public fclsInspect(SparqlQuery query, long parseTime, String origQuery)
{
InitializeComponent();
this.lblParseTime.Text = "Took " + parseTime + "ms to parse";
this.txtQuery.Text = this._formatter.Format(query);
this.txtAlgebra.Text = query.ToAlgebra().ToString();
//Compute the actual syntax compatability
SparqlQueryParser parser = new SparqlQueryParser();
parser.SyntaxMode = SparqlQuerySyntax.Sparql_1_0;
try
{
SparqlQuery q = parser.ParseFromString(origQuery);
this.lblSyntaxCompatability.Text += " SPARQL 1.0 (Standard)";
}
catch
{
try
{
parser.SyntaxMode = SparqlQuerySyntax.Sparql_1_1;
SparqlQuery q = parser.ParseFromString(origQuery);
this.lblSyntaxCompatability.Text += " SPARQL 1.1 (Current Working Draft Standard)";
}
catch
{
parser.SyntaxMode = SparqlQuerySyntax.Extended;
SparqlQuery q = parser.ParseFromString(origQuery);
this.lblSyntaxCompatability.Text += " SPARQL 1.1 (Implementation specific extensions)";
}
}
}
/// <summary>
/// Executes a SPARQL Query on the Graph
/// </summary>
/// <param name="query">SPARQL Query</param>
/// <returns></returns>
public Object ExecuteQuery(SparqlQuery query)
{
if (this._store == null)
{
this._store = new TripleStore();
this._store.Add(this);
}
return this._store.ExecuteQuery(query);
}
/// <summary>
/// Creates a new Evaluation Context for the given Query over the given Dataset
/// </summary>
/// <param name="q">Query</param>
/// <param name="data">Dataset</param>
public SparqlEvaluationContext(SparqlQuery q, ISparqlDataset data)
{
this._query = q;
this._data = data;
this._inputSet = new IdentityMultiset();
this._binder = new LeviathanResultBinder(this);
this.CalculateTimeout();
}
/// <summary>
/// Creates a new SPARQL View
/// </summary>
/// <param name="sparqlQuery">SPARQL Query</param>
/// <param name="store">Triple Store to query</param>
public BaseSparqlView(String sparqlQuery, ITripleStore store)
{
SparqlQueryParser parser = new SparqlQueryParser();
this._q = parser.ParseFromString(sparqlQuery);
this._store = store;
this._async = new UpdateViewDelegate(this.UpdateViewInternal);
this.Initialise();
}
/// <summary>
/// Processes the SPARQL Query using the underlying processor and then
/// </summary>
/// <param name="query"></param>
/// <param name="sink"></param>
public void Run(SparqlQuery query, ILinqResultsSink sink)
{
Object results = this.ProcessQuery(query);
if (results is SparqlResultSet)
{
sink.Fill((SparqlResultSet)results);
}
else if (results is BaseMultiset)
{
sink.Fill((BaseMultiset)results);
}
else
{
throw new LinqToRdfException("Underlying Query Processor returned unexpected results of type " + results.GetType().ToString());
}
}
/// <summary>
/// Processes a SPARQL Query
/// </summary>
/// <param name="query">SPARQL Query</param>
/// <returns></returns>
public object ProcessQuery(SparqlQuery query)
{
query.QueryExecutionTime = null;
query.QueryTime = -1;
query.QueryTimeTicks = -1;
DateTime start = DateTime.Now;
try
{
Object temp = this._store.ExecuteQuery(this._formatter.Format(query));
return temp;
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = elapsed;
query.QueryTime = elapsed.Milliseconds;
query.QueryTimeTicks = elapsed.Ticks;
}
}
public fclsExplanation(SparqlQuery query, long parseTime)
{
InitializeComponent();
this.lblParseTime.Text = "Took " + parseTime + "ms to parse";
this.txtQuery.Text = this._formatter.Format(query);
//First need to create the Explanation
using (StreamWriter writer = new StreamWriter("explain.temp", false, Encoding.UTF8))
{
ExplainQueryProcessor processor = new ExplainQueryProcessor(new TripleStore());
processor.ExplanationLevel = (ExplanationLevel.OutputToTrace | ExplanationLevel.ShowAll | ExplanationLevel.AnalyseAll | ExplanationLevel.Simulate) ^ ExplanationLevel.ShowThreadID ^ ExplanationLevel.ShowTimings ^ ExplanationLevel.ShowIntermediateResultCount;
TextWriterTraceListener listener = new TextWriterTraceListener(writer, "SparqlGUI");
Trace.Listeners.Add(listener);
try
{
Object results = processor.ProcessQuery(query);
}
catch
{
throw;
}
finally
{
Trace.Listeners.Remove(listener);
}
writer.Close();
}
//Then need to display it
using (StreamReader reader = new StreamReader("explain.temp"))
{
this.txtExplanation.Text = reader.ReadToEnd();
reader.Close();
}
}
private void TestProductTimeout(IGraph data, String query, bool useGlobal, int expectedResults)
{
Console.WriteLine("Maximum Expected Results: " + expectedResults);
Console.WriteLine("Initial Global Timeout: " + Options.QueryExecutionTimeout);
Console.WriteLine();
long globalOrig = Options.QueryExecutionTimeout;
try
{
if (useGlobal)
{
Console.WriteLine("Global Timeout setting in use");
}
else
{
Console.WriteLine("Per Query Timeout setting in use");
}
Console.WriteLine();
TripleStore store = new TripleStore();
store.Add(data);
SparqlQuery q = this._parser.ParseFromString(query);
LeviathanQueryProcessor processor = new LeviathanQueryProcessor(AsDataset(store));
SparqlFormatter formatter = new SparqlFormatter();
Console.WriteLine("Query:");
Console.WriteLine(formatter.Format(q));
//Evaluate for each Timeout
foreach (long t in this._timeouts)
{
//Set the Timeout and ask for Partial Results
if (useGlobal)
{
Options.QueryExecutionTimeout = t;
}
else
{
q.Timeout = t;
}
q.PartialResultsOnTimeout = true;
//Check that the reported Timeout matches the expected
SparqlEvaluationContext context = new SparqlEvaluationContext(q, null);
long expected;
if (useGlobal)
{
expected = t;
}
else
{
if (Options.QueryExecutionTimeout > 0 && t <= Options.QueryExecutionTimeout)
{
expected = t;
}
else if (Options.QueryExecutionTimeout == 0)
{
expected = t;
}
else
{
expected = Options.QueryExecutionTimeout;
}
}
Assert.AreEqual(expected, context.QueryTimeout, "Reported Timeout not as expected");
//Run the Query
Object results = processor.ProcessQuery(q);
if (results is SparqlResultSet)
{
SparqlResultSet rset = (SparqlResultSet)results;
Console.WriteLine("Requested Timeout: " + t + " - Actual Timeout: " + expected + "ms - Results: " + rset.Count + " - Query Time: " + q.QueryExecutionTime);
