private static void WriteNode(XmlWriter writer, string id, string label)
{
writer.WriteStartElement(GraphMLSpecsHelper.Node);
writer.WriteAttributeString(GraphMLSpecsHelper.Id, id);
GraphMLWriter.WriteData(writer, GraphMLSpecsHelper.NodeLabel, label);
writer.WriteEndElement();
}
private static void WriteGraphML(XmlWriter writer, ITripleStore store, bool collapseLiterals)
{
writer.WriteStartElement(GraphMLSpecsHelper.GraphML, GraphMLSpecsHelper.NS);
GraphMLWriter.WriteKey(writer, GraphMLSpecsHelper.EdgeLabel, GraphMLSpecsHelper.Edge);
GraphMLWriter.WriteKey(writer, GraphMLSpecsHelper.NodeLabel, GraphMLSpecsHelper.Node);
foreach (var graph in store.Graphs)
{
GraphMLWriter.WriteGraph(writer, graph, collapseLiterals);
}
writer.WriteEndElement();
}
private static void WriteEdge(XmlWriter writer, Triple triple, bool collapseLiterals)
{
writer.WriteStartElement(GraphMLSpecsHelper.Edge);
writer.WriteAttributeString(GraphMLSpecsHelper.Source, triple.Subject.GetHashCode().ToString());
writer.WriteStartAttribute(GraphMLSpecsHelper.Target);
var id = GraphMLWriter.CalculateNodeId(triple.Object, triple, collapseLiterals);
writer.WriteString(id.GetHashCode().ToString());
GraphMLWriter.WriteData(writer, GraphMLSpecsHelper.EdgeLabel, triple.Predicate.ToString());
writer.WriteEndElement();
}
private static void WriteGraph(XmlWriter writer, IGraph graph, bool collapseLiterals)
{
writer.WriteStartElement(GraphMLSpecsHelper.Graph);
// Named graphs
if (graph.BaseUri != null)
{
writer.WriteAttributeString(GraphMLSpecsHelper.Id, graph.BaseUri.AbsoluteUri);
}
// RDF is always a directed graph
writer.WriteAttributeString(GraphMLSpecsHelper.Edgedefault, GraphMLSpecsHelper.Directed);
GraphMLWriter.WriteTriples(writer, graph, collapseLiterals);
writer.WriteEndElement();
}
private static void WriteTriples(XmlWriter writer, IGraph graph, bool collapseLiterals)
{
var nodesAlreadyWritten = new HashSet <object>();
foreach (var triple in graph.Triples)
{
foreach (var node in new[] { triple.Subject, triple.Object })
{
var id = GraphMLWriter.CalculateNodeId(node, triple, collapseLiterals);
// Skip if already written
if (nodesAlreadyWritten.Add(id))
{
GraphMLWriter.WriteNode(writer, id.GetHashCode().ToString(), node.ToString());
}
}
GraphMLWriter.WriteEdge(writer, triple, collapseLiterals);
}
}
/// <summary>
/// Saves a triple store to an XML writer in GraphML format.
/// </summary>
/// <param name="store">The source triple store.</param>
/// <param name="output">The target XML writer.</param>
public void Save(ITripleStore store, XmlWriter output)
{
GraphMLWriter.WriteGraphML(output, store, this.CollapseLiterals);
}
