private IEnumerable <SparqlResult> CreateBindings(SparqlResult variableBinding)
{
this.Subject = this.sVariableNode != null ? variableBinding[this.sVariableNode] : this.Subject;
this.Predicate = this.pVariableNode != null ? variableBinding[this.pVariableNode] : this.Predicate;
this.Object = this.oVariableNode != null ? variableBinding[this.oVariableNode] : this.Object;
if (!this.PrepareKnownVarValues())
{
return(Enumerable.Empty <SparqlResult>());
}
if (!this.isDefaultGraph && this.variableDataSet != null)
{
var graphFromVar = variableBinding[this.variableDataSet.Variable];
this.graphs = graphFromVar != null ? new DataSet()
{
graphFromVar
} : null;
this.isGKnown = this.graphs != null;
}
else
{
this.isGKnown = true;
}
int @case = ((this.Subject != null ? 0 : 1) << 2) | ((this.Predicate != null ? 0 : 1) << 1) | (this.Object != null ? 0 : 1);
if (!this.isDefaultGraph)
{
@case |= 1 << (this.isGKnown ? 3 : 4);
}
return(this.ClearNewValues(this.Subject == null, this.Predicate == null, this.Object == null, !this.isGKnown, variableBinding, this.listOfFilters.Count > 0 ? this.SetVariablesValuesWithFilters(variableBinding, (StoreCallCase)@case) : this.SetVariablesValues(variableBinding, (StoreCallCase)@case)));
}
private IEnumerable <SparqlResult> spoGraphs(SparqlResult variablesBindings)
{
if (this.graphs.Any(g => this.store.NamedGraphs.Contains(this.Subject, this.Predicate, this.Object, g)))
{
yield return(variablesBindings);
}
}
private IEnumerable <SparqlResult> CreateBindings(SparqlResult variableBinding)
{
Subject = sVariableNode != null ? variableBinding[sVariableNode] : Subject;
Predicate = pVariableNode != null ? variableBinding[pVariableNode] : Predicate;
Object = oVariableNode != null ? variableBinding[oVariableNode] : Object;
if (!PrepareKnownVarValues())
{
return(Enumerable.Empty <SparqlResult>());
}
if (!isDefaultGraph && variableDataSet != null)
{
var graphFromVar = variableBinding[variableDataSet.Variable];
graphs = graphFromVar != null ? new DataSet()
{
graphFromVar
} : null;
isGKnown = graphs != null;
}
else
{
isGKnown = true;
}
int @case = ((Subject != null ? 0 : 1) << 2) | ((Predicate != null ? 0 : 1) << 1) | (Object != null ? 0 : 1);
if (!isDefaultGraph)
{
@case |= 1 << (isGKnown ? 3 : 4);
}
return(ClearNewValues(Subject == null, Predicate == null, Object == null, !isGKnown, variableBinding,
listOfFilters.Count > 0 ? SetVariablesValuesWithFilters(variableBinding, (StoreCallCase)@case) : SetVariablesValues(variableBinding, (StoreCallCase)@case)));
}
public IEnumerable<SparqlResult> spOGraphs( ObjectVariants subjNode, ObjectVariants predicateNode,
VariableNode obj, SparqlResult variablesBindings, DataSet graphs)
{
return spOCacheGraphs(subjNode, predicateNode,graphs)
.SelectMany(grouping =>
grouping.Select(node => new SparqlResult(variablesBindings, node, obj)));
}
private void TestDataContractSerialization(SparqlResult r, bool fullEquality)
{
Console.WriteLine("Input: " + r.ToString());
System.IO.StringWriter writer = new System.IO.StringWriter();
DataContractSerializer serializer = new DataContractSerializer(typeof(SparqlResult));
serializer.WriteObject(new XmlTextWriter(writer), r);
Console.WriteLine("Serialized Form:");
Console.WriteLine(writer.ToString());
SparqlResult s = serializer.ReadObject(XmlTextReader.Create(new StringReader(writer.ToString()))) as SparqlResult;
Console.WriteLine("Deserialized Form: " + s.ToString());
Console.WriteLine();
if (fullEquality)
{
Assert.Equal(r, s);
}
else
{
Assert.Equal(r.ToString(), s.ToString());
}
}
protected override void ProcessResult(SparqlResult result)
{
var nvc = new NameValueCollection();
foreach (string varName in varNames)
{
if (!result.HasValue(varName)) continue;
INode resource = result[varName];
if (resource.NodeType == NodeType.Uri)
{
if (string.IsNullOrEmpty(@namespace) || ((IUriNode)resource).ToString().StartsWith(@namespace))
{
nvc[varName] = resource.ToString();
}
}
else if (resource.NodeType == NodeType.Blank && !ignoreBnodes)
{
var bn = resource as BlankNode;
if (string.IsNullOrEmpty(@namespace) || bn.InternalID.StartsWith(@namespace))
{
nvc[varName] = bn.InternalID;
}
}
}
bindings.Add(nvc);
}
protected override void ProcessResult(SparqlResult result)
{
var nvc = new NameValueCollection();
foreach (string varName in varNames)
{
if (!result.HasValue(varName))
{
continue;
}
INode resource = result[varName];
if (resource.NodeType == NodeType.Uri)
{
if (string.IsNullOrEmpty(@namespace) || ((IUriNode)resource).ToString().StartsWith(@namespace))
{
nvc[varName] = resource.ToString();
}
}
else if (resource.NodeType == NodeType.Blank && !ignoreBnodes)
{
var bn = resource as BlankNode;
if (string.IsNullOrEmpty(@namespace) || bn.InternalID.StartsWith(@namespace))
{
nvc[varName] = bn.InternalID;
}
}
}
bindings.Add(nvc);
}
private static bool CompareSolutions(SparqlResult x, SparqlResult y, Dictionary <string, string> bnodeMap)
{
var boundVarsX = x.Variables.Where(v => x.HasValue(v) && x.Value(v) != null);
var boundVarsY = y.Variables.Where(v => y.HasValue(v) && y.Value(v) != null);
if (!boundVarsX.Any() && !boundVarsY.Any())
{
return(true);
}
if (x.Variables.Count().Equals(y.Variables.Count()) &&
x.Variables.All(xv => y.Variables.Contains(xv)))
{
foreach (var xv in x.Variables)
{
var xb = x[xv];
var yb = y[xv];
if (!CompareNodes(xb, yb, bnodeMap))
{
return(false);
}
}
return(true);
}
return(false);
}
public ActionResult SearchDetails(string query)
{
//ako je autor prikazi detalje autora
//inace prikazi detalje filma
if (searchPoFilmu)
{
SparqlResultSet detaljiFilma = endpoint.QueryWithResultSet("PREFIX movie: <http://data.linkedmdb.org/resource/movie/> PREFIX dc: <http://purl.org/dc/terms/> SELECT distinct ?title ?genreName ?dirName ?editorName ?date WHERE {?movie dc:title ?title . ?movie movie:genre ?genre. ?genre movie:film_genre_name ?genreName. ?movie movie:director ?director. ?director movie:director_name ?dirName. ?movie movie:editor ?editor. ?editor movie:editor_name ?editorName. ?movie dc:date ?date FILTER REGEX (?title, '" + query + "', 'i') }ORDER BY ASC(?title) ");
Movie m = new Movie();
if (detaljiFilma.Count > 0)
{
SparqlResult result = detaljiFilma[0];
m.name = ((VDS.RDF.BaseLiteralNode)(result[0])).Value;
m.scenarist = ((VDS.RDF.BaseLiteralNode)(result[2])).Value;
m.redatelj = ((VDS.RDF.BaseLiteralNode)(result[3])).Value;
m.datumNastanka = ((VDS.RDF.BaseLiteralNode)(result[4])).Value;
}
return(View("~/Views/Search/Movie.cshtml", m));
}
if (searchPoGlumcu)
{
Actor actor = new Models.Actor();
return(View("~/Views/Search/Actor.cshtml", actor));
}
return(View("~/Views/Search/NoResult.cshtml"));
}
public Provenance(SparqlResult result)
{
DateAcquired = result.Value("dateAcquired").ToString();
Location = result.Value("location").ToString();
OwnedBy = result.Value("ownerLabel").ToString();
DispayOrder = result.Value("dispayOrder").ToString();
}
public SparqlResponseProperty GetNodeValuesFromSparqlResult(SparqlResult sparqlResult, string value)
{
INode node;
var data = new SparqlResponseProperty();
if (sparqlResult.TryGetValue(value, out node))
{
if (node != null)
{
data.Type = node.NodeType.ToString().ToLower();
switch (node.NodeType)
{
case NodeType.Uri:
data.Value = ((IUriNode)node).Uri.AbsoluteUri;
break;
case NodeType.Blank:
data.Value = ((IBlankNode)node).InternalID;
break;
case NodeType.Literal:
//You may want to inspect the DataType and Language properties and generate
//a different string here
data.Value = ((ILiteralNode)node).Value;
data.DataType = ((ILiteralNode)node).DataType?.OriginalString;
break;
default:
throw new RdfOutputException("Unexpected Node Type");
}
}
}
return(data);
}
private void TestBinarySerialization(SparqlResult r, bool fullEquality)
{
MemoryStream stream = new MemoryStream();
BinaryFormatter serializer = new BinaryFormatter(null, new StreamingContext());
serializer.Serialize(stream, r);
stream.Seek(0, SeekOrigin.Begin);
Console.WriteLine("Serialized Form:");
StreamReader reader = new StreamReader(stream);
Console.WriteLine(reader.ReadToEnd());
stream.Seek(0, SeekOrigin.Begin);
SparqlResult s = serializer.Deserialize(stream) as SparqlResult;
reader.Close();
if (fullEquality)
{
Assert.AreEqual(r, s, "Results should be equal");
}
else
{
Assert.AreEqual(r.ToString(), s.ToString(), "String forms should be equal");
}
stream.Dispose();
}
private void TestXmlSerialization(SparqlResult r, bool fullEquality)
{
Console.WriteLine("Input: " + r.ToString());
System.IO.StringWriter writer = new System.IO.StringWriter();
XmlSerializer serializer = new XmlSerializer(typeof(SparqlResult));
serializer.Serialize(writer, r);
Console.WriteLine("Serialized Form:");
Console.WriteLine(writer.ToString());
SparqlResult s = serializer.Deserialize(new StringReader(writer.ToString())) as SparqlResult;
Console.WriteLine("Deserialized Form: " + s.ToString());
Console.WriteLine();
if (fullEquality)
{
Assert.AreEqual(r, s, "Results should be equal");
}
else
{
Assert.AreEqual(r.ToString(), s.ToString(), "String forms should be equal");
}
}
/// <summary>
/// Extracts the corresponding value from the SemWeb results for a member access projection.
