Package net.sf.tweety.logics.dl.syntax

Class BottomConcept

java.lang.Object

net.sf.tweety.logics.dl.syntax.ComplexConcept

net.sf.tweety.logics.dl.syntax.BottomConcept

All Implemented Interfaces:

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

public class BottomConcept
extends ComplexConcept

This class models the bottom concept (empty concept) in description logics. No individual of the domain is an instance of the bottom concept.

Author:

Anna Gessler

Constructor Summary

Constructors

Constructor	Description
BottomConcept()	Creates a new BottomConcept.

Method Summary

Modifier and Type	Method	Description
BottomConcept	clone()	Creates a deep copy of this formula
ComplexConcept	collapseAssociativeFormulas()	This method collapses all associative operations appearing in this term, e.g.
boolean	equals(java.lang.Object obj)
java.util.Set<Predicate>	getPredicates()	Processes the set of all predicates which appear in this formula
DlSignature	getSignature()	Returns the signature of the language of this formula.
int	hashCode()
boolean	isLiteral()
java.lang.String	toString()

Methods inherited from class net.sf.tweety.logics.dl.syntax.ComplexConcept

combineWithAnd, combineWithOr, complement, getAtoms, getPredicateCls, getUniformProbability

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BottomConcept

public BottomConcept()

Creates a new BottomConcept.

Method Detail

collapseAssociativeFormulas

public ComplexConcept collapseAssociativeFormulas()

Description copied from class: ComplexConcept

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

Specified by:

collapseAssociativeFormulas in class ComplexConcept

Returns:

the collapsed formula.

getPredicates

public java.util.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

Specified by:

getPredicates in class ComplexConcept

Returns:

all predicates that appear in this formula

clone

public BottomConcept clone()

Description copied from class: ComplexConcept

Creates a deep copy of this formula

Specified by:

clone in interface SimpleLogicalFormula

Specified by:

clone in class ComplexConcept

Returns:

the cloned formula

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

isLiteral

public boolean isLiteral()

Returns:

true if the formula represents a literal in the language or false otherwise

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface SimpleLogicalFormula

Specified by:

equals in class ComplexConcept

hashCode

public int hashCode()

Specified by:

hashCode in interface SimpleLogicalFormula

Specified by:

hashCode in class ComplexConcept

getSignature

public DlSignature getSignature()

Description copied from interface: Formula

Returns the signature of the language of this formula.

Specified by:

getSignature in interface Formula

Specified by:

getSignature in class ComplexConcept

Returns:

the signature of the language of this formula.