public IEnumerable <T> ExecuteMany <T>(QueryDescription query, ObjectBinder objectBinder)
{
var sourceElement = _store.Descendants().Where(x => IdMatches(x, query.From.StartId)).FirstOrDefault();
var direction = query.From.HierarchyScope;
var expression = new XElementCriteriaVisitor().Visit(query.Criteria);
var allMatches = _store.Descendants().Where(expression.Compile());
IEnumerable <XElement> results = Enumerable.Empty <XElement>();
switch (direction)
{
case HierarchyScope.AllOrNone:
results = _store.Descendants().Where(x => allMatches.Contains(x));
break;
case HierarchyScope.Ancestors:
results = sourceElement.Ancestors().Where(x => allMatches.Contains(x));
break;
case HierarchyScope.AncestorsOrSelf:
results = sourceElement.AncestorsAndSelf().Where(x => allMatches.Contains(x));
break;
case HierarchyScope.Descendents:
results = sourceElement.Descendants().Where(x => allMatches.Contains(x));
break;
case HierarchyScope.DescendentsOrSelf:
results = sourceElement.DescendantsAndSelf().Where(x => allMatches.Contains(x));
break;
case HierarchyScope.Parent:
results = new[] { sourceElement.Ancestors().Where(x => allMatches.Contains(x)).Last() };
break;
case HierarchyScope.Children:
results = sourceElement.Elements().Where(x => allMatches.Contains(x));
break;
}
switch (query.ResultFilter.ResultFilterType)
{
case ResultFilterType.Take:
results = results.Take(query.ResultFilter.SelectorArgument);
break;
}
if (typeof(T).IsAssignableFrom(query.ResultFilter.ResultType))
{
return(results.Select(xElement => objectBinder.Execute(_fieldBinderFactory.Invoke(xElement))).Cast <T>());
}
return(Enumerable.Empty <T>());
}