class AbstractEntry implements ICacheEntry<D> {

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    AbstractEntry<?> other = (AbstractEntry<?>) obj;
    if (data == null) {
      if (other.data != null) {
        return false;
      }
    } else if (!data.equals(other.data)) {
      return false;
    }
    return true;
  }

  public  AbstractEntry(D data);

}