Building a Middle Tier Component using NHibernate and Spring.NET

using System;
using System.Collections;
using Spring.Orm.Hibernate.Support;

namespace SpringClient.Utility.Product
{
	/// <summary>
	/// The Implementation of the IUProductDAO.
	/// 
	/// This is a concrete Data Access Object for the Product object.
	/// 
	/// Implemented all the methods remains in <see cref="SpringClient.Utility.Product.IUProduct"/> DAO interface.
	/// 
	/// Inherited from <see cref="Spring.Orm.Hibernate.Support.HibernateDaoSupport"/> for
	/// the Data Acccess support provided by the Hibernate ORM.
	/// 
	/// <author> Moim Hossain</author>
	/// </summary>
	public class UProductDAO : HibernateDaoSupport, IUProductDAO
	{
		/// <summary>
		/// Constructor
		/// </summary>
		public UProductDAO()
		{
		}

		#region IUProductDAO Members
		/// <summary>
		/// Create a Product. 
		/// </summary>
		/// <param name="Product">The Product That will be Persisted</param>
		/// <returns>The Product The has saved to the Data Store. Contains the ID (Generated by datastore)</returns>
		public UProductDTO Create(UProductDTO Product)
		{
			HibernateTemplate.Save( Product ) ;

			return Product;
		}
		/// <summary>
		/// Retrive a Product from the Data Store by ID
		/// </summary>
		/// <param name="ProductID">The ID that will be searched into the Data store</param>
		/// <returns>The Retrived Data Object</returns>
		public UProductDTO Retrive( long ProductID )
		{
			return HibernateTemplate.Load( typeof( UProductDTO ) , ProductID ) as UProductDTO;
		}
		/// <summary>
		/// Update a product Object
		/// </summary>
		/// <param name="Product">The Product Instance that should be Updated</param>
		public void Update( UProductDTO Product )
		{
			HibernateTemplate.Update( Product );
		}
		/// <summary>
		/// Deletes a product
		/// </summary>
		/// <param name="Product">The product that will be Deleted</param>
		public void Delete( UProductDTO Product )
		{
			HibernateTemplate.Delete( Product );
		}
		/// <summary>
		/// Search for some object by matching a criteria
		/// </summary>
		/// <param name="queryString">The Hibernate Query string</param>
		/// <param name="Parameters">The parameter values for the query</param>
		/// <returns>The List of UProducts that has a match for the given query</returns>
		public UProductDTO[]FindProducts( string queryString , object[]Parameters )
		{
			IList resultList = HibernateTemplate.Find( queryString , Parameters ) as IList;

			if( null != resultList )
			{
				UProductDTO[]products = new UProductDTO[resultList.Count];

				resultList.CopyTo( products , 0 );

				return products;
			}
			return null;
		}
		#endregion
	}
}