/// </summary>
/// <param name="vb">The SemWeb results.</param>
/// <returns>the value that was extracted (and converted) from the results.</returns>
private object ExtractMemberAccess(SparqlResult vb)
{
// work out if the SelectExpression really is a member access
var ue = (SelectExpression).Arguments[1] as UnaryExpression;
if (ue == null)
{
throw new ArgumentException("incompatible expression type");
}
var le = ue.Operand as LambdaExpression;
if (le == null)
{
throw new LinqToRdfException("Incompatible expression type found when building ontology projection");
}
if (le.Body is MemberExpression)
{
// work out which member is being queried on
var memberExpression = (MemberExpression)le.Body;
MemberInfo memberInfo = memberExpression.Member;
// get its name and use that as a key into the results
//string vVal = vb[memberInfo.Name].ToString();
// convert the result from XSDT format to .NET types
if (!vb.HasValue(memberInfo.Name))
{
return(null);
}
var tc = new XsdtTypeConverter();
return(tc.Parse(vb[memberInfo.Name]));
//return tc.Parse(vVal);
}
return(null);
}
/// <summary>
/// Assigns the instance URI from the SPARQL result bindings.
/// </summary>
/// <param name="obj">The object to assign the URI to.</param>
/// <param name="queryAlias">The query alias that was used in LINQ and SPARQL.</param>
/// <param name="semwebResult">The semweb result to take the value from.</param>
private void AssignInstanceUri(OwlInstanceSupertype obj, string queryAlias,
SparqlResult result)
{
// if there is no alias, then there's no way to work out what contains the instance URI
if (string.IsNullOrEmpty(queryAlias))
{
return;
}
// if there is a binding with the same name as the alias
if (result.Variables.Contains(queryAlias))
{
// get string representation of the instance URI
string uri = result[queryAlias].ToString();
// is it enclosed in angle brackets? then strip them.
if (uri.StartsWith("<") && uri.EndsWith(">"))
{
uri = uri.Substring(1, uri.Length - 2);
}
// can this be parsed as a URI? if so then assign to instance URI property of obj
if (Uri.IsWellFormedUriString(uri, UriKind.RelativeOrAbsolute))
{
obj.InstanceUri = uri;
}
}
}
public IEnumerable <SparqlResult> spO(ObjectVariants subjNode, ObjectVariants predicateNode,
VariableNode obj, SparqlResult variablesBindings)
{
return(store.GetTriplesWithSubjectPredicate(subjNode, predicateNode)
.ToArray()
.Select(node => variablesBindings.Add(node, obj)));
}
static void Main()
{
var parser = new Notation3Parser();
var graph = new Graph();
Console.WriteLine("Loading Notation-3 file.");
//parser.Load(graph, @"n3\ontology.n3");
parser.Load(graph, @"n3\converter.n3");
Console.WriteLine("Loaded Notation-3 file.");
Console.WriteLine("Nodes:");
foreach (Triple triple in graph.Triples)
{
Console.WriteLine("{0} {1} {2}", GetNodeString(triple.Subject), GetNodeString(triple.Predicate), GetNodeString(triple.Object));
}
Console.WriteLine();
Console.WriteLine("Results of 'insomnia' query:");
Console.WriteLine();
SparqlResultSet resultSet = graph.ExecuteQuery(getInsomnia) as SparqlResultSet;
if (resultSet != null)
{
Console.WriteLine("Results for variable 'name':");
for (int i = 0; i < resultSet.Count; i++)
{
SparqlResult result = resultSet[i];
Console.WriteLine("{0}. {1}", i + 1, result["name"]);
}
}
Console.ReadLine();
}
private void tryAddPerson(SparqlResult i)
{
if (!People.ContainsKey(i.Value("person")))
{
People.Add(i.Value("person"), i);
}
}
private VisitedPlaceDataObject MapSparqlResultToVisitedPlace(SparqlResult result, bool mapId = true)
{
var visitedPlace = new VisitedPlaceDataObject();
if (mapId)
{
visitedPlace.Id = new Guid((result.Where(r => r.Key == "VisitedPlace").Single().Value as UriNode).Uri.Fragment.TrimStart('#'));
}
visitedPlace.Date = DateTime.ParseExact((result.Where(r => r.Key == "Date").Single().Value as BaseLiteralNode).Value, "yyyy-MM-dd", CultureInfo.InvariantCulture);
visitedPlace.Description = (result.Where(r => r.Key == "Description").Single().Value as BaseLiteralNode)?.Value;
if (result.Where(r => r.Key == "PlaceOrCountry").Count() == 1)
{
visitedPlace.Typeofplace = (PlaceTypesEnum)Enum.Parse(typeof(PlaceTypesEnum), (result.Where(r => r.Key == "PlaceOrCountry").Single().Value as BaseLiteralNode)?.Value);
}
if (result.Where(r => r.Key == "CountryURI").Count() == 1)
{
visitedPlace.CountryURI = (result.Where(r => r.Key == "CountryURI").Single().Value as UriNode).Uri.ToString();
}
if (result.Where(r => r.Key == "PlaceURI").Count() == 1)
{
visitedPlace.PlaceURI = (result.Where(r => r.Key == "PlaceURI").Single().Value as UriNode).Uri.ToString();
}
visitedPlace.IsNew = false;
visitedPlace.IsDirty = false;
return(visitedPlace);
}
public IEnumerable<SparqlResult> spoGraphs(ObjectVariants subjectNode, ObjectVariants predicateNode, ObjectVariants objectNode,
SparqlResult variablesBindings, DataSet graphs)
{
if (spoGraphsCache(subjectNode, predicateNode, objectNode, graphs).Any())
yield return variablesBindings;
}
private IEnumerable <SparqlResult> CreateBindings(SparqlResult variableBinding)
{
Subject = sVariableNode != null ? variableBinding[sVariableNode] : Subject;
Predicate = pVariableNode != null ? variableBinding[pVariableNode] : Predicate;
Object = oVariableNode != null ? variableBinding[oVariableNode] : Object;
if (!isDefaultGraph && variableDataSet != null)
{
var graphFromVar = variableBinding[variableDataSet.Variable];
graphs = graphFromVar != null ? new DataSet()
{
graphFromVar
} : null;
isGKnown = graphs != null;
}
else
{
isGKnown = true;
}
int @case = ((Subject != null ? 0 : 1) << 2) | ((Predicate != null ? 0 : 1) << 1) | (Object != null ? 0 : 1);
if (!isDefaultGraph)
{
@case |= 1 << (isGKnown ? 3 : 4);
}
return(SetVariablesValues(variableBinding, (StoreCallCase)@case));
}
private IEnumerable <SparqlResult> spoGraphs(SparqlResult variablesBindings)
{
if (graphs.Any(g => q.Store.NamedGraphs.Contains(Subject, Predicate, Object, g)))
{
yield return(variablesBindings);
}
}
public IEnumerable <SparqlResult> spOGraphs(ObjectVariants subjNode, ObjectVariants predicateNode,
VariableNode obj, SparqlResult variablesBindings, DataSet graphs)
{
return(graphs.SelectMany(graph => store
.NamedGraphs
.GetObject(subjNode, predicateNode, graph) // if graphs is empty, Gets All named graphs
.Select(o => variablesBindings.Add(o, obj))));
}
public IEnumerable <SparqlResult> spoVarGraphs(ObjectVariants subjectNode, ObjectVariants predicateNode, ObjectVariants objectNode,
SparqlResult variablesBindings, VariableDataSet graphs)
{
return((graphs.Any()
? graphs.Where(g => store.NamedGraphs.Contains(subjectNode, predicateNode, objectNode, g))
: store.NamedGraphs.GetGraph(subjectNode, predicateNode, objectNode))
.Select(g => variablesBindings.Add(g, graphs.Variable)));
}
public static T GetNode <T>(this SparqlResult result, string variable) where T : class
{
if (result.TryGetValue(variable, out INode subNode))
{
return(subNode as T);
}
return(default(T));
}
public IEnumerable <SparqlResult> sPOGraphs(ObjectVariants subj, VariableNode pred,
VariableNode obj, SparqlResult variablesBindings, DataSet graphs)
{
return(graphs.SelectMany(g => store
.NamedGraphs
.GetTriplesWithSubjectFromGraph(subj, g, (p, o) =>
variablesBindings.Add(p, pred, o, obj))));
}
/// <summary>
/// Creates a new Set from a SPARQL Result
/// </summary>
/// <param name="result">Result</param>
internal Set(SparqlResult result)
{
this._values = new Dictionary <string, INode>();
foreach (String var in result.Variables)
{
this.Add(var, result[var]);
}
}
/// <summary>
/// Handlers SPARQL Results
/// </summary>
/// <param name="result">Result</param>
/// <returns></returns>
public bool HandleResult(SparqlResult result)
{
if (!this._inUse)
{
throw new RdfParseException("Cannot Handle a Result as this Handler is not currently in-use");
}
return(this.HandleResultInternal(result));
}
private Func <TripleIntOV, SparqlResult> Selector(SparqlResult sparqlResult, VariableNode variable)
{
return(t =>
{
sparqlResult[variable] = t.Object;
return sparqlResult;
});
}
public static SearchResult ToSearchResult(this SparqlResult result)
{
return(new SearchResult()
{
