private RDFTerm readObject(bool acceptLiteral)
{
int ch = input.read();
if (ch < 0)
{
throw new ParserException();
}
else if (ch == '<')
{
return(RDFTerm.fromIRI(readIriReference()));
}
else if (acceptLiteral && (ch == '\"')) // start of quote literal
{
string str = readStringLiteral(ch);
return(finishStringLiteral(str));
}
else if (ch == '_') // Blank Node Label
{
if (input.read() != ':')
{
throw new ParserException();
}
string label = readBlankNodeLabel();
RDFTerm term = bnodeLabels[label];
if (term == null)
{
term = RDFTerm.fromBlankNode(label);
bnodeLabels.Add(label, term);
}
return(term);
}
else
{
throw new ParserException();
}
}
/*
* Replaces certain blank nodes with blank nodes whose
* names meet the N-Triples requirements
* @param triples A set of RDF triples
* @param bnodeLabels A mapping of blank node names
* already allocated. This method will modify this
* _object as needed to allocate new blank nodes.
*/
//
internal static void replaceBlankNodes(ISet <RDFTriple> triples,
IDictionary <string, RDFTerm> bnodeLabels)
{
if (bnodeLabels.Count == 0)
{
return;
}
IDictionary <string, RDFTerm> newBlankNodes = new PeterO.Support.LenientDictionary <string, RDFTerm>();
IList <RDFTriple[]> changedTriples = new List <RDFTriple[]>();
int[] nodeindex = new int[] { 0 };
foreach (var triple in triples)
{
bool changed = false;
RDFTerm subj = triple.getSubject();
if (subj.getKind() == RDFTerm.BLANK)
{
string oldname = subj.getValue();
string newname = suggestBlankNodeName(oldname, nodeindex, bnodeLabels);
if (!newname.Equals(oldname))
{
RDFTerm newNode = newBlankNodes[oldname];
if (newNode == null)
{
newNode = RDFTerm.fromBlankNode(newname);
bnodeLabels.Add(newname, newNode);
newBlankNodes.Add(oldname, newNode);
}
subj = newNode;
changed = true;
}
}
RDFTerm obj = triple.getObject();
if (obj.getKind() == RDFTerm.BLANK)
{
string oldname = obj.getValue();
string newname = suggestBlankNodeName(oldname, nodeindex, bnodeLabels);
if (!newname.Equals(oldname))
{
RDFTerm newNode = newBlankNodes[oldname];
if (newNode == null)
{
newNode = RDFTerm.fromBlankNode(newname);
bnodeLabels.Add(newname, newNode);
newBlankNodes.Add(oldname, newNode);
}
obj = newNode;
changed = true;
}
}
if (changed)
{
RDFTriple[] newTriple = new RDFTriple[] { triple,
new RDFTriple(subj, triple.getPredicate(), obj) };
changedTriples.Add(newTriple);
}
}
foreach (var triple in changedTriples)
{
triples.Remove(triple[0]);
triples.Add(triple[1]);
}
}