Assert.IsTrue(rset.Count <= expectedResults, "Results should be <= expected");
}
else
{
Assert.Fail("Did not get a Result Set as expected");
}
}
}
finally
{
Options.QueryExecutionTimeout = globalOrig;
}
}
private IGraph QueryWithGraph(SparqlQuery q, ISparqlQueryProcessor processor)
{
Object results = processor.ProcessQuery(q);
if (results is IGraph)
{
return (IGraph)results;
}
else
{
Assert.Fail("Query did not produce a Graph as expected");
}
return null;
}
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
#if !SILVERLIGHT
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
this._svc.Query(rdfHandler, resultsHandler, query.ToString());
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
}
#else
throw new NotSupportedException("Synchronous remote query is not supported under Silverlight/WP7 - please use one of the alternative overload of this methods which takes a callback");
#endif
}
/// <summary>
/// Processes a SPARQL Query sending the results to a RDF/SPARQL Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
//Do Handler null checks before evaluating the query
if (query == null)
{
throw new ArgumentNullException("query", "Cannot evaluate a null query");
}
if (rdfHandler == null && (query.QueryType == SparqlQueryType.Construct || query.QueryType == SparqlQueryType.Describe || query.QueryType == SparqlQueryType.DescribeAll))
{
throw new ArgumentNullException("rdfHandler", "Cannot use a null RDF Handler when the Query is a CONSTRUCT/DESCRIBE");
}
if (resultsHandler == null && (query.QueryType == SparqlQueryType.Ask || SparqlSpecsHelper.IsSelectQuery(query.QueryType)))
{
throw new ArgumentNullException("resultsHandler", "Cannot use a null resultsHandler when the Query is an ASK/SELECT");
}
//Handle the Thread Safety of the Query Evaluation
#if !NO_RWLOCK
ReaderWriterLockSlim currLock = (this._dataset is IThreadSafeDataset) ? ((IThreadSafeDataset)this._dataset).Lock : this._lock;
try
{
currLock.EnterReadLock();
#endif
//Reset Query Timers
query.QueryExecutionTime = null;
query.QueryTime = -1;
query.QueryTimeTicks = -1;
bool datasetOk = false, defGraphOk = false;
try
{
//Set up the Default and Active Graphs
IGraph defGraph;
if (query.DefaultGraphs.Any())
{
//Default Graph is the Merge of all the Graphs specified by FROM clauses
Graph g = new Graph();
foreach (Uri u in query.DefaultGraphs)
{
if (this._dataset.HasGraph(u))
{
g.Merge(this._dataset[u], true);
}
else
{
throw new RdfQueryException("A Graph with URI '" + u.ToString() + "' does not exist in this Triple Store, this URI cannot be used in a FROM clause in SPARQL queries to this Triple Store");
}
}
defGraph = g;
this._dataset.SetDefaultGraph(defGraph);
}
else if (query.NamedGraphs.Any())
{
//No FROM Clauses but one/more FROM NAMED means the Default Graph is the empty graph
defGraph = new Graph();
this._dataset.SetDefaultGraph(defGraph);
}
else
{
defGraph = this._dataset.DefaultGraph;
this._dataset.SetDefaultGraph(defGraph);
}
defGraphOk = true;
this._dataset.SetActiveGraph(defGraph);
datasetOk = true;
//Convert to Algebra and execute the Query
SparqlEvaluationContext context = this.GetContext(query);
BaseMultiset result;
try
{
context.StartExecution();
ISparqlAlgebra algebra = query.ToAlgebra();
result = context.Evaluate(algebra); //query.Evaluate(context);
context.EndExecution();
query.QueryExecutionTime = new TimeSpan(context.QueryTimeTicks);
query.QueryTime = context.QueryTime;
query.QueryTimeTicks = context.QueryTimeTicks;
}
catch (RdfQueryException)
{
context.EndExecution();
query.QueryExecutionTime = new TimeSpan(context.QueryTimeTicks);
query.QueryTime = context.QueryTime;
query.QueryTimeTicks = context.QueryTimeTicks;
throw;
}
catch
{
context.EndExecution();
query.QueryExecutionTime = new TimeSpan(context.QueryTimeTicks);
query.QueryTime = context.QueryTime;
query.QueryTimeTicks = context.QueryTimeTicks;
throw;
}
//Return the Results
switch (query.QueryType)
{
case SparqlQueryType.Ask:
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
//For SELECT and ASK can populate a Result Set directly from the Evaluation Context
//return new SparqlResultSet(context);
resultsHandler.Apply(context);
break;
case SparqlQueryType.Construct:
//Create a new Empty Graph for the Results
try
{
rdfHandler.StartRdf();
foreach (String prefix in query.NamespaceMap.Prefixes)
{
if (!rdfHandler.HandleNamespace(prefix, query.NamespaceMap.GetNamespaceUri(prefix)))
{
ParserHelper.Stop();
}
}
//Construct the Triples for each Solution
foreach (ISet s in context.OutputMultiset.Sets)
{
//List<Triple> constructedTriples = new List<Triple>();
try
{
ConstructContext constructContext = new ConstructContext(rdfHandler, s, false);
foreach (IConstructTriplePattern p in query.ConstructTemplate.TriplePatterns.OfType <IConstructTriplePattern>())
{
try
{
if (!rdfHandler.HandleTriple(p.Construct(constructContext)))
{
ParserHelper.Stop();
}
//constructedTriples.Add(((IConstructTriplePattern)p).Construct(constructContext));
}
catch (RdfQueryException)
{
//If we get an error here then we could not construct a specific triple
//so we continue anyway
}
}
}
catch (RdfQueryException)
{
//If we get an error here this means we couldn't construct for this solution so the
//entire solution is discarded
continue;
}
//h.Assert(constructedTriples);
}
rdfHandler.EndRdf(true);
}
catch (RdfParsingTerminatedException)
{
rdfHandler.EndRdf(true);
}
catch
{
rdfHandler.EndRdf(false);
throw;
}
break;
case SparqlQueryType.Describe:
case SparqlQueryType.DescribeAll:
//For DESCRIBE we retrieve the Describe algorithm and apply it
ISparqlDescribe describer = query.Describer;
describer.Describe(rdfHandler, context);
break;
default:
throw new RdfQueryException("Unknown query types cannot be processed by Leviathan");
}
}
finally
{
if (defGraphOk)
{
this._dataset.ResetDefaultGraph();
}
if (datasetOk)
{
this._dataset.ResetActiveGraph();
}
}
#if !NO_RWLOCK
}
finally
{
currLock.ExitReadLock();
}
#endif
}
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate.
