Examples of com.hp.hpl.jena.sparql.expr.Expr

com.hp.hpl.jena.sparql.expr.Expr

        
        for ( Iterator<Var> iter = exprList.getVars().iterator() ; iter.hasNext() ; )
        {
            // In scope?
            Var v = iter.next();
            Expr e = exprList.getExpr(v) ;
            checkAssignment(vars2, e, v) ;
            vars2.add(v) ;
        }
    }

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            for ( Iterator<Var> iter = exprList.getVars().iterator() ; iter.hasNext() ; )
            {
                // In scope?
                Var v = iter.next();
                Expr e = exprList.getExpr(v) ;
                if ( e == null )
                {
                    if ( ! groupVars.contains(v) )
                        throw new QueryParseException("Non-group key variable in SELECT: "+v, -1 , -1) ;
                }
                else
                {
                    Set<Var> eVars = e.getVarsMentioned() ;
                    for ( Var v2 : eVars )
                    {
                        if ( ! groupVars.contains(v2) )
                            throw new QueryParseException("Non-group key variable in SELECT: "+v2+" in expression "+e , -1 , -1) ;
                    }

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        StringBuilder sb = new StringBuilder() ;
        boolean first = true ;
        for ( Iterator<Var> iter = exprList.getVars().iterator() ; iter.hasNext() ; )
        {
            Var v = iter.next();
            Expr e = exprList.getExpr(v) ;
            if ( ! first )
                sb.append(" ") ;
            first = false ;
            sb.append("(").append(e).append(" AS ").append(v).append(")") ;
        }

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    void appendNamedExprList(Query query, IndentedWriter sb, VarExprList namedExprs)
    {
        boolean first = true ;
        for ( Var var : namedExprs.getVars() )
        {
            Expr expr = namedExprs.getExpr(var) ;
            if ( ! first )
                sb.print(" ") ;
            
            if ( expr != null ) 
            {
                // The following are safe to write without () 
                // Compare/merge with fmtExpr.format
                boolean needParens = true ; 
                
                if ( expr.isFunction() )
                    needParens = false ;
//                else if ( expr instanceof E_Aggregator )
//                    // Aggregators are variables (the function maps to an internal variable 
//                    // that is accesses by the E_Aggregator
//                    needParens = false ;
                else if ( expr.isVariable() )
                    needParens = false ;
                
                if ( ! Var.isAllocVar(var) )
                    // AS ==> need parens
                    needParens = true  ;

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    {
        try {
            Reader in = new StringReader(s) ;
            ARQParser parser = new ARQParser(in) ;
            parser.setQuery(query) ;
            Expr expr = parser.Expression() ;
            
            if ( checkAllUsed )
            {
                Token t = parser.getNextToken() ;
                if ( t.kind != ARQParserTokenManager.EOF )

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    public static void expr(String exprStr) { expr(exprStr, null) ; }
    public static void expr(String exprStr, Binding binding)
    {
        try {
            Expr expr = ExprUtils.parse(exprStr, ARQConstants.getGlobalPrefixMap()) ;
            evalPrint(expr, binding) ;
        }
        catch (QueryParseException ex)
        {
            System.err.println("Parse error: "+ex.getMessage()) ;

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    }
    
    public static void exprPrefix(String string, Binding binding)
    {
        try {
            Expr expr = SSE.parseExpr(string) ;
            evalPrint(expr, binding) ;
        }
        catch (SSEParseException ex)
        {
            System.err.println("Parse error: "+ex.getMessage()) ;

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    @Override
    public void visit(ElementFilter el)
    {
        out.print("FILTER ") ;
        Expr expr = el.getExpr() ;
        FmtExpr v = new FmtExpr(out, context) ;
        
        // This assumes that complex expressions are bracketted
        // (parens) as necessary except for some cases:
        //   Plain variable or constant
        
        boolean addParens = false ;
        if ( expr.isVariable() )
            addParens = true ;
        if ( expr.isConstant() )
            addParens = true ;
        
        if ( addParens )
            out.print("( ") ;
        v.format(expr) ;

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            out.print(n) ;


            out.incIndent() ;
            for ( int i = 1 ; ; i++ )
            {
                Expr expr = func.getArg(i) ;
                if ( expr == null )
                    break ; 
                // endLine() ;
                out.print(' ') ;
                expr.visit(this) ;
            }
            out.print(")") ;
            out.decIndent() ;
        }

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        {
            ExprList ex = new ExprList() ;
            boolean changed = false ;
            for ( Expr e : opFilter.getExprs() )
            {
                Expr e2 = ExprTransformer.transform(exprTransform, e) ;
                ex.add(e2) ;
                if ( e != e2 )
                    changed = true ;
            }
            OpFilter f = opFilter ;

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