Package org.tweetyproject.logics.pl.syntax

Class PlBeliefSet

java.lang.Object

org.tweetyproject.commons.BeliefSet<PlFormula,PlSignature>

org.tweetyproject.logics.pl.syntax.PlBeliefSet

All Implemented Interfaces:

Iterable<PlFormula>, Collection<PlFormula>, BeliefBase

Direct Known Subclasses:

CausalModel, CompilationNode, DeductiveKnowledgeBase, KnowledgeBase

public class PlBeliefSet
extends BeliefSet<PlFormula,PlSignature>

This class represents a knowledge base of propositional formulae.

Author:

Matthias Thimm

Field Summary

Fields inherited from class org.tweetyproject.commons.BeliefSet

EQUALS_USES_SIGNATURE

Constructor Summary

Constructors

Constructor	Description
PlBeliefSet()	Creates a new (empty) knowledge base.
PlBeliefSet(Collection<? extends PlFormula> formulas)	Creates a new knowledge base with the given set of formulas.

Method Summary

Modifier and Type	Method	Description
List<PlFormula>	getCanonicalOrdering()	Force ordering on belief set based on comparison of hash codes.
PlSignature	getMinimalSignature()	Returns the signature of the language of this knowledge base.
Collection<PlBeliefSet>	getSyntaxComponents()	Returns the set of syntax components of this belief set, i.e.
Conjunction	toCnf()	This method returns this belief set in conjunctive normal form (CNF).

Methods inherited from class org.tweetyproject.commons.BeliefSet

add, add, addAll, clear, contains, containsAll, equals, getSignature, hashCode, isEmpty, iterator, remove, removeAll, retainAll, setSignature, size, toArray, toArray, toString, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, spliterator, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Constructor Details

PlBeliefSet

public PlBeliefSet()

Creates a new (empty) knowledge base.

PlBeliefSet

public PlBeliefSet(Collection<? extends PlFormula> formulas)

Creates a new knowledge base with the given set of formulas.

Parameters:

formulas - a set of formulas.

Method Details

toCnf

public Conjunction toCnf()

This method returns this belief set in conjunctive normal form (CNF). A formula is in CNF iff it is a conjunction of disjunctions and in NNF.

Returns:

the formula in CNF.

getSyntaxComponents

public Collection<PlBeliefSet> getSyntaxComponents()

Returns the set of syntax components of this belief set, i.e. a partitioning {K1,...,Kn} of K (a disjoint union K1u...uKn=K) such that the signatures of K1,...,Kn are pairwise disjoint.

Returns:

the set of syntax components of this belief set

getCanonicalOrdering

public List<PlFormula> getCanonicalOrdering()

Force ordering on belief set based on comparison of hash codes.

Returns:

list of "canonically" ordered formulas

See Also:

• PlBeliefSet.PlFormulaHashCodeComparator

getMinimalSignature

public PlSignature getMinimalSignature()

Description copied from interface: BeliefBase

Returns the signature of the language of this knowledge base.

Returns:

the signature of the language of this knowledge base.