Title = result.GetNode <LiteralNode>("t")?.Value,
Excerpt = result.GetNode <LiteralNode>("e")?.Value,
Url = result.GetNode <LiteralNode>("u")?.Value
});
}
/// <summary>
/// Initializes a new instance of the <see cref="DynamicSparqlResult"/> class.
/// </summary>
/// <param name="original">The SPARQL result to wrap.</param>
/// <exception cref="ArgumentNullException">When <paramref name="original"/> is null.</exception>
public DynamicSparqlResult(SparqlResult original)
{
if (original is null)
{
throw new ArgumentNullException(nameof(original));
}
this.original = original;
}
protected override void ProcessResult(SparqlResult result)
{
foreach (String variable in result.Variables)
{
if (result.HasValue(variable))
{
Logger.Debug("?{0} => <{1}>", variable, result[variable]);
}
}
}
/// <summary>
/// Formats a SPARQL Result
/// </summary>
/// <param name="result">SPARQL Result</param>
/// <returns></returns>
public string Format(SparqlResult result)
{
StringBuilder output = new StringBuilder();
output.AppendLine(" <result>");
foreach (String var in result.Variables)
{
if (result.HasValue(var))
{
INode value = result[var];
if (value != null)
{
output.Append(" <binding name=\"" + var + "\">");
switch (value.NodeType)
{
case NodeType.Blank:
output.Append("<bnode>" + ((IBlankNode)value).InternalID + "</bnode>");
break;
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("SPARQL XML Results"));
case NodeType.Literal:
ILiteralNode lit = (ILiteralNode)value;
output.Append("<literal");
if (lit.DataType != null)
{
output.Append(" datatype=\"" + WriterHelper.EncodeForXml(lit.DataType.ToString()) + "\">" + WriterHelper.EncodeForXml(lit.Value) + "</literal>");
}
else if (!lit.Language.Equals(String.Empty))
{
output.Append(" xml:lang=\"" + lit.Language + "\">" + lit.Value + "</literal>");
}
else
{
output.Append(">" + WriterHelper.EncodeForXml(lit.Value) + "</literal>");
}
break;
case NodeType.Uri:
output.Append("<uri>" + WriterHelper.EncodeForXml(value.ToString()) + "</uri>");
break;
case NodeType.Variable:
throw new RdfOutputException(WriterErrorMessages.VariableNodesUnserializable("SPARQL XML Results"));
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("SPARQL XML Results"));
}
output.AppendLine("</binding>");
}
}
}
output.Append(" </result>");
return output.ToString();
}
/// <summary>
/// Handles a Result by adding it to the Result Set
/// </summary>
/// <param name="result">Result</param>
/// <returns></returns>
protected override bool HandleResultInternal(SparqlResult result)
{
this._results.AddResult(result);
return true;
}
/// <summary>
/// A callback interface that gets called by SemWeb when results are sent
/// back from a remote SPARQL source. This gets each unique set of bindings
/// in turn. It can either store the results or deserialise them on the spot.
/// </summary>
/// <returns>true if the deserialiser was able to use the result or false otherwise</returns>
protected override void ProcessResult(SparqlResult result)
{
#region Tracing
#line hidden
if (Logger.IsDebugEnabled)
{
Logger.Debug("Got Result {0}.", result.ToString());
}
#line default
#endregion
if (IsSelectMember(SelectExpression))
{
IncomingResults.Add(ExtractMemberAccess(result));
return;
}
if (originalType == null) throw new LinqToRdfException("need ontology type to create");
object t;
IEnumerable<MemberInfo> props = GetPropertiesToPopulate(originalType, instanceType);
if (originalType == instanceType)
{
#region not using a projection
t = Activator.CreateInstance(instanceType);
#region Tracing
#line hidden
if (Logger.IsDebugEnabled)
{
Logger.Debug("created new instance of {0}.", t.GetType().Name);
}
#line default
#endregion
AssignDataContext(t as OwlInstanceSupertype, DataContext);
AssignInstanceUri(t as OwlInstanceSupertype, InstanceName, result);
foreach (PropertyInfo pi in props)
{
if (pi.PropertyType.IsGenericType &&
pi.PropertyType.GetGenericTypeDefinition().Name.StartsWith("Entity"))
continue;
try
{
PopulateProperty(result, t, pi);
}
catch (ArgumentException ae)
{
#region Tracing
#line hidden
if (Logger.IsErrorEnabled)
{
Logger.ErrorEx("Unable to populate property " + pi.Name, ae);
Logger.Error("continuing");
}
#line default
#endregion
}
catch (Exception e)
{
#region Tracing
#line hidden
if (Logger.IsErrorEnabled)
{
Logger.ErrorEx("Unable to populate property " + pi.Name, e);
}
#line default
#endregion
return;
}
}
#endregion
}
else
{
#region using a projection
var args = new List<object>();
foreach (PropertyInfo pi in props)
{
try
{
if (result.HasValue(pi.Name))
{
if (result[pi.Name] != null)
{
string vVal = result[pi.Name].ToString();
vVal = RemoveEnclosingQuotesOnString(vVal, pi);
if (IsXsdtEncoded(vVal))
vVal = DecodeXsdtString(vVal);
args.Add(Convert.ChangeType(vVal, pi.PropertyType));
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
return;
}
}
t = Activator.CreateInstance(instanceType, args.ToArray());
#endregion
}
if (Distinct)
{
if (ObjectIsUniqueSoFar(t as OwlInstanceSupertype))
IncomingResults.Add(t);
}
else
IncomingResults.Add(t);
return;
}
/// <summary>
/// Parses the XML Result Set format into a set of SPARQLResult objects
/// </summary>
/// <param name="context">Parser Context</param>
private void Parse(SparqlXmlParserContext context)
{
try
{
context.Handler.StartResults();
//Get the Document Element and check it's a Sparql element
if (!context.Input.Read()) throw new RdfParseException("Unable to Parse a SPARQL Result Set as it was not possible to read a document element from the input");
while (context.Input.NodeType != XmlNodeType.Element)
{
if (!context.Input.Read()) throw new RdfParseException("Unable to Parse a SPARQL Result Set as it was not possible to read a document element from the input");
}
if (!context.Input.Name.Equals("sparql"))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set from the provided XML since the Document Element is not a <sparql> element!");
}
//Go through it's attributes and check the Namespace is specified
bool nsfound = false;
if (context.Input.HasAttributes)
{
for (int i = 0; i < context.Input.AttributeCount; i++)
{
context.Input.MoveToNextAttribute();
if (context.Input.Name.Equals("xmlns"))
{
if (!context.Input.Value.Equals(SparqlSpecsHelper.SparqlNamespace))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the <sparql> element has an incorrect Namespace!");
}
else
{
nsfound = true;
}
}
}
}
if (!nsfound)
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the <sparql> element fails to specify the SPARQL Namespace!");
}
//Get the Variables from the Header
if (!context.Input.Read()) throw new RdfParseException("Unable to Parse a SPARQL Result Set as could not read a <head> element from the input");
if (!context.Input.Name.Equals("head"))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the first Child Node of the <sparql> element is not the required <head> element!");
}
//Only parser <variable> and <link> elements if not an empty <head /> element
if (!context.Input.IsEmptyElement)
{
while (context.Input.Read())
{
//Stop reading when we hit the </head>
if (context.Input.NodeType == XmlNodeType.EndElement && context.Input.Name.Equals("head")) break;
//Looking for <variable> elements
if (context.Input.Name.Equals("variable"))
{
//Should only have 1 attribute
if (context.Input.AttributeCount != 1)
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since a <variable> element has too few/many attributes, only a 'name' attribute should be present!");
}
else
{
//Add the Variable to the list
context.Input.MoveToNextAttribute();
if (!context.Handler.HandleVariable(context.Input.Value)) ParserHelper.Stop();
context.Variables.Add(context.Input.Value);
}
}
else if (context.Input.Name.Equals("link"))
{
//Not bothered about <link> elements
}
else
{
//Some unexpected element
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the <head> contains an unexpected element <" + context.Input.Name + ">!");
}
}
}
if (!context.Input.Name.Equals("head"))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set as reached the end of the input before the closing </head> element was found");
}
//Look at the <results> or <boolean> element
