Package org.tweetyproject.lp.asp.syntax

Class ASPElement

java.lang.Object

org.tweetyproject.lp.asp.syntax.ASPElement

All Implemented Interfaces:

Formula, ComplexLogicalFormula, LogicStructure, SimpleLogicalFormula

Direct Known Subclasses:

AggregateElement, ASPBodyElement, ASPHead, ASPRule, ChoiceElement, OptimizationElement

public abstract class ASPElement
extends Object
implements ComplexLogicalFormula

This class acts as an abstract base class for elements of ASP rules.

Author:

Anna Gessler

Constructor Summary

Constructors

Constructor	Description
ASPElement()	Default Constructor

Method Summary

Modifier and Type	Method	Description
abstract ASPElement	clone()	Creates a deep copy of this formula
<C extends Term<?>> boolean	containsTermsOfType(Class<C> cls)	Checks if this logical structure contains at least one term of type C.
ASPElement	exchange(Term<?> v, Term<?> t)	Substitutes all occurrences of term "v" in this formula by term "t" and at the same time replaces all occurrences of term "t" by term "v" and eventually returns the new formula.
abstract Set<ASPAtom>	getAtoms()	Processes the set of all atoms which appear in this formula
Class<? extends Predicate>	getPredicateCls()
abstract Set<Predicate>	getPredicates()	Processes the set of all predicates which appear in this formula
abstract FolSignature	getSignature()	Returns the signature of the language of this formula.
boolean	isGround()	Checks whether this formula is ground, i.e.
boolean	isWellFormed()	Checks if this formula is well formed in the logical langauge.
String	printToClingo()	Returns a representation of this ASP element in clingo (potassco) syntax.
String	printToDLV()	Returns a representation of this ASP element in DLV syntax.
ASPElement	substitute(Map<? extends Term<?>,? extends Term<?>> map)	Substitutes all occurrences of all terms "v" in map.keyset() in this formula by map.get(v) and returns the new formula.
abstract ASPElement	substitute(Term<?> t, Term<?> v)	Substitutes all occurrences of term "v" in this formula by term "t" and returns the new formula.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.tweetyproject.logics.commons.syntax.interfaces.LogicStructure

getTerms, getTerms

Methods inherited from interface org.tweetyproject.logics.commons.syntax.interfaces.SimpleLogicalFormula

equals, hashCode, isLiteral

Constructor Details

ASPElement

public ASPElement()

Default Constructor

Method Details

getPredicates

public abstract 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

Returns:

all predicates that appear in this formula

substitute

public abstract ASPElement 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

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 abstract FolSignature getSignature()

Description copied from interface: Formula

Returns the signature of the language of this formula.

Specified by:

getSignature in interface Formula

Returns:

the signature of the language of this formula.

getAtoms

public abstract 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

Returns:

The set of all atoms

clone

public abstract ASPElement 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

Returns:

the cloned formula

substitute

public ASPElement substitute(Map<? extends Term<?>,? extends Term<?>> map)
                      throws IllegalArgumentException

Description copied from interface: ComplexLogicalFormula

Substitutes all occurrences of all terms "v" in map.keyset() in this formula by map.get(v) and returns the new formula.

Specified by:

substitute in interface ComplexLogicalFormula

Parameters:

map - a mapping defining which terms to be substituted.

Returns:

a formula where every term in map.keyset() has been replaced by map.get(v).

Throws:

IllegalArgumentException - if any term and its mapping are of different sorts

exchange

public ASPElement exchange(Term<?> v,
 Term<?> t)
                    throws IllegalArgumentException

Description copied from interface: ComplexLogicalFormula

Substitutes all occurrences of term "v" in this formula by term "t" and at the same time replaces all occurrences of term "t" by term "v" and eventually returns the new formula.

Specified by:

exchange in interface ComplexLogicalFormula

Parameters:

v - a term.

t - a term.

Returns:

a new logical formula with both "v" and "t" exchanged.

Throws:

IllegalArgumentException - if "v" and "t" are of different sorts

containsTermsOfType

public <C extends Term<?>> boolean containsTermsOfType(Class<C> cls)

Description copied from interface: LogicStructure

Checks if this logical structure contains at least one term of type C. This method is a shortcut for !getTerms(TermImplementation.class).isEmpty().

Specified by:

containsTermsOfType in interface LogicStructure

Type Parameters:

C - the type of terms

Parameters:

cls - The class structure representing the type C of the term.

Returns:

True if this logical structure contains at least one term of type C or false otherwise.

isGround

public boolean isGround()

Description copied from interface: ComplexLogicalFormula

Checks whether this formula is ground, i.e. whether there appears no variable in this formula.

Specified by:

isGround in interface ComplexLogicalFormula

Returns:

"true" if this formula is ground.

isWellFormed

public boolean isWellFormed()

Description copied from interface: ComplexLogicalFormula

Checks if this formula is well formed in the logical langauge. What well- formed means is highly language dependent and the documentation of implementing sub classes shall describe the well formed term for the language they model.

Specified by:

isWellFormed in interface ComplexLogicalFormula

Returns:

true if the formula is well-formed, false otherwise

getPredicateCls

public Class<? extends Predicate> getPredicateCls()

Specified by:

getPredicateCls in interface SimpleLogicalFormula

Returns:

The class description of the predicate used by this formula.

printToClingo

public String printToClingo()

Returns a representation of this ASP element in clingo (potassco) syntax. See https://potassco.org/ for more information.

Returns:

String representation in clingo syntax

printToDLV

public String printToDLV()

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

Returns:

String representation in DLV syntax