/// </summary>
/// <param name="rdfHandler">RDF Handler.</param>
/// <param name="resultsHandler">Results Handler.</param>
/// <param name="query">SPARQL Query.</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
_svc.Query(rdfHandler, resultsHandler, query.ToString());
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
}
}
public BrightstarSparqlResultsType ExecuteSparqlQuery(SparqlQuery query, ISerializationFormat targetFormat, Stream resultsStream,
IEnumerable<string> defaultGraphUris )
{
var queryHandler = new SparqlQueryHandler(targetFormat, defaultGraphUris);
// NOTE: streamWriter is not wrapped in a using because we don't want to close resultStream at this point
var streamWriter = new StreamWriter(resultsStream, targetFormat.Encoding);
var resultsType = queryHandler.ExecuteSparql(query, this, streamWriter);
return resultsType;
}
public void SparqlBgpEvaluation()
{
//Prepare the Store
TripleStore store = new TripleStore();
Graph g = new Graph();
FileLoader.Load(g, "Turtle.ttl");
store.Add(g);
SparqlQueryParser parser = new SparqlQueryParser();
SparqlQuery q = parser.ParseFromString(@"PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT * WHERE {?s ?p ?o . ?s rdfs:label ?label}");
Object testResult = store.ExecuteQuery(q);
ISparqlAlgebra testAlgebra = q.ToAlgebra();
if (testResult is SparqlResultSet)
{
SparqlResultSet rset = (SparqlResultSet)testResult;
Console.WriteLine(rset.Count + " Results");
foreach (SparqlResult r in rset)
{
Console.WriteLine(r.ToString());
}
Console.WriteLine();
}
//Create some Triple Patterns
TriplePattern t1 = new TriplePattern(new VariablePattern("?s"), new VariablePattern("?p"), new VariablePattern("?o"));
TriplePattern t2 = new TriplePattern(new VariablePattern("?s"), new NodeMatchPattern(g.CreateUriNode("rdfs:label")), new VariablePattern("?label"));
TriplePattern t3 = new TriplePattern(new VariablePattern("?x"), new VariablePattern("?y"), new VariablePattern("?z"));
TriplePattern t4 = new TriplePattern(new VariablePattern("?s"), new NodeMatchPattern(g.CreateUriNode(":name")), new VariablePattern("?name"));
//Build some BGPs
Bgp selectNothing = new Bgp();
Bgp selectAll = new Bgp(t1);
Bgp selectLabelled = new Bgp(new List <ITriplePattern>()
{
t1, t2
});
Bgp selectAllDisjoint = new Bgp(new List <ITriplePattern>()
{
t1, t3
});
Bgp selectLabels = new Bgp(t2);
Bgp selectNames = new Bgp(t4);
//LeftJoin selectOptionalNamed = new LeftJoin(selectAll, new Optional(selectNames));
LeftJoin selectOptionalNamed = new LeftJoin(selectAll, selectNames);
Union selectAllUnion = new Union(selectAll, selectAll);
Union selectAllUnion2 = new Union(selectAllUnion, selectAll);
Filter selectAllUriObjects = new Filter(selectAll, new UnaryExpressionFilter(new IsUriFunction(new VariableTerm("o"))));
//Test out the BGPs
//Console.WriteLine("{}");
//this.ShowMultiset(selectNothing.Evaluate(new SparqlEvaluationContext(null, store)));
//Console.WriteLine("{?s ?p ?o}");
//this.ShowMultiset(selectAll.Evaluate(new SparqlEvaluationContext(null, store)));
//Console.WriteLine("{?s ?p ?o . ?s rdfs:label ?label}");
//SparqlEvaluationContext context = new SparqlEvaluationContext(null, store);
//this.ShowMultiset(selectLabelled.Evaluate(context));
//SparqlResultSet lvnResult = new SparqlResultSet(context);
//Console.WriteLine("{?s ?p ?o . ?x ?y ?z}");
//this.ShowMultiset(selectAllDisjoint.Evaluate(new SparqlEvaluationContext(null, store)));
//Console.WriteLine("{?s ?p ?o . OPTIONAL {?s :name ?name}}");
//this.ShowMultiset(selectOptionalNamed.Evaluate(new SparqlEvaluationContext(null, store)));
Console.WriteLine("{{?s ?p ?o} UNION {?s ?p ?o}}");
this.ShowMultiset(selectAllUnion.Evaluate(new SparqlEvaluationContext(null, new InMemoryDataset(store))));
Console.WriteLine("{{?s ?p ?o} UNION {?s ?p ?o} UNION {?s ?p ?o}}");
this.ShowMultiset(selectAllUnion2.Evaluate(new SparqlEvaluationContext(null, new InMemoryDataset(store))));
Console.WriteLine("{?s ?p ?o FILTER (ISURI(?o))}");
this.ShowMultiset(selectAllUriObjects.Evaluate(new SparqlEvaluationContext(null, new InMemoryDataset(store))));
}
private void CheckQueryParsesInExtended(String query)
{
SparqlQuery q = this._parserExt.ParseFromString(query);
Console.WriteLine("Query Parses under SPARQL 1.1 with Extensions as expected");
}
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate.
