UnmodifiedParameter.after.java

import java.awt.*;

class UnmodifiedParameter {

    private static boolean hasAncestor(Container child, Container ancestor) {
        while (true) {
            if (child == null) {
                return false;
            }

            if (ancestor == null) {
                return true;
            }

            if (child.getParent() == ancestor) {
                return true;
            }

            child = child.getParent();
        }
    }
}