private IEnumerable <Triple> GetTriplesForDataObject(string identity)
{
var queryContext = new SparqlQueryContext(string.Format(QueryTemplate, identity));
queryContext.SparqlResultsFormat = SparqlResultsFormat.Xml;
queryContext.GraphResultsFormat = RdfFormat.NTriples;
var results = Client.ExecuteQuery(queryContext, DataSetGraphUris);
foreach (var row in results.ResultSet)
{
// create new triple
var triple = new Triple
{
Subject = identity,
Graph = row["g"].ToString(),
Predicate = row["p"].ToString()
};
var literal = row["o"] as ILiteralNode;
if (literal != null)
{
var dt = literal.DataType?.ToString();
triple.LangCode = literal.Language;
triple.DataType = dt ?? RdfDatatypes.String;
triple.Object = literal.Value;
triple.IsLiteral = true;
}
else
{
triple.Object = row["o"].ToString().Trim();
}
yield return(triple);
}
}
private static string FormatDeletePattern(Triple p, ref int propId)
{
return(String.Format(" {0} {1} {2} .",
FormatDeletePatternItem(p.Subject, ref propId),
FormatDeletePatternItem(p.Predicate, ref propId),
p.IsLiteral
? FormatDeletePatternItem(p.Object, p.DataType, p.LangCode)
: FormatDeletePatternItem(p.Object, ref propId)));
}
private static Triple MakeTriple(INode subjectNode, INode predicateNode, INode objectNode)
{
var litNode = objectNode as ILiteralNode;
var t = new Triple
{
Subject = subjectNode.ToString(),
Predicate = predicateNode.ToString(),
IsLiteral = objectNode is ILiteralNode,
Object = litNode != null ? litNode.Value : objectNode.ToString()
};
if (litNode == null)
{
return(t);
}
t.DataType = litNode?.DataType?.ToString() ?? Constants.DefaultDatatypeUri;
t.LangCode = litNode?.Language;
return(t);
}
//private string FormatDeletePatterns(IEnumerable<Triple> deletePatterns)
//{
// int propId = 0;
// var deleteOp = new StringBuilder();
// deleteOp.AppendLine("DELETE {");
// foreach (var deleteGraphGroup in deletePatterns.GroupBy(d => d.Graph))
// {
// deleteOp.AppendFormat("GRAPH <{0}> {{", deleteGraphGroup.Key);
// deleteOp.AppendLine();
// foreach (var deletePattern in deleteGraphGroup)
// {
// if (deletePattern.Predicate.Equals(Constants.WildcardUri))
// {
// deleteOp.AppendFormat(" <{0}> ?d{1} ?d{2} .", deletePattern.Subject, propId++, propId++);
// }
// else if (!deletePattern.IsLiteral && deletePattern.Object.Equals(Constants.WildcardUri))
// {
// deleteOp.AppendFormat(" <{0}> <{1}> ?d{2} .", deletePattern.Subject, deletePattern.Predicate,
// propId++);
// }
// else
// {
// AppendTriplePattern(deletePattern, deleteOp);
// }
// deleteOp.AppendLine();
// }
// deleteOp.AppendLine("}");
// }
// deleteOp.AppendLine("}");
// return deleteOp.ToString();
//}
private void AppendTriplePattern(Triple triple, StringBuilder builder)
{
builder.AppendFormat(" <{0}> <{1}> ", triple.Subject, triple.Predicate);
if (triple.IsLiteral)
{
builder.AppendFormat("\"{0}\"", triple.Object);
if (triple.DataType != null)
{
builder.Append("^^");
builder.AppendFormat("<{0}>", triple.DataType);
}
if (triple.LangCode != null)
{
builder.Append("@");
builder.Append(triple.LangCode);
}
}
else
{
builder.AppendFormat("<{0}>", triple.Object);
}
builder.Append(" .");
}
//private string FormatDeletePatterns(IEnumerable<Triple> deletePatterns)
//{
// int propId = 0;
// var deleteOp = new StringBuilder();
