Package org.tweetyproject.lp.asp.syntax

Class ChoiceElement

java.lang.Object

org.tweetyproject.lp.asp.syntax.ASPElement

org.tweetyproject.lp.asp.syntax.ChoiceElement

All Implemented Interfaces:

Formula, ComplexLogicalFormula, LogicStructure, SimpleLogicalFormula

public class ChoiceElement
extends ASPElement

This class represents an element of a choice atom. Choice elements consist of an atom (required) and a tuple of literals (optional). ChoiceHead

Author:

Anna Gessler

Constructor Summary

Constructors

Constructor	Description
ChoiceElement(ASPLiteral atom)	Create a new choice element with the given atom.
ChoiceElement(ASPLiteral atom, List<ASPBodyElement> elements)	Create a new choice element with the given atom and list of literals.

Method Summary

Modifier and Type	Method	Description
ChoiceElement	clone()	Creates a deep copy of this formula
boolean	equals(Object obj)
Set<ASPAtom>	getAtoms()	Processes the set of all atoms which appear in this formula
SortedSet<ASPLiteral>	getLiterals()	sorted literals
Set<Predicate>	getPredicates()	Processes the set of all predicates which appear in this formula
FolSignature	getSignature()	Returns the signature of the language of this formula.
Set<Term<?>>	getTerms()
<C extends Term<?>> Set<C>	getTerms(Class<C> cls)	Processes the set containing all terms of type C.
int	hashCode()
boolean	isLiteral()
String	printToDLV()	Returns a representation of this ASP element in DLV syntax.
ChoiceElement	substitute(Term<?> t, Term<?> v)	Substitutes all occurrences of term "v" in this formula by term "t" and returns the new formula.
String	toString()

Methods inherited from class org.tweetyproject.lp.asp.syntax.ASPElement

containsTermsOfType, exchange, getPredicateCls, isGround, isWellFormed, printToClingo, substitute

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Details

ChoiceElement

public ChoiceElement(ASPLiteral atom)

Create a new choice element with the given atom.

Parameters:

atom - an ASPLiteral

ChoiceElement

public ChoiceElement(ASPLiteral atom,
 List<ASPBodyElement> elements)

Create a new choice element with the given atom and list of literals.

Parameters:

atom - the atom

elements - list of either ASPAtom, DefaultNegation or ComparativeAtom

Method Details

isLiteral

public boolean isLiteral()

Returns:

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

getTerms

public Set<Term<?>> getTerms()

Returns:

a set containing all terms of this logical structure

getTerms

public <C extends Term<?>> Set<C> getTerms(Class<C> cls)

Description copied from interface: LogicStructure

Processes the set containing all terms of type C. This method uses the equals method of the given Class and therefore does not add terms which are sub classes of type C to the set.

Type Parameters:

C - the type of terms

Parameters:

cls - The Class structure containing type information about the searched term

Returns:

A set containing all terms of type C of this logical structure

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 ASPElement

Returns:

all predicates that appear in this formula

substitute

public ChoiceElement substitute(Term<?> t,
 Term<?> v)

Description copied from interface: ComplexLogicalFormula

Substitutes all occurrences of term "v" in this formula by term "t" and returns the new formula.

Specified by:

substitute in interface ComplexLogicalFormula

Specified by:

substitute in class ASPElement

Parameters:

t - the term to be substituted.

v - the term to substitute.

Returns:

a formula where every occurrence of "v" is replaced by "t".

getSignature

public FolSignature 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 ASPElement

Returns:

the signature of the language of this formula.

getAtoms

public Set<ASPAtom> getAtoms()

Description copied from interface: SimpleLogicalFormula

Processes the set of all atoms which appear in this formula

Specified by:

getAtoms in interface SimpleLogicalFormula

Specified by:

getAtoms in class ASPElement

Returns:

The set of all atoms

clone

public ChoiceElement clone()

Description copied from interface: SimpleLogicalFormula

Creates a deep copy of this formula

Specified by:

clone in interface ComplexLogicalFormula

Specified by:

clone in interface SimpleLogicalFormula

Specified by:

clone in class ASPElement

Returns:

the cloned formula

getLiterals

public SortedSet<ASPLiteral> getLiterals()

sorted literals

Returns:

the literals

toString

public String toString()

Overrides:

toString in class Object

printToDLV

public String printToDLV()

Description copied from class: ASPElement

Returns a representation of this ASP element in DLV syntax. See http://www.dlvsystem.com/html/DLV_User_Manual.html for more information.

Overrides:

printToDLV in class ASPElement

Returns:

String representation in DLV syntax

hashCode

public int hashCode()

Specified by:

hashCode in interface SimpleLogicalFormula

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Specified by:

equals in interface SimpleLogicalFormula

Overrides:

equals in class Object