private SparqlResultSet ParseSparqlResultSetXmlResultFile(XDocument expected)
{
XNamespace ns = "http://www.w3.org/2005/sparql-results#";
var variableNodes = expected
.Descendants()
.Where(x => x.Name.Namespace == ns && x.Name.LocalName == "head")
.Descendants()
.Where(x => x.Name.Namespace == ns && x.Name.LocalName == "variable")
.Select(x => x.Attribute("name"))
.Where(x => x != null)
.Select(x => x.Value);
var resultSet = new SparqlResultSet();
var handler = new ResultSetHandler(resultSet);
handler.StartResults();
foreach (var variable in variableNodes)
{
handler.HandleVariable(variable);
}
var resultNodes = expected
.Descendants()
.Where(x => x.Name.Namespace == ns && x.Name.LocalName == "results")
.Descendants()
.Where(x => x.Name.Namespace == ns && x.Name.LocalName == "result");
foreach (var resultNode in resultNodes)
{
var bindings = resultNode
.Descendants()
.Where(x => x.Name.Namespace == ns && x.Name.LocalName == "binding")
.Where(x => x.Attribute("name") != null);
var set = new Set();
foreach (var binding in bindings)
{
var varNane = binding.Attribute("name").Value;
var value = GetSparqlValue(binding, handler);
if (value != null)
{
set.Add(varNane, value);
}
}
handler.HandleResult(new SparqlResult(set));
}
handler.EndResults(true);
return(resultSet);
}
/// <summary>
/// Runs the task
/// </summary>
/// <returns></returns>
protected override object RunTaskInternal()
{
try
{
//Firstly try and parse the Query
this.Query = this._parser.ParseFromString(this.QueryString);
}
catch
{
this.Information = "Query is not valid SPARQL 1.0/1.1 - will attempt to evaluate it but underlying store may reject the originalQuery...";
}
// Successfuly parsed originalQuery
if (this.Query != null)
{
//Then apply it to the Manager using the GenericQueryProcessor
try
{
//Check that paging can be used if it was enabled
if (this._usePaging)
{
if (this.Query.Limit >= 0 || this.Query.Offset > 0)
{
throw new RdfQueryException("Cannot apply originalQuery paging when the SPARQL Query already contains an explicit LIMIT and/or OFFSET clause");
}
else if (this.Query.QueryType == SparqlQueryType.Ask)
{
throw new RdfQueryException("Cannot apply originalQuery paging to an ASK Query");
}
}
int offset = 0;
TimeSpan totalTime = TimeSpan.Zero;
switch (this.Query.QueryType)
{
case SparqlQueryType.Ask:
SparqlResultSet blnResult = this._processor.ProcessQuery(this.Query) as SparqlResultSet;
if (blnResult == null)
{
throw new RdfQueryException("Store did not return a SPARQL Result Set for the ASK originalQuery as was expected");
}
return(blnResult);
case SparqlQueryType.Construct:
case SparqlQueryType.Describe:
case SparqlQueryType.DescribeAll:
Graph g = new Graph();
g.NamespaceMap.Import(this.Query.NamespaceMap);
do
{
if (this._usePaging)
{
this.Query.Limit = this._pageSize;
this.Query.Offset = offset;
}
Object result = this._processor.ProcessQuery(this.Query);
totalTime += this.Query.QueryExecutionTime.HasValue ? this.Query.QueryExecutionTime.Value : TimeSpan.Zero;
if (!(result is IGraph))
{
throw new RdfQueryException("SPARQL Query did not return a RDF Graph as expected");
}
IGraph temp = (IGraph)result;
//If no further results can halt
if (temp.Triples.Count == 0)
{
break;
}
offset += this._pageSize;
//Merge the partial result into the final result
g.Merge(temp);
} while (this._usePaging);
this.Information = "Query Completed OK (Took " + totalTime.ToString() + ")";
return(g);
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
SparqlResultSet results = new SparqlResultSet();
ResultSetHandler handler = new ResultSetHandler(results);
try
{
handler.StartResults();
do
{
if (this._usePaging)
{
this.Query.Limit = this._pageSize;
this.Query.Offset = offset;
}
Object result = this._processor.ProcessQuery(this.Query);
totalTime += this.Query.QueryExecutionTime.HasValue ? this.Query.QueryExecutionTime.Value : TimeSpan.Zero;
if (!(result is SparqlResultSet))
{
throw new RdfQueryException("SPARQL Query did not return a SPARQL Result Set as expected");
}
SparqlResultSet rset = (SparqlResultSet)result;
foreach (String var in rset.Variables)
{
handler.HandleVariable(var);
}
//If no further results can halt
if (rset.Count == 0)
{
break;
}
offset += this._pageSize;
//Merge the partial result into the final result
foreach (SparqlResult r in rset)
{
handler.HandleResult(r);
}
} while (this._usePaging);
handler.EndResults(true);
}
catch
{
handler.EndResults(false);
throw;
}
this.Information = "Query Completed OK (Took " + totalTime.ToString() + ")";
return(results);
default:
throw new RdfQueryException("Cannot evaluate an unknown originalQuery type");
}
}
catch
{
//Try and show the execution time if possible
if (this.Query.QueryExecutionTime.HasValue)
{
this.Information = "Query Failed (Took " + this.Query.QueryExecutionTime.Value + ")";
}
else
{
this.Information = "Query Failed";
}
throw;
}
}
// Unsuccessfully parsed originalQuery - may be using syntax extensions specific to the target store
DateTime start = DateTime.Now;
try
{
if (this._usePaging)
{
throw new RdfQueryException("Cannot apply paging to a Query that we cannot parse as a valid SPARQL 1.0/1.1 originalQuery");
}
Object results = this._storage.Query(this.QueryString);
this.Information = "Query Completed OK (Took " + (DateTime.Now - start) + ")";
return(results);
}
catch
{
//Try and show the execution time if possible
try
{
this.Information = "Query Failed (Took " + (DateTime.Now - start) + ")";
}
catch
{
this.Information = "Query Failed";
}
throw;
}
}
