/**
* Renders the triples whose subject is the specified node
*
* @param node The node
*/
@Override
public void render(RDFResourceNode node) {
level++;
if (pending.contains(node)) {
// We essentially remove all structure sharing during parsing - any cycles therefore indicate
// a bug!
throw new IllegalStateException(
"Rendering cycle! This indicates structure sharing and should not happen!");
}
pending.add(node);
Set<RDFTriple> triples = new TreeSet<RDFTriple>(new TripleComparator());
triples.addAll(getGraph().getTriplesForSubject(node));
RDFResourceNode lastSubject = null;
RDFResourceNode lastPredicate = null;
boolean first = true;
for (RDFTriple triple : triples) {
RDFResourceNode subj = triple.getSubject();
RDFResourceNode pred = triple.getProperty();
if (lastSubject != null && (subj.equals(lastSubject) || subj.isAnonymous())) {
if (lastPredicate != null && pred.equals(lastPredicate)) {
// Only the object differs from previous triple
// Just write the object
write(" ,");
writeNewLine();
write(triple.getObject());
} else {
// The predicate, object differ from previous triple
// Just write the predicate and object
write(" ;");
popTab();
if (!subj.isAnonymous()) {
writeNewLine();
}
writeNewLine();
write(triple.getProperty());
write(" ");
pushTab();
write(triple.getObject());
}
} else {
if (!first) {
popTab();
popTab();
writeNewLine();
}
// Subject, preficate and object are different from last triple
if (!node.isAnonymous()) {
write(triple.getSubject());
write(" ");
} else {
pushTab();
write("[");
write(" ");
}
pushTab();
write(triple.getProperty());
write(" ");
pushTab();
write(triple.getObject());
}
lastSubject = subj;
lastPredicate = pred;
first = false;
}
if (node.isAnonymous()) {
popTab();
popTab();
if (triples.isEmpty()) {
write("[ ");
} else {
writeNewLine();
}
write("]");
popTab();
} else {
popTab();
popTab();
}
if (level == 1 && !triples.isEmpty()) {
write(" .\n");
}
writer.flush();
pending.remove(node);
level--;
}