if (!context.Input.Read()) throw new RdfParseException("Unable to Parse a SPARQL Result Set as could not read a <results> element from the input");
if (context.Input.Name.Equals("results"))
{
//Only parser <result> elements if it's not an empty <results /> element
if (!context.Input.IsEmptyElement)
{
while (context.Input.Read())
{
//Stop reading when we hit the </results>
if (context.Input.NodeType == XmlNodeType.EndElement && context.Input.Name.Equals("results")) break;
//Must be a <result> element
if (!context.Input.Name.Equals("result"))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the <results> element contains an unexpected element <" + context.Input.Name + ">!");
}
//Empty Elements generate an Empty Result
if (context.Input.IsEmptyElement)
{
if (!context.Handler.HandleResult(new SparqlResult())) ParserHelper.Stop();
continue;
}
//Get the values of each Binding
String var;
INode value;
SparqlResult result = new SparqlResult();
while (context.Input.Read())
{
//Stop reading when we hit the </binding>
if (context.Input.NodeType == XmlNodeType.EndElement && context.Input.Name.Equals("result")) break;
//Must be a <binding> element
if (!context.Input.Name.Equals("binding"))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since a <result> element contains an unexpected element <" + context.Input.Name + ">!");
}
//Must have only 1 attribute
if (context.Input.AttributeCount != 1)
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since a <binding> element has too few/many attributes, only a 'name' attribute should be present!");
}
//Get the Variable this is a binding for and its Value
context.Input.MoveToNextAttribute();
var = context.Input.Value;
if (!context.Input.Read()) throw new RdfParseException("Unable to Parse a SPARQL Result Set as reached the end of input when the contents of a <binding> element was expected");
value = this.ParseValue(context);
//Check that the Variable was defined in the Header
if (!context.Variables.Contains(var))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since a <binding> element attempts to bind a value to the variable '" + var + "' which is not defined in the <head> by a <variable> element!");
}
//Set the Variable to the Value
result.SetValue(var, value);
}
//Check that all Variables are bound for a given result binding nulls where appropriate
foreach (String v in context.Variables)
{
if (!result.HasValue(v))
{
result.SetValue(v, null);
}
}
if (!context.Input.Name.Equals("result"))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set as reached the end of the input before a closing </result> element was found");
}
//Add to results set
if (!context.Handler.HandleResult(result)) ParserHelper.Stop();
}
}
if (!context.Input.Name.Equals("results"))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set as reached the end of the input before the closing </results> element was found");
}
}
else if (context.Input.Name.Equals("boolean"))
{
//Can't be any <variable> elements
if (context.Variables.Count > 0)
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the <boolean> element is specified but the <head> contained one/more <variable> elements which is not permitted!");
}
try
{
//Get the value of the <boolean> element as a Boolean
Boolean b = Boolean.Parse(context.Input.ReadInnerXml());
context.Handler.HandleBooleanResult(b);
}
catch (Exception)
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the <boolean> element contained a value that could not be understood as a Boolean value!");
}
}
else
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since the second Child Node of the <sparql> element is not the required <results> or <boolean> element!");
}
context.Handler.EndResults(true);
}
catch (RdfParsingTerminatedException)
{
context.Handler.EndResults(true);
}
catch
{
//Some other Error
context.Handler.EndResults(false);
throw;
}
}
private static bool CompareSolutions(SparqlResult x, SparqlResult y)
{
if (x.Variables.Count().Equals(y.Variables.Count()) &&
x.Variables.All(xv=>y.Variables.Contains(xv)))
{
foreach (var xv in x.Variables)
{
var xb = x[xv];
var yb = y[xv];
if (!CompareNodes(xb, yb)) return false;
}
return true;
}
return false;
}
private static int scorecalc(string keyword, SparqlResult singleuri)
{
List<string> disambiguate_links = new List<string>();
string check_disambig;
int score_redirect = 0;
int score_resource = 0;
SparqlResultSet result;
score_resource = computeLevenshteinDistance(keyword, singleuri.Value("literal").ToString().Replace("@en", ""));
if (singleuri.Value("redirects") != null)
{
if (disambiguate_links.Contains(singleuri.Value("redirects").ToString()))
return 1000;
check_disambig = "ASK where {<" + util.encodeURI(singleuri.Value("redirects").ToString()) + "> <http://dbpedia.org/ontology/wikiPageDisambiguates> ?disamb }";
result = Request.RequestWithHTTP(check_disambig);
if (result.Result == true)
{
disambiguate_links.Add(singleuri.Value("redirects").ToString());
return 1000;
}
string redirect_query = "select * where{ <" + singleuri.Value("redirects").ToString() + "><http://www.w3.org/2000/01/rdf-schema#label> ?redirect_label}";
result = Request.RequestWithHTTP(redirect_query);
if (result.Count != 0)
{
score_redirect = computeLevenshteinDistance(keyword, result[0].Value("redirect_label").ToString().Replace("@en", ""));
return (score_redirect <= score_resource ? score_redirect : score_resource);
}
else
{
return score_resource;
}
}
return score_resource;
}
private void TryParseResultRow(TokenisingResultParserContext context)
{
IToken next = context.Tokens.Peek();
if (next.TokenType == Token.EOF)
{
context.Tokens.Dequeue();
return;
}
bool allowEOL = true, expectTab = false;
int v = 0;
SparqlResult result = new SparqlResult();
while (true)
{
next = context.Tokens.Dequeue();
switch (next.TokenType)
{
case Token.URI:
if (expectTab) throw ParserHelper.Error("Unexpected URI, expected a Tab between RDF Terms", next);
if (v >= context.Variables.Count) throw ParserHelper.Error("Too many RDF Terms, only expecting " + context.Variables.Count + " terms", next);
INode uri = ParserHelper.TryResolveUri(context, next);
result.SetValue(context.Variables[v], uri);
v++;
allowEOL = true;
expectTab = true;
break;
case Token.BLANKNODEWITHID:
if (expectTab) throw ParserHelper.Error("Unexpected Blank Node, expected a Tab between RDF Terms", next);
if (v >= context.Variables.Count) throw ParserHelper.Error("Too many RDF Terms, only expecting " + context.Variables.Count + " terms", next);
INode blank = context.Handler.CreateBlankNode(next.Value.Substring(2));
result.SetValue(context.Variables[v], blank);
v++;
allowEOL = true;
expectTab = true;
break;
case Token.LITERAL:
case Token.LONGLITERAL:
case Token.PLAINLITERAL:
if (expectTab) throw ParserHelper.Error("Unexpected Blank Node, expected a Tab between RDF Terms", next);
if (v >= context.Variables.Count) throw ParserHelper.Error("Too many RDF Terms, only expecting " + context.Variables.Count + " terms", next);
INode lit = this.TryParseLiteral(context, next);
result.SetValue(context.Variables[v], lit);
v++;
allowEOL = true;
expectTab = true;
break;
case Token.EOL:
if (allowEOL)
{
break;
}
else
{
if (v == context.Variables.Count - 1)
{
//If this is the last expected term then this must be an empty term
v++;
break;
}
throw ParserHelper.Error("Unexpected End of Line, expected a RDF Term Token", next);
}
case Token.TAB:
if (!expectTab)
{
//This is an empty field
if (v >= context.Variables.Count) throw ParserHelper.Error("Too many RDF Terms, only expecting " + context.Variables.Count + " terms", next);
v++;
}
expectTab = false;
allowEOL = false;
break;
case Token.EOF:
if (!allowEOL) throw ParserHelper.Error("Unexpected EOF, expected another RDF Term for the Result Row", next);
break;
default:
throw ParserHelper.Error("Unexpected Token '" + next.GetType().ToString() + "' encountered", next);
}
//Stop when we've hit the End of the Line/File
if (next.TokenType == Token.EOL || next.TokenType == Token.EOF) break;
}
if (!context.Handler.HandleResult(result)) ParserHelper.Stop();
}
/// <summary>
