EntityTableDataLoaderFactory.cs

// --------------------------------------------------------------------------------------------
// <copyright file="EntityTableDataLoaderFactory.cs" company="Effort Team">
//     Copyright (C) Effort Team
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namespace Effort.DataLoaders
{
    using System;
#if !EFOLD
    using System.Data.Entity.Core.EntityClient;
    using Effort.Internal;
    using System.Reflection;
#else
    using System.Data.EntityClient;
#endif

    /// <summary>
    ///     Represents a table data loader factory that creates 
    ///     <see cref="EntityTableDataLoader" /> instances for tables.
    /// </summary>
    public class EntityTableDataLoaderFactory : ITableDataLoaderFactory
    {
        private Func<EntityConnection> connectionFactory;
        private EntityConnection connection;
        
        

        /// <summary>
        ///     Initializes a new instance of the <see cref="EntityTableDataLoaderFactory" /> 
        ///     class.
        /// </summary>
        /// <param name="connectionFactory">
        ///     A delegate that creates a connection towards the appropriate database.
        /// </param>
        public EntityTableDataLoaderFactory(Func<EntityConnection> connectionFactory)
        {
#if !EFOLD
            var entityConnectionString_Fields = connectionFactory.Target.GetType().GetField("entityConnectionString", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);

            var entityConnectionString = entityConnectionString_Fields.GetValue(connectionFactory.Target);

            if (entityConnectionString.Equals(""))
            {
                this.connectionFactory = () => EntityFrameworkEffortManager.CreateFactoryContext(null).Database.GetEntityConnection();
            }
            else
            {
                this.connectionFactory = connectionFactory;
            }
#else
            this.connectionFactory = connectionFactory;
#endif
        }

        /// <summary>
        ///     Ensures that a connection is established towards to appropriate database and 
        ///     creates a <see cref="EntityTableDataLoader" /> instance for the specified
        ///     table.
        /// </summary>
        /// <param name="table"> 
        ///     The metadata of the table.
        /// </param>
        /// <returns>
        ///     The <see cref="EntityTableDataLoader" /> instance for the table.
        /// </returns>
        public ITableDataLoader CreateTableDataLoader(TableDescription table)
        {
            if (this.connection == null)
            {
                this.connection = this.connectionFactory.Invoke();
                this.connection.Open();
            }

            return new EntityTableDataLoader(this.connection, table);
        }

        /// <summary>
        ///     Disposes the connection established towards the database.
        /// </summary>
        public void Dispose()
        {
            if (this.connection != null)
            {
                this.connection.Close();
                this.connection.Dispose();
            }
        }
    }
}