Package org.openrdf.query.algebra

Examples of org.openrdf.query.algebra.Projection

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        if (!var.isAnonymous() && !var.hasValue()) {
          projElemList.addElement(new ProjectionElem(var.getName()));
        }
      }

      result = new Projection(result, projElemList);

      // Filter the duplicates from these projected bindings
      result = new Distinct(result);
    }

    // Create BNodeGenerator's for all anonymous variables
    Map<Var, ExtensionElem> extElemMap = new HashMap<Var, ExtensionElem>();

    for (Var var : constructVars) {
      if (var.isAnonymous() && !extElemMap.containsKey(var)) {
        ValueExpr valueExpr = null;

        if (var.hasValue()) {
          valueExpr = new ValueConstant(var.getValue());
        }
        else if (explicit) {
          // only generate bnodes in case of an explicit constructor
          valueExpr = new BNodeGenerator();
        }

        if (valueExpr != null) {
          extElemMap.put(var, new ExtensionElem(valueExpr, var.getName()));
        }
      }
    }

    if (!extElemMap.isEmpty()) {
      result = new Extension(result, extElemMap.values());
    }

    // Create a Projection for each StatementPattern in the constructor
    List<ProjectionElemList> projections = new ArrayList<ProjectionElemList>();

    for (StatementPattern sp : statementPatterns) {
      ProjectionElemList projElemList = new ProjectionElemList();

      projElemList.addElement(new ProjectionElem(sp.getSubjectVar().getName(), "subject"));
      projElemList.addElement(new ProjectionElem(sp.getPredicateVar().getName(), "predicate"));
      projElemList.addElement(new ProjectionElem(sp.getObjectVar().getName(), "object"));

      projections.add(projElemList);
    }

    if (projections.size() == 1) {
      result = new Projection(result, projections.get(0));

      // Note: no need to apply the second duplicate elimination step if
      // there's just one projection
    }
    else if (projections.size() > 1) {
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    if (!extension.getElements().isEmpty()) {
      extension.setArg(result);
      result = extension;
    }

    result = new Projection(result, projElemList);

    if (node.isDistinct()) {
      result = new Distinct(result);
    }
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    for (int i = 0; i < node.jjtGetNumChildren(); i++) {
      Var projVar = (Var)node.jjtGetChild(i).jjtAccept(this, null);
      projElemList.addElement(new ProjectionElem(projVar.getName()));
    }

    result = new Projection(result, projElemList);

    if (node.isReduced()) {
      result = new Reduced(result);
    }
    if (node.isDistinct()) {
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      projList.add(projElemList);
    }

    if (projList.size() == 1) {
      result = new Projection(result, projList.get(0));
    }
    else if (projList.size() > 1) {
      result = new MultiProjection(result, projList);
    }
    else {
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    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"));
    result = new Projection(result, projElemList);

    return new Reduced(result);
  }
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                  ProjectionElemList projectionElements = new ProjectionElemList();
                  projectionElements.addElement(new ProjectionElem(_valueVar.getName()));
                  projectionElements.addElement(new ProjectionElem(_countVar.getName()));
                 
                  Projection projection = new Projection(group, projectionElements);
                  Order order = "value".equals(_sortMode) ?
                      new Order(projection, new OrderElem(_valueVar, "forward".equals(_sortDirection))) :
                      new Order(projection, new OrderElem(_countVar, !"forward".equals(_sortDirection)));
                 
                  TupleQuery query = new MyTupleQuery(new ParsedTupleQuery(order), connection);
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    public Projection makeProjection(Var var) {
        return makeProjection(new ProjectionElemList(new ProjectionElem(var.getName())));
    }
   
    public Projection makeProjection(ProjectionElemList projectionElements) {
        return new Projection(
            makeFilterTupleExpr(),
            projectionElements
        );
    }
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            if (t == null) {
              // TODO[dfhuynh]: This happens if the expression is just "value". I'm not sure what to do here.
              return null;
            }
           
            Projection projection = new Projection(t, projectionElements);
            TupleQuery query = new MyTupleQuery(new ParsedTupleQuery(projection), connection);
           
            return new ExpressionQueryResult(query, expressionResult.valueType, resultVar);
        }
        return null;
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        if (!var.isAnonymous() && !var.hasValue()) {
          projElemList.addElement(new ProjectionElem(var.getName()));
        }
      }

      result = new Projection(result, projElemList);

      // Filter the duplicates from these projected bindings
      result = new Distinct(result);
    }

    // Create BNodeGenerator's for all anonymous variables
    Map<Var, ExtensionElem> extElemMap = new HashMap<Var, ExtensionElem>();

    for (Var var : constructVars) {
      if (var.isAnonymous() && !extElemMap.containsKey(var)) {
        ValueExpr valueExpr = null;

        if (var.hasValue()) {
          valueExpr = new ValueConstant(var.getValue());
        }
        else if (explicit) {
          // only generate bnodes in case of an explicit constructor
          valueExpr = new BNodeGenerator();
        }

        if (valueExpr != null) {
          extElemMap.put(var, new ExtensionElem(valueExpr, var.getName()));
        }
      }
    }

    if (!extElemMap.isEmpty()) {
      result = new Extension(result, extElemMap.values());
    }

    // Create a Projection for each StatementPattern in the constructor
    List<ProjectionElemList> projections = new ArrayList<ProjectionElemList>();

    for (StatementPattern sp : statementPatterns) {
      ProjectionElemList projElemList = new ProjectionElemList();

      projElemList.addElement(new ProjectionElem(sp.getSubjectVar().getName(), "subject"));
      projElemList.addElement(new ProjectionElem(sp.getPredicateVar().getName(), "predicate"));
      projElemList.addElement(new ProjectionElem(sp.getObjectVar().getName(), "object"));

      projections.add(projElemList);
    }

    if (projections.size() == 1) {
      result = new Projection(result, projections.get(0));

      // Note: no need to apply the second duplicate elimination step if
      // there's just one projection
    }
    else if (projections.size() > 1) {
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    if (!extension.getElements().isEmpty()) {
      extension.setArg(result);
      result = extension;
    }

    result = new Projection(result, projElemList);

    if (node.isDistinct()) {
      result = new Distinct(result);
    }
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Related Classes of org.openrdf.query.algebra.Projection

  • edu.mit.simile.backstage.model.data.Expression
  • edu.mit.simile.backstage.model.TupleQueryBuilder
  • edu.mit.simile.backstage.model.ui.facets.ListFacet$ListFacetCacheableQuery
  • org.openrdf.query.parser.serql.ConstructorBuilder
  • org.openrdf.query.parser.serql.QueryModelBuilder
  • org.openrdf.query.parser.sparql.TupleExprBuilder
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