public ReportBuilder(Page page, VwbQuery query)
{
_page = page;
_query = query.Clone();
IEnumerable <string> immutableColKeys = ColumnFactory.ImmutableColumns.Select(i => i.Key());
if (_query.SortColumnKey != null && !_query.ColumnKeysInOrder.Contains(_query.SortColumnKey) &&
!immutableColKeys.Contains(_query.SortColumnKey))
{
_query.SortColumnKey = null;
}
if (string.IsNullOrEmpty(_query.SortColumnKey))
{ //if no sort defined, sort by article number
_query.SortColumnKey = ColumnFactory.GetArticleNumberColumn().Key();
}
}