Package org.tweetyproject.logics.dl.syntax

Class ComplexConcept

java.lang.Object

org.tweetyproject.logics.dl.syntax.ComplexConcept

All Implemented Interfaces:

Formula, ClassicalFormula, Conjunctable, Disjunctable, Invertable, ProbabilityAware, SimpleLogicalFormula

Direct Known Subclasses:

AssociativeDlFormula, AtomicConcept, AtomicRole, BottomConcept, Complement, ExistentialRestriction, TopConcept, UniversalRestriction

public abstract class ComplexConcept
extends Object
implements ClassicalFormula

The common abstract class for concepts (also called concepts, complex concepts or concept descriptions) of description logics.
Specifically, this library supports formulas of the description logic ALC (attributive concept language with complements). In an ALC language for a given signature, concepts are:

• All atomic concepts of the signature
• The universal concept
• The bottom concept
• Complex concept descriptions, which are built with the following constructors:
  • The intersection of two concept descriptions
  • The union of two concept descriptions
  • The complement of a concept description
  • The universal restriction of a role by a concept description
  • The existential restriction of a role by a concept description

Author:

Anna Gessler

Constructor Summary

Constructors

Constructor	Description
ComplexConcept()	Default constructor for ComplexConcept.

Method Summary

Modifier and Type	Method	Description
abstract ComplexConcept	clone()	Creates a deep copy of this formula
abstract ComplexConcept	collapseAssociativeFormulas()	This method collapses all associative operations appearing in this term, e.g.
Intersection	combineWithAnd(Conjunctable f)	Returns a conjunction of this and the given formula.
Union	combineWithOr(Disjunctable f)
ComplexConcept	complement()
abstract boolean	equals(Object other)
Set<? extends Atom>	getAtoms()	Processes the set of all atoms which appear in this formula
Class<? extends Predicate>	getPredicateCls()
abstract Set<Predicate>	getPredicates()	Processes the set of all predicates which appear in this formula
abstract DlSignature	getSignature()	Returns the signature of the language of this formula.
Probability	getUniformProbability()
abstract int	hashCode()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.tweetyproject.logics.commons.syntax.interfaces.SimpleLogicalFormula

isLiteral

Constructor Details

ComplexConcept

public ComplexConcept()

Default constructor for ComplexConcept. This constructor initializes a complex concept in description logic. It is meant to be extended by subclasses that implement specific types of complex concepts such as intersections, unions, and complements.

Method Details

complement

public ComplexConcept complement()

Specified by:

complement in interface Invertable

Returns:

the complement of this formula.

combineWithOr

public Union combineWithOr(Disjunctable f)

Specified by:

combineWithOr in interface Disjunctable

Parameters:

f - a formula to be combined with OR and this.

Returns:

a disjunction of this and the given formula.

combineWithAnd

public Intersection combineWithAnd(Conjunctable f)

Description copied from interface: Conjunctable

Returns a conjunction of this and the given formula.

Specified by:

combineWithAnd in interface Conjunctable

Parameters:

f - a formula to be combined with AND and this.

Returns:

a conjunction of this and the given formula.

collapseAssociativeFormulas

public abstract ComplexConcept collapseAssociativeFormulas()

This method collapses all associative operations appearing in this term, e.g. every a||(b||c) becomes a||b||c.

Returns:

the collapsed formula.

clone

public abstract ComplexConcept clone()

Creates a deep copy of this formula

Specified by:

clone in interface SimpleLogicalFormula

Returns:

the cloned formula

getAtoms

public Set<? extends Atom> getAtoms()

Description copied from interface: SimpleLogicalFormula

Processes the set of all atoms which appear in this formula

Specified by:

getAtoms in interface SimpleLogicalFormula

Returns:

The set of all atoms

getPredicateCls

public Class<? extends Predicate> getPredicateCls()

Specified by:

getPredicateCls in interface SimpleLogicalFormula

Returns:

The class description of the predicate used by this formula.

getUniformProbability

public Probability getUniformProbability()

Specified by:

getUniformProbability in interface ProbabilityAware

Returns:

this formula's probability in the uniform distribution.

getSignature

public abstract DlSignature getSignature()

Description copied from interface: Formula

Returns the signature of the language of this formula.

Specified by:

getSignature in interface Formula

Returns:

the signature of the language of this formula.

hashCode

public abstract int hashCode()

Specified by:

hashCode in interface SimpleLogicalFormula

Overrides:

hashCode in class Object

equals

public abstract boolean equals(Object other)

Specified by:

equals in interface SimpleLogicalFormula

Overrides:

equals in class Object

getPredicates

public abstract Set<Predicate> getPredicates()

Description copied from interface: SimpleLogicalFormula

Processes the set of all predicates which appear in this formula

Specified by:

getPredicates in interface SimpleLogicalFormula

Returns:

all predicates that appear in this formula