// deleteOp.AppendLine("DELETE {");
// foreach (var deleteGraphGroup in deletePatterns.GroupBy(d => d.Graph))
// {
// deleteOp.AppendFormat("GRAPH <{0}> {{", deleteGraphGroup.Key);
// deleteOp.AppendLine();
// foreach (var deletePattern in deleteGraphGroup)
// {
// if (deletePattern.Predicate.Equals(Constants.WildcardUri))
// {
// deleteOp.AppendFormat(" <{0}> ?d{1} ?d{2} .", deletePattern.Subject, propId++, propId++);
// }
// else if (!deletePattern.IsLiteral && deletePattern.Object.Equals(Constants.WildcardUri))
// {
// deleteOp.AppendFormat(" <{0}> <{1}> ?d{2} .", deletePattern.Subject, deletePattern.Predicate,
// propId++);
// }
// else
// {
// AppendTriplePattern(deletePattern, deleteOp);
// }
// deleteOp.AppendLine();
// }
// deleteOp.AppendLine("}");
// }
// deleteOp.AppendLine("}");
// return deleteOp.ToString();
//}
private void AppendTriplePattern(Triple triple, StringBuilder builder)
{
builder.AppendFormat(" <{0}> <{1}> ", triple.Subject, triple.Predicate);
if (triple.IsLiteral)
{
builder.AppendFormat("\"{0}\"", triple.Object);
if (triple.DataType != null)
{
builder.Append("^^");
builder.AppendFormat("<{0}>", triple.DataType);
}
if (triple.LangCode != null)
{
builder.Append("@");
builder.Append(triple.LangCode);
}
}
else
{
builder.AppendFormat("<{0}>", triple.Object);
}
builder.Append(" .");
}
/// <summary>
/// Determines if the specified triple consists of a grounded (non-wildcard)
/// subject, predicate and object.
/// </summary>
/// <param name="t">The triple to check</param>
/// <returns></returns>
private static bool IsGrounded(Triple t)
{
return (t.Predicate != Constants.WildcardUri) && (t.Object != Constants.WildcardUri);
}
/// <summary>
/// Determines if the specified triple is targeted at a specific graph
/// </summary>
/// <param name="t">The triple to check</param>
/// <returns></returns>
private static bool IsGraphTargeted(Triple t)
{
return t.Graph != null && t.Graph != Constants.WildcardUri;
}
private static string FormatDeletePattern(Triple p, ref int propId)
{
return String.Format(" {0} {1} {2} .",
FormatDeletePatternItem(p.Subject, ref propId),
FormatDeletePatternItem(p.Predicate, ref propId),
p.IsLiteral
? FormatDeletePatternItem(p.Object, p.DataType, p.LangCode)
: FormatDeletePatternItem(p.Object, ref propId));
}
private IEnumerable<Triple> GetTriplesForDataObject(string identity)
{
var queryContext = new SparqlQueryContext(string.Format(QueryTemplate, identity));
queryContext.SparqlResultsFormat = SparqlResultsFormat.Xml;
queryContext.GraphResultsFormat = RdfFormat.NTriples;
var results = Client.ExecuteQuery(queryContext, DataSetGraphUris);
foreach(var row in results.ResultSet)
{
// create new triple
var triple = new Triple
{
Subject = identity,
Graph = row["g"].ToString(),
Predicate = row["p"].ToString()
};
var literal = row["o"] as ILiteralNode;
if (literal != null)
{
var dt = literal.DataType?.ToString();
triple.LangCode = literal.Language;
triple.DataType = dt ?? RdfDatatypes.String;
triple.Object = literal.Value;
triple.IsLiteral = true;
}
else
{
triple.Object = row["o"].ToString().Trim();
}
yield return triple;
}
}
/// <summary>
/// Determines if the specified triple consists of a grounded (non-wildcard)
/// subject, predicate and object.
