private static Func <string, T> ProjectNew <T>(NewExpression nex, QueryParts parts, SubqueryParts subquery)
{
var results = new Dictionary <Expression, Func <object, object> >();
var list = new List <Func <object, object> >();
foreach (var s in subquery.Selects)
{
var factory = QuerySourceConverterFactory.CreateResult(s.Name, s.ItemType, s.QuerySource, parts);
if (s.Expression == null)
{
throw new FrameworkException("Null expression!?");
}
results[s.Expression] = factory.Instancer;
list.Add(factory.Instancer);
}
var arguments = new object[nex.Arguments.Count];
Func <string, T> result = value =>
{
if (value == null)
{
return(default(T));
}
var items = PostgresRecordConverter.ParseRecord(value);
for (int i = 0; i < items.Length; i++)
{
arguments[i] = list[i](items[i]);
}
return((T)nex.Constructor.Invoke(arguments));
};
return(result);
}
public static SelectSubqueryData Create(QueryParts parts, SubqueryParts subquery)
{
Contract.Requires(parts != null);
Contract.Requires(subquery != null);
var selects = new List <KeyValuePair <IQuerySource, Func <object, object> > >();
foreach (var s in subquery.Selects)
{
var factory = QuerySourceConverterFactory.Create(s.QuerySource, parts);
selects.Add(new KeyValuePair <IQuerySource, Func <object, object> >(factory.QuerySource, factory.Instancer));
}
return(new SelectSubqueryData(selects));
}