/// Parser method which parses a Bound Variable Object which occurs within a Binding Object
/// </summary>
/// <param name="context">Parser Context</param>
/// <param name="var">Variable Name</param>
/// <param name="r">Result Object that is being constructed from the Binding Object</param>
private void ParseBoundVariable(SparqlJsonParserContext context, String var, SparqlResult r)
{
String token, nodeValue, nodeType, nodeLang, nodeDatatype;
nodeValue = nodeType = nodeLang = nodeDatatype = null;
//Can we read the start of an Object
if (context.Input.Read())
{
if (context.Input.TokenType == JsonToken.StartObject)
{
context.Input.Read();
while (context.Input.TokenType != JsonToken.EndObject)
{
token = context.Input.Value.ToString().ToLower();
//Check that we get a Property Value as a String
context.Input.Read();
if (context.Input.TokenType != JsonToken.String)
{
throw Error(context, "Unexpected Token '" + context.Input.TokenType.ToString() + "' encountered, expected a Property Value describing one of the properties of an Variable Binding");
}
//Extract the Information from the Object
if (token.Equals("value"))
{
nodeValue = context.Input.Value.ToString();
}
else if (token.Equals("type"))
{
nodeType = context.Input.Value.ToString().ToLower();
}
else if (token.Equals("lang") || token.Equals("xml:lang"))
{
if (nodeLang == null && nodeDatatype == null)
{
nodeLang = context.Input.Value.ToString();
}
else
{
throw Error(context, "Unexpected Language Property specified for an Object Node where a Language or Datatype has already been specified");
}
}
else if (token.Equals("datatype"))
{
if (nodeDatatype == null && nodeLang == null)
{
nodeDatatype = context.Input.Value.ToString();
}
else
{
throw Error(context, "Unexpected Datatype Property specified for an Object Node where a Language or Datatype has already been specified");
}
}
else
{
throw Error(context, "Unexpected Property '" + token + "' specified for an Object Node, only 'value', 'type', 'lang' and 'datatype' are valid properties");
}
//Get Next Token
if (!context.Input.Read())
{
throw new RdfParseException("Unexpected End of Input while trying to parse a Bound Variable Object");
}
}
//Validate the Information
if (nodeType == null)
{
throw new RdfParseException("Cannot parse a Node from the JSON where no 'type' property was specified in the JSON Object representing the Node");
}
if (nodeValue == null)
{
throw new RdfParseException("Cannot parse a Node from the JSON where no 'value' property was specified in the JSON Object representing the Node");
}
//Turn this information into a Node
INode n;
if (nodeType.Equals("uri"))
{
n = context.Handler.CreateUriNode(new Uri(nodeValue));
}
else if (nodeType.Equals("bnode"))
{
if (nodeValue.StartsWith("_:"))
{
n = context.Handler.CreateBlankNode(nodeValue.Substring(2));
}
else if (nodeValue.Contains("://"))
{
n = context.Handler.CreateBlankNode(nodeValue.Substring(nodeValue.IndexOf("://") + 3));
}
else if (nodeValue.Contains(":"))
{
n = context.Handler.CreateBlankNode(nodeValue.Substring(nodeValue.LastIndexOf(':') + 1));
}
else
{
n = context.Handler.CreateBlankNode(nodeValue);
}
}
else if (nodeType.Equals("literal") || nodeType.Equals("typed-literal"))
{
if (nodeLang != null)
{
n = context.Handler.CreateLiteralNode(nodeValue, nodeLang);
}
else if (nodeDatatype != null)
{
n = context.Handler.CreateLiteralNode(nodeValue, new Uri(nodeDatatype));
}
else
{
n = context.Handler.CreateLiteralNode(nodeValue);
}
}
else
{
throw new RdfParseException("Cannot parse a Node from the JSON where the 'type' property has a value of '" + nodeType + "' which is not one of the permitted values 'uri', 'bnode', 'literal' or 'typed-literal' in the JSON Object representing the Node");
}
//Check that the Variable was defined in the Header
if (!context.Variables.Contains(var))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since a Binding Object attempts to bind a value to the variable '" + var + "' which is not defined in the Header Object in the value for the 'vars' property!");
}
//Add to the result
r.SetValue(var, n);
}
else
{
throw Error(context, "Unexpected Token '" + context.Input.TokenType.ToString() + "' encountered, expected the start of a Bound Variable Object");
}
}
else
{
throw Error(context, "Unexpected End of Input while trying to parse a Bound Variable Object");
}
}
public MySparqlResult(SparqlResult sr)
{
Data.Set(sr);
}
/// <summary>
/// Extracts the corresponding value from the SemWeb results for a member access projection.
/// </summary>
/// <param name="vb">The SemWeb results.</param>
/// <returns>the value that was extracted (and converted) from the results.</returns>
private object ExtractMemberAccess(SparqlResult vb)
{
// work out if the SelectExpression really is a member access
var ue = (SelectExpression).Arguments[1] as UnaryExpression;
if (ue == null)
throw new ArgumentException("incompatible expression type");
var le = ue.Operand as LambdaExpression;
if (le == null)
throw new LinqToRdfException("Incompatible expression type found when building ontology projection");
if (le.Body is MemberExpression)
{
// work out which member is being queried on
var memberExpression = (MemberExpression) le.Body;
MemberInfo memberInfo = memberExpression.Member;
// get its name and use that as a key into the results
//string vVal = vb[memberInfo.Name].ToString();
// convert the result from XSDT format to .NET types
if (!vb.HasValue(memberInfo.Name)) return null;
var tc = new XsdtTypeConverter();
return tc.Parse(vb[memberInfo.Name]);
//return tc.Parse(vVal);
}
return null;
}
/// <summary>
/// stores the result from a SemWeb result into a <see cref="PropertyInfo"/> doing whatever conversions are required.
/// </summary>
/// <param name="semwebBindings">The incoming result from semweb.</param>
/// <param name="obj">The object instance on wqhich the property is to be set</param>
/// <param name="propertyInfo">The <see cref="PropertyInfo"/> identifying the property to be populated with the value stored in <see cref="semwebBindings"/>.</param>
public static void PopulateProperty(SparqlResult semwebBindings, object obj, PropertyInfo propertyInfo)
{
if (semwebBindings.HasValue(propertyInfo.Name))
{
if (semwebBindings[propertyInfo.Name] == null) return;
var tc = new XsdtTypeConverter();
object x = tc.Parse(semwebBindings[propertyInfo.Name]);
if (x is IConvertible)
propertyInfo.SetValue(obj, Convert.ChangeType(x, propertyInfo.PropertyType), null);
else
// if it's not convertible, it could be because the type is an MS XSDT type rather than a .NET primitive
if (x.GetType().Namespace == "System.Runtime.Remoting.Metadata.W3cXsd2001")
{
switch (x.GetType().Name)
{
case "SoapDate":
var d = (SoapDate) x;
propertyInfo.SetValue(obj, Convert.ChangeType(d.Value, propertyInfo.PropertyType), null);
break;
default:
break;
}
}
else if (propertyInfo.PropertyType == typeof (string))
{
propertyInfo.SetValue(obj, x.ToString(), null);
}
}
}
private static bool CompareSolutions(SparqlResult x, SparqlResult y, Dictionary<string,string> bnodeMap)
{
var boundVarsX = x.Variables.Where(v=>x.HasValue(v) && x.Value(v)!=null);
var boundVarsY = y.Variables.Where(v=>y.HasValue(v) && y.Value(v)!=null);
if (!boundVarsX.Any() && !boundVarsY.Any()) return true;
if (x.Variables.Count().Equals(y.Variables.Count()) &&
x.Variables.All(xv=>y.Variables.Contains(xv)))
{
foreach (var xv in x.Variables)
{
var xb = x[xv];
var yb = y[xv];
if (!CompareNodes(xb, yb, bnodeMap)) return false;
}
return true;
}
return false;
}
/// <summary>
/// Handlers SPARQL Results
/// </summary>
/// <param name="result">Result</param>
/// <returns></returns>
public bool HandleResult(SparqlResult result)
{
if (!this._inUse) throw new RdfParseException("Cannot Handle a Result as this Handler is not currently in-use");
return this.HandleResultInternal(result);
}
/// <summary> /// Must be overridden by derived handlers to appropriately handler SPARQL Results /// </summary> /// <param name="result">Result</param> /// <returns></returns> protected abstract bool HandleResultInternal(SparqlResult result);
/// <summary>
/// Assigns the instance URI from the SPARQL result bindings.
