// FIXME: use digest instead of size
static void getReachable(Resource r, Model m, Model result) throws ModelException {
int oldSize = result.size();
Model directlyReachable = m.find(r, null, null);
SetOperations.unite(result, directlyReachable);
if (result.size() == oldSize) return;
for (Enumeration en = directlyReachable.elements(); en.hasMoreElements(); ) {
Statement t = (Statement) en.nextElement();
if (t.object() instanceof Resource) getReachable((Resource) t.object(), m, result);
}
}
public static Resource getSubject(Model r, Resource predicate, RDFNode object)
throws ModelException {
Model m = r.find(null, predicate, object);
if (m == null || m.size() == 0) return null;
// if(m.size() > 1)
// throw new RuntimeException("Model contains more than one triple");
return ((Statement) m.elements().nextElement()).subject();
}
public static RDFNode getObject(Model r, Resource subject, Resource predicate)
throws ModelException {
Model m = r.find(subject, predicate, null);
if (m == null || m.size() == 0) return null;
// if(m.size() > 1)
// throw new RuntimeException("Model contains more than one triple");
// FIXME: we do not check whether it is a resource or literal
return ((Statement) m.elements().nextElement()).object();
}
/** Collects the triples of a model into an array. */
public static Statement[] getStatementArray(Model m) throws ModelException {
Statement[] v = new Statement[m.size()];
int i = 0;
for (Enumeration en = m.elements(); en.hasMoreElements(); ) {
Statement t = (Statement) en.nextElement();
v[i++] = t;
}
return v;
}
public static List getObjects(Model m, Resource subject, Resource predicate)
throws ModelException {
List result = new ArrayList();
if (m == null || m.size() == 0) return result;
for (Enumeration en = m.find(subject, predicate, null).elements(); en.hasMoreElements(); ) {
Statement st = (Statement) en.nextElement();
result.add(st.object());
}
return result;
}
/**
* @return a new model in which all occurrences of the old resources are replaced by the new ones.
* Returns number replacements done.
*/
public static int replaceResources(Model m, Map o2n) throws ModelException {
NodeFactory f = m.getNodeFactory();
Enumeration en = m.elements();
Model toRemove = m.create();
Model toAdd = m.create();
while (en.hasMoreElements()) {
Statement st = (Statement) en.nextElement();
Statement st_n = replaceResources(st, f, o2n);
if (st_n != st) { // yes, pointer comparison
toAdd.add(st_n);
toRemove.add(st);
}
}
SetOperations.subtract(m, toRemove);
SetOperations.unite(m, toAdd);
return toAdd.size();
}