[nhibernate-issues] [JIRA] Commented: (NH-11) How to do Sorted Collections

[NHibernate J. <mik...@us...>]

     [ http://jira.nhibernate.org/browse/NH-11?page=comments#action_14680 ]
     
Jerry Haltom commented on NH-11:
--------------------------------

Iesi.Collections.Generic.SortedSet appears to exist now. Perhaps this is a better solution now?

> How to do Sorted Collections
> ----------------------------
>
>          Key: NH-11
>          URL: http://jira.nhibernate.org/browse/NH-11
>      Project: NHibernate
>         Type: Task
>     Reporter: Mike Doerfler
>     Assignee: Mike Doerfler
>      Fix For: prealpha

>
> .NET has no interface for a SortedSet (it has no Set interface, but that is a seperate gripe), or a SortedDictionary.
> There is a SortedList, but the definition of a <list> in NHibernate requires an Index column so it defines the order of the items in the List.
> There is a ListDictionary, but that has warnings about performance being better than Dictionary for only up to 10 items.  The order of a ListDictionary is based on order of Add or using the AddAt().  It does not use a Comparer to determine where to Add an element.
> The options I can see us having is to:
> 1 - Use an external library that provides SortedSet/SortedDictionary functionallity similar to Javas.  I want to stay as close to the .NET SDK as possible since that is what we are using :)
> 2 - Change the meaning of <sorted-set> and <sorted-map> to just be sorted by Add order or AddAt.  That would be more consistent with the .NET SDK and that is the way I am leaning.  
> The Comparer provided in the mapping would be used to determine the order to Add items from the DataReader to the collection.  We could store the objects in a temporary ArrayList while we read from the DataReader and instantiate the objects, then use ArrayList.Sort(IComparer) and iterate through the sorted Array List and Add them to the Set/Dictionary.  
> The preferred way would to be to sort them using the order-by mapping attribute because the db would handle the sorting and give us the items in order.

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