpArgument arg, DefeasibleLogicProgram delp) Test whether all given activation sets activate the given argument.
ComparisonCriterion.Result	compare(DelpArgument argument1, DelpArgument argument2, DefeasibleLogicProgram context) This method returns the relation of argument1 to argument2 given context.
private boolean	isActivated(DelpArgument arg, java.util.Set<FolFormula> activationSet, DefeasibleLogicProgram delp) Test whether the given argument is activated by the given activation set.
private java.util.Set<java.util.Set<FolFormula>>	ntActSets(ArgumentCompletion argument) Computes the activation sets of the given argument completion.
private java.util.Set<java.util.Set<FolFormula>>	ntActSets(java.util.Set<ArgumentCompletion> argumentCompletions) Computes the activation sets of all given argument completions

Methods inherited from class java.lang.Object

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

Constructor Detail

GeneralizedSpecificity

public GeneralizedSpecificity()

Method Detail

compare

public ComparisonCriterion.Result compare(DelpArgument argument1,
                                          DelpArgument argument2,
                                          DefeasibleLogicProgram context)

Description copied from class: ComparisonCriterion

This method returns the relation of argument1 to argument2 given context.

Specified by:

compare in class ComparisonCriterion

Parameters:

argument1 - a DeLP argument

argument2 - a DeLP argument

context - a defeasible logic program as context

Returns:

- Result.IS_BETTER iff argument1 is better than argument2
- Result.IS_WORSE iff argument1 is worse than argument2
- Result.IS_EQUAL iff argument1 and argument2 are in the same equivalence class
- Result.NOT_COMPARABLE iff argument1 and argument2 are not comparable

ntActSets

private java.util.Set<java.util.Set<FolFormula>> ntActSets(ArgumentCompletion argument)

Computes the activation sets of the given argument completion. See [1] for an explanation of the algorithm.

Parameters:

argument - an argument completion

Returns:

the set of activation sets of argument

ntActSets

private java.util.Set<java.util.Set<FolFormula>> ntActSets(java.util.Set<ArgumentCompletion> argumentCompletions)

Computes the activation sets of all given argument completions

Parameters:

argumentCompletions - a set of argument completions

Returns:

the set of all activation sets for all argument completions

actSetTest

private boolean actSetTest(java.util.Set<java.util.Set<FolFormula>> ntActSets,
                           DelpArgument arg,
                           DefeasibleLogicProgram delp)

Test whether all given activation sets activate the given argument.

Parameters:

ntActSets - a set of activation sets

arg - a DeLP argument

delp - a defeasible logic program

Returns:

true iff all activation sets activate the given argument

isActivated

private boolean isActivated(DelpArgument arg,
                            java.util.Set<FolFormula> activationSet,
                            DefeasibleLogicProgram delp)

Test whether the given argument is activated by the given activation set.

Parameters:

arg - a DeLP argument

activationSet - an activation set

delp - a defeasible logic program

Returns:

true iff the argument gets activated by the given activation set