/// <summary>
/// Query the store using a SPARQL query
/// </summary>
/// <param name="storeName">Store to query</param>
/// <param name="queryExpression">SPARQL query string</param>
/// <param name="ifNotModifiedSince">OPTIONAL: If the store has not been modified since the time specified by this parameter,
/// the query is not executed and a <see cref="BrightstarStoreNotModifiedException"/> is raised instead.</param>
/// <param name="resultsFormat">OPTIONAL: The format to use for the SPARQL results. Defaults to <see cref="SparqlResultsFormat.Xml"/>.</param>
/// <returns>A stream containing SPARQL query results in the requested format</returns>
public Stream ExecuteQuery(string storeName, string queryExpression, DateTime?ifNotModifiedSince = null, SparqlResultsFormat resultsFormat = null)
{
if (storeName == null)
{
throw new ArgumentNullException("storeName");
}
if (queryExpression == null)
{
throw new ArgumentNullException("queryExpression");
}
if (resultsFormat == null)
{
resultsFormat = SparqlResultsFormat.Xml;
}
try
{
var pStream = new MemoryStream();
#if SILVERLIGHT
var t = new Thread(ExecuteQuery);
t.Start(new QueryParams(storeName, queryExpression, ifNotModifiedSince, resultsFormat, pStream));
t.Join();
#else
var t = new Task(() => _serverCore.Query(storeName, queryExpression, ifNotModifiedSince, resultsFormat, pStream));
t.Start();
t.Wait();
if (t.IsFaulted && t.Exception != null)
{
throw t.Exception;
}
#endif
pStream.Seek(0, SeekOrigin.Begin);
return(pStream);
}
catch (BrightstarStoreNotModifiedException ex)
{
throw new BrightstarClientException("Store not modified", new ExceptionDetail(ex));
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ServerCoreException, "Error Executing Query {0} {1}", storeName, queryExpression);
throw new BrightstarClientException("Error querying store " + storeName + " with expression " + queryExpression + ". " + ex.Message, ex);
}
}
public override SparqlResult ExecuteSparql(string sparqlExpression)
{
var resultStream = new MemoryStream();
_serverCore.Query(_storeName, sparqlExpression, DataSetGraphUris, null, SparqlResultsFormat.Xml,
RdfFormat.RdfXml, resultStream);
resultStream.Seek(0, SeekOrigin.Begin);
return(new SparqlResult(resultStream));
}
public override SparqlResult ExecuteSparql(SparqlQueryContext sparqlQueryContext)
{
var resultStream = new MemoryStream();
_serverCore.Query(_storeName, sparqlQueryContext.SparqlQuery, DataSetGraphUris, null, SparqlResultsFormat.Xml,
RdfFormat.RdfXml, resultStream);
resultStream.Seek(0, SeekOrigin.Begin);
return(new SparqlResult(resultStream, sparqlQueryContext));
}
public override SparqlResult ExecuteSparql(string sparqlExpression)
{
var xml = _serverCore.Query(_storeName, sparqlExpression, SparqlResultsFormat.Xml);
return(new SparqlResult(xml));
}
public string ProcessQuery(string storeId, string query)
{
return(_serverCore.Query(storeId, query, SparqlResultsFormat.Xml));
}