Package com.hp.hpl.jena.sparql.expr

Examples of com.hp.hpl.jena.sparql.expr.Expr.eval()

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        Expr expr = exprs.get(var) ;
        if ( expr == null )
            return binding.get(var) ;
       
        try {
            NodeValue nv = expr.eval(binding, funcEnv) ;
            if ( nv == null )
                return null ;
            return nv.asNode() ;
        } catch (ExprEvalException ex)
        //{ Log.warn(this, "Eval failure "+expr+": "+ex.getMessage()) ; }
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            Expr e2 = null ;
            if ( args.size() == 3 )
                e2 = args.get(2) ;

            String pattern = e1.eval(binding, env).getString() ;
            String flags = (e2==null)?null : e2.eval(binding, env).getString() ;
           
            regexEval = new E_Regex(expr, pattern, flags) ;

            // Cache if the pattern is fixed and the flags are fixed or non-existant
            if ( e1 instanceof NodeValue && ( e2 == null || e2 instanceof NodeValue ) )
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        if ( args.size() != 1 )
            throw new ARQInternalErrorException("function eval: Arg list not of size 1") ;
       
        Expr ex = args.get(0) ;
        try {
            NodeValue v = ex.eval(binding, env) ;
            return v ;
        } catch (ExprEvalException evalEx)
        {
            return NodeValue.FALSE ;
        }
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    private static PrefixMapping pmap = ARQConstants.getGlobalPrefixMap() ;
   
    private static void test(String string, String result)
    {
        Expr expr = ExprUtils.parse(string, pmap) ;
        NodeValue nv = expr.eval(null, new FunctionEnvBase()) ;
        Node r = NodeFactory.parseNode(result) ;
        NodeValue nvr = NodeValue.makeNode(r) ;
       
        assertTrue("Not same value: Expected: "+nvr+" : Actual = "+nv, NodeValue.sameAs(nvr, nv)) ; 
        // test result must be lexical form exact.
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        UserDefinedFunction f = (UserDefinedFunction) UserDefinedFunctionFactory.getFactory().create("http://example/cube");
        f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
       
        Expr actual = f.getActualExpr();
        NodeValue result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
        Assert.assertEquals(8, NodeFactory.nodeToInt(result.asNode()));
       
        //Change the definition of the function we depend on
        //This has no effect with preserveDependencies set to false (the default) since we fully expanded the call to the dependent
        //function when our outer function was defined
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        square = new ExprVar("x");
        UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<Var>(square.getVarsMentioned()));
        f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
       
        actual = f.getActualExpr();
        result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
        Assert.assertEquals(8, NodeFactory.nodeToInt(result.asNode()));
    }
   
    @Test(expected=ExprBuildException.class)
    public void test_function_expansion_bad_01() {
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        UserDefinedFunction f = (UserDefinedFunction) UserDefinedFunctionFactory.getFactory().create("http://example/cube");
        f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
       
        Expr actual = f.getActualExpr();
        NodeValue result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
        Assert.assertEquals(8, NodeFactory.nodeToInt(result.asNode()));
       
        //Change the definition of the function we depend on
        square = new ExprVar("x");
        UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<Var>(square.getVarsMentioned()));
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        square = new ExprVar("x");
        UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<Var>(square.getVarsMentioned()));
        f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
       
        actual = f.getActualExpr();
        result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
        Assert.assertEquals(4, NodeFactory.nodeToInt(result.asNode()));
    }
}
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    private static PrefixMapping pmap = ARQConstants.getGlobalPrefixMap() ;
   
    private static void test(String string, String result)
    {
        Expr expr = ExprUtils.parse(string, pmap) ;
        NodeValue nv = expr.eval(null, new FunctionEnvBase()) ;
        Node r = NodeFactory.parseNode(result) ;
        NodeValue nvr = NodeValue.makeNode(r) ;
       
        assertTrue("Not same value: Expected: "+nvr+" : Actual = "+nv, NodeValue.sameAs(nvr, nv)) ; 
        // test result must be lexical form exact.
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