Package org.openrdf.query.algebra

Examples of org.openrdf.query.algebra.Filter

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    public void meet(SameTerm sameTerm) {
      super.meet(sameTerm);

      if (sameTerm.getParentNode() instanceof Filter) {
        // SameTerm applies to the filter's argument
        Filter filter = (Filter)sameTerm.getParentNode();

        ValueExpr leftArg = sameTerm.getLeftArg();
        ValueExpr rightArg = sameTerm.getRightArg();

        // Verify that vars are bound by filterArg
        Set<String> bindingNames = filter.getArg().getBindingNames();

        if (leftArg instanceof Var && !bindingNames.contains(((Var)leftArg).getName())
            || rightArg instanceof Var && !bindingNames.contains(((Var)rightArg).getName()))
        {
          // One or both var(s) are unbound, this expression will never
          // return any results
          filter.replaceWith(new EmptySet());
          return;
        }

        if (leftArg instanceof Var && rightArg instanceof Var) {
          // Rename rightArg to leftArg
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    for (TupleExpr optTE : optionalTEs) {
      result = new LeftJoin(result, optTE);
    }

    for (ValueExpr constraint : constraints) {
      result = new Filter(result, constraint);
    }

    return result;
  }
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    ValueExpr constraint = sameTerms.get(0);
    for (int i = 0; i < sameTerms.size(); i++) {
      constraint = new Or(constraint, sameTerms.get(i));
    }

    result = new Filter(result, constraint);

    ProjectionElemList projElemList = new ProjectionElemList();
    projElemList.addElement(new ProjectionElem(subjVar.getName(), "subject"));
    projElemList.addElement(new ProjectionElem(predVar.getName(), "predicate"));
    projElemList.addElement(new ProjectionElem(objVar.getName(), "object"));
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Related Classes of org.openrdf.query.algebra.Filter

  • edu.mit.simile.backstage.model.TupleQueryBuilder
  • org.openrdf.query.algebra.evaluation.impl.ConjunctiveConstraintSplitter$ConstraintVisitor
  • org.openrdf.query.algebra.evaluation.impl.DisjunctiveConstraintOptimizer$OrSameTermOptimizer
  • org.openrdf.query.algebra.evaluation.impl.SameTermFilterOptimizer$SameTermFilterVisitor
  • org.openrdf.query.parser.serql.GraphPattern
  • org.openrdf.query.parser.sparql.GraphPattern
  • org.openrdf.query.parser.sparql.TupleExprBuilder
  • org.openrdf.sail.accesscontrol.AccessControlConnection$AccessControlQueryExpander
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