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

Class DlSignature

java.lang.Object

net.sf.tweety.commons.TripleSetSignature<AtomicConcept,AtomicRole,Individual>

net.sf.tweety.logics.dl.syntax.DlSignature

All Implemented Interfaces:

java.lang.Cloneable, Signature

public class DlSignature
extends TripleSetSignature<AtomicConcept,AtomicRole,Individual>

This class models a description logic signature. A signature for a description logic consists of concept names (unary predicates, e.g. "Male(X)"), role names (binary predicates, e.g. "DaughterOf(X,Y)") and individuals (constants, e.g. "Alice").

Author:

Bastian Wolf, Anna Gessler

Constructor Summary

Constructors

Constructor	Description
DlSignature()	Creates an empty signature.
DlSignature(java.util.Collection<?> c)	Creates a signature with the given objects (individuals, concepts, roles or formulas).
DlSignature(java.util.Set<AtomicConcept> concepts, java.util.Set<AtomicRole> roles, java.util.Set<Individual> individuals)	Creates a signature with the given concept names, role names and individuals.

Method Summary

Modifier and Type	Method	Description
void	add(java.lang.Object obj)	Adds single objects to this signature, iff the object is an appropriate concept, role or individual or a formula.
DlSignature	clone()
boolean	containsConcept(java.lang.String s)	Checks whether the signature contains an atomic concept of the given name.
boolean	containsIndividual(java.lang.String s)	Checks whether the signature contains an Individual of the given name.
boolean	containsRole(java.lang.String s)	Checks whether the signature contains an atomic role of the given name.
AtomicConcept	getConcept(java.lang.String s)	Get the concept with the given name.
java.util.Set<AtomicConcept>	getConcepts()	Get the atomic concepts of the signature.
FolSignature	getCorrespondingFolSignature()	Translates this DlSignature to a FolSignature, i.e.
Individual	getIndividual(java.lang.String s)	Get the individual with the given name.
java.util.Set<Individual>	getIndividuals()	Get the individuals of the signature.
java.util.Set<Predicate>	getPredicates()
AtomicRole	getRole(java.lang.String s)	Get the role with the given name.
java.util.Set<AtomicRole>	getRoles()	Get the role names of the signature.
void	remove(java.lang.Object obj)	Removes the given formula from this signature, if it is present (optional operation).
java.lang.String	toString()	Returns signature as string in the order individuals - concept names - role names.

Methods inherited from class net.sf.tweety.commons.TripleSetSignature

add, addAll, addSignature, clear, equals, hashCode, isEmpty, isOverlappingSignature, isSubSignature, removeAll

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DlSignature

public DlSignature()

Creates an empty signature.

DlSignature

public DlSignature(java.util.Set<AtomicConcept> concepts,
                   java.util.Set<AtomicRole> roles,
                   java.util.Set<Individual> individuals)

Creates a signature with the given concept names, role names and individuals.

Parameters:

concepts - atomic concepts of the signature

roles - atomic roles of the signature

individuals - individuals of the signature

DlSignature

public DlSignature(java.util.Collection<?> c)
            throws java.lang.IllegalArgumentException

Creates a signature with the given objects (individuals, concepts, roles or formulas).

Parameters:

c - a collection of items to be added.

Throws:

java.lang.IllegalArgumentException - if at least one of the given objects is neither an individual, a concept, a role or a formula.

Method Detail

getConcepts

public java.util.Set<AtomicConcept> getConcepts()

Get the atomic concepts of the signature. A concept is an unary (arity 1) predicate.

Returns:

the atomic concepts of the signature

getRoles

public java.util.Set<AtomicRole> getRoles()

Get the role names of the signature. A role is a binary predicate (arity 2) consisting of two individuals.

Returns:

the role names of the signature

getIndividuals

public java.util.Set<Individual> getIndividuals()

Get the individuals of the signature. An individual is a single object similar to objects used in first-order logic.

Returns:

the individuals of the signature

getPredicates

public java.util.Set<Predicate> getPredicates()

Returns:

all predicates of this signature.

getIndividual

public Individual getIndividual(java.lang.String s)

Get the individual with the given name.

Parameters:

s - name of individual

Returns:

the individual with the given name if it is part of the signature, null otherwise

getConcept

public AtomicConcept getConcept(java.lang.String s)

Get the concept with the given name.

Parameters:

s - name of concept

Returns:

the concept with the given name if it is part of the signature, null otherwise

getRole

public AtomicRole getRole(java.lang.String s)

Get the role with the given name.

Parameters:

s - name of role

Returns:

the role with the given name if it is part of the signature, null otherwise

containsIndividual

public boolean containsIndividual(java.lang.String s)

Checks whether the signature contains an Individual of the given name.

Parameters:

s - the name of the Individual

Returns:

true if the the signature contains an Individual of the given name, false otherwise

containsConcept

public boolean containsConcept(java.lang.String s)

Checks whether the signature contains an atomic concept of the given name.

Parameters:

s - the name of the atomic concept

Returns:

true if the the signature contains an atomic concept of the given name, false otherwise

containsRole

public boolean containsRole(java.lang.String s)

Checks whether the signature contains an atomic role of the given name.

Parameters:

s - the name of the atomic role

Returns:

true if the the signature contains a role of the given name, false otherwise

toString

public java.lang.String toString()

Returns signature as string in the order individuals - concept names - role names.

Specified by:

toString in interface Signature

Overrides:

toString in class TripleSetSignature<AtomicConcept,AtomicRole,Individual>

Returns:

a String

getCorrespondingFolSignature

public FolSignature getCorrespondingFolSignature()

Translates this DlSignature to a FolSignature, i.e. concept names and role names are added as predicates and individuals are added as constants.

Returns:

the corresponding FolSignature

add

public void add(java.lang.Object obj)
         throws java.lang.IllegalArgumentException

Adds single objects to this signature, iff the object is an appropriate concept, role or individual or a formula. For a formula (complex concept) all individuals, concepts and roles of this formula are added to the signature.

Parameters:

obj - an object to be added

Throws:

java.lang.IllegalArgumentException - if the object is not an individual, a concept, a role or a DlFormula.

remove

public void remove(java.lang.Object obj)

Description copied from interface: Signature

Removes the given formula from this signature, if it is present (optional operation).

Parameters:

obj - some object

clone

public DlSignature clone()

Specified by:

clone in interface Signature

Specified by:

clone in class TripleSetSignature<AtomicConcept,AtomicRole,Individual>