Total.java

package org.softlang.company.features;

import org.softlang.company.model.*;

public class Total {

    public static Double total(Company that) {
        double total = 0;
        for (Department d : that.getDepts())
            total += total(d);
        return total;
    }    

    public static double total(Department that) {
        double total = 0;
        total += total(that.getManager());
        for (Department s : that.getSubdepts())
            total += total(s);
        for (Employee e : that.getEmployees())
            total += total(e);
        return total;
    }    

    public static double total(Employee that) {
        return that.getSalary();
    }

}