/// </summary>
/// <param name="rdfHandler">RDF Handler.</param>
/// <param name="resultsHandler">Results Handler.</param>
/// <param name="query">SPARQL Query.</param>
public override void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
query.QueryExecutionTime = null;
var start = DateTime.Now;
try
{
_store.ExecuteQuery(rdfHandler, resultsHandler, _formatter.Format(query));
}
finally
{
var elapsed = (DateTime.Now - start);
query.QueryExecutionTime = elapsed;
}
}
public void SparqlPropertyPathParser()
{
//Load our test data
TripleStore store = new TripleStore();
Graph g = new Graph();
FileLoader.Load(g, "InferenceTest.ttl");
store.Add(g);
List <String> testQueries = new List <string>();
String rdfsPrefix = "PREFIX rdfs: <" + NamespaceMapper.RDFS + ">\n";
//Cardinality Paths
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf* <http://example.org/vehicles/Vehicle>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf+ <http://example.org/vehicles/Vehicle>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf? <http://example.org/vehicles/Vehicle>}");
//testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf{2,4} <http://example.org/vehicles/Vehicle>}");
//testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf{2,} <http://example.org/vehicles/Vehicle>}");
//testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf{,4} <http://example.org/vehicles/Vehicle>}");
//testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf{2} <http://example.org/vehicles/Vehicle>}");
//Simple Inverse Paths
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?type ^a ?entity}");
//Sequence Paths
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf / rdfs:subClassOf <http://example.org/vehicles/Vehicle>}");
//testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf{2} / rdfs:subClassOf <http://example.org/vehicles/Vehicle>}");
//testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf / rdfs:subClassOf{2} <http://example.org/vehicles/Vehicle>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass a / rdfs:subClassOf <http://example.org/vehicles/Plane>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?vehicle a ^ rdfs:subClassOf <http://example.org/vehicles/Plane>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass a / ^ rdfs:subClassOf <http://example.org/vehicles/Vehicle>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?entity a ^ a ?type}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?entity a ^ a / rdfs:subClassOf <http://example.org/vehicles/GroundVehicle>}");
//Alternative Paths
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf | a <http://example.org/vehicles/Vehicle>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass (rdfs:subClassOf | a) | rdfs:someProperty <http://example.org/vehicles/Vehicle>}");
testQueries.Add(rdfsPrefix + "SELECT * WHERE {?subclass rdfs:subClassOf | a | rdfs:someProperty <http://example.org/vehicles/Vehicle>}");
SparqlQueryParser parser = new SparqlQueryParser();
foreach (String query in testQueries)
{
//Parse the Query and output to console
SparqlQuery q = parser.ParseFromString(query);
Console.WriteLine(q.ToString());
//Now we'll try and evaluate it (if this is possible)
try
{
Object results = store.ExecuteQuery(q);
Console.WriteLine("Evaluated OK");
TestTools.ShowResults(results);
Console.WriteLine();
}
catch (RdfQueryException queryEx)
{
Console.WriteLine("Unable to evaluate:");
Console.WriteLine(queryEx.Message);
Console.WriteLine(queryEx.StackTrace);
}
}
}
internal static void Apply(this ISparqlResultsHandler handler, SparqlEvaluationContext context)
{
try
{
handler.StartResults();
SparqlQuery q = context.Query;
SparqlQueryType type;
if (q == null)
{
type = (context.OutputMultiset.Variables.Any() || context.OutputMultiset.Sets.Any() ? SparqlQueryType.Select : SparqlQueryType.Ask);
}
else
{
type = q.QueryType;
}
if (type == SparqlQueryType.Ask)
{
// ASK Query so get the handler to handle an appropriate boolean result
if (context.OutputMultiset is IdentityMultiset)
{
handler.HandleBooleanResult(true);
}
else if (context.OutputMultiset is NullMultiset)
{
handler.HandleBooleanResult(false);
}
else
{
handler.HandleBooleanResult(!context.OutputMultiset.IsEmpty);
}
}
else
{
// SELECT Query so get the handler to handle variables and then handle results
foreach (String var in context.OutputMultiset.Variables)
{
if (!handler.HandleVariable(var))
{
ParserHelper.Stop();
}
}
foreach (ISet s in context.OutputMultiset.Sets)
{
if (!handler.HandleResult(new SparqlResult(s)))
{
ParserHelper.Stop();
}
}
q.VirtualCount = context.OutputMultiset.VirtualCount;
}
handler.EndResults(true);
}
catch (RdfParsingTerminatedException)
{
handler.EndResults(true);
}
catch
{
handler.EndResults(false);
throw;
}
}
/// <summary>
/// Creates a new Evaluation Context for the given Query over the given Dataset using a specific processor
/// </summary>
/// <param name="q">Query</param>
/// <param name="data">Dataset</param>
/// <param name="processor">Query Processor</param>
public SparqlEvaluationContext(SparqlQuery q, ISparqlDataset data, ISparqlQueryAlgebraProcessor <BaseMultiset, SparqlEvaluationContext> processor)
: this(q, data)
{
this._processor = processor;
}
/// <summary>
/// Processes a SPARQL Query asynchronously passing the results to the relevant handler and invoking the callback when the query completes
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query, QueryCallback callback, Object state)
{
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
this._svc.Query(rdfHandler, resultsHandler, query.ToString(), callback, state);
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
}
}
/// <summary>
/// Processes a SPARQL Query
/// </summary>
/// <param name="query">SPARQL Query</param>
/// <returns></returns>
public object ProcessQuery(SparqlQuery query)
{
query.QueryTime = -1;
query.QueryTimeTicks = -1;
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
Object temp = this._svc.Query(query.ToString());
return temp;
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
query.QueryTime = elapsed.Milliseconds;
query.QueryTimeTicks = elapsed.Ticks;
}
}
private void CheckQueryParsesIn11(String query)
{
SparqlQuery q = this._parser11.ParseFromString(query);
Console.WriteLine("Query Parses under SPARQL 1.1 as expected");
}
/// <summary>
/// Determines the Permission Action for a SPARQL Query
/// </summary>
/// <param name="query">Query</param>
/// <returns></returns>
private String GetPermissionAction(SparqlQuery query)
{
switch (query.QueryType)
{
case SparqlQueryType.Ask:
return "ASK";
case SparqlQueryType.Construct:
return "CONSTRUCT";
case SparqlQueryType.Describe:
case SparqlQueryType.DescribeAll:
return "DESCRIBE";
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
return "SELECT";
default:
return String.Empty;
}
}
/// <summary>
/// Processes a SPARQL Query asynchronously passing the results to the relevant handler and invoking the callback when the query completes
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
/// <remarks>
/// In the event of a success the callback will be invoked, if there is an error the callback will be invoked and passed an instance of <see cref="AsyncError"/> which contains details of the error and the original state information passed in.
