Examples of com.hp.hpl.jena.sparql.core.BasicPattern

com.hp.hpl.jena.sparql.core.BasicPattern
A class whose purpose is to give a name to a collection of triples. Reduces the use of bland "List" in APIs (Java 1.4)

    }


    // ---- All the cases


    protected QueryIterator execute(OpBGP opBGP, QueryIterator input) {
        BasicPattern pattern = opBGP.getPattern() ;
        QueryIterator qIter = stageGenerator.execute(pattern, input, execCxt) ;
        if (hideBNodeVars)
            qIter = new QueryIterDistinguishedVars(qIter, execCxt) ;
        return qIter ;
    }

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        }


        for (Triple triple : pattern) {
            OpQuadPattern opQuad = getQuads(op);
            if (opQuad == null) {
                opQuad = new OpQuadPattern(graphNode, new BasicPattern());
                op = OpSequence.create(op, opQuad);
            }


            opQuad.getBasicPattern().add(triple);
            // Update variables in scope.

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        return OpFilter.filter(exprList2, subOp) ;
    }        
    
    @Override public Op transform(OpBGP opBGP)
    { 
        BasicPattern bgp2 = NodeTransformLib.transform(transform, opBGP.getPattern()) ;
        if ( bgp2 == opBGP.getPattern())
            return super.transform(opBGP) ;
        return new OpBGP(bgp2) ;
    }

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    }
    
    @Override public Op transform(OpQuadPattern opQuadPattern)
    { 
        // The internal representation is (graph, BGP)
        BasicPattern bgp2 = NodeTransformLib.transform(transform, opQuadPattern.getBasicPattern()) ;
        Node g2 = opQuadPattern.getGraphNode() ;
        g2 = transform.convert(g2) ;
        
        if ( g2 == opQuadPattern.getGraphNode() && bgp2 == opQuadPattern.getBasicPattern() )
            return super.transform(opQuadPattern) ;

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    public static boolean isBGP(Op op)
    {
        return (op instanceof OpBGP ) ;
    }


    public OpBGP() { this(new BasicPattern()) ; }

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    //        DatasetGraph dg = execCxt.getDataset() ;
    //        if ( ! ( dg instanceof DatasetGraphTDB ) )
    //            throw new InternalErrorException("Not a TDB backed dataset in quad pattern execution") ;
        
        DatasetGraphTDB ds = (DatasetGraphTDB)execCxt.getDataset() ;
        BasicPattern bgp = quadPattern.getBasicPattern() ;
        Node gn = quadPattern.getGraphNode() ;
        return optimizeExecuteQuads(ds, input, gn, bgp, null, execCxt) ;
    }

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            // substituted as part of evaluation.
            
            if ( ! peek.hasNext() )
                throw new ARQInternalErrorException("Peek iterator is already empty") ;
 
            BasicPattern pattern2 = Substitute.substitute(pattern, peek.peek() ) ;
            // Calculate the reordering based on the substituted pattern.
            ReorderProc proc = transform.reorderIndexes(pattern2) ;
            // Then reorder original patten
            pattern = proc.reorder(pattern) ;
        }

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        {
            Graph g = execCxt.getActiveGraph() ;
            
            if ( g instanceof GraphTDB )
            {
                BasicPattern bgp = opBGP.getPattern() ;
                Explain.explain("Execute", bgp, execCxt.getContext()) ;
                // Triple-backed (but may be named as explicit default graph).
                //return SolverLib.execute((GraphTDB)g, bgp, input, filter, execCxt) ;
                GraphTDB gtdb = (GraphTDB)g ;
                Node gn = decideGraphNode(gtdb.getGraphName(), execCxt) ;

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            if ( execCxt.getDataset() instanceof DatasetGraphTDB )
            {
                DatasetGraphTDB ds = (DatasetGraphTDB)execCxt.getDataset() ;
                Explain.explain("Execute", opQuadPattern.getPattern(), execCxt.getContext()) ;
                BasicPattern bgp = opQuadPattern.getBasicPattern() ;
                return SolverLib.execute(ds, gn, bgp, input, filter, execCxt) ;
            }
            // Maybe a TDB named graph inside a non-TDB dataset.
            Graph g = execCxt.getActiveGraph() ;
            if ( g instanceof GraphTDB )
            {
                // Triples graph from TDB (which is the default graph of the dataset),
                // used a named graph in a composite dataset.
                BasicPattern bgp = opQuadPattern.getBasicPattern() ;
                Explain.explain("Execute", bgp, execCxt.getContext()) ;
                // Don't pass in G -- gn may be different.
                return SolverLib.execute(((GraphTDB)g).getDSG(), gn, bgp, input, filter, execCxt) ;
            }
            Log.warn(this, "Non-DatasetGraphTDB passed to OpExecutorPlainTDB") ;

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            // List ...
            List<Node> list = args.getArgList() ;
            if ( list.size() == 0 )
                return RDF.Nodes.nil ;
            BasicPattern bgp = new BasicPattern() ;
            Node head = GraphList.listToTriples(list, bgp) ;
            currentGroup().addElement(process(bgp)) ;
            return head ;
        }

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