net.sf.tweety.lp.asp.syntax

Class Comparative

java.lang.Object

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

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

net.sf.tweety.lp.asp.syntax.Comparative

All Implemented Interfaces:

Formula, ComplexLogicalFormula, LogicStructure, SimpleLogicalFormula, DLPElement

public class Comparative
extends DLPElementAdapter
implements DLPElement

This class implements comparative predicates as described in the DLV manual.

Author:

Tim Janus, Thomas Vengels

Field Summary

Fields

Modifier and Type	Field and Description
private Term<?>	left
private java.lang.String	operator
private Term<?>	right

Constructor Summary

Constructors

Constructor and Description
Comparative(Comparative other)
Comparative(java.lang.String op, Term<?> lefthand, Term<?> righthand)

Method Summary

Modifier and Type	Method and Description
Comparative	clone() Creates a deep copy of this formula
boolean	equals(java.lang.Object obj)
java.util.Set<DLPAtom>	getAtoms() Processes the set of all atoms which appear in this formula
Term<?>	getLefthand()
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<?>	getRighthand()
FolSignature	getSignature() Returns the signature of the language of this formula.
java.util.Set<Term<?>>	getTerms()
int	hashCode()
Comparative	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, isGround, 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, isGround, 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

left

private Term<?> left

right

private Term<?> right

operator

private java.lang.String operator

Constructor Detail

Comparative

public Comparative(Comparative other)

Comparative

public Comparative(java.lang.String op,
                   Term<?> lefthand,
                   Term<?> righthand)

Method Detail

getLefthand

public Term<?> getLefthand()

getRighthand

public Term<?> getRighthand()

getOperator

public java.lang.String getOperator()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getTerms

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

Specified by:

getTerms in interface LogicStructure

Returns:

a set containing all terms of this logical structure

getLiterals

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

Specified by:

getLiterals in interface DLPElement

Returns:

all the literals used in the rule element

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 Comparative 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.

clone

public Comparative 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

hashCode

public int hashCode()

Specified by:

hashCode in interface SimpleLogicalFormula

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface SimpleLogicalFormula

Overrides:

equals in class java.lang.Object