/** returns true if old triples from r were removed */
public static boolean setUniqueObject(
Model r, Resource subject, Resource predicate, RDFNode object) throws ModelException {
Model old = r.find(subject, predicate, null);
SetOperations.subtract(r, old);
Statement stmt = get1(old);
if (subject == null && stmt != null) subject = stmt.subject();
if (predicate == null && stmt != null) predicate = stmt.predicate();
r.add(r.getNodeFactory().createStatement(subject, predicate, object));
return !old.isEmpty();
}
/**
* @return a new model in which all occurrences of the old namespace are replaced by the new one.
* All replaced resources are summarized in the map if not null. If resourcesToIgnore != null,
* ignore resources listed there.
*/
public static Model replaceNamespace(Model m, String o, String n, Map o2n, Set resourcesToIgnore)
throws ModelException {
Model res = m.create();
NodeFactory f = m.getNodeFactory();
Enumeration en = m.elements();
while (en.hasMoreElements()) {
Statement st = (Statement) en.nextElement();
res.add(replaceNamespace(st, o, n, f, o2n, resourcesToIgnore));
}
return res;
}
/**
* @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 src, Model dest, Map o2n) throws ModelException {
NodeFactory f = src.getNodeFactory();
Enumeration en = src.elements();
int replaced = 0;
while (en.hasMoreElements()) {
Statement st = (Statement) en.nextElement();
Statement st_n = replaceResources(st, f, o2n);
dest.add(st_n);
if (st_n != st) // yes, pointer comparison
replaced++;
}
return replaced;
}
/**
* @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();
}
/** Creates a new unique unnamed resource. */
public static Resource noname(Model m) throws ModelException {
return m.getNodeFactory().createUniqueResource();
}
public static void add(Model m, Resource subject, Resource predicate, RDFNode object)
throws ModelException {
m.add(m.getNodeFactory().createStatement(subject, predicate, object));
}
/** @param an RDF model to fill with triples. This frequently will be an empty model. */
public ModelConsumer(Model empty) throws ModelException {
this.model = empty;
nodeFactory = model.getNodeFactory();
}