/// </summary>
/// <param name="obj">The object to assign the URI to.</param>
/// <param name="queryAlias">The query alias that was used in LINQ and SPARQL.</param>
/// <param name="semwebResult">The semweb result to take the value from.</param>
private void AssignInstanceUri(OwlInstanceSupertype obj, string queryAlias,
SparqlResult result)
{
// if there is no alias, then there's no way to work out what contains the instance URI
if (string.IsNullOrEmpty(queryAlias))
{
return;
}
// if there is a binding with the same name as the alias
if (result.Variables.Contains(queryAlias))
{
// get string representation of the instance URI
string uri = result[queryAlias].ToString();
// is it enclosed in angle brackets? then strip them.
if (uri.StartsWith("<") && uri.EndsWith(">"))
{
uri = uri.Substring(1, uri.Length - 2);
}
// can this be parsed as a URI? if so then assign to instance URI property of obj
if (Uri.IsWellFormedUriString(uri, UriKind.RelativeOrAbsolute))
{
obj.InstanceUri = uri;
}
}
}
/// <summary>
/// Formats a SPARQL Result using this Formatter to format the Node values for each Variable
/// </summary>
/// <param name="result">SPARQL Result</param>
/// <returns></returns>
public virtual String Format(SparqlResult result)
{
return result.ToString(this);
}
/// <summary>
/// Parser method which parses a Binding Object which occurs in the array of Bindings
/// </summary>
private void ParseBinding(SparqlJsonParserContext context)
{
//Can we read some properties
if (context.Input.Read())
{
SparqlResult result = new SparqlResult();
while (context.Input.TokenType != JsonToken.EndObject)
{
if (context.Input.TokenType == JsonToken.PropertyName)
{
//Each Property Name should be for a variable
this.ParseBoundVariable(context, context.Input.Value.ToString(), result);
}
else
{
throw Error(context, "Unexpected Token '" + context.Input.TokenType.ToString() + "' encountered, expected a Property Name giving the Binding for a Variable for this Result");
}
//Get Next Token
if (!context.Input.Read())
{
throw new RdfParseException("Unexpected End of Input while trying to parse a Binding Object");
}
}
//Check that all Variables are bound for a given result binding nulls where appropriate
foreach (String v in context.Variables)
{
if (!result.HasValue(v))
{
result.SetValue(v, null);
}
}
//Add to Results
if (!context.Handler.HandleResult(result)) throw ParserHelper.Stop();
}
else
{
throw new RdfParseException("Unexpected End of Input while trying to parse a Binding Object");
}
}
/// <summary>
/// Internal method which actually parses the Result Set by traversing the RDF Graph appropriately
/// </summary>
/// <param name="context">Parser Context</param>
private void Parse(SparqlRdfParserContext context)
{
try
{
context.Handler.StartResults();
//Create relevant Nodes
context.Graph.NamespaceMap.AddNamespace("rdf", new Uri(NamespaceMapper.RDF));
context.Graph.NamespaceMap.AddNamespace("rs", new Uri(SparqlSpecsHelper.SparqlRdfResultsNamespace));
IUriNode rdfType = context.Graph.CreateUriNode("rdf:type");
IUriNode resultSetClass = context.Graph.CreateUriNode("rs:ResultSet");
IUriNode resultVariable = context.Graph.CreateUriNode("rs:resultVariable");
IUriNode solution = context.Graph.CreateUriNode("rs:solution");
IUriNode binding = context.Graph.CreateUriNode("rs:binding");
IUriNode value = context.Graph.CreateUriNode("rs:value");
IUriNode variable = context.Graph.CreateUriNode("rs:variable");
IUriNode boolean = context.Graph.CreateUriNode("rs:boolean");
//Try to get a ResultSet object
Triple rset = context.Graph.Triples.WithPredicateObject(rdfType, resultSetClass).FirstOrDefault();
if (rset != null)
{
INode rsetID = rset.Subject;
//Find the Variables the Result Set contains or the Boolean Value
List<Triple> temp = context.Graph.Triples.WithSubjectPredicate(rsetID, boolean).ToList();
if (temp.Count > 0)
{
if (temp.Count > 1) throw new RdfParseException("Result Set has more than one boolean result defined for it");
Triple booleanResult = temp.First();
INode result = booleanResult.Object;
if (result.NodeType == NodeType.Literal)
{
ILiteralNode lit = (ILiteralNode)result;
if (lit.DataType != null)
{
if (lit.DataType.ToString().Equals(XmlSpecsHelper.XmlSchemaDataTypeBoolean))
{
bool b;
if (Boolean.TryParse(lit.Value, out b))
{
context.Handler.HandleBooleanResult(b);
return;
}
else
{
throw new RdfParseException("Result Set has a boolean result which is a Literal typed as boolean but which does not contain a valid boolean value");
}
}
else
{
throw new RdfParseException("Result Set has a boolean result which is a Literal which is not boolean typed");
}
}
else
{
throw new RdfParseException("Result Set has a boolean result which is a Literal which is not typed as a boolean");
}
}
else
{
throw new RdfParseException("Result Set has a boolean result which is not a Literal Node");
}
}
else
{
//We're expected one/more variables
temp = context.Graph.Triples.WithSubjectPredicate(rsetID, resultVariable).ToList();
if (temp.Count > 0)
{
foreach (Triple t in temp)
{
if (t.Object.NodeType == NodeType.Literal)
{
if (!context.Handler.HandleVariable(((ILiteralNode)t.Object).Value)) ParserHelper.Stop();
context.Variables.Add(((ILiteralNode)t.Object).Value);
}
else
{
throw new RdfParseException("Result Set has a result variable definition which is not a Literal Node");
}
}
}
else
{
throw new RdfParseException("Result Set does not define any result variables or a boolean result");
}
//Then we're expecting some Solutions
temp = context.Graph.Triples.WithSubjectPredicate(rsetID, solution).ToList();
foreach (Triple slnTriple in temp)
{
//Each Solution has some Bindings
INode slnID = slnTriple.Object;
bool ok = false;
SparqlResult r = new SparqlResult();
foreach (Triple bindingTriple in context.Graph.Triples.WithSubjectPredicate(slnID, binding))
{
//Each Binding has a Variable and a Value
ok = true;
INode bindingID = bindingTriple.Object;
String var = String.Empty;
INode val = null;
//Retrieve the Variable and the Bound Value
foreach (Triple valueTriple in context.Graph.Triples.WithSubject(bindingID))
{
if (valueTriple.Predicate.Equals(variable))
{
if (!var.Equals(String.Empty)) throw new RdfParseException("Result Set contains a Binding which refers to more than one Variable");
if (valueTriple.Object.NodeType != NodeType.Literal) throw new RdfParseException("Result Set contains a Binding which refers to a Variable but not by a Literal Node as required");
var = ((ILiteralNode)valueTriple.Object).Value;
}
else if (valueTriple.Predicate.Equals(value))
{
if (val != null) throw new RdfParseException("Result Set contains a Binding which has more than one Value");
val = valueTriple.Object;
}
}
if (var.Equals(String.Empty) || val == null) throw new RdfParseException("Result Set contains a Binding which doesn't contain both a Variable and a Value");
//Check that the Variable was defined in the Header
if (!context.Variables.Contains(var))
{
throw new RdfParseException("Unable to Parse a SPARQL Result Set since a <binding> element attempts to bind a value to the variable '" + var + "' which is not defined in the <head> by a <variable> element!");
}
r.SetValue(var, val);
}
if (!ok) throw new RdfParseException("Result Set contains a Solution which has no Bindings");
//Check that all Variables are bound for a given result binding nulls where appropriate
foreach (String v in context.Variables)
{
if (!r.HasValue(v))
{
r.SetValue(v, null);
}
}
if (!context.Handler.HandleResult(r)) ParserHelper.Stop();
}
}
}
else
{
throw new RdfParseException("No Result Set object is defined in the Graph");
}
context.Handler.EndResults(true);
}
catch (RdfParsingTerminatedException)
{
context.Handler.EndResults(true);
}
catch
{
context.Handler.EndResults(false);
throw;
}
}
/// <summary>
/// Handles a Result by adding it to the Multiset
/// </summary>
/// <param name="result">Result</param>
/// <returns></returns>
protected override bool HandleResultInternal(SparqlResult result)
{
this._mset.Add(new Set(result));
return true;
}
/// <summary>
/// Formats a SPARQL Result using this Formatter to format the Node values for each Variable
/// </summary>
/// <param name="result">SPARQL Result</param>
/// <returns></returns>
public override String Format(SparqlResult result)
{
return result.ToString(this);
}
/// <summary>
/// Executes a SPARQL Query on the native Quad Store
/// </summary>
/// <param name="sparqlQuery">SPARQL Query to execute</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// This method will first attempt to parse the query into a <see cref="SparqlQuery">SparqlQuery</see> object. If this succeeds then the Query Type can be used to determine how to handle the response.
