//    @SuppressWarnings("null")
  //    @Override
  @Override
  protected ExtendedIterator<Triple> graphBaseFind(TripleMatch m) {
    Node s = m.getMatchSubject();
    Var sVar = null;
    if (s == null) {
      sVar = Var.alloc("s");
      s = sVar;
    }

    Node p = m.getMatchPredicate();
    Var pVar = null;
    if (p == null) {
      pVar = Var.alloc("p");
      p = pVar;
    }

    Node o = m.getMatchObject();
    Var oVar = null;
    if (o == null) {
      oVar = Var.alloc("o");
      o = oVar;
    }

    Triple triple = new Triple(s, p, o);

    // Evaluate as an algebra expression
    BasicPattern pattern = new BasicPattern();
    pattern.add(triple);
    Op op = new OpBGP(pattern);

    //        // Make remote execution object.
    //        System.err.println("GraphSPARQLService.graphBaseFind: Unimplemented : remote service
    // execution") ;
    //        //Plan plan = factory.create(op, getDataset(), BindingRoot.create(), null) ;
    //
    //        QueryIterator qIter = plan.iterator() ;
    //        List<Triple> triples = new ArrayList<Triple>() ;
    //
    //
    //        for (; qIter.hasNext() ; )
    //        {
    //            Binding b = qIter.nextBinding() ;
    //            Node sResult = s ;
    //            Node pResult = p ;
    //            Node oResult = o ;
    //            if ( sVar != null )
    //                sResult = b.get(sVar) ;
    //            if ( pVar != null )
    //                pResult = b.get(pVar) ;
    //            if ( oVar != null )
    //                oResult = b.get(oVar) ;
    //            Triple resultTriple = new Triple(sResult, pResult, oResult) ;
    //            if ( log.isDebugEnabled() )
    //                log.debug("  "+resultTriple) ;
    //            triples.add(resultTriple) ;
    //        }
    //        qIter.close() ;
    //        return WrappedIterator.createNoRemove(triples.iterator()) ;
    return null;
  }
Пример #2
0
  /**
   * Takes a concept and adds
   *
   * @return
   */
  public static Concept createPropertyQuery(Concept concept) {
    Collection<Var> vars = PatternVars.vars(concept.getElement());
    List<String> varNames = VarUtils.getVarNames(vars);

    Var s = concept.getVar();

    Generator gen = GeneratorBlacklist.create("v", varNames);
    Var p = Var.alloc(gen.next());
    Var o = Var.alloc(gen.next());

    Triple triple = new Triple(s, p, o);

    BasicPattern bp = new BasicPattern();
    bp.add(triple);

    List<Element> elements;
    if (concept.isSubjectConcept()) {
      elements = new ArrayList<Element>();
    } else {
      elements = concept.getElements();
    }
    elements.add(new ElementTriplesBlock(bp));

    Concept result = new Concept(elements, p);

    return result;
  }
Пример #3
0
    @Override
    public Op transform(OpQuadPattern quadPattern) {
      Node gNode = quadPattern.getGraphNode();
      Node g = substitute(gNode, binding);

      BasicPattern triples = new BasicPattern();
      for (Triple triple : quadPattern.getBasicPattern()) {
        Node s = substitute(triple.getSubject(), binding);
        Node p = substitute(triple.getPredicate(), binding);
        Node o = substitute(triple.getObject(), binding);
        Triple t = new Triple(s, p, o);
        triples.add(t);
      }

      // Pure quading.
      // for ( Iterator iter = quadPattern.getQuads().iterator() ;
      // iter.hasNext() ; )
      // {
      // Quad quad = (Quad)iter.next() ;
      // if ( ! quad.getGraph().equals(gNode) )
      // throw new
      // ARQInternalErrorException("Internal error: quads block is not uniform over the graph node")
      // ;
      // Node s = substitute(quad.getSubject(), binding) ;
      // Node p = substitute(quad.getPredicate(), binding) ;
      // Node o = substitute(quad.getObject(), binding) ;
      // Triple t = new Triple(s, p, o) ;
      // triples.add(t) ;
      // }

      return new OpQuadPattern(g, triples);
    }
Пример #4
0
  /**
   * Puts binding values to the appripriate places in the given BGP, and also adds indexes to
   * variable names.
   *
   * @param bgp
   * @param binding
   * @param index
   * @return
   */
  public static BasicPattern substitute(BasicPattern bgp, Binding binding, int index) {
    if (isNotNeeded(binding)) return bgp;

    BasicPattern bgp2 = new BasicPattern();
    // BGP deki tüm triple lar dolaşılıyor yerine koymak adına
    for (Triple triple : bgp) {
      // Binding listteki bindingler de UNION lanmak için dolaşılıyor.
      Triple t = substitute(triple, binding, index);
      bgp2.add(t);
    }
    return bgp2;
  }
  /**
   * Return a new basic pattern with the same triples as the input, but ordered as per the index
   * list of this reorder processor.
   */
  @Override
  public BasicPattern reorder(BasicPattern bgp) {
    if (indexes.length != bgp.size()) {
      String str =
          String.format(
              "Expected size = %d : actual basic pattern size = %d", indexes.length, bgp.size());
      Log.fatal(this, str);
      throw new ARQException(str);
    }

    BasicPattern bgp2 = new BasicPattern();
    for (int j = 0; j < indexes.length; j++) {
      int idx = indexes[j];
      Triple t = bgp.get(idx);
      bgp2.add(t);
    }
    return bgp2;
  }