/// </summary>
/// <param name="t">The triple to check</param>
/// <returns></returns>
private static bool IsGrounded(Triple t)
{
return((t.Predicate != Constants.WildcardUri) && (t.Object != Constants.WildcardUri));
}
/// <summary>
/// Determines if the specified triple is targeted at a specific graph
/// </summary>
/// <param name="t">The triple to check</param>
/// <returns></returns>
private static bool IsGraphTargeted(Triple t)
{
return(t.Graph != null && t.Graph != Constants.WildcardUri);
}
private static string FormatDeletePattern(Triple p, ref int propId)
{
return(p.Predicate.Equals(Constants.WildcardUri)
? String.Format(" <{0}> ?d{1} ?d{2} .", p.Subject, propId++, propId++)
: String.Format(" <{0}> <{1}> ?d{2} .", p.Subject, p.Predicate, propId++));
}
public IEnumerable<IDataObject> BindDataObjects(XmlReader xmlReader, bool resultsAreOrdered = false)
{
var variables = new List<string>();
var xmlResultNodeTripleValues = new List<string>();
bool readingResults = false;
var resourceTriples = new Dictionary<string, List<Triple>>();
string lastLoadedSubject = null; //if resultsAreOrdered then once we get a new subject we can create the DataObject
while (xmlReader.Read())
{
if (xmlReader.NamespaceURI.Equals("http://www.w3.org/2005/sparql-results#")
&& xmlReader.NodeType == XmlNodeType.Element)
{
var nodeName = xmlReader.Name.ToLower();
if (!readingResults) //header part
{
if (nodeName.Equals("variable"))
{
variables.Add(xmlReader.GetAttribute("name"));
continue;
}
else if (nodeName.Equals("results"))
{
readingResults = true;
if (variables.Count != 1 && variables.Count != 3)
{
throw new NotSupportedException("Sparql results can be a list of id's(1 variable) or a list of triples(3 variables). Variables found:" + variables.Count);
}
continue;
}
}
else //reading results
{
if (variables.Count == 1) //load id's
{
if (nodeName.Equals("uri"))
{
string uri = null;
try
{
uri = xmlReader.ReadElementContentAsString();
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ClientDataBindError,
"Error binding to SPARQL results element. {0}", ex);
}
if (!String.IsNullOrEmpty(uri))
{
yield return _storeContext.MakeDataObject(uri);
}
}
}
else //load triples
{
var isUri = nodeName.Equals("uri");
var isLiteral = nodeName.Equals("literal");
string literalDataType = null;
string literalLanguage = null;
if (isUri || isLiteral)
{
string elementContentAsString = null;
try
{
literalDataType = xmlReader.GetAttribute("datatype");
literalLanguage = xmlReader.GetAttribute("xml:lang");
elementContentAsString = xmlReader.ReadElementContentAsString();
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ClientDataBindError,
"Error binding to SPARQL results element. {0}", ex);
}
if (!String.IsNullOrEmpty(elementContentAsString))
{
xmlResultNodeTripleValues.Add(elementContentAsString);
}
}
//create new triple
if (xmlResultNodeTripleValues.Count == 3)
{
var s = xmlResultNodeTripleValues[0];
//if object was a literal it's the last read value => datatype, lang must match
var triple = new Triple
{
Subject = s,
Predicate = xmlResultNodeTripleValues[1],
IsLiteral = isLiteral,
Object = xmlResultNodeTripleValues[2],
LangCode = literalLanguage,
DataType = literalDataType ?? RdfDatatypes.String
};
if (resourceTriples.ContainsKey(s)) //resource already has triples
{
resourceTriples[s].Add(triple);
}
else
{
resourceTriples.Add(s, new List<Triple> { triple });
}
//if results are in order and we have new subject then we can create a new object for the previous one
if (resultsAreOrdered && lastLoadedSubject != null && lastLoadedSubject != s)
{
var dataObject = _storeContext.MakeDataObject(lastLoadedSubject) as DataObject;
dataObject.BindTriples(resourceTriples[lastLoadedSubject]);
yield return dataObject;
}
lastLoadedSubject = s;
xmlResultNodeTripleValues.Clear();
}
}
}
}
}
xmlReader.Close();
if (resultsAreOrdered && lastLoadedSubject != null)
{
var dataObject = _storeContext.MakeDataObject(lastLoadedSubject) as DataObject;
dataObject.BindTriples(resourceTriples[lastLoadedSubject]);
yield return dataObject;
}
else
{
foreach (KeyValuePair<string, List<Triple>> resourceTriple in resourceTriples)
{
var dataObject = _storeContext.MakeDataObject(resourceTriple.Key) as DataObject;
dataObject.BindTriples(resourceTriple.Value);
yield return dataObject;
}
}
