public Task <IEnumerable <KeyValuePair <Iri, IEnumerable <Statement> > > > Read(StreamReader streamReader)
{
if (streamReader == null)
{
throw new ArgumentNullException(nameof(streamReader));
}
var defaultGraph = new TypePrioritizingStatementCollection();
var graphMap = new Dictionary <Iri, IEnumerable <Statement> >();
var dataset = (RDFDataset)JsonLdProcessor.ToRDF(JSONUtils.FromReader(streamReader));
foreach (var graphName in dataset.GraphNames())
{
var graphIri = (graphName == "@default" ? null : (graphName.StartsWith("_:") ? new Iri() : new Iri(graphName)));
IEnumerable <Statement> statements;
if (graphIri == null)
{
statements = defaultGraph;
}
else if (!graphMap.TryGetValue(graphIri, out statements))
{
graphMap[graphIri] = statements = new TypePrioritizingStatementCollection();
}
var statementsCollection = (ICollection <Statement>)statements;
foreach (var quad in dataset.GetQuads(graphName))
{
statementsCollection.Add(quad.AsStatement());
}
}
return(Task.FromResult(new[] { new KeyValuePair <Iri, IEnumerable <Statement> >(null, defaultGraph) }.Concat(graphMap)));
}