Repository/IRepository.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;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Linq.Expressions;
using System.Data;

using ComLib;
using ComLib.Data;


namespace ComLib.Entities
{    
    /// <summary>
    /// Interface for a Repository pattern to support CRUD and Find operations on some underlying datastore(sql database).
    /// </summary>
    /// <typeparam name="T">Type of entities.</typeparam>
    public interface IRepository<T> : IRepositoryQueryable, IRepositoryConfigurable
    {

        #region CRUD - Create, Get, Update, Delete
        /// <summary>
        /// Create an entity.
        /// </summary>
        /// <param name="entity">Instance of entity.</param>
        /// <returns>Created entity.</returns>
        T Create(T entity);


        /// <summary>
        /// Create a list of entities.
        /// </summary>
        /// <param name="entities">List of entities.</param>
        void Create(IList<T> entities);


        /// <summary>
        /// Creates the entity conditionally based on whether they exists in the datastore.
        /// Existance in the datastore is done by finding any entities w/ matching values for the 
        /// <paramref name="checkFields"/> supplied.
        /// </summary>
        /// <param name="entity">Entity to create.</param>
        /// <param name="checkFields">Matching filters.</param>
        void Create(T entity, params Expression<Func<T, object>>[] checkFields);