Package net.sf.tweety.lp.asp.syntax

Class ComparativeAtom

java.lang.Object

net.sf.tweety.lp.asp.syntax.ASPElement

net.sf.tweety.lp.asp.syntax.ASPBodyElement

net.sf.tweety.lp.asp.syntax.ComparativeAtom

All Implemented Interfaces:

net.sf.tweety.commons.Formula, net.sf.tweety.logics.commons.syntax.interfaces.ComplexLogicalFormula, net.sf.tweety.logics.commons.syntax.interfaces.LogicStructure, net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

public class ComparativeAtom
extends ASPBodyElement

This class represents a comparative atom, meaning an expression of the form t x u where t,u are terms and x is in {<, <=, ==, !=, >, >=}. Comparatives are called "Built-in atoms" in the ASP-Core-2 standard.

Author:

Tim Janus, Thomas Vengels, Anna Gessler

Constructor Summary

Constructors

Constructor	Description
ComparativeAtom(ASPOperator.BinaryOperator op, net.sf.tweety.logics.commons.syntax.interfaces.Term<?> left, net.sf.tweety.logics.commons.syntax.interfaces.Term<?> right)
ComparativeAtom(ComparativeAtom other)	Copy-Constructor

Method Summary

Modifier and Type	Method	Description
ASPBodyElement	clone()
boolean	equals(Object obj)
Set<ASPAtom>	getAtoms()
net.sf.tweety.logics.commons.syntax.interfaces.Term<?>	getLeft()	Returns the left (first) term of the comparative atom.
SortedSet<ASPLiteral>	getLiterals()	Returns all literals in this element in form of a SortedSet.
ASPOperator.BinaryOperator	getOperator()	Returns the comparative operator of the atom.
Class<? extends net.sf.tweety.logics.commons.syntax.Predicate>	getPredicateCls()
Set<net.sf.tweety.logics.commons.syntax.Predicate>	getPredicates()
net.sf.tweety.logics.commons.syntax.interfaces.Term<?>	getRight()	Returns the right (second) term of the comparative atom.
net.sf.tweety.logics.fol.syntax.FolSignature	getSignature()
Set<net.sf.tweety.logics.commons.syntax.interfaces.Term<?>>	getTerms()
<C extends net.sf.tweety.logics.commons.syntax.interfaces.Term<?>> Set<C>	getTerms(Class<C> cls)
int	hashCode()
boolean	isLiteral()
ComparativeAtom	substitute(net.sf.tweety.logics.commons.syntax.interfaces.Term<?> t, net.sf.tweety.logics.commons.syntax.interfaces.Term<?> v)
String	toString()

Methods inherited from class net.sf.tweety.lp.asp.syntax.ASPElement

containsTermsOfType, exchange, isGround, isWellFormed, substitute

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ComparativeAtom

public ComparativeAtom(ASPOperator.BinaryOperator op,
                       net.sf.tweety.logics.commons.syntax.interfaces.Term<?> left,
                       net.sf.tweety.logics.commons.syntax.interfaces.Term<?> right)

ComparativeAtom

public ComparativeAtom(ComparativeAtom other)

Copy-Constructor

Parameters:

other - another ComparativeAtom

Method Detail

toString

public String toString()

Overrides:

toString in class Object

getLiterals

public SortedSet<ASPLiteral> getLiterals()

Description copied from class: ASPBodyElement

Returns all literals in this element in form of a SortedSet. Literals are atoms or strict negations of atoms.

Specified by:

getLiterals in class ASPBodyElement

Returns:

all the literals used in the rule element

getPredicates

public Set<net.sf.tweety.logics.commons.syntax.Predicate> getPredicates()

Specified by:

getPredicates in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

Specified by:

getPredicates in class ASPElement

getAtoms

public Set<ASPAtom> getAtoms()

Specified by:

getAtoms in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

Specified by:

getAtoms in class ASPElement

substitute

public ComparativeAtom substitute(net.sf.tweety.logics.commons.syntax.interfaces.Term<?> t,
                                  net.sf.tweety.logics.commons.syntax.interfaces.Term<?> v)

Specified by:

substitute in interface net.sf.tweety.logics.commons.syntax.interfaces.ComplexLogicalFormula

Specified by:

substitute in class ASPBodyElement

getSignature

public net.sf.tweety.logics.fol.syntax.FolSignature getSignature()

Specified by:

getSignature in interface net.sf.tweety.commons.Formula

Specified by:

getSignature in class ASPElement

clone

public ASPBodyElement clone()

Specified by:

clone in interface net.sf.tweety.logics.commons.syntax.interfaces.ComplexLogicalFormula

Specified by:

clone in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

Specified by:

clone in class ASPElement

getPredicateCls

public Class<? extends net.sf.tweety.logics.commons.syntax.Predicate> getPredicateCls()

Specified by:

getPredicateCls in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

Overrides:

getPredicateCls in class ASPElement

isLiteral

public boolean isLiteral()

getTerms

public Set<net.sf.tweety.logics.commons.syntax.interfaces.Term<?>> getTerms()

getOperator

public ASPOperator.BinaryOperator getOperator()

Returns the comparative operator of the atom.

Returns:

the comparative operator of the atom.

getLeft

public net.sf.tweety.logics.commons.syntax.interfaces.Term<?> getLeft()

Returns the left (first) term of the comparative atom.

Returns:

the left (first) term of the comparative atom.

getRight

public net.sf.tweety.logics.commons.syntax.interfaces.Term<?> getRight()

Returns the right (second) term of the comparative atom.

Returns:

the right (second) term of the comparative atom.

getTerms

public <C extends net.sf.tweety.logics.commons.syntax.interfaces.Term<?>> Set<C> getTerms(Class<C> cls)

hashCode

public int hashCode()

Specified by:

hashCode in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Specified by:

equals in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

Overrides:

equals in class Object