/// </remarks>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query, QueryCallback callback, Object state)
{
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
switch (query.QueryType)
{
case SparqlQueryType.Ask:
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
this._endpoint.QueryWithResultSet(resultsHandler, this._formatter.Format(query), callback, state);
break;
case SparqlQueryType.Construct:
case SparqlQueryType.Describe:
case SparqlQueryType.DescribeAll:
this._endpoint.QueryWithResultGraph(rdfHandler, this._formatter.Format(query), callback, state);
break;
default:
throw new RdfQueryException("Unable to execute an unknown query type against a Remote Endpoint");
}
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = elapsed;
}
}
/// <summary>
/// Executes a SPARQL Query on the Triple Store
/// </summary>
/// <param name="query">SPARQL Query as a <see cref="SparqlQuery">SparqlQuery</see> instance</param>
/// <returns></returns>
public virtual Object ExecuteQuery(SparqlQuery query)
{
//Invoke Query's Evaluate method
return query.Evaluate(this);
}
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
this._store.ExecuteQuery(rdfHandler, resultsHandler, this._formatter.Format(query));
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = elapsed;
}
}
/// <summary>
/// Creates a new SPARQL View
/// </summary>
/// <param name="sparqlQuery">SPARQL Query</param>
/// <param name="store">Triple Store to query</param>
public NativeSparqlView(SparqlQuery sparqlQuery, INativelyQueryableStore store)
: base(sparqlQuery, store) { }
/// <summary>
/// Creates a new SPARQL View.
/// </summary>
/// <param name="sparqlQuery">SPARQL Query.</param>
/// <param name="store">Triple Store to query.</param>
protected BaseSparqlView(SparqlQuery sparqlQuery, ITripleStore store)
{
_q = sparqlQuery;
_store = store;
Initialise();
}
/// <summary>
/// Processes a SPARQL Query asynchronously invoking the relevant callback when the query completes
/// </summary>
/// <param name="query">SPARQL QUery</param>
/// <param name="rdfCallback">Callback for queries that return a Graph</param>
/// <param name="resultsCallback">Callback for queries that return a Result Set</param>
/// <param name="state">State to pass to the callback</param>
public void ProcessQuery(SparqlQuery query, GraphCallback rdfCallback, SparqlResultsCallback resultsCallback, Object state)
{
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
this._svc.Query(query.ToString(), rdfCallback, resultsCallback, state);
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
}
}
private void SparqlQueryAndUpdateThreadSafeEvaluationActual()
{
String query1 = "CONSTRUCT { ?s ?p ?o } WHERE { GRAPH <http://example.org/1> { ?s ?p ?o } }";
String query2 = "CONSTRUCT { ?s ?p ?o } WHERE { GRAPH <http://example.org/2> { ?s ?p ?o } }";
String query3 = "CONSTRUCT { ?s ?p ?o } WHERE { GRAPH <http://example.org/3> { ?s ?p ?o } }";
String update1 = "INSERT DATA { GRAPH <http://example.org/3> { <ex:subj> <ex:pred> <ex:obj> } }";
SparqlQuery q1 = this._parser.ParseFromString(query1);
SparqlQuery q2 = this._parser.ParseFromString(query2);
SparqlQuery q3 = this._parser.ParseFromString(query3);
Assert.IsFalse(q1.UsesDefaultDataset, "Query 1 should not be thread safe");
Assert.IsFalse(q2.UsesDefaultDataset, "Query 2 should not be thread safe");
Assert.IsFalse(q3.UsesDefaultDataset, "Query 3 should not be thread safe");
SparqlUpdateParser parser = new SparqlUpdateParser();
SparqlUpdateCommandSet cmds = parser.ParseFromString(update1);
InMemoryDataset dataset = new InMemoryDataset();
Graph g = new Graph();
g.LoadFromEmbeddedResource("VDS.RDF.Configuration.configuration.ttl");
g.BaseUri = new Uri("http://example.org/1");
Graph h = new Graph();
h.LoadFromEmbeddedResource("VDS.RDF.Query.Expressions.LeviathanFunctionLibrary.ttl");
h.BaseUri = new Uri("http://example.org/2");
Graph i = new Graph();
i.BaseUri = new Uri("http://example.org/3");
dataset.AddGraph(g);
dataset.AddGraph(h);
dataset.AddGraph(i);
LeviathanQueryProcessor processor = new LeviathanQueryProcessor(dataset);
LeviathanUpdateProcessor upProcessor = new LeviathanUpdateProcessor(dataset);
QueryWithGraphDelegate d = new QueryWithGraphDelegate(this.QueryWithGraph);
RunUpdateDelegate d2 = new RunUpdateDelegate(this.RunUpdate);
IAsyncResult r1 = d.BeginInvoke(q1, processor, null, null);
IAsyncResult r2 = d.BeginInvoke(q2, processor, null, null);
IAsyncResult r3 = d.BeginInvoke(q3, processor, null, null);
IAsyncResult r4 = d2.BeginInvoke(cmds, upProcessor, null, null);
WaitHandle.WaitAll(new WaitHandle[] { r1.AsyncWaitHandle, r2.AsyncWaitHandle, r3.AsyncWaitHandle, r4.AsyncWaitHandle });
IGraph gQuery = d.EndInvoke(r1);
Assert.AreEqual(g, gQuery, "Query 1 Result not as expected");
IGraph hQuery = d.EndInvoke(r2);
Assert.AreEqual(h, hQuery, "Query 2 Result not as expected");
IGraph iQuery = d.EndInvoke(r3);
if (iQuery.IsEmpty)
{
Console.WriteLine("Query 3 executed before the INSERT DATA command - running again to get the resulting graph");
iQuery = this.QueryWithGraph(q3, processor);
}
else
{
Console.WriteLine("Query 3 executed after the INSERT DATA command");
}
//Test iQuery against an empty Graph
Assert.IsFalse(iQuery.IsEmpty, "Graph should not be empty as INSERT DATA should have inserted a Triple");
Assert.AreNotEqual(new Graph(), iQuery, "Graphs should not be equal");
Assert.AreNotEqual(g, h, "Graphs should not be different");
}
/// <summary>
/// Appends the given query as a sub-query to the existing command text, any prefixes in the sub-query are moved to the parent query.
