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

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

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            OpOrder opOrder = (OpOrder)subOp ;
            OpTopN opTopN = new OpTopN( opOrder.getSubOp(), (int)(offset+opSlice.getLength()), opOrder.getConditions() ) ;
            if ( offset == 0 ) {
                return opTopN ;
            } else {
                return new OpSlice( opTopN, offset, Query.NOLIMIT ) ;                 
            }
        }

        if ( subOp instanceof OpDistinct || subOp instanceof OpReduced )
        {
            // Second case: slice-distinct-order or slice-reduced-order
            Op subSubOp = ((Op1)subOp).getSubOp() ;
            if ( subSubOp instanceof OpOrder ) {
                OpOrder opOrder = (OpOrder)subSubOp ;
                Op opDistinct2 = OpDistinct.create(opOrder.getSubOp()) ;
                OpTopN opTopN = new OpTopN( opDistinct2, (int)(offset+opSlice.getLength()), opOrder.getConditions() ) ;
                if ( offset == 0 ) {
                    return opTopN ;
                } else {
                    return new OpSlice( opTopN, offset, Query.NOLIMIT ) ;                      
                }
            }
        }

        if ( subOp instanceof OpProject )
        {
            // 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 ) ;                      
                }
            }
        }

      // Pass through.
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        if ( query.isReduced() )
            op = OpReduced.create(op) ;
       
        // ---- LIMIT/OFFSET
        if ( query.hasLimit() || query.hasOffset() )
            op = new OpSlice(op, query.getOffset() /*start*/, query.getLimit()/*length*/) ;
       
        return op ;
    }
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        if ( subOp instanceof OpProject )
        {
            OpProject p = (OpProject)subOp ;
            Op sub = p.getSubOp() ;
           
            Op x = new OpSlice(sub, opSlice.getStart(), opSlice.getLength()) ;
            x = new OpProject(x, p.getVars()) ;
            return x ;
        }
       
        return super.transform(opSlice, subOp) ;
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            OpOrder opOrder = (OpOrder)subOp ;
            OpTopN opTopN = new OpTopN( opOrder.getSubOp(), (int)(offset+opSlice.getLength()), opOrder.getConditions() ) ;
            if ( offset == 0 ) {
                return opTopN ;
            } else {
                return new OpSlice( opTopN, offset, Query.NOLIMIT ) ;                 
            }
        }

        if ( subOp instanceof OpDistinct || subOp instanceof OpReduced )
        {
            // Second case: slice-distinct-order or slice-reduced-order
            Op subSubOp = ((Op1)subOp).getSubOp() ;
            if ( subSubOp instanceof OpOrder ) {
                OpOrder opOrder = (OpOrder)subSubOp ;
                Op opDistinct2 = OpDistinct.create(opOrder.getSubOp()) ;
                OpTopN opTopN = new OpTopN( opDistinct2, (int)(offset+opSlice.getLength()), opOrder.getConditions() ) ;
                if ( offset == 0 ) {
                    return opTopN ;
                } else {
                    return new OpSlice( opTopN, offset, Query.NOLIMIT ) ;                      
                }
            }
        }

        if ( subOp instanceof OpProject )
        {
            // 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 ) ;                      
                }
            }
        }

      // Pass through.
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Related Classes of com.hp.hpl.jena.sparql.algebra.op.OpSlice

  • com.hp.hpl.jena.sdb.compiler.TransformSliceProject
  • com.hp.hpl.jena.sparql.algebra.AlgebraGenerator
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformTopN
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