}
private static string FormatDeletePattern(Triple p, ref int propId)
{
return p.Predicate.Equals(Constants.WildcardUri)
? String.Format(" <{0}> ?d{1} ?d{2} .", p.Subject, propId++, propId++)
: String.Format(" <{0}> <{1}> ?d{2} .", p.Subject, p.Predicate, propId++);
}
public IEnumerable <IDataObject> BindDataObjects(XmlReader xmlReader, bool resultsAreOrdered = false)
{
var variables = new List <string>();
var xmlResultNodeTripleValues = new List <string>();
bool readingResults = false;
var resourceTriples = new Dictionary <string, List <Triple> >();
string lastLoadedSubject = null; //if resultsAreOrdered then once we get a new subject we can create the DataObject
while (xmlReader.Read())
{
if (xmlReader.NamespaceURI.Equals("http://www.w3.org/2005/sparql-results#") &&
xmlReader.NodeType == XmlNodeType.Element)
{
var nodeName = xmlReader.Name.ToLower();
if (!readingResults) //header part
{
if (nodeName.Equals("variable"))
{
variables.Add(xmlReader.GetAttribute("name"));
continue;
}
else if (nodeName.Equals("results"))
{
readingResults = true;
if (variables.Count != 1 && variables.Count != 3)
{
throw new NotSupportedException("Sparql results can be a list of id's(1 variable) or a list of triples(3 variables). Variables found:" + variables.Count);
}
continue;
}
}
else //reading results
{
if (variables.Count == 1) //load id's
{
if (nodeName.Equals("uri"))
{
string uri = null;
try
{
uri = xmlReader.ReadElementContentAsString();
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ClientDataBindError,
"Error binding to SPARQL results element. {0}", ex);
}
if (!String.IsNullOrEmpty(uri))
{
yield return(_storeContext.MakeDataObject(uri));
}
}
}
else //load triples
{
var isUri = nodeName.Equals("uri");
var isLiteral = nodeName.Equals("literal");
string literalDataType = null;
string literalLanguage = null;
if (isUri || isLiteral)
{
string elementContentAsString = null;
try
{
literalDataType = xmlReader.GetAttribute("datatype");
literalLanguage = xmlReader.GetAttribute("xml:lang");
elementContentAsString = xmlReader.ReadElementContentAsString();
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ClientDataBindError,
"Error binding to SPARQL results element. {0}", ex);
}
if (!String.IsNullOrEmpty(elementContentAsString))
{
xmlResultNodeTripleValues.Add(elementContentAsString);
}
}
//create new triple
if (xmlResultNodeTripleValues.Count == 3)
{
var s = xmlResultNodeTripleValues[0];
//if object was a literal it's the last read value => datatype, lang must match
var triple = new Triple
{
Subject = s,
Predicate = xmlResultNodeTripleValues[1],
IsLiteral = isLiteral,
Object = xmlResultNodeTripleValues[2],
LangCode = literalLanguage,
DataType = literalDataType ?? RdfDatatypes.String
};
if (resourceTriples.ContainsKey(s)) //resource already has triples
{
resourceTriples[s].Add(triple);
}
else
{
resourceTriples.Add(s, new List <Triple> {
triple
});
}
//if results are in order and we have new subject then we can create a new object for the previous one
if (resultsAreOrdered && lastLoadedSubject != null && lastLoadedSubject != s)
{
var dataObject = _storeContext.MakeDataObject(lastLoadedSubject) as DataObject;
dataObject.BindTriples(resourceTriples[lastLoadedSubject]);
yield return(dataObject);
}
lastLoadedSubject = s;
xmlResultNodeTripleValues.Clear();
}
}
}
}
}
xmlReader.Close();
if (resultsAreOrdered && lastLoadedSubject != null)
{
var dataObject = _storeContext.MakeDataObject(lastLoadedSubject) as DataObject;
dataObject.BindTriples(resourceTriples[lastLoadedSubject]);
yield return(dataObject);
}
else
{
foreach (KeyValuePair <string, List <Triple> > resourceTriple in resourceTriples)
{
var dataObject = _storeContext.MakeDataObject(resourceTriple.Key) as DataObject;
dataObject.BindTriples(resourceTriple.Value);
yield return(dataObject);
}
}
}
private static Triple MakeTriple(INode subjectNode, INode predicateNode, INode objectNode)
{
var litNode = objectNode as ILiteralNode;
var t = new Triple
{
Subject = subjectNode.ToString(),
Predicate = predicateNode.ToString(),
IsLiteral = objectNode is ILiteralNode,
Object = litNode != null ? litNode.Value : objectNode.ToString()
};
if (litNode == null) return t;
t.DataType = litNode?.DataType?.ToString() ?? Constants.DefaultDatatypeUri;
t.LangCode = litNode?.Language;
return t;
}