/// </summary>
/// <param name="query">Query.</param>
public void AppendSubQuery(SparqlQuery query)
{
PreprocessText(TrimPreamble(_emptyFormatter.Format(new SubQueryPattern(query))));
// NOTE: the namespaces are already updated through during the TrimPreambule call
}
/// <summary>
/// When overridden in a derived class, processes a SPARQL Query passing the results to the RDF or Results handler as appropriate.
/// </summary>
/// <param name="rdfHandler">RDF Handler.</param>
/// <param name="resultsHandler">Results Handler.</param>
/// <param name="query">SPARQL Query.</param>
public abstract void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler,
SparqlQuery query);
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
#if !SILVERLIGHT
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
switch (query.QueryType)
{
case SparqlQueryType.Ask:
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
this._endpoint.QueryWithResultSet(resultsHandler, this._formatter.Format(query));
break;
case SparqlQueryType.Construct:
case SparqlQueryType.Describe:
case SparqlQueryType.DescribeAll:
this._endpoint.QueryWithResultGraph(rdfHandler, this._formatter.Format(query));
break;
default:
throw new RdfQueryException("Unable to execute an unknown query type against a Remote Endpoint");
}
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = elapsed;
}
#else
throw new NotSupportedException("Synchronous remote query is not supported under Silverlight/WP7 - please use one of the alternative overload of this methods which takes a callback");
#endif
}
/// <summary>
/// Processes a SPARQL Query asynchronously passing the results to the relevant handler and invoking the callback when the query completes.
/// </summary>
/// <param name="rdfHandler">RDF Handler.</param>
/// <param name="resultsHandler">Results Handler.</param>
/// <param name="query">SPARQL Query.</param>
/// <param name="callback">Callback.</param>
/// <param name="state">State to pass to the callback.</param>
/// <remarks>
/// In the event of a success the callback will be invoked, if there is an error the callback will be invoked and passed an instance of <see cref="AsyncError"/> which contains details of the error and the original state information passed in.
/// </remarks>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query, QueryCallback callback, object state)
{
Task.Factory.StartNew(() => ProcessQuery(rdfHandler, resultsHandler, query))
.ContinueWith(antecedent =>
{
if (antecedent.Exception != null)
{
var innerException = antecedent.Exception.InnerExceptions[0];
var queryException = innerException as RdfQueryException ??
new RdfQueryException(
"Unexpected error while making an asynchronous query, see inner exception for details",
innerException);
callback?.Invoke(rdfHandler, resultsHandler, new AsyncError(queryException, state));
}
else
{
callback?.Invoke(rdfHandler, resultsHandler, state);
}
});
}
private SparqlResultSet QueryWithResults(SparqlQuery q, ISparqlQueryProcessor processor)
{
Object results = processor.ProcessQuery(q);
if (results is SparqlResultSet)
{
return (SparqlResultSet)results;
}
else
{
Assert.Fail("Query did not produce a Result Set as expected");
}
return null;
}
public void SparqlGroupBySample()
{
String query = "SELECT ?s (SAMPLE(?o) AS ?object) WHERE {?s ?p ?o} GROUP BY ?s";
SparqlQueryParser parser = new SparqlQueryParser();
SparqlQuery q = parser.ParseFromString(query);
}
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
query.QueryTime = -1;
query.QueryTimeTicks = -1;
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
this._svc.Query(rdfHandler, resultsHandler, query.ToString());
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
query.QueryTime = elapsed.Milliseconds;
query.QueryTimeTicks = elapsed.Ticks;
}
}
public void SparqlGroupByInSubQuery()
{
String query = "SELECT ?s WHERE {{SELECT ?s WHERE {?s ?p ?o} GROUP BY ?s}} GROUP BY ?s";
SparqlQueryParser parser = new SparqlQueryParser();
SparqlQuery q = parser.ParseFromString(query);
}
/// <summary>
/// Processes a Query
/// </summary>
/// <param name="query">Query</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// Implementations should override this method if their behaviour requires more than just invoking the configured Query processor
/// </para>
/// </remarks>
protected virtual Object ProcessQuery(SparqlQuery query)
{
return this._config.Processor.ProcessQuery(query);
}
/// <summary>
/// Creates a new SPARQL View
/// </summary>
/// <param name="sparqlQuery">SPARQL Query</param>
/// <param name="store">Triple Store to query</param>
public SparqlView(SparqlQuery sparqlQuery, IInMemoryQueryableStore store)
: base(sparqlQuery, store)
{
}
public bool IsApplicable(SparqlQuery q)
{
return true;
}
/// <summary>
/// Creates a new SPARQL View
/// </summary>
/// <param name="sparqlQuery">SPARQL Query</param>
/// <param name="store">Triple Store to query</param>
public BaseSparqlView(SparqlQuery sparqlQuery, ITripleStore store)
{
this._q = sparqlQuery;
this._store = store;
this._async = new UpdateViewDelegate(this.UpdateViewInternal);
this.Initialise();
}
/// <summary>
/// Creates a new Evaluation Context for the given Query over the given Dataset using a specific processor
/// </summary>
/// <param name="q">Query</param>
/// <param name="data">Dataset</param>
/// <param name="processor">Query Processor</param>
public SparqlEvaluationContext(SparqlQuery q, ISparqlDataset data, ISparqlQueryAlgebraProcessor<BaseMultiset, SparqlEvaluationContext> processor)
: this(q, data)
{
this._processor = processor;
}
private string MakeQueryCacheKey(string storeName, long commitTime, SparqlQuery query, string[] defaultGraphUris, ISerializationFormat targetFormat)
{
var graphHashCode = defaultGraphUris == null ? 0 : String.Join(",", defaultGraphUris.OrderBy(s=>s)).GetHashCode();
return storeName + "_" + commitTime + "_" + query.GetHashCode() + "_" + graphHashCode + "_" + targetFormat;
}
/// <summary>
/// Executes a SPARQL Query on the Triple Store processing the results with an appropriate handler from those provided
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query as unparsed String</param>
public virtual void ExecuteQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
