Package org.tweetyproject.lp.asp.syntax

Class OptimizationStatement

java.lang.Object

org.tweetyproject.lp.asp.syntax.ASPElement

org.tweetyproject.lp.asp.syntax.ASPBodyElement

org.tweetyproject.lp.asp.syntax.OptimizationStatement

All Implemented Interfaces:

Formula, ComplexLogicalFormula, LogicStructure, SimpleLogicalFormula

public class OptimizationStatement
extends ASPBodyElement

This class represents an optimization statement. Optimization statements represent sets of weak constraints with the goal of finding an optimal answer set wrt. to the constraints.

Author:

Anna Gessler

Constructor Summary

Constructors

Constructor	Description
OptimizationStatement(ASPOperator.OptimizeFunction function)	Creates a new empty OptimizatonStatement with the given function.
OptimizationStatement(ASPOperator.OptimizeFunction function, List<OptimizationElement> optElements)	Creates a new empty OptimizatonStatement with the given function and the given optimization elements (term-literal tuples with weight and priority).
OptimizationStatement(ASPOperator.OptimizeFunction function, Term<?> weight, int priority, List<Term<?>> terms, List<ASPBodyElement> literals)	Creates a new OptimizatonStatement with the given function, weight, priority and single term-literal tuple.
OptimizationStatement(ASPOperator.OptimizeFunction function, Term<?> weight, List<Term<?>> terms, List<ASPBodyElement> literals)	Creates a new OptimizatonStatement with the given function, weight and single term-literal tuple.
OptimizationStatement(ASPOperator.OptimizeFunction function, OptimizationElement element)	Creates a new OptimizatonStatement with the given function and single term-literal tuple.

Method Summary

Modifier and Type	Method	Description
OptimizationStatement	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
List<OptimizationElement>	getElements()	Return the optimization elements of this optimization statement
SortedSet<ASPLiteral>	getLiterals()	Returns all literals in this element in form of a SortedSet.
ASPOperator.OptimizeFunction	getOptimizeFunction()	Return the optimize function of this optimization statement
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	printToClingo()	Returns a representation of this ASP element in clingo (potassco) syntax.
void	setElements(List<OptimizationElement> elements)	Sets the optimization elements of this optimization statement.
void	setOptimizeFunction(ASPOperator.OptimizeFunction function)	Sets the optimization function.
OptimizationStatement	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, printToDLV, substitute

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Details

OptimizationStatement

public OptimizationStatement(ASPOperator.OptimizeFunction function)

Creates a new empty OptimizatonStatement with the given function.

Parameters:

function - the function

OptimizationStatement

public OptimizationStatement(ASPOperator.OptimizeFunction function,
 List<OptimizationElement> optElements)

Creates a new empty OptimizatonStatement with the given function and the given optimization elements (term-literal tuples with weight and priority).

Parameters:

function - the function

optElements - list of OptimizationElements

OptimizationStatement

public OptimizationStatement(ASPOperator.OptimizeFunction function,
 Term<?> weight,
 List<Term<?>> terms,
 List<ASPBodyElement> literals)

Creates a new OptimizatonStatement with the given function, weight and single term-literal tuple.

Parameters:

function - function

weight - weight

terms - terms

literals - literals

OptimizationStatement

public OptimizationStatement(ASPOperator.OptimizeFunction function,
 Term<?> weight,
 int priority,
 List<Term<?>> terms,
 List<ASPBodyElement> literals)

Creates a new OptimizatonStatement with the given function, weight, priority and single term-literal tuple.

Parameters:

function - function

weight - weight

priority - priority

terms - terms

literals - literals

OptimizationStatement

public OptimizationStatement(ASPOperator.OptimizeFunction function,
 OptimizationElement element)

Creates a new OptimizatonStatement with the given function and single term-literal tuple.

Parameters:

function - the target function

element - some element

Method Details

setElements

public void setElements(List<OptimizationElement> elements)

Sets the optimization elements of this optimization statement.

Parameters:

elements - the optimization elements

getElements

public List<OptimizationElement> getElements()

Return the optimization elements of this optimization statement

Returns:

the optimization elements of this optimization statement

getOptimizeFunction

public ASPOperator.OptimizeFunction getOptimizeFunction()

Return the optimize function of this optimization statement

Returns:

the optimize function of this optimization statement

setOptimizeFunction

public void setOptimizeFunction(ASPOperator.OptimizeFunction function)

Sets the optimization function.

Parameters:

function - function

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

substitute

public OptimizationStatement 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 ASPBodyElement

Parameters:

t - the term to be substituted.

v - the term to substitute.

Returns:

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

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

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 OptimizationStatement 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()

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

toString

public String toString()

Overrides:

toString in class Object

printToClingo

public String printToClingo()

Description copied from class: ASPElement

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

Overrides:

printToClingo in class ASPElement

Returns:

String representation in clingo 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