Example #1
0
  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();
  }
Example #2
0
  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();
  }
Example #3
0
  // 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);
    }
  }
Example #4
0
  /** 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();
  }
Example #5
0
  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;
  }
Example #6
0
 public static boolean isInstanceOf(Model r, Resource i, Resource cls) throws ModelException {
   return !r.find(i, RDF.type, cls).isEmpty();
 }