query.Evaluate(rdfHandler, resultsHandler, this);
}
public BrightstarSparqlResultSet ExecuteSparql(SparqlQuery query, IStore store)
{
try
{
var dataset = new StoreSparqlDataset(store);
if (_defaultGraphUris != null)
{
dataset.SetDefaultGraph(_defaultGraphUris);
}
var queryProcessor = new BrightstarQueryProcessor(store, dataset);
return new BrightstarSparqlResultSet(queryProcessor.ProcessQuery(query));
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.SparqlExecutionError,
"Error Executing Sparql {0}. Cause: {1}",
query, ex);
throw;
}
}
/// <summary>
/// Creates a new SPARQL View
/// </summary>
/// <param name="sparqlQuery">SPARQL Query</param>
/// <param name="store">Triple Store to query</param>
public SparqlView(SparqlQuery sparqlQuery, IInMemoryQueryableStore store)
: base(sparqlQuery, store) { }
/// <summary>
/// Processes a SPARQL Query
/// </summary>
/// <param name="query">SPARQL Query</param>
/// <returns></returns>
public object ProcessQuery(SparqlQuery query)
{
#if !SILVERLIGHT
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
Object temp = this._svc.Query(query.ToString());
return temp;
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
}
#else
throw new NotSupportedException("Synchronous remote query is not supported under Silverlight/WP7 - please use one of the alternative overload of this methods which takes a callback");
#endif
}
/// <summary>
/// Creates a new SPARQL View
/// </summary>
/// <param name="sparqlQuery">SPARQL Query</param>
/// <param name="store">Triple Store to query</param>
public NativeSparqlView(SparqlQuery sparqlQuery, INativelyQueryableStore store)
: base(sparqlQuery, store)
{
}
/// <summary>
/// Processes a SPARQL Query asynchronously passing the results to the relevant handler and invoking the callback when the query completes
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query, QueryCallback callback, Object state)
{
ProcessQueryAsync d = new ProcessQueryAsync(this.ProcessQuery);
d.BeginInvoke(rdfHandler, resultsHandler, query, r =>
{
d.EndInvoke(r);
callback(rdfHandler, resultsHandler, state);
}, state);
}
private static bool QueryReturnsGraph(SparqlQuery query)
{
return (query.QueryType == SparqlQueryType.Construct ||
query.QueryType == SparqlQueryType.Describe ||
query.QueryType == SparqlQueryType.DescribeAll);
}
/// <summary>
/// Creates a new Results Binder
/// </summary>
/// <param name="query">Query this provides Result Binding to</param>
public SparqlResultBinder(SparqlQuery query)
{
this._query = query;
}
private void EnsureValidResultFormat(SparqlQuery query)
{
if (query.QueryType == SparqlQueryType.Construct ||
query.QueryType == SparqlQueryType.Describe ||
query.QueryType == SparqlQueryType.DescribeAll)
{
if (_rdfFormat == null) throw new NoAcceptableFormatException(typeof (RdfFormat),
"CONSTRUCT and DESCRIBE queries require an RdfFormat specifier for the RDF graph serialization.");
}
else if (_sparqlResultsFormat == null)
{
throw new NoAcceptableFormatException(typeof (SparqlResultsFormat),
"Query requires a SparqlResultsFormat specifier for the results serialization.");
}
}
/// <summary>
/// Processes a SPARQL Query sending the results to a RDF/SPARQL Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
// Do Handler null checks before evaluating the query
if (query == null)
{
throw new ArgumentNullException("query", "Cannot evaluate a null query");
}
if (rdfHandler == null && (query.QueryType == SparqlQueryType.Construct || query.QueryType == SparqlQueryType.Describe || query.QueryType == SparqlQueryType.DescribeAll))
{
throw new ArgumentNullException("rdfHandler", "Cannot use a null RDF Handler when the Query is a CONSTRUCT/DESCRIBE");
}
if (resultsHandler == null && (query.QueryType == SparqlQueryType.Ask || SparqlSpecsHelper.IsSelectQuery(query.QueryType)))
{
throw new ArgumentNullException("resultsHandler", "Cannot use a null resultsHandler when the Query is an ASK/SELECT");
}
// Handle the Thread Safety of the Query Evaluation
ReaderWriterLockSlim currLock = (_dataset is IThreadSafeDataset) ? ((IThreadSafeDataset)_dataset).Lock : _lock;
try
{
currLock.EnterReadLock();
// Reset Query Timers
query.QueryExecutionTime = null;
bool datasetOk = false, defGraphOk = false;
try
{
// Set up the Default and Active Graphs
if (query.DefaultGraphs.Any())
{
// Call HasGraph() on each Default Graph but ignore the results, we just do this
// in case a dataset has any kind of load on demand behaviour
foreach (Uri defGraphUri in query.DefaultGraphs)
{
_dataset.HasGraph(defGraphUri);
}
_dataset.SetDefaultGraph(query.DefaultGraphs);
defGraphOk = true;
}
else if (query.NamedGraphs.Any())
{
// No FROM Clauses but one/more FROM NAMED means the Default Graph is the empty graph
_dataset.SetDefaultGraph(Enumerable.Empty <Uri>());
}
_dataset.SetActiveGraph(_dataset.DefaultGraphUris);
datasetOk = true;
// Convert to Algebra and execute the Query
SparqlEvaluationContext context = GetContext(query);
BaseMultiset result;
try
{
context.StartExecution();
ISparqlAlgebra algebra = query.ToAlgebra();
result = context.Evaluate(algebra);
context.EndExecution();
query.QueryExecutionTime = new TimeSpan(context.QueryTimeTicks);
}
catch (RdfQueryException)
{
context.EndExecution();
query.QueryExecutionTime = new TimeSpan(context.QueryTimeTicks);
throw;
}
catch
{
context.EndExecution();
query.QueryExecutionTime = new TimeSpan(context.QueryTimeTicks);
throw;
}
// Return the Results
switch (query.QueryType)
{
case SparqlQueryType.Ask:
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
// For SELECT and ASK can populate a Result Set directly from the Evaluation Context
// return new SparqlResultSet(context);
resultsHandler.Apply(context);
break;
case SparqlQueryType.Construct:
// Create a new Empty Graph for the Results
try
{
rdfHandler.StartRdf();
foreach (String prefix in query.NamespaceMap.Prefixes)
{
if (!rdfHandler.HandleNamespace(prefix, query.NamespaceMap.GetNamespaceUri(prefix)))
{
ParserHelper.Stop();
}
}
// Construct the Triples for each Solution
if (context.OutputMultiset is IdentityMultiset)
{
context.OutputMultiset = new SingletonMultiset();
}
foreach (ISet s in context.OutputMultiset.Sets)
{
