/**
* Populates the namespaces map with default namespaces and namespaces used by the graph.
*
* @param graph Graph
* @throws GraphException
*/
protected void populateNamespaces(Graph graph) throws GraphException {
// default namespaces
namespaces = new HashMap<String, String>();
namespaces.put(RDF_PREFIX, RDF.BASE_URI.toString());
namespaces.put(RDFS_PREFIX, RDFS.BASE_URI.toString());
namespaces.put("owl", "http://www.w3.org/2002/07/owl#");
namespaces.put("dc", "http://purl.org/dc/elements/1.1/");
// validate graph before reading
if (graph == null) {
throw new IllegalArgumentException("Graph argument is null.");
}
// get all statements
ClosableIterator<Triple> tripleIter = graph.find(null, null, null);
if (tripleIter != null) {
while (tripleIter.hasNext()) {
// get the next triple
Triple triple = tripleIter.next();
if (triple != null) {
// evaluate subject
SubjectNode subject = triple.getSubject();
if (subject instanceof URIReference) {
addNamespaceURI(((URIReference) subject).getURI());
}
// evaluate predicate (must be URIReference)
PredicateNode predicate = triple.getPredicate();
addNamespaceURI(((URIReference) predicate).getURI());
// evaluate object
ObjectNode object = triple.getObject();
if (object instanceof URIReference) {
addNamespaceURI(((URIReference) object).getURI());
}
}
}
// close the Iterator
tripleIter.close();
}
}
/** @see org.mulgara.resolver.spi.Statements#getObject() */
@Override
public long getObject() throws TuplesException {
ObjectNode o = currentRow.getObject();
try {
return session.localize(o);
} catch (LocalizeException e) {
throw new TuplesException("Unable to localize object: " + o);
}
}
/** @see org.mulgara.resolver.spi.Statements#getPredicate() */
@Override
public long getPredicate() throws TuplesException {
PredicateNode p = currentRow.getPredicate();
try {
return session.localize(p);
} catch (LocalizeException e) {
throw new TuplesException("Unable to localize predicate: " + p);
}
}
/** @see org.mulgara.resolver.spi.Statements#getSubject() */
@Override
public long getSubject() throws TuplesException {
SubjectNode s = currentRow.getSubject();
try {
return session.localize(s);
} catch (LocalizeException e) {
throw new TuplesException("Unable to localize subject: " + s);
}
}
