/// <summary>
/// Generates the Output for a Graph as a String in CSV syntax
/// </summary>
/// <param name="globalContext">Context for writing the Store</param>
/// <param name="context">Context for writing the Graph</param>
/// <returns></returns>
private String GenerateGraphOutput(ThreadedStoreWriterContext globalContext, BaseWriterContext context)
{
if (!WriterHelper.IsDefaultGraph(context.Graph.BaseUri))
{
//Named Graphs have a fourth context field added
foreach (Triple t in context.Graph.Triples)
{
this.GenerateNodeOutput(context, t.Subject, TripleSegment.Subject);
context.Output.Write(',');
this.GenerateNodeOutput(context, t.Predicate, TripleSegment.Predicate);
context.Output.Write(',');
this.GenerateNodeOutput(context, t.Object, TripleSegment.Object);
context.Output.Write(',');
context.Output.Write(this._formatter.FormatUri(context.Graph.BaseUri));
context.Output.Write("\r\n");
}
}
else
{
//Default Graph has an empty field added
foreach (Triple t in context.Graph.Triples)
{
this.GenerateNodeOutput(context, t.Subject, TripleSegment.Subject);
context.Output.Write(',');
this.GenerateNodeOutput(context, t.Predicate, TripleSegment.Predicate);
context.Output.Write(',');
this.GenerateNodeOutput(context, t.Object, TripleSegment.Object);
context.Output.Write(',');
context.Output.Write("\r\n");
}
}
return(context.Output.ToString());
}
/// <summary>
/// Thread Worker method which writes Graphs to the output
/// </summary>
/// <param name="globalContext">Context for writing the Store</param>
private void SaveGraphs(TriGWriterContext globalContext)
{
try
{
Uri u = globalContext.GetNextUri();
while (u != null)
{
//Get the Graph from the Store
if (WriterHelper.IsDefaultGraph(u) && !globalContext.Store.HasGraph(u))
{
u = null;
}
IGraph g = globalContext.Store.Graphs[u];
//Generate the Graph Output and add to Stream
TurtleWriterContext context = new TurtleWriterContext(g, new System.IO.StringWriter(), globalContext.PrettyPrint, globalContext.HighSpeedModePermitted);
if (globalContext.CompressionLevel > WriterCompressionLevel.None)
{
context.NodeFormatter = new TurtleFormatter(globalContext.QNameMapper);
}
else
{
context.NodeFormatter = new UncompressedTurtleFormatter();
}
String graphContent = this.GenerateGraphOutput(globalContext, context);
try
{
Monitor.Enter(globalContext.Output);
globalContext.Output.WriteLine(graphContent);
globalContext.Output.Flush();
}
catch
{
throw;
}
finally
{
Monitor.Exit(globalContext.Output);
}
//Get the Next Uri
u = globalContext.GetNextUri();
}
}
catch (ThreadAbortException)
{
//We've been terminated, don't do anything
#if !SILVERLIGHT
Thread.ResetAbort();
#endif
}
catch (Exception ex)
{
throw new RdfStorageException("Error in Threaded Writer in Thread ID " + Thread.CurrentThread.ManagedThreadId, ex);
}
}
/// <summary>
/// Thread Worker method which writes Graphs to the output
/// </summary>
/// <param name="globalContext">Context for writing the Store</param>
private void SaveGraphs(ThreadedStoreWriterContext globalContext)
{
try
{
Uri u = globalContext.GetNextUri();
while (u != null)
{
//Get the Graph from the Store
if (WriterHelper.IsDefaultGraph(u) && !globalContext.Store.HasGraph(u))
{
u = null;
}
IGraph g = globalContext.Store.Graphs[u];
//Generate the Graph Output and add to Stream
NTriplesWriterContext context = new NTriplesWriterContext(g, new System.IO.StringWriter(), globalContext.PrettyPrint, globalContext.HighSpeedModePermitted);
String graphContent = this.GraphToNQuads(globalContext, context);
if (!graphContent.Equals(String.Empty))
{
try
{
Monitor.Enter(globalContext.Output);
globalContext.Output.WriteLine(graphContent);
globalContext.Output.Flush();
}