// List<Triple> constructedTriples = new List<Triple>();
try
{
ConstructContext constructContext = new ConstructContext(rdfHandler, s, false);
foreach (IConstructTriplePattern p in query.ConstructTemplate.TriplePatterns.OfType <IConstructTriplePattern>())
{
try
{
if (!rdfHandler.HandleTriple(p.Construct(constructContext)))
{
ParserHelper.Stop();
}
// constructedTriples.Add(((IConstructTriplePattern)p).Construct(constructContext));
}
catch (RdfQueryException)
{
// If we get an error here then we could not construct a specific triple
// so we continue anyway
}
}
}
catch (RdfQueryException)
{
// If we get an error here this means we couldn't construct for this solution so the
// entire solution is discarded
continue;
}
// h.Assert(constructedTriples);
}
rdfHandler.EndRdf(true);
}
catch (RdfParsingTerminatedException)
{
rdfHandler.EndRdf(true);
}
catch
{
rdfHandler.EndRdf(false);
throw;
}
break;
case SparqlQueryType.Describe:
case SparqlQueryType.DescribeAll:
// For DESCRIBE we retrieve the Describe algorithm and apply it
ISparqlDescribe describer = query.Describer;
describer.Describe(rdfHandler, context);
break;
default:
throw new RdfQueryException("Unknown query types cannot be processed by Leviathan");
}
}
finally
{
if (defGraphOk)
{
_dataset.ResetDefaultGraph();
}
if (datasetOk)
{
_dataset.ResetActiveGraph();
}
}
}
finally
{
currLock.ExitReadLock();
}
}
public BrightstarSparqlResultsType ExecuteSparql(SparqlQuery query, IStore store, TextWriter resultsWriter)
{
try
{
EnsureValidResultFormat(query);
var dataset = new StoreSparqlDataset(store);
if (_defaultGraphUris != null)
{
dataset.SetDefaultGraph(_defaultGraphUris);
}
var queryProcessor = new BrightstarQueryProcessor(store, dataset);
var queryResult = queryProcessor.ProcessQuery(query);
if (queryResult is SparqlResultSet)
{
var sparqlResultSet = (SparqlResultSet) queryResult;
ISparqlResultsWriter sparqlResultsWriter = null;
if (_sparqlResultsFormat != null)
{
sparqlResultsWriter =
MimeTypesHelper.GetSparqlWriter(new string[] {_sparqlResultsFormat.ToString()});
}
if (sparqlResultsWriter == null)
{
throw new NoAcceptableFormatException(typeof (SparqlResultsFormat),
"No acceptable format provided for writing a SPARQL result set.");
}
sparqlResultsWriter.Save(sparqlResultSet, resultsWriter);
switch (sparqlResultSet.ResultsType)
{
case SparqlResultsType.Boolean:
return BrightstarSparqlResultsType.Boolean;
case SparqlResultsType.VariableBindings:
return BrightstarSparqlResultsType.VariableBindings;
default:
throw new BrightstarInternalException("Unrecognized SPARQL result type");
}
}
if (queryResult is IGraph)
{
var g = (IGraph) queryResult;
var rdfWriter = _rdfFormat == null
? null
: MimeTypesHelper.GetWriter(new string[] {_rdfFormat.ToString()});
if (rdfWriter == null)
{
throw new NoAcceptableFormatException(typeof (RdfFormat),
"No acceptable format provided for writing an RDF graph result.");
}
rdfWriter.Save(g, resultsWriter);
return BrightstarSparqlResultsType.Graph;
}
throw new BrightstarInternalException(
String.Format("Unexpected return type from QueryProcessor.ProcessQuery: {0}",
queryResult.GetType()));
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.SparqlExecutionError,
"Error Executing query {0}. Cause: {1}",
query.ToString(), ex);
throw;
}
}
/// <summary>
/// Processes a SPARQL Query asynchronously passing the results to the relevant handler and invoking the callback when the query completes
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
/// <remarks>
/// In the event of a success the callback will be invoked, if there is an error the callback will be invoked and passed an instance of <see cref="AsyncError"/> which contains details of the error and the original state information passed in.
/// </remarks>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query, QueryCallback callback, Object state)
{
ProcessQueryAsync d = new ProcessQueryAsync(ProcessQuery);
d.BeginInvoke(rdfHandler, resultsHandler, query, r =>
{
try
{
d.EndInvoke(r);
callback(rdfHandler, resultsHandler, state);
}
catch (RdfQueryException queryEx)
{
callback(rdfHandler, resultsHandler, new AsyncError(queryEx, state));
}
catch (Exception ex)
{
callback(rdfHandler, resultsHandler, new AsyncError(new RdfQueryException("Unexpected error making an asynchronous query", ex), state));
}
}, state);
}
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
#if !SILVERLIGHT
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
this._svc.Query(rdfHandler, resultsHandler, query.ToString());
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
}
#else
throw new NotSupportedException("Synchronous remote query is not supported under Silverlight/WP7 - please use one of the alternative overload of this methods which takes a callback");
#endif
}
/// <summary>
/// Creates a new Evaluation Context for the given Query
/// </summary>
/// <param name="q">Query</param>
/// <returns></returns>
private SparqlEvaluationContext GetContext(SparqlQuery q)
{
return(new SparqlEvaluationContext(q, _dataset, GetProcessorForContext()));
}
/// <summary>
/// Processes a SPARQL Query asynchronously passing the results to the relevant handler and invoking the callback when the query completes
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query, QueryCallback callback, Object state)
{
query.QueryExecutionTime = null;
DateTime start = DateTime.Now;
try
{
this._svc.Query(rdfHandler, resultsHandler, query.ToString(), callback, state);
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = (DateTime.Now - start);
}
}
/// <summary>
/// Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate
/// </summary>
/// <param name="rdfHandler">RDF Handler</param>
/// <param name="resultsHandler">Results Handler</param>
/// <param name="query">SPARQL Query</param>
public void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
{
query.QueryExecutionTime = null;
query.QueryTime = -1;
query.QueryTimeTicks = -1;
DateTime start = DateTime.Now;
try
{
this._manager.Query(rdfHandler, resultsHandler, this._formatter.Format(query));
}
finally
{
TimeSpan elapsed = (DateTime.Now - start);
query.QueryExecutionTime = elapsed;
query.QueryTime = elapsed.Milliseconds;
query.QueryTimeTicks = elapsed.Ticks;
}
}
