public static void GetSparqlExpression(Expression expression, SparqlQueryBuilder queryBuilder)
{
var visitor = new SparqlGeneratorSelectExpressionTreeVisitor(queryBuilder);
var resultExpression = visitor.VisitExpression(expression);
if (resultExpression is SelectIdentifierVariableNameExpression)
{
var selectId = resultExpression as SelectIdentifierVariableNameExpression;
var selectVar = queryBuilder.NextVariable();
queryBuilder.AddBindExpression("STRAFTER(STR(?" + selectId.Name + "), " + SparqlQueryBuilder.QuoteLiteralString(selectId.IdentifierPrefix) + ")", selectVar);
queryBuilder.AddSelectVariable(selectVar);
}
else if (resultExpression is SelectVariableNameExpression)
{
queryBuilder.AddSelectVariable((resultExpression as SelectVariableNameExpression).Name);
}
}
public static void GetSparqlExpression(Expression expression, SparqlQueryBuilder queryBuilder)
{
var visitor = new SparqlGeneratorSelectExpressionTreeVisitor(queryBuilder);
var resultExpression = visitor.VisitExpression(expression);
if (resultExpression is SelectVariableNameExpression)
{
queryBuilder.AddSelectVariable((resultExpression as SelectVariableNameExpression).Name);
}
}
protected override Expression VisitMemberInitExpression(MemberInitExpression expression)
{
_queryBuilder.MemberInitExpression = expression;
_queryBuilder.Constructor = expression.NewExpression.Constructor;
foreach (var a in expression.NewExpression.Arguments)
{
var mappedExpression = VisitExpression(a);
if (mappedExpression is SelectVariableNameExpression)
{
_queryBuilder.ConstructorArgs.Add((mappedExpression as SelectVariableNameExpression).Name);
_queryBuilder.AddSelectVariable((mappedExpression as SelectVariableNameExpression).Name);
}
else
{
throw new NotSupportedException(
String.Format(
"Unable to map constructor expression to a SPARQL results variable. Only simple property expressions are currently supported. Invalid expression is: {0}",
a));
}
}
var updatedBindings = new List <MemberBinding>();
foreach (var b in expression.Bindings)
{
updatedBindings.Add(VisitMemberBinding(b));
}
#if WINDOWS_PHONE || PORTABLE
var updatedExpression = Expression.MemberInit(expression.NewExpression, updatedBindings);
#else
var updatedExpression = expression.Update(expression.NewExpression, updatedBindings);
#endif
_queryBuilder.MemberInitExpression = updatedExpression;
return(updatedExpression);
}
