Examples of org.openrdf.query.algebra.TupleExpr

org.openrdf.query.algebra.TupleExpr
An expression that evaluates to RDF tuples.


  @Override
  public TupleExpr visit(ASTTupleIntersect node, Object data)
    throws VisitorException
  {
    TupleExpr leftArg = (TupleExpr)node.getLeftArg().jjtAccept(this, null);
    TupleExpr rightArg = (TupleExpr)node.getRightArg().jjtAccept(this, null);


    return new Intersection(leftArg, rightArg);
  }

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  @Override
  public TupleExpr visit(ASTGraphUnion node, Object data)
    throws VisitorException
  {
    TupleExpr leftArg = (TupleExpr)node.getLeftArg().jjtAccept(this, null);
    TupleExpr rightArg = (TupleExpr)node.getRightArg().jjtAccept(this, null);


    TupleExpr result = new Union(leftArg, rightArg);


    if (node.isDistinct()) {
      result = new Distinct(result);
    }

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  @Override
  public TupleExpr visit(ASTGraphMinus node, Object data)
    throws VisitorException
  {
    TupleExpr leftArg = (TupleExpr)node.getLeftArg().jjtAccept(this, null);
    TupleExpr rightArg = (TupleExpr)node.getRightArg().jjtAccept(this, null);


    return new Difference(leftArg, rightArg);
  }

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  @Override
  public TupleExpr visit(ASTGraphIntersect node, Object data)
    throws VisitorException
  {
    TupleExpr leftArg = (TupleExpr)node.getLeftArg().jjtAccept(this, null);
    TupleExpr rightArg = (TupleExpr)node.getRightArg().jjtAccept(this, null);


    return new Intersection(leftArg, rightArg);
  }

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  @Override
  public TupleExpr visit(ASTSelectQuery node, Object data)
    throws VisitorException
  {
    TupleExpr tupleExpr;


    ASTQueryBody queryBodyNode = node.getQueryBody();


    if (queryBodyNode != null) {
      // Build tuple expression for query body

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  @Override
  public TupleExpr visit(ASTSelect node, Object data)
    throws VisitorException
  {
    TupleExpr result = (TupleExpr)data;


    Extension extension = new Extension();
    ProjectionElemList projElemList = new ProjectionElemList();


    for (ASTProjectionElem projElemNode : node.getProjectionElemList()) {

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  @Override
  public TupleExpr visit(ASTConstructQuery node, Object data)
    throws VisitorException
  {
    TupleExpr tupleExpr;


    if (node.hasQueryBody()) {
      // Build tuple expression for query body
      tupleExpr = (TupleExpr)node.getQueryBody().jjtAccept(this, null);
    }
    else {
      tupleExpr = new SingletonSet();
    }


    // Create constructor
    ConstructorBuilder cb = new ConstructorBuilder();
    ASTConstruct constructNode = node.getConstructClause();


    if (!constructNode.isWildcard()) {
      TupleExpr constructExpr = (TupleExpr)constructNode.jjtAccept(this, null);
      tupleExpr = cb.buildConstructor(tupleExpr, constructExpr, constructNode.isDistinct());
    }
    else if (node.hasQueryBody()) {
      tupleExpr = cb.buildConstructor(tupleExpr, constructNode.isDistinct());
    }

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  @Override
  public CompareAny visit(ASTCompareAny node, Object data)
    throws VisitorException
  {
    ValueExpr valueExpr = (ValueExpr)node.getLeftOperand().jjtAccept(this, null);
    TupleExpr tupleExpr = (TupleExpr)node.getRightOperand().jjtAccept(this, null);
    CompareOp op = node.getOperator().getValue();


    return new CompareAny(valueExpr, tupleExpr, op);
  }

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  }


  public TupleExpr optimize(TupleExpr expr, Dataset dataset, BindingSet bindings, EvaluationStrategy strategy)
  {
    // Clone the tuple expression to allow for more aggressive optimisations
    TupleExpr tupleExpr = expr.clone();


    if (!(tupleExpr instanceof QueryRoot)) {
      // Add a dummy root node to the tuple expressions to allow the
      // optimisers to modify the actual root node
      tupleExpr = new QueryRoot(tupleExpr);

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  protected CloseableIteration<BindingSet, QueryEvaluationException> evaluateInternal(
      TupleExpr expr, Dataset dataset, BindingSet bindings,
      boolean includeInferred) throws SailException {
    triples.flush();
    try {
      TupleExpr tupleExpr;
      EvaluationStrategy strategy;
      strategy = factory.createRdbmsEvaluation(dataset);
      tupleExpr = optimizer.optimize(expr, dataset, bindings, strategy);
      return strategy.evaluate(tupleExpr, bindings);
    } catch (QueryEvaluationException e) {

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Related Classes of org.openrdf.query.algebra.TupleExpr

edu.mit.simile.backstage.model.data.Expression

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.EvaluationStrategyImpl

org.openrdf.query.algebra.evaluation.impl.QueryJoinOptimizer$JoinVisitor

org.openrdf.query.algebra.evaluation.impl.QueryModelPruner$TreeSanitizer

org.openrdf.query.algebra.evaluation.impl.SameTermFilterOptimizer$SameTermFilterVisitor

org.openrdf.query.parser.serql.ConstructorBuilder

org.openrdf.query.parser.serql.GraphPattern

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