@Override
    public boolean equals(Object obj) {

        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        DefaultFeatureHolder other = (DefaultFeatureHolder) obj;
        if (features == null) {
            if (other.features != null) {
                return false;
            }
        } else if (!features.equals(other.features)) {
            return false;
        }
        return true;
    }