java.lang.Object
- net.sf.tweety.lp.asp.syntax.ASPElement
- - net.sf.tweety.lp.asp.syntax.ASPBodyElement
  - - net.sf.tweety.lp.asp.syntax.ComparativeAtom

All Implemented Interfaces:

Formula, ComplexLogicalFormula, LogicStructure, SimpleLogicalFormula
```
public class ComparativeAtom
extends ASPBodyElement
```
This class represents a comparative atom, meaning an expression of the form t x u where t,u are terms and x is in {<, <=, ==, !=, >, >=}. Comparatives are called "Built-in atoms" in the ASP-Core-2 standard.

Author:

Tim Janus, Thomas Vengels, Anna Gessler

Constructor Summary

Constructors
Constructor	Description
`ComparativeAtom(ASPOperator.BinaryOperator op, Term<?> left, Term<?> right)`
`ComparativeAtom(ComparativeAtom other)`	Copy-Constructor

Method Summary

Modifier and Type	Method	Description
`ASPBodyElement`	`clone()`	Creates a deep copy of this formula
`boolean`	`equals(java.lang.Object obj)`
`java.util.Set<ASPAtom>`	`getAtoms()`	Processes the set of all atoms which appear in this formula
`Term<?>`	`getLeft()`	Returns the left (first) term of the comparative atom.
`java.util.SortedSet<ASPLiteral>`	`getLiterals()`	Returns all literals in this element in form of a SortedSet.
`ASPOperator.BinaryOperator`	`getOperator()`	Returns the comparative operator of the atom.
`java.lang.Class<? extends Predicate>`	`getPredicateCls()`
`java.util.Set<Predicate>`	`getPredicates()`	Processes the set of all predicates which appear in this formula
`Term<?>`	`getRight()`	Returns the right (second) term of the comparative atom.
`FolSignature`	`getSignature()`	Returns the signature of the language of this formula.
`java.util.Set<Term<?>>`	`getTerms()`
`<C extends Term<?>> java.util.Set<C>`	`getTerms(java.lang.Class<C> cls)`	Processes the set containing all terms of type C.
`int`	`hashCode()`
`boolean`	`isLiteral()`
`ComparativeAtom`	`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.ASPElement
containsTermsOfType, exchange, isGround, isWellFormed, substitute

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ComparativeAtom
```
public ComparativeAtom(ASPOperator.BinaryOperator op,
                       Term<?> left,
                       Term<?> right)
```
  - ComparativeAtom
```
public ComparativeAtom(ComparativeAtom other)
```
    Copy-Constructor
    
    Parameters:
    
    other - another ComparativeAtom
- Method Detail
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - getLiterals
```
public java.util.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
  - getPredicates
```
public java.util.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
  - getAtoms
```
public java.util.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
  - substitute
```
public ComparativeAtom 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".
  - 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.
  - clone
```
public ASPBodyElement 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
  - getPredicateCls
```
public java.lang.Class<? extends Predicate> getPredicateCls()
```
    Specified by:
    
    getPredicateCls in interface SimpleLogicalFormula
    
    Overrides:
    
    getPredicateCls in class ASPElement
    
    Returns:
    
    The class description of the predicate used by this formula.
  - isLiteral
```
public boolean isLiteral()
```
    Returns:
    
    true if the formula represents a literal in the language or false otherwise
  - getTerms
```
public java.util.Set<Term<?>> getTerms()
```
    Returns:
    
    a set containing all terms of this logical structure
  - getOperator
```
public ASPOperator.BinaryOperator getOperator()
```
    Returns the comparative operator of the atom.
    
    Returns:
    
    the comparative operator of the atom.
  - getLeft
```
public Term<?> getLeft()
```
    Returns the left (first) term of the comparative atom.
    
    Returns:
    
    the left (first) term of the comparative atom.
  - getRight
```
public Term<?> getRight()
```
    Returns the right (second) term of the comparative atom.
    
    Returns:
    
    the right (second) term of the comparative atom.
  - getTerms
```
public <C extends Term<?>> java.util.Set<C> getTerms(java.lang.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
  - 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

Class ComparativeAtom

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

ComparativeAtom

ComparativeAtom

Method Detail

toString

getLiterals

getPredicates

getAtoms

substitute

getSignature

clone

getPredicateCls

isLiteral

getTerms

getOperator

getLeft

getRight

getTerms

hashCode

equals