ImprovedNamingStrategy.cs

using System.Text;
using NHibernate.Util;

namespace NHibernate.Cfg
{
	/// <summary>
	/// Summary description for ImprovedNamingStrategy.
	/// </summary>
	public class ImprovedNamingStrategy : INamingStrategy
	{
		/// <summary>
		/// The singleton instance
		/// </summary>
		public static readonly INamingStrategy Instance = new ImprovedNamingStrategy();

		private ImprovedNamingStrategy()
		{
		}

		#region INamingStrategy Members

		/// <summary>
		/// Return the unqualified class name, mixed case converted to underscores
		/// </summary>
		/// <param name="className"></param>
		/// <returns></returns>
		public string ClassToTableName(string className)
		{
			return AddUnderscores(StringHelper.Unqualify(className));
		}

		/// <summary>
		/// Return the full property path with underscore separators, mixed case converted to underscores
		/// </summary>
		/// <param name="propertyName"></param>
		/// <returns></returns>
		public string PropertyToColumnName(string propertyName)
		{
			return AddUnderscores(StringHelper.Unqualify(propertyName));
		}

		/// <summary>
		/// Convert mixed case to underscores
		/// </summary>
		/// <param name="tableName"></param>
		/// <returns></returns>
		public string TableName(string tableName)
		{
			return AddUnderscores(tableName);
		}

		/// <summary>
		/// Convert mixed case to underscores
		/// </summary>
		/// <param name="columnName"></param>
		/// <returns></returns>
		public string ColumnName(string columnName)
		{
			return AddUnderscores(columnName);
		}

		/// <summary>
		/// Return the full property path prefixed by the unqualified class name, with underscore separators, mixed case converted to underscores
		/// </summary>
		/// <param name="className"></param>
		/// <param name="propertyName"></param>
		/// <returns></returns>
		public string PropertyToTableName(string className, string propertyName)
		{
			return AddUnderscores(StringHelper.Unqualify(propertyName));
		}

		public string LogicalColumnName(string columnName, string propertyName)
		{
			return StringHelper.IsNotEmpty(columnName) ? columnName : StringHelper.Unqualify(propertyName);
		}

		#endregion

		private string AddUnderscores(string name)
		{
			char[] chars = name.Replace('.', '_').ToCharArray();
			StringBuilder buf = new StringBuilder(chars.Length);

			char prev = 'A';
			foreach (char c in chars)
			{
				if (c != '_' && char.IsUpper(c) && !char.IsUpper(prev))
				{
					buf.Append('_');
				}
				buf.Append(char.ToLowerInvariant(c));
				prev = c;
			}

			return buf.ToString();
		}
	}
}