net.sf.tweety.lp.asp.syntax

Class Arithmetic

java.lang.Object

net.sf.tweety.logics.commons.syntax.ComplexLogicalFormulaAdapter

net.sf.tweety.lp.asp.syntax.DLPElementAdapter

net.sf.tweety.lp.asp.syntax.Arithmetic

All Implemented Interfaces:

Formula, ComplexLogicalFormula, LogicStructure, SimpleLogicalFormula, DLPElement

public class Arithmetic
extends DLPElementAdapter
implements DLPElement

This class implements the Arithmetic semantic given by the DLV Manual. Because for build-in functions like #rand a complement is not possible this class does not implement the Invertable interface.

Author:

Tim Janus, Thomas Vengels

Field Summary

Fields

Modifier and Type	Field and Description
private Term<?>	left the term X on the left of an arithmetic expression: Z=X+Y or the first argument of an build-in function #func(X,Y,Z)
private java.lang.String	operator the operator or the id of the build-in function
private Term<?>	result the term Z giving the result of the arithmetic expression: Z=X+Y or the third argument of an build-in function #func(X,Y,Z)
private Term<?>	right the term Y on the right of the arithmetic expression: Z=X+Y or the second argument of an build-in function #func(X,Y,Z)

Constructor Summary

Constructors

Constructor and Description
Arithmetic(Arithmetic other) Copy-Ctor
Arithmetic(java.lang.String op, Term<?> left, Term<?> right, Term<?> result)

Method Summary

Modifier and Type	Method and Description
Arithmetic	clone() Creates a deep copy of this formula
boolean	equals(java.lang.Object other)
java.util.Set<DLPAtom>	getAtoms() Processes the set of all atoms which appear in this formula
Term<?>	getLeftArgument()
java.util.SortedSet<DLPLiteral>	getLiterals()
java.lang.String	getOperator()
java.util.Set<DLPPredicate>	getPredicates() Processes the set of all predicates which appear in this formula
Term<?>	getResult()
Term<?>	getRightArgument()
FolSignature	getSignature() Returns the signature of the language of this formula.
java.util.Set<Term<?>>	getTerms()
int	hashCode()
boolean	isGround() Checks whether this formula is ground, i.e.
Arithmetic	substitute(Term<?> t, Term<?> v) Substitutes all occurrences of term "v" in this formula by term "t" and returns the new formula.
java.lang.String	toString()

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

getPredicateCls

Methods inherited from class net.sf.tweety.logics.commons.syntax.ComplexLogicalFormulaAdapter

containsTermsOfType, exchange, getTerms, isLiteral, isWellFormed, substitute

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.tweety.logics.commons.syntax.interfaces.ComplexLogicalFormula

exchange, isWellFormed, substitute

Methods inherited from interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

getPredicateCls, isLiteral

Methods inherited from interface net.sf.tweety.logics.commons.syntax.interfaces.LogicStructure

containsTermsOfType, getTerms

Field Detail

operator

private java.lang.String operator

the operator or the id of the build-in function

left

private Term<?> left

the term X on the left of an arithmetic expression: Z=X+Y or the first argument of an build-in function #func(X,Y,Z)

right

private Term<?> right

the term Y on the right of the arithmetic expression: Z=X+Y or the second argument of an build-in function #func(X,Y,Z)

result

private Term<?> result

the term Z giving the result of the arithmetic expression: Z=X+Y or the third argument of an build-in function #func(X,Y,Z)

Constructor Detail

Arithmetic

public Arithmetic(java.lang.String op,
                  Term<?> left,
                  Term<?> right,
                  Term<?> result)

Arithmetic

public Arithmetic(Arithmetic other)

Copy-Ctor

Parameters:

other -

Method Detail

getResult

public Term<?> getResult()

Returns:

the term Z giving the result of the arithmetic expression: Z=X+Y or the third argument of an build-in function #func(X,Y,Z)

getLeftArgument

public Term<?> getLeftArgument()

Returns:

the term X on the left of an arithmetic expression: Z=X+Y or the first argument of an build-in function #func(X,Y,Z)

getRightArgument

public Term<?> getRightArgument()

Returns:

the term Y on the right of the arithmetic expression: Z=X+Y or the second argument of an build-in function #func(X,Y,Z)

getOperator

public java.lang.String getOperator()

Returns:

the operator or the id of the build-in function

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getLiterals

public java.util.SortedSet<DLPLiteral> getLiterals()

Specified by:

getLiterals in interface DLPElement

Returns:

all the literals used in the rule element

getTerms

public java.util.Set<Term<?>> getTerms()

Specified by:

getTerms in interface LogicStructure

Returns:

a set containing all terms of this logical structure

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

Overrides:

isGround in class ComplexLogicalFormulaAdapter

Returns:

"true" if this formula is ground.

clone

public Arithmetic 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 interface DLPElement

Specified by:

clone in class DLPElementAdapter

getPredicates

public java.util.Set<DLPPredicate> 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 interface DLPElement

Returns:

all predicates that appear in this formula

getAtoms

public java.util.Set<DLPAtom> 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 interface DLPElement

Returns:

The set of all atoms

substitute

public Arithmetic 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 interface DLPElement

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 interface DLPElement

Returns:

the signature of the language of this formula.

hashCode

public int hashCode()

Specified by:

hashCode in interface SimpleLogicalFormula

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object other)

Specified by:

equals in interface SimpleLogicalFormula

Overrides:

equals in class java.lang.Object