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