public synchronized int hashCode() {
        if (__hashCodeCalc) {
            return 0;
        }
        __hashCodeCalc = true;
        int _hashCode = 1;
        if (getId() != null) {
            _hashCode += getId().hashCode();
        }
        if (getFilename() != null) {
            _hashCode += getFilename().hashCode();
        }
        if (getSize() != null) {
            _hashCode += getSize().hashCode();
        }
        if (getContent_type() != null) {
            _hashCode += getContent_type().hashCode();
        }
        if (getDate_submitted() != null) {
            _hashCode += getDate_submitted().hashCode();
        }
        if (getDownload_url() != null) {
            _hashCode += getDownload_url().hashCode();
        }
        if (getUser_id() != null) {
            _hashCode += getUser_id().hashCode();
        }
        __hashCodeCalc = false;
        return _hashCode;
    }
public synchronized int hashCode()