jason.functions.Min Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jason Show documentation

Jason is a fully-fledged interpreter for an extended version of AgentSpeak, a BDI agent-oriented logic programming language.

There is a newer version: 2.3

Show newest version

package jason.functions;

import jason.JasonException;
import jason.asSemantics.DefaultArithFunction;
import jason.asSemantics.TransitionSystem;
import jason.asSyntax.ListTerm;
import jason.asSyntax.NumberTerm;
import jason.asSyntax.Term;

/** 
Function: math.min(N1,N2): encapsulates java Math.min(N1,N2).
   It also returns the min number of a list.

Examples:

 math.min(1,3): returns 1.
 math.min([3,a,"s",5]): returns 3.

 
@author Jomi 

@see jason.functions.Max
*/
public class Min extends DefaultArithFunction  {

    public String getName() {
        return "math.min";
    }
    
    @Override
    public double evaluate(TransitionSystem ts, Term[] args) throws Exception {
        if (args[0].isNumeric() && args[1].isNumeric()) {
            double n0 = ((NumberTerm)args[0]).solve();
            double n1 = ((NumberTerm)args[1]).solve();
            return Math.min(n0,n1);
        } else if (args[0].isList()) {
            double min = Double.MAX_VALUE;
            for (Term t: (ListTerm)args[0]) {
                if (t.isNumeric()) {
                    double n = ((NumberTerm)t).solve();
                    if (n < min)
                        min = n;
                }
            }
            return min;
        }
        throw new JasonException(getName()+" is not implemented for type '"+args[0]+"'.");
    }

    @Override
    public boolean checkArity(int a) {
        return a == 1 || a == 2;
    }
}