private static boolean matchNode(Item node, Item item, Match details) {
    if (isAny(item)) {
      details.anyMatches++;
      return true;
    }

    if (isAnyVar(item)) {
      details.varMatches++;
      return true;
    }

    if (node.isSymbol()) {
      // TERM in the thing to be matched means something concrete will be there.
      if (node.equals(TERM)) {
        if (item.equals(TERM)) {
          details.termMatches++;
          return true;
        }
        // Does not match LITERAL, URI, BNODE and VAR/ANY were done above.
        return false;
      }

      throw new ARQException("StatsMatcher: unexpected slot type: " + node);
    }

    if (!node.isNode()) return false;

    Node n = node.getNode();
    if (n.isConcrete()) {
      if (item.isNode() && item.getNode().equals(n)) {
        details.exactMatches++;
        return true;
      }

      if (isAnyTerm(item)) {
        details.termMatches++;
        return true;
      }

      if (isAnyURI(item) && n.isURI()) {
        details.termMatches++;
        return true;
      }
      if (isAnyLiteral(item) && n.isLiteral()) {
        details.termMatches++;
        return true;
      }
      if (isAnyBNode(item) && n.isBlank()) {
        details.termMatches++;
        return true;
      }
    }
    return false;
  }
Exemplo n.º 2
0
 protected Object extractBinding(Map<String, Node> binds, int nodeIndex) {
   Node node = this.nodes[nodeIndex];
   if (node.isVariable()) {
     Node boundNode = binds.get(this.nodes[nodeIndex].getName());
     if (boundNode == null) {
       throw new UnsupportedOperationException("Unbound variable");
     }
     node = boundNode;
   }
   if (node.isConcrete()) {
     Node_Concrete lit = (Node_Concrete) node;
     if (lit.isLiteral()) return lit.getLiteralValue();
     else if (lit.isURI()) return lit.getURI();
     else if (lit.isBlank()) return lit.getBlankNodeLabel();
   }
   throw new UnsupportedOperationException("Incorrect node type for comparison: " + node);
 }
Exemplo n.º 3
0
  /**
   * Builds up statements like [] rr:template "http://data.example.com/department/{DEPTNO}" or []
   * rr:class ex:Department and returns them as a Statement List.
   *
   * @param r2rml the target com.hp.hpl.jena.rdf.model.Model
   * @param mappingData the target that should be mapped to relational structures (subject,
   *     predicate or object)
   * @param varDefs the construction definition of the target value based in the actual database
   *     value and some additional data like prefix strings or certain functions like uri( ... )
   * @return a List<Statement> containing all the subject map statements
   */
  private List<Statement> buildMapStatements(Model r2rml, Node mappingData, VarDefinition varDefs) {

    List<Statement> results = new ArrayList<Statement>();

    // a blank node []
    Resource mapSubject = ResourceFactory.createResource();
    // rr:template or rr:column or rr:constant
    Property mapPredicate;
    // a literal like "http://data.example.com/department/{DEPTNO}" or
    // simply "DEPTNO" (column name) or a constant "Foo bar!!"
    // (or in rare cases a URI, which is handled separately)
    Literal mapObject;

    // template or column or constant
    if (mappingData.isVariable()) {
      Collection<RestrictedExpr> restrictions = varDefs.getDefinitions((Var) mappingData);
      List<PredicateAndObject> mapPredicateAndObjects = processRestrictions(restrictions);

      for (PredicateAndObject result : mapPredicateAndObjects) {

        mapPredicate = result.getPrediacte();
        Statement resultStatement;
        RDFNode rawObject = result.getRawObject();

        // object is literal
        if (rawObject.isLiteral()) {
          mapObject = rawObject.asLiteral();
          resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapObject);

          // object is blank node
        } else if (rawObject.isAnon()) {
          Resource mapResObject = rawObject.asResource();
          resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapResObject);

          // object is resource
        } else {
          Resource mapResObject = rawObject.asResource();
          resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapResObject);
        }

        results.add(resultStatement);
      }

      // everything that is not a variable is handled as a constant
    } else if (mappingData.isConcrete()) {
      // URIs and Literals have to be handled separately since the methods
      // to retrieve the respective value are different

      Statement resultStatement;

      // URI
      if (mappingData.isURI()) {
        /*
         * This case is somewhat special since the mapObject is not a
         * Literal. So, this needs some special handling:
         * - the Literal mapObject will not be used
         * - a special mapObject_uri Resource will be created
         * - the result will be created, appended to the List and
         *   returned to not go through any further ordinary processing
         */

        Resource mapObject_uri = ResourceFactory.createResource(mappingData.getURI());
        mapPredicate = ResourceFactory.createProperty(rrNamespace, "constant");

        resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapObject_uri);
        results.add(resultStatement);

        return results;

        // Literal
      } else if (mappingData.isLiteral()) {

        mapObject = ResourceFactory.createPlainLiteral(mappingData.getLiteral().toString(false));

        // else (e.g. blank node)
      } else { // mapSubject.isBlank() == true
        /*
         * Hmm... I think this violates the standard. So lean back and
         *  enjoy the trace...
         */

        mapObject = null;
      }

      mapPredicate = ResourceFactory.createProperty(rrPrefix, "constant");

      resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapObject);
      results.add(resultStatement);
    }

    return results;
  }