コード例 #1
0
  /**
   * 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();
    }
  }
コード例 #2
0
 public static TripleWithHash create(int n, String s) {
   Triple t = triple(s);
   return new TripleWithHash(n, t.getSubject(), t.getPredicate(), t.getObject());
 }