Repository/RepositoryVersioned.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Linq.Expressions;

using ComLib;
using ComLib.Entities;
using ComLib.Data;



namespace ComLib.Entities
{
    /// <summary>
    /// Repository that versions the Entities on updates.
    /// </summary>
    /// <remarks>
    /// This works via the following:
    /// 1. Decorates any existing Repository you want to use.
    /// 2. The entity T of the repository must implement IEntityVersionable
    /// 3. The Update method will create a new version of the entity without changing it's primary key.
    /// 4. The VersionRefId of historic/older versions becomes the reference to the primary key.
    ///    and the historic/older versions have a different primary key.
    /// </remarks>
    /// <typeparam name="T">Type of items to store.</typeparam>
    public class RepositoryVersioned<T> : RepositoryBase<T>, IRepositoryVersionable<T> where T : class, IEntity
    {
        /// <summary>
        /// Repository of items.
        /// </summary>
        protected IRepository<T> _repo;


        /// <summary>
        /// Versioned flag.
        /// </summary>
        protected bool _isVersioned;


        /// <summary>
        /// Strict versioned flag.
        /// </summary>