Package org.tweetyproject.lp.asp.syntax

Class AggregateHead

java.lang.Object
org.tweetyproject.lp.asp.syntax.ASPElement
org.tweetyproject.lp.asp.syntax.ASPHead
org.tweetyproject.lp.asp.syntax.AggregateHead
All Implemented Interfaces:
Formula, ComplexLogicalFormula, LogicStructure, SimpleLogicalFormula
public class AggregateHead extends ASPHead
This class is a variant of the basic ASP rule head. It allows the usage of aggregate atoms as heads. Note: this is not allowed in the ASP-Core-2 standard.
Author:
Anna Gessler

  • Constructor Details

    • AggregateHead

      public AggregateHead(AggregateAtom head)
      Creates a new ASPAggregateHead with the given aggregate atom.
      Parameters:
      head - an AggregateAtom

    • AggregateHead

      public AggregateHead()
      Creates a new empty ASPAggregateHead.

    • AggregateHead

      public AggregateHead(List<ASPBodyElement> literals, int leftBound, int rightBound)
      Creates a new cardinality rule head.
      Parameters:
      literals - of the cardinality rule head
      leftBound - of the cardinality rule
      rightBound - of the cardinality rule

  • Method Details

    • getFormula

      public AggregateAtom getFormula()
      Returns:
      the aggregate atom that makes up this rule head.

    • setFormula

      public void setFormula(AggregateAtom head)
      Sets the aggregate atom that makes up this rule head.
      Parameters:
      head - the head to set

    • 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

    • 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

    • substitute

      public 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
      Specified by:
      substitute in class ASPElement
      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.

    • 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 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
      Specified by:
      clone in class ASPElement
      Returns:
      the cloned formula

    • isEmpty

      public boolean isEmpty()
      Specified by:
      isEmpty in class ASPHead
      Returns:
      true if the head is empty, false otherwise

    • getLiterals

      public Collection<? extends ASPLiteral> getLiterals()
      Description copied from class: ASPHead
      Returns all literals in this element in form of a SortedSet. Literals are atoms or strict negations of atoms.
      Specified by:
      getLiterals in class ASPHead
      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

    • printToDLV

      public String printToDLV()
      Description copied from class: ASPElement
      Returns a representation of this ASP element in DLV syntax. See http://www.dlvsystem.com/html/DLV_User_Manual.html for more information.
      Overrides:
      printToDLV in class ASPElement
      Returns:
      String representation in DLV 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