Package org.tweetyproject.logics.dl.syntax

Class ExistentialRestriction

java.lang.Object

org.tweetyproject.logics.dl.syntax.ComplexConcept

org.tweetyproject.logics.dl.syntax.ExistentialRestriction

All Implemented Interfaces:

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

public class ExistentialRestriction
extends ComplexConcept

This class models an existential restriction in description logics, i.e. an expression of the form "exists R.C" for a role R and a concept C.

Author:

Anna Gessler

Constructor Summary

Constructors

Constructor	Description
ExistentialRestriction(Pair<AtomicRole,ComplexConcept> f)
ExistentialRestriction(AtomicRole r, ComplexConcept c)	Creates a new ALC existential restriction with the given role and concept.

Method Summary

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

Methods inherited from class org.tweetyproject.logics.dl.syntax.ComplexConcept

combineWithAnd, combineWithOr, complement, getAtoms, getPredicateCls, getUniformProbability

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Details

ExistentialRestriction

public ExistentialRestriction(AtomicRole r,
 ComplexConcept c)

Creates a new ALC existential restriction with the given role and concept.

Parameters:

r - the role

c - the concept that is being restricted by the role

ExistentialRestriction

public ExistentialRestriction(Pair<AtomicRole,ComplexConcept> f)

Method Details

getFormulas

public Pair<AtomicRole,ComplexConcept> getFormulas()

Returns:

the (atomic) role and the concept that are part of the existential restriction.

getRole

public AtomicRole getRole()

Returns:

the (atomic) role of the existential restriction.

getConcept

public ComplexConcept getConcept()

Returns:

the concept of the existential restriction.

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.

toString

public String toString()

Overrides:

toString in class Object

getPredicates

public 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

isLiteral

public boolean isLiteral()

Returns:

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

clone

public ComplexConcept 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

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.

hashCode

public int hashCode()

Specified by:

hashCode in interface SimpleLogicalFormula

Specified by:

hashCode in class ComplexConcept

equals

public boolean equals(Object obj)

Specified by:

equals in interface SimpleLogicalFormula

Specified by:

equals in class ComplexConcept