SemWeb.Query.SparqlEngine.Run C# (CSharp) Method

        public override void Run(SelectableSource source, QueryResultSink resultsink)
        {
            if (!(query is SelectQuery))
                throw new InvalidOperationException("Only SELECT queries are supported by this method (" + query.GetType() + ").");

            // Perform the query
            SelectQuery squery = (SelectQuery)query;
            RdfSourceWrapper sourcewrapper = BindLogic(source);

            RdfBindingSet results;
            try {
                results = squery.execute(sourcewrapper);
            } catch (name.levering.ryan.sparql.common.QueryException e) {
                throw new QueryExecutionException("Error executing query: " + e.Message, e);
            }

            // Prepare binding objects
            java.util.List vars = results.getVariables();
            SparqlVariable[] svars = new SparqlVariable[vars.size()];
            SemWebVariable[] vars2 = new SemWebVariable[vars.size()];
            for (int i = 0; i < svars.Length; i++) {
                svars[i] = (SparqlVariable)vars.get(i);
                vars2[i] = new SemWebVariable(svars[i].getName());
            }

            // Initialize the result sink
            resultsink.Init(vars2); // set distinct and ordered

            // Set the comments
            resultsink.AddComments(queryString + "\n");
            resultsink.AddComments(sourcewrapper.GetLog());

            // Iterate the bindings
            java.util.Iterator iter = results.iterator();
            long ctr = -1, ctr2 = 0;
            while (iter.hasNext()) {
                RdfBindingRow row = (RdfBindingRow)iter.next();

                // Since SPARQL processing may be lazy-delayed,
                // add any new comments that might have been logged.
                resultsink.AddComments(sourcewrapper.GetLog());

                ctr++;

                if (ctr < ReturnStart && ReturnStart != -1) continue;

                Resource[] bindings = new Resource[vars2.Length];

                for (int i = 0; i < bindings.Length; i++) {
                    Resource r = sourcewrapper.ToResource(row.getValue(svars[i]));
                    r = sourcewrapper.Persist(r);
                    bindings[i] = r;
                }

                resultsink.AddComments(sourcewrapper.GetLog());

                resultsink.Add(new VariableBindings(vars2, bindings));

                ctr2++;
                if (ctr2 >= ReturnLimit && ReturnLimit != -1) break;
            }

            resultsink.AddComments(sourcewrapper.GetLog());

            // Close the result sink.
            resultsink.Finished();
        }

        public object Search(queryrequest xml)
        {
            SemWeb.Query.Query query = null;

            string q = string.Empty;

            try
            {
                query = new SparqlEngine(new StringReader(xml.query));
            }
            catch (QueryFormatException ex)
            {
                var malformed = new malformedquery();

                malformed.faultdetails = ex.Message;

                return malformed;
            }

            // Load the data from sql server
            SemWeb.Stores.SQLStore store;

            string connstr = ConfigurationManager.ConnectionStrings["SemWebDB"].ConnectionString;

            DebugLogging.Log(connstr);

            store = (SemWeb.Stores.SQLStore)SemWeb.Store.CreateForInput(connstr);

            //Create a Sink for the results to be writen once the query is run.
            MemoryStream ms = new MemoryStream();
            XmlTextWriter writer = new XmlTextWriter(ms, System.Text.Encoding.UTF8);
            QueryResultSink sink = new SparqlXmlQuerySink(writer);

            try
            {
                // Run the query.
                query.Run(store, sink);

            }
            catch (Exception ex)
            {
                // Run the query.
                query.Run(store, sink);
                DebugLogging.Log("Run the query a second time");
                DebugLogging.Log(ex.Message);

            }
            //flush the writer then  load the memory stream
            writer.Flush();
            ms.Seek(0, SeekOrigin.Begin);

            //Write the memory stream out to the response.
            ASCIIEncoding ascii = new ASCIIEncoding();
            DebugLogging.Log(ascii.GetString(ms.ToArray()).Replace("???", ""));
            writer.Close();

            DebugLogging.Log("End of Processing");

            return SerializeXML.DeserializeObject(ascii.GetString(ms.ToArray()).Replace("???", ""), typeof(sparql)) as sparql;
        }