/// <summary>
/// Evaluates Prefix expression
/// </summary>
/// <param name="m">method call expression</param>
private void VisitPrefix(MethodCallExpression m)
{
string prefix = (string)((ConstantExpression)m.Arguments[1]).Value;
string iri = (string)((ConstantExpression)m.Arguments[2]).Value;
Prefixes.Add(SPARQL.Prefix(prefix, iri));
}
public void TestToString1()
{
var prefixes = new[] {
SPARQL.Prefix("p1", "http://test.com/p1"),
SPARQL.Prefix("p2", "http://test.com/p2"),
};
var source = TestDataProvider.GetQuerable <dynamic>("", prefixes: prefixes);
var query = source.Prefix("p3", "http://test.com/p3")
.Prefix("p4", "http://test.com/p4")
.Prefix("p5", "http://test.com/p5");
var resStr = query.ToString();
resStr.Should().StartWith(
@"PREFIX p1: <http://test.com/p1>
PREFIX p2: <http://test.com/p2>
PREFIX p3: <http://test.com/p3>
PREFIX p4: <http://test.com/p4>
PREFIX p5: <http://test.com/p5>"
);
}
/// <summary>
/// Makes triple from expression arguments
/// </summary>
/// <param name="m">method call arguments</param>
/// <returns></returns>
private Triple MakeTripleFromArguments(MethodCallExpression m)
{
return(SPARQL.Triple((string)((ConstantExpression)m.Arguments[1]).Value,
new List <string>()
{
string.Concat((string)((ConstantExpression)m.Arguments[2]).Value, " ", ((ConstantExpression)m.Arguments[3]).Value.ToString())
}));
}
/// <summary>
/// Evaluates Group expression
/// </summary>
/// <param name="m">method call expression</param>
/// <returns>SPARQL Where clause item</returns>
private IWhereItem VisitGroup(MethodCallExpression m)
{
var group = new Group(
SPARQL.Triple((string)((ConstantExpression)m.Arguments[1]).Value,
new List <string>()
{
string.Concat((string)((ConstantExpression)m.Arguments[2]).Value, " ", (string)((ConstantExpression)m.Arguments[3]).Value)
})
);
return(group);
}
/// <summary>
/// Evaluates Either expression
/// </summary>
/// <param name="m">method call expression</param>
/// <returns>SPARQL Where clause item</returns>
private IWhereItem VisitEither(MethodCallExpression m)
{
var union = new Union(
new Group(
SPARQL.Triple((string)((ConstantExpression)m.Arguments[1]).Value,
new List <string>()
{
string.Concat((string)((ConstantExpression)m.Arguments[2]).Value, " ", (string)((ConstantExpression)m.Arguments[3]).Value)
})
),
null
);
return(union);
}
private IWhereItem VisitBindAs(MethodCallExpression bind, MethodCallExpression asValue)
{
return(SPARQL.Bind(string.Concat((string)((ConstantExpression)bind.Arguments[1]).Value,
" AS ",
(string)((ConstantExpression)asValue.Arguments[1]).Value)));
}
/// <summary>
/// Evaluates FilterBy expression
/// </summary>
/// <param name="m">method call expression</param>
/// <returns>SPARQL Where clause item</returns>
private IWhereItem VisitFilterBy(MethodCallExpression m)
{
var filter = SPARQL.Filter((string)((ConstantExpression)m.Arguments[1]).Value);
return(filter);
}
