class WrapperType {

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        WrapperType other = (WrapperType)obj;
        if (!name.equals(other.name)) {
            return false;
        }
        if (parent == null) {
            if (other.parent != null) {
                return false;
            }
        } else if (!parent.equals(other.parent)) {
            return false;
        }
        return true;
    }

    private  WrapperType(String name, WrapperType parent);

}