Package com.hp.hpl.jena.sparql.algebra.op

Examples of com.hp.hpl.jena.sparql.algebra.op.OpProject

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public class TransformOrderByDistinctApplication extends TransformCopy {

    @Override
    public Op transform(OpDistinct opDistinct, Op subOp) {
        if (subOp instanceof OpProject) {
            OpProject project = (OpProject) subOp;
            // At the project stage everything is a simple variable
            // Inner operation must be an ORDER BY
            if (project.getSubOp() instanceof OpOrder) {
                List<Var> projectVars = project.getVars();
                OpOrder order = (OpOrder) project.getSubOp();

                // Everything we wish to order by must only use variables that
                // appear in the project list
                boolean ok = true;
                for (SortCondition condition : order.getConditions()) {
                    if (!isValidSortCondition(condition, projectVars)) {
                        ok = false;
                        break;
                    }
                }

                // Everything checks out so we can make the change
                if (ok) {
                    OpProject newProject = new OpProject(order.getSubOp(), project.getVars());
                    OpDistinct newDistinct = new OpDistinct(newProject);
                    return new OpOrder(newDistinct, order.getConditions());
                }
            }
        }
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    }

    @Override
    public Op transform(OpReduced opReduced, Op subOp) {
        if (subOp instanceof OpProject) {
            OpProject project = (OpProject) subOp;
            // At the project stage everything is a simple variable
            // Inner operation must be an ORDER BY
            if (project.getSubOp() instanceof OpOrder) {
                List<Var> projectVars = project.getVars();
                OpOrder order = (OpOrder) project.getSubOp();

                // Everything we wish to order by must only use variables that
                // appear in the project list
                boolean ok = true;
                for (SortCondition condition : order.getConditions()) {
                    if (!isValidSortCondition(condition, projectVars)) {
                        ok = false;
                        break;
                    }
                }

                // Everything checks out so we can make the change
                if (ok) {
                    OpProject newProject = new OpProject(order.getSubOp(), project.getVars());
                    Op newReduced = OpReduced.create(newProject);
                    return new OpOrder(newReduced, order.getConditions());
                }
            }
        }
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    // Best is this is after TransformTopN but they are order independent
    // TopN of "reduced or distinct of order" is handled.
    //@Override
    public Op transform1(OpDistinct opDistinct, Op subOp) {
        if (subOp instanceof OpProject) {
            OpProject opProject = (OpProject) subOp;
            if (opProject.getSubOp() instanceof OpOrder) {
                OpOrder opOrder = (OpOrder) opProject.getSubOp();
                Set<Var> projectVars = new HashSet<Var>(opProject.getVars()) ;
                if (isSafe(projectVars, opOrder)) {
                    return OpReduced.create(subOp);
                }
            }
        }
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         */
        if (subOp instanceof OpOrder) {
            opOrder = (OpOrder) subOp;
            projectVars = OpVars.visibleVars(subOp) ;
        } else if (subOp instanceof OpProject) {
            OpProject opProject = (OpProject) subOp;
            if (opProject.getSubOp() instanceof OpOrder) {
                projectVars = new HashSet<Var>(opProject.getVars()) ;
                opOrder = (OpOrder) opProject.getSubOp();
            }
        }

        if ( projectVars == null )
            return super.transform(opDistinct, subOp) ;
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public class TransformOrderByDistinctAppplication extends TransformCopy {

    @Override
    public Op transform(OpDistinct opDistinct, Op subOp) {
        if (subOp instanceof OpProject) {
            OpProject project = (OpProject) subOp;
            // At the project stage everything is a simple variable
            // Inner operation must be an ORDER BY
            if (project.getSubOp() instanceof OpOrder) {
                List<Var> projectVars = project.getVars();
                OpOrder order = (OpOrder) project.getSubOp();

                // Everything we wish to order by must only use variables that
                // appear in the project list
                boolean ok = true;
                for (SortCondition condition : order.getConditions()) {
                    if (!isValidSortCondition(condition, projectVars)) {
                        ok = false;
                        break;
                    }
                }

                // Everything checks out so we can make the change
                if (ok) {
                    OpProject newProject = new OpProject(order.getSubOp(), project.getVars());
                    OpDistinct newDistinct = new OpDistinct(newProject);
                    return new OpOrder(newDistinct, order.getConditions());
                }
            }
        }
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    }

    @Override
    public Op transform(OpReduced opReduced, Op subOp) {
        if (subOp instanceof OpProject) {
            OpProject project = (OpProject) subOp;
            // At the project stage everything is a simple variable
            // Inner operation must be an ORDER BY
            if (project.getSubOp() instanceof OpOrder) {
                List<Var> projectVars = project.getVars();
                OpOrder order = (OpOrder) project.getSubOp();

                // Everything we wish to order by must only use variables that
                // appear in the project list
                boolean ok = true;
                for (SortCondition condition : order.getConditions()) {
                    if (!isValidSortCondition(condition, projectVars)) {
                        ok = false;
                        break;
                    }
                }

                // Everything checks out so we can make the change
                if (ok) {
                    OpProject newProject = new OpProject(order.getSubOp(), project.getVars());
                    Op newReduced = OpReduced.create(newProject);
                    return new OpOrder(newReduced, order.getConditions());
                }
            }
        }
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    @Override
    public Op transform(OpDistinct opDistinct, Op subOp) {
        if (subOp instanceof OpOrder) {
            return OpReduced.create(subOp);
        } else if (subOp instanceof OpProject) {
            OpProject project = (OpProject) subOp;
            if (project.getSubOp() instanceof OpOrder) {
                return OpReduced.create(subOp);
            }
        }
        return super.transform(opDistinct, subOp);
    }
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        {
            // Third case: slice-project-order
            Op subSubOp = ((Op1)subOp).getSubOp() ;
            if ( subSubOp instanceof OpOrder )
            {
                OpProject opProject = (OpProject)subOp ;
                OpOrder opOrder = (OpOrder)subSubOp ;
                // NB leave project over topN, unlike the distinct case where distinct goes under topN.
                OpTopN opTopN = new OpTopN( opOrder.getSubOp(), (int)(offset+opSlice.getLength()), opOrder.getConditions() ) ;
                Op proj = new OpProject(opTopN, opProject.getVars()) ;
                if ( offset == 0 ) {
                    return proj ;
                } else {
                    return new OpSlice( proj, offset, Query.NOLIMIT ) ;                      
                }
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            // Put back project - as an OpProject to leave for the bridge.
            OpSQL x = new OpSQL(n, opProject, request) ;
            x.setBridge(opSQL.getBridge()) ;
            // Bridge will be set later.
            // Is OpProject needed?
            return new OpProject(x, pv) ;
        }
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        // ---- PROJECT
        // No projection => initial variables are exposed.
        // Needed for CONSTRUCT and initial bindings + SELECT *
       
        if ( vars.size() > 0 )
            op = new OpProject(op, vars) ;
       
        // ---- DISTINCT
        if ( query.isDistinct() )
            op = OpDistinct.create(op) ;
       
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Related Classes of com.hp.hpl.jena.sparql.algebra.op.OpProject

  • com.hp.hpl.jena.sdb.compiler.QueryCompilerMain$LimitOffsetOptimizer
  • com.hp.hpl.jena.sdb.compiler.TransformSliceProject
  • com.hp.hpl.jena.sparql.algebra.AlgebraGenerator
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformDistinctToReduced
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformOrderByDistinctApplication
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformOrderByDistinctAppplication
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformTopN
  • com.hp.hpl.jena.sparql.graph.NodeTransformOp
  • org.apache.jena.security.query.rewriter.OpRewriter
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