catch
{
throw;
}
finally
{
Monitor.Exit(globalContext.Output);
}
}
//Get the Next Uri
u = globalContext.GetNextUri();
}
}
catch (ThreadAbortException)
{
//We've been terminated, don't do anything
#if !SILVERLIGHT
Thread.ResetAbort();
#endif
}
catch (Exception ex)
{
throw new RdfStorageException("Error in Threaded Writer in Thread ID " + Thread.CurrentThread.ManagedThreadId, ex);
}
}
private String GraphToNQuads(ThreadedStoreWriterContext globalContext, NTriplesWriterContext context)
{
if (context.Graph.IsEmpty)
{
return(String.Empty);
}
if (context.PrettyPrint && !WriterHelper.IsDefaultGraph(context.Graph.BaseUri))
{
context.Output.WriteLine("# Graph: " + context.Graph.BaseUri.ToString());
}
foreach (Triple t in context.Graph.Triples)
{
context.Output.WriteLine(this.TripleToNQuads(context, t));
}
context.Output.WriteLine();
return(context.Output.ToString());
}
/// <summary>
/// Converts a Triple into relevant NQuads Syntax
/// </summary>
/// <param name="context">Writer Context</param>
/// <param name="t">Triple to convert</param>
/// <returns></returns>
private String TripleToNQuads(NTriplesWriterContext context, Triple t)
{
StringBuilder output = new StringBuilder();
output.Append(this.NodeToNTriples(context, t.Subject, TripleSegment.Subject));
output.Append(" ");
output.Append(this.NodeToNTriples(context, t.Predicate, TripleSegment.Predicate));
output.Append(" ");
output.Append(this.NodeToNTriples(context, t.Object, TripleSegment.Object));
if (t.GraphUri != null && !WriterHelper.IsDefaultGraph(t.GraphUri))
{
output.Append(" <");
output.Append(context.UriFormatter.FormatUri(t.GraphUri));
output.Append(">");
}
output.Append(" .");
return(output.ToString());
}
private void GraphToTriX(IGraph g, XmlWriter writer)
{
//Create the <graph> element
writer.WriteStartElement("graph");
//Is the Graph Named?
if (!WriterHelper.IsDefaultGraph(g.BaseUri))
{
if (!g.BaseUri.ToString().StartsWith("trix:local:"))
{
writer.WriteStartElement("uri");
writer.WriteRaw(WriterHelper.EncodeForXml(g.BaseUri.ToString()));
writer.WriteEndElement();
}
else
{
writer.WriteStartElement("id");
writer.WriteRaw(WriterHelper.EncodeForXml(g.BaseUri.ToString().Substring(11)));
writer.WriteEndElement();
}
}
//Output the Triples
foreach (Triple t in g.Triples)
{
writer.WriteStartElement("triple");
this.NodeToTriX(t.Subject, writer);
this.NodeToTriX(t.Predicate, writer);
this.NodeToTriX(t.Object, writer);
//</triple>
writer.WriteEndElement();
}
//</graph>
writer.WriteEndElement();
}
/// <summary>
/// Generates the Output for a Graph as a String in TriG syntax
/// </summary>
/// <param name="globalContext">Context for writing the Store</param>
/// <param name="context">Context for writing the Graph</param>
/// <returns></returns>
private String GenerateGraphOutput(TriGWriterContext globalContext, TurtleWriterContext context)
{
if (!WriterHelper.IsDefaultGraph(context.Graph.BaseUri))
{
//Named Graph
String gname;
String sep = (globalContext.N3CompatabilityMode) ? " = " : " ";
if (globalContext.CompressionLevel > WriterCompressionLevel.None && globalContext.QNameMapper.ReduceToQName(context.Graph.BaseUri.ToString(), out gname))
{
if (TurtleSpecsHelper.IsValidQName(gname))
{
context.Output.WriteLine(gname + sep + "{");
}
else
{
context.Output.WriteLine("<" + context.UriFormatter.FormatUri(context.Graph.BaseUri) + ">" + sep + "{");
}
}
else
{
context.Output.WriteLine("<" + context.UriFormatter.FormatUri(context.Graph.BaseUri) + ">" + sep + "{");
}
}
else
{
context.Output.WriteLine("{");
}
//Generate Triples
this.GenerateTripleOutput(globalContext, context);
//Close the Graph
context.Output.WriteLine("}");
return(context.Output.ToString());
}