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Jason is a programming language to develop BDI/cognitive agents

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package jason.functions;

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

/**
  Function: math.abs(N): encapsulates java Math.abs(N).

  
Examples:

   math.abs(1): returns 1.
   math.abs(-1): returns 1.
  

  @author Jomi
*/
public class Abs extends DefaultArithFunction  {

    public String getName() {
        return "math.abs";
    }

    @Override
    public double evaluate(TransitionSystem ts, Term[] args) throws Exception {
        if (args[0].isNumeric()) {
            double n = ((NumberTerm)args[0]).solve();
            return Math.abs(n);
        } else {
            throw new JasonException("The argument '"+args[0]+"' is not numeric!");
        }
    }

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

}