Package com.hp.hpl.jena.sparql.core

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

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{
    public static void main (String[] argv)
    {
        String BASE = "http://example/" ;
        BasicPattern bp = new BasicPattern() ;
        Var var_x = Var.alloc("x") ;
        Var var_z = Var.alloc("z") ;
       
        // ---- Build expression
        bp.add(new Triple(var_x, Node.createURI(BASE+"p"), var_z)) ;
        Op op = new OpBGP(bp) ;
        //Expr expr = ExprUtils.parse("?z < 2 ") ;
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        // See also ExProg1
       
        ElementGroup elg = new ElementGroup() ;
       
        Var varTitle = Var.alloc("title") ;
        Var varX = Var.alloc("x") ;
       
        Triple t1 = new Triple(varX, DC.title.asNode(),  varTitle) ;
        elg.addTriplePattern(t1) ;
       
        // Adds a filter.  Need to wrap variable in a NodeVar.
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        // Build pattern
       
        ElementGroup elg = new ElementGroup() ;
       
        Var varTitle = Var.alloc("title") ;
        Var varX = Var.alloc("x") ;
       
        Triple t1 = new Triple(varX, DC.title.asNode(),  varTitle) ;
        elg.addTriplePattern(t1) ;
       
        // Don't use bNodes for anon variables.  The conversion is done in parsing.
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            // Old (ARQ 1) way - not recommended.
            return buildSyntax(input, nodeVar, pattern, execCxt) ;
       
        // Better
        // Build a SPARQL algebra expression
        Var var2 = createNewVar() ;                     // Hidden variable
       
        BasicPattern bp = new BasicPattern() ;
        Triple t = new Triple(nodeVar, RDFS.label.asNode(), var2) ;
        bp.add(t) ;
        OpBGP op = new OpBGP(bp) ;
       
        Expr regex = new E_Regex(new ExprVar(var2.getName()), pattern, "i") ;
        Op filter = OpFilter.filter(regex, op) ;

        // ---- Evaluation
        if ( true )
        {
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    // Build SPARQL syntax and compile it.
    // Not recommended.
    private QueryIterator buildSyntax(QueryIterator input, Node nodeVar, String pattern, ExecutionContext execCxt)
    {
        Var var2 = createNewVar() ;
        // Triple patterns for   ?x rdfs:label ?hiddenVar
        ElementTriplesBlock elementBGP = new ElementTriplesBlock();
        Triple t = new Triple(nodeVar, RDFS.label.asNode(), var2) ;
        elementBGP.addTriple(t) ;
       
        // Regular expression for  regex(?hiddenVar, "pattern", "i")
        Expr regex = new E_Regex(new ExprVar(var2.getName()), pattern, "i") ;
       
        ElementGroup elementGroup = new ElementGroup() ;
        elementGroup.addElement(elementBGP) ;
        elementGroup.addElement(new ElementFilter(regex)) ;
        // Compile it.
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            // Aggregators are broken up in the algebra, split between a
            // group and an assignment (extend or assign) using a generated var.
            // We record them here and insert later.
            for (ExprAggregator ea : a) {
                // Substitute generated var for actual
                Var givenVar = ea.getAggVar().asVar();
                // Copy aggregator across (?)
                Expr myAggr = query.allocAggregate(ea.getAggregator());
                varExpression.put(givenVar, myAggr);
            }
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            //And the aggregators...
            aggs2 = new ArrayList<ExprAggregator>() ;
            for ( ExprAggregator agg : aggs )
            {
                Aggregator aggregator = agg.getAggregator() ;
                Var v = agg.getVar() ;
               
                // Variable associated with the aggregate
                Expr eVar = agg.getAggVar() ;   // Not .getExprVar()
                Expr eVar2 = ExprTransformer.transform(exprTransform, eVar) ;
                if ( eVar != eVar2 )
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        ExprFunction2 eq = (ExprFunction2)e ;
        Expr left = eq.getArg1() ;
        Expr right = eq.getArg2() ;

        Var var = null ;
        NodeValue constant = null ;

        if ( left.isVariable() && right.isConstant() )
        {
            var = left.asVar() ;
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        List<Var> vars = v.projectVars;
        query.setQueryResultStar(vars.isEmpty()); // SELECT * unless we are projecting
        Iterator<Var> iter = vars.iterator();
        for (; iter.hasNext();) {
            Var var = iter.next();
            if (v.varExpression.containsKey(var))
                query.addResultVar(var, v.varExpression.get(var));
            else
                query.addResultVar(var);
        }
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            while( ! lookingAt(TokenType.DOT) )
            {
                if ( i >= vars.size() )
                    exception(peekToken(), "Too many items in a line.  Expected "+vars.size()) ;
               
                Var v = vars.get(i) ;
               
                Token token = nextToken() ;
                if ( ! token.hasType(TokenType.MINUS ) )
                {
                    Node n ;
                    // One case; VARS line then *
                    if ( token.hasType(TokenType.STAR ) || ( token.isCtlCode() && token.getCntrlCode() == -1 ) )
                        n = lastLine.get(v) ;
                    else if ( token.hasType(TokenType.BNODE) )
                        n = Node.createAnon(new AnonId(NodeFmtLib.decodeBNodeLabel(token.getImage()))) ;
                    else
                        n = profile.create(null, token) ;
                    binding.add(v, n) ;
                }
                i++ ;
            }
            if ( eof() )
                exception(peekToken(), "Line does not end with a DOT") ;
           
            Token dot = nextToken() ;
           
            if ( i != vars.size() )
            {
                Var v = vars.get(vars.size()-1) ;
                exception(dot, "Too many items in a line.  Expected "+vars.size()) ;
            }
            lastLine = binding ;
            return binding ;
        }
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Related Classes of com.hp.hpl.jena.sparql.core.Var

  • arq.examples.AlgebraExec
  • arq.examples.ExProg1
  • arq.examples.ExProg2
  • arq.examples.propertyfunction.labelSearch
  • com.clarkparsia.pellet.sparqldl.jena.SparqlDLResultSet
  • com.clarkparsia.pellet.sparqldl.jena.SparqlDLStage$PelletQueryIterator
  • com.clarkparsia.pellet.test.query.TestMiscSPARQL
  • com.hp.hpl.jena.graph.Node
  • com.hp.hpl.jena.sdb.compiler.TransformSDB
  • com.hp.hpl.jena.sdb.core.sqlnode.SqlSelectBlock
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