public static void collectLiterals(Model m, Collection target) throws ModelException {
for (Enumeration en = m.elements(); en.hasMoreElements(); ) {
Statement st = (Statement) en.nextElement();
if (st.object() instanceof Literal) target.add(st.object());
}
}
// FIXME: what if reification is an endless loop?
public static void collectNamespaces(Statement st, Collection target) throws ModelException {
if (st.subject() instanceof Statement) collectNamespaces((Statement) st.subject(), target);
else collectNamespaces(st.subject(), target);
collectNamespaces(st.predicate(), target);
if (st.object() instanceof Statement) collectNamespaces((Statement) st.object(), target);
else if (st.object() instanceof Resource) collectNamespaces((Resource) st.object(), target);
}
public static Hashtable getNodes(Model m) throws ModelException {
Hashtable t = new Hashtable();
for (Enumeration en = m.elements(); en.hasMoreElements(); ) {
Statement s = (Statement) en.nextElement();
t.put(s.subject(), s.subject());
t.put(s.object(), s.object());
}
return t;
}
public static void collectResources(Model m, Collection target) throws ModelException {
for (Enumeration en = m.elements(); en.hasMoreElements(); ) {
Statement st = (Statement) en.nextElement();
if (!(st.object() instanceof Literal) && !(st.object() instanceof Statement))
target.add(st.object());
target.add(st.subject());
target.add(st.predicate());
}
}
// 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);
}
}
// returns list of statements
protected static void replaceMultSPO(
Statement st, NodeFactory f, Map o2n, Collection result, RDFNode toReplace, int position)
throws ModelException {
Collection replacements;
if (toReplace instanceof Statement) {
List l = new ArrayList();
replaceMult((Statement) toReplace, f, o2n, l);
if (l.size() == 1 && toReplace == l.get(0)) {
result.add(st);
return; // keep the same
} else replacements = l;
} else {
Object ro = o2n.get(toReplace);
if (ro instanceof Collection) replacements = (Collection) ro;
else if (ro != null) {
replacements = new ArrayList();
replacements.add(ro);
} else { // no replacement needed
result.add(st); // keep the same statement
return;
}
}
for (Iterator it = replacements.iterator(); it.hasNext(); ) {
Statement rs = null;
Object rr = it.next();
switch (position) {
case 0:
rs = f.createStatement((Resource) rr, st.predicate(), st.object());
break;
case 1:
rs = f.createStatement(st.subject(), (Resource) rr, st.object());
break;
case 2:
rs = f.createStatement(st.subject(), st.predicate(), (RDFNode) rr);
break;
}
result.add(rs);
}
}
// returns list of statements
public static void replaceMult(Statement st, NodeFactory f, Map o2n, Collection result)
throws ModelException {
List l1 = new ArrayList();
replaceMultSPO(st, f, o2n, l1, st.subject(), 0);
List l2 = new ArrayList();
for (int i = 0; i < l1.size(); i++)
replaceMultSPO((Statement) l1.get(i), f, o2n, l2, st.predicate(), 1);
for (int i = 0; i < l2.size(); i++)
replaceMultSPO((Statement) l2.get(i), f, o2n, result, st.object(), 2);
}
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;
}
/** Removes all triples which have something to do with the given namespace */
public static Model removeNamespace(String ns, Model m) throws ModelException {
Model res = m.duplicate();
for (Enumeration en = m.duplicate().elements(); en.hasMoreElements(); ) {
Statement t = (Statement) en.nextElement();
if (t.subject().toString().startsWith(ns)
|| t.predicate().toString().startsWith(ns)
|| t.object().toString().startsWith(ns)) {
// System.err.println("REMOVING TRIPLE: " + t);
res.remove(t);
}
}
return res;
}
public static Statement replaceNamespace(
Statement st, String o, String n, NodeFactory f, Map o2n, Set resourcesToIgnore)
throws ModelException {
boolean replaced = false;
Resource subj = st.subject();
Resource pred = st.predicate();
RDFNode obj = st.object();
if (obj instanceof Resource
&& !(obj instanceof Statement)
&& o.equals(((Resource) obj).getNamespace())
&& (resourcesToIgnore == null || !resourcesToIgnore.contains(obj))) {
replaced = true;
Resource r = f.createResource(n, ((Resource) obj).getLocalName());
if (o2n != null) o2n.put(obj, r);
obj = r;
}
if (o.equals(subj.getNamespace())
&& (resourcesToIgnore == null || !resourcesToIgnore.contains(subj))) {
replaced = true;
Resource r = f.createResource(n, subj.getLocalName());
if (o2n != null) o2n.put(subj, r);
subj = r;
}
if (o.equals(pred.getNamespace())
&& (resourcesToIgnore == null || !resourcesToIgnore.contains(pred))) {
replaced = true;
Resource r = f.createResource(n, pred.getLocalName());
if (o2n != null) o2n.put(pred, r);
pred = r;
}
return replaced ? f.createStatement(subj, pred, obj) : st;
}
public static Statement replaceResources(Statement st, NodeFactory f, Map o2n)
throws ModelException {
boolean replaced = false;
Resource subj = st.subject();
Resource pred = st.predicate();
RDFNode obj = st.object();
Object n = null;
if (obj instanceof Statement) {
n = obj;
obj = replaceResources((Statement) obj, f, o2n);
replaced = n != obj;
} else if ((n = o2n.get(obj)) != null) {
replaced = true;
obj = (RDFNode) n;
}
if (subj instanceof Statement) {
n = subj;
subj = replaceResources((Statement) subj, f, o2n);
replaced = n != subj;
}
if ((n = o2n.get(subj)) != null) {
replaced = true;
subj = (Resource) n;
}
if ((n = o2n.get(pred)) != null) {
replaced = true;
pred = (Resource) n;
}
return replaced ? f.createStatement(subj, pred, obj) : st;
}