Package net.sf.tweety.math.equation

Class Statement

  • Direct Known Subclasses:
    Equation, Inequation
    public abstract class Statement
extends Object
    This class models a mathematical statement, i.e. an equality or an inequality.
    Author:
    Matthias Thimm

    • Constructor Detail

      • Statement

        public Statement​(Term leftTerm,
                 Term rightTerm)
        Creates a new statement with the given terms.
        Parameters:
        leftTerm - a term.
        rightTerm - a term.

    • Method Detail

      • getLeftTerm

        public Term getLeftTerm()
        Returns the left term of this statement.
        Returns:
        the left term of this statement.

      • getMinimums

        public Set<Minimum> getMinimums()
        Returns all minimums of this statement.
        Returns:
        all minimums of this statement.

      • getMaximums

        public Set<Maximum> getMaximums()
        Returns all maximums of this statement.
        Returns:
        all maximums of this statement.

      • getAbsoluteValues

        public Set<AbsoluteValue> getAbsoluteValues()
        Returns all absolute values of this statement.
        Returns:
        all absolute values of this statement.

      • replaceTerm

        public abstract Statement replaceTerm​(Term toSubstitute,
                                      Term substitution)
        Replaces each occurrence of "toSubstitute" by "substitution" and return the new statement.
        Parameters:
        toSubstitute - the term to be substituted
        substitution - the new term
        Returns:
        this statement where "toSubstitute" is replaced by "substitution"

      • replaceAllTerms

        public Statement replaceAllTerms​(Map<? extends Term,​? extends Term> substitutes)
        Replaces terms according to the given map.
        Parameters:
        substitutes - a map.
        Returns:
        a term.

      • isNormalized

        public abstract boolean isNormalized()
        Checks whether this constraint is of normalized form, i.e. whether it has the form "T > 0" or "T >= 0", "T = 0" or "T != 0"
        Returns:
        "true" iff this constraint is normalized.

      • toNormalizedForm

        public abstract Statement toNormalizedForm()
        Normalizes this constraint, i.e. brings it into an equivalent form "T > 0" or "T >= 0", "T = 0" or "T != 0".
        Returns:
        a statement.

      • toLinearForm

        public abstract Statement toLinearForm()
        Brings both terms into linear form. If this constraint is normalized (i.e. the right term consists of the constant 0) the right term is not linearized.
        Returns:
        a statement.

      • collapseAssociativeOperations

        public void collapseAssociativeOperations()
        This method collapses all associative operations appearing in this statement, e.g. every min{min{a,b},c} becomes min{a,b,c}

      • expandAssociativeOperations

        public void expandAssociativeOperations()
        This method expands all associative operations appearing in this statement, e.g. every min{a,b,c} becomes min{min{a,b},c}.

      • getRightTerm

        public Term getRightTerm()
        Returns the right term of this statement.
        Returns:
        the right term of this statement.

      • setLeftTerm

        public void setLeftTerm​(Term t)
        Sets the left term of this statement.
        Parameters:
        t - a term

      • setRightTerm

        public void setRightTerm​(Term t)
        Sets the right term of this statement.
        Parameters:
        t - a term

      • getRelationSymbol

        public abstract String getRelationSymbol()
        Returns the relation symbol of this statement.
        Returns:
        the relation symbol of this statement.