/// </para>
/// <para>
/// If the parsing fails then the query will be executed anyway using Virtuoso's SPASQL (SPARQL + SQL) syntax. Parsing can fail because Virtuoso supports various SPARQL extensions which the library does not support. These include things like aggregate functions but also SPARQL Update statements.
/// </para>
/// <para>
/// If you use an aggregate query which has an Integer, Decimal or Double type result then you will receive a <see cref="SparqlResultSet">SparqlResultSet</see> containing a single <see cref="SparqlResult">SparqlResult</see> which has contains a binding for a variable named <strong>Result</strong> which contains a <see cref="LiteralNode">LiteralNode</see> typed to the appropriate datatype.
/// </para>
/// </remarks>
/// <exception cref="RdfQueryException">Thrown if an error occurs in making the query</exception>
public Object Query(String sparqlQuery)
{
Object finalResult = null;
DataTable results = new DataTable();
results.Columns.CollectionChanged += new System.ComponentModel.CollectionChangeEventHandler(Columns_CollectionChanged);
//See if the query can be parsed into a SparqlQuery object
//It might not since the user might use Virtuoso's extensions to Sparql in their query
try
{
//We'll set the Parser to SPARQL 1.1 mode even though Virtuoso's SPARQL implementation has
//various perculiarties in their SPARQL 1.1 implementation and we'll try and
//handle the potential results in the catch branch if a valid SPARQL 1.0 query
//cannot be parsed
//Change made in response to a bug report by Aleksandr A. Zaripov [[email protected]]
SparqlQueryParser parser = new SparqlQueryParser();
parser.SyntaxMode = SparqlQuerySyntax.Sparql_1_1;
SparqlQuery query = parser.ParseFromString(sparqlQuery);
switch (query.QueryType)
{
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
//Type the Tables columns as System.Object
foreach (SparqlVariable var in query.Variables)
{
if (var.IsResultVariable)
{
results.Columns.Add(var.Name, typeof(System.Object));
}
}
break;
}
try
{
this.Open(false);
//Make the Query against Virtuoso
VirtuosoCommand cmd = this._db.CreateCommand();
cmd.CommandText = "SPARQL " + sparqlQuery;
VirtuosoDataAdapter adapter = new VirtuosoDataAdapter(cmd);
adapter.Fill(results);
//Decide how to process the results based on the return type
switch (query.QueryType)
{
case SparqlQueryType.Ask:
//Expect a DataTable containing a single row and column which contains a boolean
if (results.Rows.Count == 1 && results.Columns.Count == 1)
{
bool result;
int r;
if (Boolean.TryParse(results.Rows[0][0].ToString(), out result))
{
finalResult = new SparqlResultSet(result);
}
else if (Int32.TryParse(results.Rows[0][0].ToString(), out r))
{
if (r == 1)
{
finalResult = new SparqlResultSet(true);
}
else
{
finalResult = new SparqlResultSet(false);
}
}
else
{
throw new RdfQueryException("Expected a Boolean as the result of an ASK query but the non-boolean value '" + results.Rows[0][0].ToString() + "' was received");
}
}
else
{
//If we get anything else then we'll return that the result was False
finalResult = new SparqlResultSet(false);
}
break;
case SparqlQueryType.Construct:
case SparqlQueryType.Describe:
case SparqlQueryType.DescribeAll:
//Expect a DataTable containing a single row and column which contains a String
//That string will be a Turtle serialization of the Graph
if (results.Rows.Count == 1 && results.Columns.Count == 1)
{
try
{
//Use StringParser to parse
String data = results.Rows[0][0].ToString();
TurtleParser ttlparser = new TurtleParser();
Graph g = new Graph();
StringParser.Parse(g, data, ttlparser);
finalResult = g;
}
catch (RdfParseException parseEx)
{
throw new RdfQueryException("Expected a valid Turtle serialization of the Graph resulting from a CONSTRUCT/DESCRIBE query but the result failed to parse", parseEx);
}
}
else
{
throw new RdfQueryException("Expected a single string value representing the serialization of the Graph resulting from a CONSTRUCT/DESCRIBE query but this was not received");
}
break;
case SparqlQueryType.Select:
case SparqlQueryType.SelectAll:
case SparqlQueryType.SelectAllDistinct:
case SparqlQueryType.SelectAllReduced:
case SparqlQueryType.SelectDistinct:
case SparqlQueryType.SelectReduced:
//Expect a DataTable containing columns for each Result Variable and a row for each solution
SparqlResultSet rset = new SparqlResultSet();
rset.SetResult(true);
//Get Result Variables
List<SparqlVariable> resultVars = query.Variables.Where(v => v.IsResultVariable).ToList();
foreach (SparqlVariable var in resultVars)
{
rset.AddVariable(var.Name);
}
Graph temp = new Graph();
//Convert each solution into a SPARQLResult
foreach (DataRow r in results.Rows)
{
SparqlResult result = new SparqlResult();
foreach (SparqlVariable var in resultVars)
{
if (r[var.Name] != null)
{
result.SetValue(var.Name, this.LoadNode(temp, r[var.Name]));
}
}
rset.AddResult(result);
}
finalResult = rset;
break;
default:
throw new RdfQueryException("Unable to process the Results of an Unknown query type");
}
this.Close(false);
}
catch
{
this.Close(true, true);
throw;
}
}
catch (RdfParseException)
{
//Unable to parse a SPARQL 1.0 query
//Have to attempt to detect the return type based on the DataTable that
//the SPASQL (Sparql+SQL) query gives back
//Make the Query against Virtuoso
VirtuosoCommand cmd = this._db.CreateCommand();
cmd.CommandText = "SPARQL " /*define output:format '_JAVA_' "*/ + sparqlQuery;
VirtuosoDataAdapter adapter = new VirtuosoDataAdapter(cmd);
adapter.Fill(results);
//Try to detect the return type based on the DataTable configuration
if (results.Rows.Count == 0 && results.Columns.Count > 0)
{
//No Rows but some columns implies empty SELECT results
SparqlResultSet rset = new SparqlResultSet();
foreach (DataColumn col in results.Columns)
{
rset.AddVariable(col.ColumnName);
}
finalResult = rset;
}
else if (results.Rows.Count == 1 && results.Columns.Count == 1 && !Regex.IsMatch(sparqlQuery, "SELECT", RegexOptions.IgnoreCase))
{
//Added a fix here suggested by Alexander Sidorov - not entirely happy with this fix as what happens if SELECT just happens to occur in a URI/Variable Name?
