UnmodifiedParameter.java

import java.awt.*;

class UnmodifiedParameter {

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

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

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

    return <caret>hasAncestor(child.getParent(), ancestor);
  }
}