Transformalizing NorthWind

#region License

// /*
// Transformalize - Replicate, Transform, and Denormalize Your Data...
// Copyright (C) 2013 Dale Newman
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
// */

#endregion

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace Transformalize.Extensions
{
    public static class LinqExtensions
    {
        public static IEnumerable<IEnumerable<T>> Partition<T>(this IEnumerable<T> source, int size)
        {
            T[] array = null;
            var count = 0;
            foreach (var item in source)
            {
                if (array == null)
                {
                    array = new T[size];
                }
                array[count] = item;
                count++;
                if (count == size)
                {
                    yield return new ReadOnlyCollection<T>(array);
                    array = null;
                    count = 0;
                }
            }
            if (array != null)
            {
                Array.Resize(ref array, count);
                yield return new ReadOnlyCollection<T>(array);
            }
        }
    }
}