private static void UnmarshallResult(XmlUnmarshallerContext context, DescribeDBEngineVersionsResponse response)
        {
            int originalDepth = context.CurrentDepth;
            int targetDepth   = originalDepth + 1;

            if (context.IsStartOfDocument)
            {
                targetDepth += 2;
            }

            while (context.ReadAtDepth(originalDepth))
            {
                if (context.IsStartElement || context.IsAttribute)
                {
                    if (context.TestExpression("DBEngineVersions/DBEngineVersion", targetDepth))
                    {
                        var unmarshaller = DBEngineVersionUnmarshaller.Instance;
                        var item         = unmarshaller.Unmarshall(context);
                        response.DBEngineVersions.Add(item);
                        continue;
                    }
                    if (context.TestExpression("Marker", targetDepth))
                    {
                        var unmarshaller = StringUnmarshaller.Instance;
                        response.Marker = unmarshaller.Unmarshall(context);
                        continue;
                    }
                }
            }

            return;
        }
        /// <summary>
        /// Unmarshaller the response from the service to the response class.
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public override AmazonWebServiceResponse Unmarshall(XmlUnmarshallerContext context)
        {
            DescribeDBEngineVersionsResponse response = new DescribeDBEngineVersionsResponse();

            context.Read();
            int targetDepth = context.CurrentDepth;

            while (context.ReadAtDepth(targetDepth))
            {
                if (context.IsStartElement)
                {
                    if (context.TestExpression("DescribeDBEngineVersionsResult", 2))
                    {
                        UnmarshallResult(context, response);
                        continue;
                    }

                    if (context.TestExpression("ResponseMetadata", 2))
                    {
                        response.ResponseMetadata = ResponseMetadataUnmarshaller.Instance.Unmarshall(context);
                    }
                }
            }

            return(response);
        }
        public override void Invoke(AWSCredentials creds, RegionEndpoint region, int maxItems)
        {
            AmazonNeptuneConfig config = new AmazonNeptuneConfig();

            config.RegionEndpoint = region;
            ConfigureClient(config);
            AmazonNeptuneClient client = new AmazonNeptuneClient(creds, config);

            DescribeDBEngineVersionsResponse resp = new DescribeDBEngineVersionsResponse();

            do
            {
                DescribeDBEngineVersionsRequest req = new DescribeDBEngineVersionsRequest
                {
                    Marker = resp.Marker
                    ,
                    MaxRecords = maxItems
                };

                resp = client.DescribeDBEngineVersions(req);
                CheckError(resp.HttpStatusCode, "200");

                foreach (var obj in resp.DBEngineVersions)
                {
                    AddObject(obj);
                }
            }while (!string.IsNullOrEmpty(resp.Marker));
        }
        /// <summary>
        /// <para> Returns a list of the available DB engines. </para>
        /// </summary>
        ///
        /// <param name="describeDBEngineVersionsRequest">Container for the necessary parameters to execute the DescribeDBEngineVersions service method
        ///           on AmazonRDS.</param>
        ///
        /// <returns>The response from the DescribeDBEngineVersions service method, as returned by AmazonRDS.</returns>
        ///
        public DescribeDBEngineVersionsResponse DescribeDBEngineVersions(DescribeDBEngineVersionsRequest describeDBEngineVersionsRequest)
        {
            IRequest <DescribeDBEngineVersionsRequest> request  = new DescribeDBEngineVersionsRequestMarshaller().Marshall(describeDBEngineVersionsRequest);
            DescribeDBEngineVersionsResponse           response = Invoke <DescribeDBEngineVersionsRequest, DescribeDBEngineVersionsResponse> (request, this.signer, DescribeDBEngineVersionsResponseUnmarshaller.GetInstance());

            return(response);
        }
        public override AmazonWebServiceResponse Unmarshall(XmlUnmarshallerContext context)
        {
            DescribeDBEngineVersionsResponse response = new DescribeDBEngineVersionsResponse();

            while (context.Read())
            {
                if (context.IsStartElement)
                {
                    if (context.TestExpression("DescribeDBEngineVersionsResult", 2))
                    {
                        response.DescribeDBEngineVersionsResult = DescribeDBEngineVersionsResultUnmarshaller.GetInstance().Unmarshall(context);
                        continue;
                    }
                    if (context.TestExpression("ResponseMetadata", 2))
                    {
                        response.ResponseMetadata = ResponseMetadataUnmarshaller.GetInstance().Unmarshall(context);
                    }
                }
            }


            return(response);
        }
        private static void UnmarshallResult(XmlUnmarshallerContext context, DescribeDBEngineVersionsResponse response)
        {
            int originalDepth = context.CurrentDepth;
            int targetDepth   = originalDepth + 1;

            if (context.IsStartOfDocument)
            {
                targetDepth += 2;
            }

            while (context.Read())
            {
                if (context.IsStartElement || context.IsAttribute)
                {
                    if (context.TestExpression("Marker", targetDepth))
                    {
                        response.Marker = StringUnmarshaller.GetInstance().Unmarshall(context);

                        continue;
                    }
                    if (context.TestExpression("DBEngineVersions/DBEngineVersion", targetDepth))
                    {
                        response.DBEngineVersions.Add(DBEngineVersionUnmarshaller.GetInstance().Unmarshall(context));

                        continue;
                    }
                }
                else if (context.IsEndElement && context.CurrentDepth < originalDepth)
                {
                    return;
                }
            }



            return;
        }