Cut.java

// A variation that involves subtyping

package org.softlang.company.features;

import org.softlang.company.xjc.*;

public class Cut {
    
    public static void cut(Company c) {
        for (Department d : c.getDepartment())
            cut(d);
    }

    public static void cut(Department d) {
        cut(d.getManager());
        for (Subunit s : d.getSubunit())
            cut(s);
    }

    public static void cut(Employee e) {
        e.setSalary(e.getSalary() / 2);
    }

    public static void cut(Subunit s) {
        if (s instanceof Department)
            cut(((Department)s));
        else if (s instanceof Employee)
            cut(((Employee)s));
        else throw new IllegalArgumentException();
    }

}