/// <summary>
/// Creates a new NTriples formatter.
/// </summary>
/// <param name="syntax">NTriples syntax to output.</param>
/// <param name="formatName">Format Name.</param>
public NTriplesFormatter(NTriplesSyntax syntax, string formatName)
: base(formatName)
{
Syntax = syntax;
switch (Syntax)
{
case NTriplesSyntax.Original:
_bnodeMapper = new BlankNodeOutputMapper(WriterHelper.IsValidStrictBlankNodeID);
break;
default:
_bnodeMapper = new BlankNodeOutputMapper(WriterHelper.IsValidBlankNodeID);
break;
}
}
/// <summary>
/// Internal method which generates the NTriples in Json Output for a Graph
/// </summary>
/// <param name="g">Graph to save</param>
/// <param name="output">Stream to save to</param>
private void GenerateOutput(IGraph g, TextWriter output)
{
//Get a Blank Node Output Mapper
BlankNodeOutputMapper bnodeMapper = new BlankNodeOutputMapper(WriterHelper.IsValidBlankNodeID);
//Get the Writer and Configure Options
JsonTextWriter writer = new JsonTextWriter(output);
if (this._prettyprint)
{
writer.Formatting = Newtonsoft.Json.Formatting.Indented;
}
else
{
writer.Formatting = Newtonsoft.Json.Formatting.None;
}
//Start the overall Array which contains the set of Triple Objects
writer.WriteStartArray();
//Start writing Triples
foreach (Triple t in g.Triples)
{
writer.WriteStartObject();
//Write Subject
writer.WritePropertyName("subject");
writer.WriteValue(this._formatter.Format(t.Subject));
//Write Predicate
writer.WritePropertyName("predicate");
writer.WriteValue(this._formatter.Format(t.Predicate));
//Write Object
writer.WritePropertyName("object");
writer.WriteValue(this._formatter.Format(t.Object));
writer.WriteEndObject();
}
//Terminate the Array which represents the Graph
writer.WriteEndArray();
}
/// <summary>
/// Internal method which generates the NTriples in Json Output for a Graph
/// </summary>
/// <param name="g">Graph to save</param>
/// <param name="output">Stream to save to</param>
private void GenerateOutput(IGraph g, TextWriter output)
{
//Get a Blank Node Output Mapper
BlankNodeOutputMapper bnodeMapper = new BlankNodeOutputMapper(WriterHelper.IsValidBlankNodeID);
//Get the Writer and Configure Options
JsonTextWriter writer = new JsonTextWriter(output);
if (this._prettyprint)
{
writer.Formatting = Newtonsoft.Json.Formatting.Indented;
}
else
{
writer.Formatting = Newtonsoft.Json.Formatting.None;
}
//Start the overall Array which contains the set of Triple Objects
writer.WriteStartArray();
//Start writing Triples
foreach (Triple t in g.Triples)
{
writer.WriteStartObject();
//Write Subject
writer.WritePropertyName("subject");
writer.WriteValue(this._formatter.Format(t.Subject));
//Write Predicate
writer.WritePropertyName("predicate");
writer.WriteValue(this._formatter.Format(t.Predicate));
//Write Object
writer.WritePropertyName("object");
writer.WriteValue(this._formatter.Format(t.Object));
writer.WriteEndObject();
}
//Terminate the Array which represents the Graph
writer.WriteEndArray();
}
/// <summary>
/// Internal method which generates the RDF/Json Output for a Graph.
