case PreauthIntegrityNegotiateContext.NEGO_CTX_PREAUTH_TYPE:
            return new PreauthIntegrityNegotiateContext();
        case CompressionNegotiateContext.NEGO_CTX_COMPRESSION_TYPE:
            return new CompressionNegotiateContext();
        }
        return null;
    }

    /**
     * {@inheritDoc}
     *