//Single Row and Column implies ASK/DESCRIBE/CONSTRUCT results
bool result;
int r;
decimal rdec;
double rdbl;
float rflt;
if (results.Rows[0][0].ToString().Equals(String.Empty))
{
//Empty Results
finalResult = new SparqlResultSet();
}
else if (Boolean.TryParse(results.Rows[0][0].ToString(), out result))
{
//Parseable Boolean so ASK Results
finalResult = new SparqlResultSet(result);
}
else if (Int32.TryParse(results.Rows[0][0].ToString(), out r))
{
//Parseable Integer so Aggregate SELECT Query Results
SparqlResultSet rset = new SparqlResultSet();
rset.AddVariable("Result");
SparqlResult res = new SparqlResult();
res.SetValue("Result", new LiteralNode(null, r.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeInteger)));
rset.AddResult(res);
finalResult = rset;
}
else if (Single.TryParse(results.Rows[0][0].ToString(), out rflt))
{
//Parseable Single so Aggregate SELECT Query Results
SparqlResultSet rset = new SparqlResultSet();
rset.AddVariable("Result");
SparqlResult res = new SparqlResult();
res.SetValue("Result", new LiteralNode(null, rflt.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeFloat)));
rset.AddResult(res);
finalResult = rset;
}
else if (Double.TryParse(results.Rows[0][0].ToString(), out rdbl))
{
//Parseable Double so Aggregate SELECT Query Results
SparqlResultSet rset = new SparqlResultSet();
rset.AddVariable("Result");
SparqlResult res = new SparqlResult();
res.SetValue("Result", new LiteralNode(null, rdbl.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeDouble)));
rset.AddResult(res);
finalResult = rset;
}
else if (Decimal.TryParse(results.Rows[0][0].ToString(), out rdec))
{
//Parseable Decimal so Aggregate SELECT Query Results
SparqlResultSet rset = new SparqlResultSet();
rset.AddVariable("Result");
SparqlResult res = new SparqlResult();
res.SetValue("Result", new LiteralNode(null, rdec.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeDecimal)));
rset.AddResult(res);
finalResult = rset;
}
else
{
//String so try and parse as Turtle
try
{
//Use StringParser to parse
String data = results.Rows[0][0].ToString();
TurtleParser ttlparser = new TurtleParser();
Graph g = new Graph();
StringParser.Parse(g, data, ttlparser);
finalResult = g;
}
catch (RdfParseException)
{
//If it failed to parse then it might be the result of one of the aggregate
//functions that Virtuoso extends Sparql with
Graph temp = new Graph();
SparqlResultSet rset = new SparqlResultSet();
rset.AddVariable(results.Columns[0].ColumnName);
SparqlResult res = new SparqlResult();
res.SetValue(results.Columns[0].ColumnName, this.LoadNode(temp, results.Rows[0][0]));
//Nothing was returned here previously - fix submitted by Aleksandr A. Zaripov [[email protected]]
rset.AddResult(res);
finalResult = rset;
}
}
}
else
{
//Any other number of rows/columns we have to assume that it's normal SELECT results
//Changed in response to bug report by Aleksandr A. Zaripov [[email protected]]
//SELECT Query Results
SparqlResultSet rset = new SparqlResultSet();
rset.SetResult(true);
//Get Result Variables
foreach (DataColumn col in results.Columns)
{
rset.AddVariable(col.ColumnName);
}
Graph temp = new Graph();
//Convert each solution into a SPARQLResult
foreach (DataRow r in results.Rows)
{
SparqlResult result = new SparqlResult();
foreach (String var in rset.Variables)
{
if (r[var] != null)
{
result.SetValue(var, this.LoadNode(temp, r[var]));
}
}
rset.AddResult(result);
}
finalResult = rset;
}
}
return finalResult;
}
/// <summary>
/// Writes a Result to the output
/// </summary>
/// <param name="result">SPARQL Result</param>
/// <returns></returns>
protected override bool HandleResultInternal(SparqlResult result)
{
if (this._currentType == SparqlResultsType.Boolean) throw new RdfParseException("Cannot handle a Result when the handler has already handled a boolean result");
this._currentType = SparqlResultsType.VariableBindings;
if (!this._headerWritten && this._formatter is IResultSetFormatter)
{
this._writer.WriteLine(((IResultSetFormatter)this._formatter).FormatResultSetHeader(this._currVariables.Distinct()));
this._headerWritten = true;
}
this._writer.WriteLine(this._formatter.Format(result));
return true;
}
private static List<string> valuesOfResults(SparqlResult sq)
{
List<string> variableName = new List<string>();
variableName = sq.Variables.ToList();
List<string> output = new List<string>();
foreach (string var in variableName)
{
output.Add(sq.Value(var).ToString());
}
return output;
}
private static int scorecalc(string keyword ,SparqlResult singleuri)
{
int score_redirect=0;
int score_resource = 0;
score_resource= computeLevenshteinDistance(keyword, singleuri.Value("literal").ToString());
if (singleuri.Value("redirects") != null)
{
string disamb_query = "select * where{ <" + singleuri.Value("redirects").ToString() + "><http://www.w3.org/2000/01/rdf-schema#label> ?redirect_label}";
SparqlResultSet result = remoteEndPoint.QueryWithResultSet(disamb_query);
if (result.Count != 0)
{
score_redirect = computeLevenshteinDistance(keyword, result[0].Value("redirect_label").ToString());
return( score_redirect<score_resource? score_redirect: score_resource);
}
else
{
return score_resource;
}
}
return score_resource;
}
/// <summary>
/// we get the values of each result from here
/// </summary>
/// <param name="sq">input sparqlResult</param>
/// <returns>list of string of all the urls according to the query structure ex:?pf ?middle ?os ?ps </returns>
private static List<string> valuesOfResults(SparqlResult sq)
{
//I need this one to know the variables names
variableName = new List<string>();
//List<string> variableName = new List<string>();
variableName = sq.Variables.ToList();
List<string> output = new List<string>();
foreach (string var in variableName)
{
output.Add(sq.Value(var).ToString());
}
return output;
}
/// <summary>
/// Handles a SPARQL Result by incrementing the counter
/// </summary>
/// <param name="result">Result</param>
/// <returns></returns>
protected override bool HandleResultInternal(SparqlResult result)
{
this._counter++;
return true;
}
private void TryParseResultRow(TokenisingResultParserContext context)
{
IToken next = context.Tokens.Peek();
if (next.TokenType == Token.EOF)
{
context.Tokens.Dequeue();
return;
}
bool allowEOL = true, expectComma = false;
int v = 0;
SparqlResult result = new SparqlResult();
while (true)
{
next = context.Tokens.Dequeue();
switch (next.TokenType)
{
case Token.BLANKNODEWITHID:
if (expectComma) throw ParserHelper.Error("Unexpected Blank Node, expected a comma between RDF Terms", next);
if (v >= context.Variables.Count) throw ParserHelper.Error("Too many RDF Terms, only expecting " + context.Variables.Count + " terms", next);
INode blank = context.Handler.CreateBlankNode(next.Value.Substring(2));
result.SetValue(context.Variables[v], blank);
v++;
allowEOL = true;
expectComma = true;
break;
case Token.LITERAL:
case Token.PLAINLITERAL:
if (expectComma) throw ParserHelper.Error("Unexpected Blank Node, expected a comma between RDF Terms", next);
if (v >= context.Variables.Count) throw ParserHelper.Error("Too many RDF Terms, only expecting " + context.Variables.Count + " terms", next);
//Try and guess what kind of term this is
String lexicalForm = next.Value;
INode value;
if (lexicalForm.StartsWith("http://") || lexicalForm.StartsWith("https://") || lexicalForm.StartsWith("mailto:") || lexicalForm.StartsWith("ftp://"))
{
try
{
//Guessing a URI if starts with common URI prefix
value = context.Handler.CreateUriNode(UriFactory.Create(lexicalForm));
}
catch
{
//If invalid URI fall back to treating as literal
value = context.Handler.CreateLiteralNode(lexicalForm);
}
}
else
{
value = context.Handler.CreateLiteralNode(lexicalForm);
}
result.SetValue(context.Variables[v], value);
v++;
allowEOL = true;
expectComma = true;
break;
case Token.EOL:
if (allowEOL)
{
break;
}
else
{
if (v == context.Variables.Count - 1)
{
//If this is the last expected term then this must be an empty term
v++;
break;
}
throw ParserHelper.Error("Unexpected End of Line, expected a RDF Term Token", next);
}
case Token.COMMA:
if (!expectComma)
{
//This is an empty field
if (v >= context.Variables.Count) throw ParserHelper.Error("Too many RDF Terms, only expecting " + context.Variables.Count + " terms", next);
v++;
}
expectComma = false;
allowEOL = false;
break;
case Token.EOF:
if (!allowEOL) throw ParserHelper.Error("Unexpected EOF, expected another RDF Term for the Result Row", next);
break;
default:
throw ParserHelper.Error("Unexpected Token '" + next.GetType().ToString() + "' encountered", next);
}
//Stop when we've hit the End of the Line/File
if (next.TokenType == Token.EOL || next.TokenType == Token.EOF) break;
}
if (!context.Handler.HandleResult(result)) ParserHelper.Stop();
}
protected abstract void ProcessResult(SparqlResult result);