/// </summary>
/// <param name="g">Graph to save.</param>
/// <param name="output">Stream to save to.</param>
private void GenerateOutput(IGraph g, TextWriter output)
{
// Get a Blank Node Output Mapper
BlankNodeOutputMapper bnodeMapper = new BlankNodeOutputMapper(WriterHelper.IsValidBlankNodeID);
// Get the Writer and Configure Options
JsonTextWriter writer = new JsonTextWriter(output);
if (_prettyprint)
{
writer.Formatting = Newtonsoft.Json.Formatting.Indented;
}
else
{
writer.Formatting = Newtonsoft.Json.Formatting.None;
}
// Start the overall Object which represents the Graph
writer.WriteStartObject();
// Get the Triples as a Sorted List
List <Triple> ts = g.Triples.ToList();
ts.Sort(new FullTripleComparer(new FastNodeComparer()));
// Variables we need to track our writing
INode lastSubj, lastPred;
lastSubj = lastPred = null;
for (int i = 0; i < ts.Count; i++)
{
Triple t = ts[i];
if (lastSubj == null || !t.Subject.Equals(lastSubj))
{
// Terminate previous Triples
if (lastSubj != null)
{
writer.WriteEndArray();
writer.WriteEndObject();
}
// Start a new set of Triples
// Validate Subject
switch (t.Subject.NodeType)
{
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Literal:
throw new RdfOutputException(WriterErrorMessages.LiteralSubjectsUnserializable("RDF/JSON"));
case NodeType.Blank:
break;
case NodeType.Uri:
// OK
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
// Write out the Subject
if (t.Subject.NodeType != NodeType.Blank)
{
writer.WritePropertyName(t.Subject.ToString());
}
else
{
// Remap Blank Node IDs as appropriate
writer.WritePropertyName("_:" + bnodeMapper.GetOutputID(((IBlankNode)t.Subject).InternalID));
}
// Start an Object for the Subject
writer.WriteStartObject();
lastSubj = t.Subject;
// Write the first Predicate
// Validate Predicate
switch (t.Predicate.NodeType)
{
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Blank:
throw new RdfOutputException(WriterErrorMessages.BlankPredicatesUnserializable("RDF/JSON"));
case NodeType.Literal:
throw new RdfOutputException(WriterErrorMessages.LiteralPredicatesUnserializable("RDF/JSON"));
case NodeType.Uri:
// OK
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
// Write the Predicate
writer.WritePropertyName(t.Predicate.ToString());
// Create an Array for the Objects
writer.WriteStartArray();
lastPred = t.Predicate;
}
else if (lastPred == null || !t.Predicate.Equals(lastPred))
{
// Terminate previous Predicate Object list
writer.WriteEndArray();
// Write the next Predicate
// Validate Predicate
switch (t.Predicate.NodeType)
{
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Blank:
throw new RdfOutputException(WriterErrorMessages.BlankPredicatesUnserializable("RDF/JSON"));
case NodeType.Literal:
throw new RdfOutputException(WriterErrorMessages.LiteralPredicatesUnserializable("RDF/JSON"));
case NodeType.Uri:
// OK
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
// Write the Predicate
writer.WritePropertyName(t.Predicate.ToString());
// Create an Array for the Objects
writer.WriteStartArray();
lastPred = t.Predicate;
}
// Write the Object
// Create an Object for the Object
INode obj = t.Object;
writer.WriteStartObject();
writer.WritePropertyName("value");
switch (obj.NodeType)
{
case NodeType.Blank:
// Remap Blank Node IDs as appropriate
writer.WriteValue("_:" + bnodeMapper.GetOutputID(((IBlankNode)obj).InternalID));
writer.WritePropertyName("type");
writer.WriteValue("bnode");
break;
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Literal:
ILiteralNode lit = (ILiteralNode)obj;
writer.WriteValue(lit.Value);
if (!lit.Language.Equals(String.Empty))
{
writer.WritePropertyName("lang");
writer.WriteValue(lit.Language);
}
else if (lit.DataType != null)
{
writer.WritePropertyName("datatype");
writer.WriteValue(lit.DataType.AbsoluteUri);
}
writer.WritePropertyName("type");
writer.WriteValue("literal");
break;
case NodeType.Uri:
writer.WriteValue(obj.ToString());
writer.WritePropertyName("type");
writer.WriteValue("uri");
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
writer.WriteEndObject();
}
// Terminate the Object which represents the Graph
writer.WriteEndObject();
}
/// <summary>
/// Internal method which generates the RDF/Json Output for a Graph
