Class 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
    • Field Detail

      • left

        private Term<?> left
        The left term of the comparative atom.
      • right

        private Term<?> right
        The right term of the comparative atom.
    • 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
      • 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.
      • 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