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//
// OrderedEnumerableRowCollection.cs
//
// Author:
// Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2008 Novell, Inc. http://www.novell.com
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Generic;
namespace System.Data
{
public sealed class OrderedEnumerableRowCollection<TRow>
: EnumerableRowCollection<TRow>
{
internal static OrderedEnumerableRowCollection<TRow> Create<TRow, TKey> (IEnumerable<TRow> source, Func<TRow, TKey> keySelector, IComparer<TKey> comparer, bool descending)
{
var sorter = new SortComparer<TRow> ();
sorter.AddSort<TKey> (keySelector, comparer, descending);
return new OrderedEnumerableRowCollection<TRow> (new SortedEnumerable <TRow> (source, sorter));
}
internal static OrderedEnumerableRowCollection<TRow> AddSort<TRow, TKey> (OrderedEnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector, IComparer<TKey> comparer, bool descending)
{
source.source.Sorter.AddSort<TKey> (keySelector, comparer, descending);
return source;
}
OrderedEnumerableRowCollection (SortedEnumerable<TRow> source)
: base (source)
{
this.source = source;
}
SortedEnumerable<TRow> source;
}
class SortComparer<TRow> : IComparer<TRow>
{
public SortComparer ()
{
}
new List<Comparison<TRow>> comparers = new List<Comparison<TRow>> ();
public void AddSort (Comparison<TRow> comparer)
{
comparers.Add (comparer);
}
public void AddSort<TKey> (Func<TRow, TKey> keySelector, IComparer<TKey> comparer, bool descending)
{
if (keySelector == null)
throw new ArgumentNullException ("keySelector");
if (comparer == null)
comparer = Comparer<TKey>.Default;
comparers.Add (delegate (TRow r1, TRow r2) {
int ret = comparer.Compare (keySelector (r1), keySelector (r2));
return descending ? -ret : ret;
});
}
public int Compare (TRow r1, TRow r2)
{
foreach (var c in comparers) {
int ret = c (r1, r2);
if (ret != 0)
return ret;
}
return 0;
}
}
class SortedEnumerable<TRow> : IEnumerable<TRow>
{
IEnumerable<TRow> source;
SortComparer<TRow> sorter;
public SortedEnumerable (IEnumerable<TRow> source, SortComparer<TRow> sorter)
{
this.source = source;
this.sorter = sorter;
}
public SortComparer<TRow> Sorter {
get { return sorter; }
}
public IEnumerator<TRow> GetEnumerator ()
{
var list = new List<TRow> ();
foreach (TRow row in source)
list.Add (row);
list.Sort (sorter);
for (int i = 0, c = list.Count; i < c; i++)
yield return list [i];
}
IEnumerator IEnumerable.GetEnumerator ()
{
return GetEnumerator ();
}
}
}
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