/// <summary>
/// Inspects a query, ensuring it won't leak records and calculating the
/// records and fields it uses.
/// </summary>
public RecordsAndFields InspectExpression(LambdaExpression node)
{
_RecordsAndFields = new RecordsAndFields();
//first see if the node leaks any records:
EnsureTypeWontLeakRecords(node.ReturnType);
//visit the tree
Visit(node);
return(_RecordsAndFields);
}
private static RecordsAndFields VisitList <T>(ReadOnlyCollection <T> original, Func <T, RecordsAndFields> op)
{
RecordsAndFields @new = new RecordsAndFields();
for (int i = 0, n = original.Count; i < n; i++)
{
@new += op(original[i]);
}
return(@new);
}
public static RecordsAndFields operator +(RecordsAndFields first, RecordsAndFields second)
{
var allTypes = new HashSet <Type>(first.Types);
allTypes.UnionWith(second.Types);
var rnf = new RecordsAndFields();
foreach (var type in allTypes)
{
rnf.AddType(type);
rnf.AddFields(type, first.GetFieldsForType(type));
rnf.AddFields(type, second.GetFieldsForType(type));
}
return(rnf);
}