/// </summary>
/// <param name="g">Graph to save</param>
/// <param name="output">Stream to save to</param>
private void GenerateOutput(IGraph g, TextWriter output)
{
//Get a Blank Node Output Mapper
BlankNodeOutputMapper bnodeMapper = new BlankNodeOutputMapper(WriterHelper.IsValidBlankNodeID);
//Get the Writer and Configure Options
JsonTextWriter writer = new JsonTextWriter(output);
if (this._prettyprint)
{
writer.Formatting = Newtonsoft.Json.Formatting.Indented;
}
else
{
writer.Formatting = Newtonsoft.Json.Formatting.None;
}
//Start the overall Object which represents the Graph
writer.WriteStartObject();
//Get the Triples as a Sorted List
List<Triple> ts = g.Triples.ToList();
ts.Sort();
//Variables we need to track our writing
INode lastSubj, lastPred;
lastSubj = lastPred = null;
for (int i = 0; i < ts.Count; i++)
{
Triple t = ts[i];
if (lastSubj == null || !t.Subject.Equals(lastSubj))
{
//Terminate previous Triples
if (lastSubj != null)
{
writer.WriteEndArray();
writer.WriteEndObject();
}
//Start a new set of Triples
//Validate Subject
switch (t.Subject.NodeType)
{
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Literal:
throw new RdfOutputException(WriterErrorMessages.LiteralSubjectsUnserializable("RDF/JSON"));
case NodeType.Blank:
break;
case NodeType.Uri:
//OK
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
//Write out the Subject
if (t.Subject.NodeType != NodeType.Blank)
{
writer.WritePropertyName(t.Subject.ToString());
}
else
{
//Remap Blank Node IDs as appropriate
writer.WritePropertyName("_:" + bnodeMapper.GetOutputID(((IBlankNode)t.Subject).InternalID));
}
//Start an Object for the Subject
writer.WriteStartObject();
lastSubj = t.Subject;
//Write the first Predicate
//Validate Predicate
switch (t.Predicate.NodeType)
{
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Blank:
throw new RdfOutputException(WriterErrorMessages.BlankPredicatesUnserializable("RDF/JSON"));
case NodeType.Literal:
throw new RdfOutputException(WriterErrorMessages.LiteralPredicatesUnserializable("RDF/JSON"));
case NodeType.Uri:
//OK
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
//Write the Predicate
writer.WritePropertyName(t.Predicate.ToString());
//Create an Array for the Objects
writer.WriteStartArray();
lastPred = t.Predicate;
}
else if (lastPred == null || !t.Predicate.Equals(lastPred))
{
//Terminate previous Predicate Object list
writer.WriteEndArray();
//Write the next Predicate
//Validate Predicate
switch (t.Predicate.NodeType)
{
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Blank:
throw new RdfOutputException(WriterErrorMessages.BlankPredicatesUnserializable("RDF/JSON"));
case NodeType.Literal:
throw new RdfOutputException(WriterErrorMessages.LiteralPredicatesUnserializable("RDF/JSON"));
case NodeType.Uri:
//OK
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
//Write the Predicate
writer.WritePropertyName(t.Predicate.ToString());
//Create an Array for the Objects
writer.WriteStartArray();
lastPred = t.Predicate;
}
//Write the Object
//Create an Object for the Object
INode obj = t.Object;
writer.WriteStartObject();
writer.WritePropertyName("value");
switch (obj.NodeType)
{
case NodeType.Blank:
//Remap Blank Node IDs as appropriate
writer.WriteValue("_:" + bnodeMapper.GetOutputID(((IBlankNode)obj).InternalID));
writer.WritePropertyName("type");
writer.WriteValue("bnode");
break;
case NodeType.GraphLiteral:
throw new RdfOutputException(WriterErrorMessages.GraphLiteralsUnserializable("RDF/JSON"));
case NodeType.Literal:
ILiteralNode lit = (ILiteralNode)obj;
writer.WriteValue(lit.Value);
if (!lit.Language.Equals(String.Empty))
{
writer.WritePropertyName("lang");
writer.WriteValue(lit.Language);
}
else if (lit.DataType != null)
{
writer.WritePropertyName("datatype");
writer.WriteValue(lit.DataType.ToString());
}
writer.WritePropertyName("type");
writer.WriteValue("literal");
break;
case NodeType.Uri:
writer.WriteValue(obj.ToString());
writer.WritePropertyName("type");
writer.WriteValue("uri");
break;
default:
throw new RdfOutputException(WriterErrorMessages.UnknownNodeTypeUnserializable("RDF/JSON"));
}
writer.WriteEndObject();
}
//Terminate the Object which represents the Graph
writer.WriteEndObject();
}
