private void CompleteSelectionSet(CompilerContext context)
{
foreach (Selection selection in context.Fields.Values)
{
// we now mark the selection read-only and add it to the final selection-set.
selection.MakeReadOnly();
context.Selections.Add(selection);
// if one selection of a selection-set is conditional,
// then the whole set is conditional and has to be post processed during execution.
if (!context.IsConditional && (selection.IsConditional || selection.IsInternal))
{
context.IsConditional = true;
}
// if the field of the selection returns a composite type we will traverse
// the child selection-sets as well.
INamedType fieldType = selection.Field.Type.NamedType();
if (fieldType.IsCompositeType())
{
if (selection.SelectionSet is null)
{
// composite fields always have to have a selection-set
// otherwise we need to throw.
throw QueryCompiler_CompositeTypeSelectionSet(selection.SyntaxNode);
}
IReadOnlyList <ObjectType> possibleTypes = _schema.GetPossibleTypes(fieldType);
for (var i = possibleTypes.Count - 1; i >= 0; i--)
{
// we branch the context which will enqueue the new context
// to the work backlog.
context.TryBranch(possibleTypes[i], selection);
}
}
}
context.Complete();
}
