Examples of org.openrdf.query.algebra.Extension

org.openrdf.query.algebra.Extension
An extension operator that can be used to add bindings to solutions whose values are defined by {@link ValueExpr value expressions}.

        }
      }
    }


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


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

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  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()) {
      ValueExpr valueExpr = (ValueExpr)projElemNode.getValueExpr().jjtAccept(this, null);


      String alias = projElemNode.getAlias();
      if (alias != null) {
        // aliased projection element
        extension.addElement(new ExtensionElem(valueExpr, alias));
        projElemList.addElement(new ProjectionElem(alias));
      }
      else if (valueExpr instanceof Var) {
        // unaliased variable
        Var projVar = (Var)valueExpr;
        projElemList.addElement(new ProjectionElem(projVar.getName()));
      }
      else {
        throw new IllegalStateException("required alias for non-Var projection elements not found");
      }
    }


    if (!extension.getElements().isEmpty()) {
      extension.setArg(result);
      result = extension;
    }


    result = new Projection(result, projElemList);

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      filter.getArg().visit(new VarRenamer(oldVar.getName(), newVar.getName()));


      // TODO: skip this step if old variable name is not used
      // Replace SameTerm-filter with an Extension, the old variable name
      // might still be relevant to nodes higher in the tree
      Extension extension = new Extension(filter.getArg());
      extension.addElement(new ExtensionElem(new Var(newVar.getName()), oldVar.getName()));
      filter.replaceWith(extension);
    }

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        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> projList = new ArrayList<ProjectionElemList>();

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        }
      }
    }


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


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

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  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()) {
      ValueExpr valueExpr = (ValueExpr)projElemNode.getValueExpr().jjtAccept(this, null);


      String alias = projElemNode.getAlias();
      if (alias != null) {
        // aliased projection element
        extension.addElement(new ExtensionElem(valueExpr, alias));
        projElemList.addElement(new ProjectionElem(alias));
      }
      else if (valueExpr instanceof Var) {
        // unaliased variable
        Var projVar = (Var)valueExpr;
        projElemList.addElement(new ProjectionElem(projVar.getName()));
      }
      else {
        throw new IllegalStateException("required alias for non-Var projection elements not found");
      }
    }


    if (!extension.getElements().isEmpty()) {
      extension.setArg(result);
      result = extension;
    }


    result = new Projection(result, projElemList);

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    private void renameVar(Var oldVar, Var newVar, Filter filter) {
      filter.getArg().visit(new VarRenamer(oldVar.getName(), newVar.getName()));


      // Replace SameTerm-filter with an Extension, the old variable name
      // might still be relevant to nodes higher in the tree
      Extension extension = new Extension(filter.getArg());
      extension.addElement(new ExtensionElem(new Var(newVar.getName()), oldVar.getName()));
      filter.replaceWith(extension);
    }

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        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> projList = new ArrayList<ProjectionElemList>();

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

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

org.openrdf.query.parser.serql.ConstructorBuilder

org.openrdf.query.parser.serql.QueryModelBuilder

org.openrdf.query.parser.sparql.TupleExprBuilder

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